The email that arrives eleven weeks late
The quotation went out on a Tuesday in March. Nothing came back. You chased once, got a polite line about the loft still being discussed with the wife's brother, and wrote the job off the way you write off two out of every three. Then, in the first week of June: sorry for the delay, we would like to go ahead, can you start in three weeks. The number at the bottom of that March document rests on a merchant quotation for structural timber that expired in April, six of your own days costed at winter rates, and a plasterer who has since put his day rate up.
There are three moves available and two of them are bad. Honour it and you have bought the customer a discount you never agreed to, on a job you will resent for the whole six weeks it runs. Withdraw it flatly and you have lost the work, and depending on what the document said you may have withdrawn something you no longer had the right to withdraw. The third move is to open your own quotation and find out what it actually said about this exact situation — and whether it said anything at all, which is the usual answer.
Almost nothing about those eleven weeks was under your control. What the document said was entirely under your control, for about twenty minutes, on a Tuesday in March. This page is about those twenty minutes: the word at the top, the dates, what a silence in your own drafting commits you to, and whose terms are running once somebody starts. How the total itself was assembled — the year's overhead, the divisor, the recovery on an hour of somebody else's time — is a different division and it is worked through on the page about pricing your own work.
One of these words is an offer and the other one is an opinion
In ordinary trade use an estimate is your considered opinion of what work will probably cost, and a quotation is an offer to do defined work for a defined sum. That is not a difference of tone. An offer is capable of being accepted, and acceptance closes the contract at that number without any further act from you: no signature, no confirmation, no second thought. The Restatement (Second) of Contracts puts the test plainly at section 24 — a manifestation of willingness to enter a bargain, so made that the other person is justified in understanding that their assent will conclude it. Every clause of that sentence is under your control while you type.
The header does not settle which one you sent. A document titled Estimate that carries a single fixed total, a start date and a validity period reads as an offer to anybody who receives it, and it will be treated as one. A document titled Quotation with six lines marked TBC has not offered anything definite enough to accept, whatever it calls itself. What actually decides it is whether the reader can say yes and know exactly what they have bought. If they can, you have made an offer; the word at the top is a label on the outside of the box.
So if you mean an estimate, write one properly rather than writing a quotation and hedging it with the word approximately. An honest estimate states its basis of calculation: the rate, the assumed quantity, the assumed duration, and what gets measured on completion. That is also what the law asks for where a price genuinely cannot be fixed in advance. The information a trader must give before an off-premises consumer contract — the kitchen table, where most domestic work is agreed — is listed in Schedule 2 to the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013, and it includes the total price inclusive of taxes or, where that cannot reasonably be calculated in advance, the manner in which the price is to be calculated. Around eight, give or take, is neither.
Getting it wrong is asymmetric and it lands on you both ways. Perform under a document that turns out not to have been a fixed price and you are entitled to a reasonable price — section 51 of the Consumer Rights Act 2015 supplies one where none was agreed — which in practice means an argument you fund out of working capital while it runs. Perform under one that turns out to have been a fixed price when you thought you were sketching a figure, and the number is simply the number. The second happens far more often, because a hedged quotation still looks exactly like a price to somebody reading it in their own kitchen.
| The document you send | What it commits you to | What decides it, if anyone ever asks |
|---|---|---|
| Defined work, one sum, a stated date it lapses | All of it, at that number, from the moment the client accepts — no further act of yours is required | General contract law rather than any construction standard: it is an offer if a reasonable reader would understand that their yes concludes the bargain |
| A stated basis of calculation, remeasured at the end | The basis, not the total — the rate, the assumed quantity, and what gets measured on completion | Whether the basis is actually written down. An estimate with no stated basis is a quotation with a disclaimer stapled to it |
| A figure given over the phone or across the bonnet | Nothing on paper, and everything in the client's memory of the conversation | Nothing on your side helps; where it later matters, a reasonable price is implied under section 51 of the Consumer Rights Act 2015 |
| Most lines priced, a few left to be confirmed | The priced lines, with the rest argued about once you are on site and least able to walk away | Definiteness. A term the two of you never fixed is not made fixed by sitting on the same page as terms you did |
What you did not say, you have agreed to
There is an old drafting principle that ambiguity is read against whoever wrote the words, and for consumer work in the United Kingdom it is no longer a principle, it is a section. Section 69 of the Consumer Rights Act 2015 says that if a term in a consumer contract could have different meanings, the meaning most favourable to the consumer prevails. You are the drafter. Every ambiguity you leave is resolved against you by statute, without the client having to prove you meant it the generous way. That sentence should shape the scope page more than any commercial consideration on it.
A scope line needs four things: a verb, an object, an extent and a standard. Plastering is not a line. Skim in two coats to the four walls and ceiling of the rear reception, twenty-four square metres measured net of the new opening, ready for decoration by others, is a line. The extent is the part habitually left out and it decides whether the hallway is an extra or a favour. Quantities carry their own trap, because the figure you priced is a net measure and the figure you ordered carries a waste allowance on top of it; put the net measure on the quotation and keep the ordering quantity on your own sheet, or you have quietly told the client they are buying offcuts.
Supply and fix against fix only is the single most common ambiguity in domestic quotations, precisely because the trade says supply and fit so automatically that it stops getting written. If the client is buying the tiles, say so on the tiling line. Then say what you have assumed about breakage and shortfall, and who goes back to the showroom when the batch runs out three square metres short on a Friday afternoon. That last sentence costs nothing to write and settles an argument that otherwise happens at the worst possible moment in the job.
The exclusion and the assumption are two different instruments and a good quotation carries both. An exclusion says a thing is not in the price and not your responsibility. An assumption says the price was built on a stated state of affairs, and that if the state of affairs is different, the difference is a variation. On refurbishment the second is far more useful, because most of what worries an experienced estimator is not something he can decline — it is something whose extent nobody can see yet. Allowances, provisional sums and prime cost sums are a third instrument again, defined for measured work in RICS New Rules of Measurement 2, and how a buyer reads all three is covered on the quote-comparison page. What belongs here is only the choice between the two you write yourself.
One last thing about silence: there is no such thing as an implied inclusion in your favour, and there are implied terms running against you whatever the document says — section 49 of the Consumer Rights Act 2015 requires reasonable care and skill, and section 57 makes that particular term one you cannot exclude or restrict, so no wording of yours displaces it. Nor does burying a term help, because section 68 requires written terms to be transparent. Small print buys the same words, read less kindly.
- Open with a verb that describes an operation, not a noun that names a trade. Somebody has to be able to tell from the line whether it has been done.
- State the extent as a measured quantity with its unit, and name the sheet and revision letter it came off.
- Name the standard or finish the line ends at, and say who picks the work up from there.
- Say who supplies the material, and what happens if it runs short or arrives damaged.
- Put the net measured quantity on the quotation and keep the waste-loaded ordering quantity on your own take-off sheet.
- Read the line back as an opponent would. If a stranger finds a second meaning, that is the meaning that applies to you.
The percentage you print is the one every extra gets priced at
Two quotations can carry the same total and be entirely different documents. One shows a single figure. The other shows a cost subtotal with a stated overhead and profit percentage on top. Everyone knows the argument against showing it: you have handed the client the only line they believe they understand, and it is the line they will attack. True, and not the whole trade-off, because the percentage you print is also the rate that governs every change to the job for the next six months.
The standard forms are explicit about this in a way domestic paperwork never is. The NEC4 Engineering and Construction Contract asks the contractor to enter a fee percentage in the Contract Data, and applies that percentage to Defined Cost whenever a compensation event is assessed: the number written to win the job is the number that prices every change on it. AIA Document A201 handles changes at Article 7, where a directed change is built up from cost with an allowance for overhead and profit — a phrase that has to mean something specific by the time somebody needs it. On a domestic quotation with no standard form behind it, if the document names no rate for varied work, the rate is whatever the two of you can agree on the afternoon a drain appears where the foundation goes, and only one of you is standing in the trench.
There is also an arithmetic reason not to print one number when you mean two. A blended percentage averages two different recoveries. The material side carries buying time, storage, delivery, breakage and the weeks you are out of pocket while the merchant account runs; the labour side carries supervision, non-productive hours and insurance loaded by trade classification. Those are rarely equal, and the material-to-labour ratio of the job you quoted is not the ratio of the variation somebody asks for in week four. A change that is almost all material, valued at the blended rate you printed, under-recovers the material side and over-recovers a labour cost that is not there. That is an argument for printing two rates, not for hiding one.
Which suggests a middle position that most small firms arrive at eventually. Keep the percentage off the price page, where it is a target for negotiation, and put it in the terms, where it is a mechanism: varied work valued at cost plus a stated percentage on materials and a stated percentage on labour, instructed in writing before it is carried out. The client who wants to argue about the total argues about the total. The number that will govern the next six months goes in unread, which is exactly where you want it, and it is still written down when you need it.
Run the job as quoted, then run a plausible variation through it twice at the same single percentage — once materials-heavy, once labour-heavy. The gap between what that blended rate recovers and what each of those actually costs you is the case for printing two numbers in the terms instead of one on the price page.
Your direct cost for materials on this job.
Your direct labor cost for this job (wages, not billed rate).
The percentage added on top of costs to cover overhead and profit.
Total price to charge
$9,600
- Cost subtotal
- $8,000
- Markup amount
- $1,600
- Gross margin on the price
- 16.67 %
They open the calculator with your figures already in it
Contractor Markup Calculator: 9,600 $ (total price to charge) — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
What this calculation does not cover
- Only two cost lines feed the subtotal — materials and labor. Permits, equipment and tool rental, dumpster and disposal fees, subcontractor invoices, insurance, fuel and supervision are not inputs, so anything you have not already buried inside those two figures is neither marked up nor billed.
- Materials and labor are marked up at one identical rate, because the percentage is applied once to their combined subtotal. If you price material at one percentage and labor at another — a common split — price the two separately and add the results, since a single blended figure here will not reproduce that.
- The markup amount in the breakdown is gross, not profit: it is the one figure that has to carry overhead and profit together, and there is no overhead input to separate them. Office costs, vehicles, estimating time and idle days come out of that same amount before anything is left over.
- The gross margin row is the same money expressed against the price instead of against the cost, and it is always the smaller percentage of the two — a 20 per cent markup is a 16.7 per cent margin. It is shown because the two are routinely used interchangeably and are not equal; it is still gross, so overhead has not been taken out of it, and it is not a net profit figure.
- Nothing is added after the markup — the total is exactly the subtotal multiplied by one plus your percentage. Sales tax, VAT or GST, permit fees passed through to the client, and card or financing charges all sit outside it, so the number is a price to quote rather than a finished invoice.
- The costs you enter are treated as final and already known. There is no waste allowance and no contingency term, so if supplier prices move between quote and purchase or the hours run long, the overrun comes out of the markup instead of being added to the price.
- Each cost line accepts up to 500,000 and the markup up to 200 per cent, which caps how large a single job this will price without splitting it. The currency is a label only: the answer comes back in whatever currency you typed the costs in, with no conversion and no rounding to a tidy quotable figure.
How long you are giving the price away for
Valid for thirty days is a promise, and it has a price nobody works out. What you have sold, for nothing, is an option: the client can watch the market for a month and take the deal only if it still suits them. That is a perfectly reasonable thing to sell. It is not a reasonable thing to give away without knowing what it is worth, and the way to find out is to price the exposure rather than to copy the period off the last document you sent.
The window that matters is not the one printed on the page. It is the gap between the day the merchant struck the prices behind your total and the day you can place an order that fixes them: validity, plus the client's decision lag, plus whatever has to happen before you can commit — a site survey, a deposit clearing, a structural detail signed off. Quote thirty days on a job needing fabricated steel and you have not exposed yourself for thirty days; you have exposed yourself for thirty plus the four weeks between acceptance and the fabricator's drawing coming back approved.
How long an offer survives is worth knowing in outline, because two exceptions catch trade quotations specifically. The general position is that an offer can be revoked any time before acceptance — the Restatement (Second) of Contracts covers revocation at sections 42 and 43 and the option contract that prevents it at section 25 — and that one with no stated period lapses after a reasonable time, which section 41 leaves to circumstances rather than a number. The first exception is section 2-205 of the Uniform Commercial Code: a merchant's signed written offer for goods giving assurance it will be held open is irrevocable for the period it states, without consideration, and never for more than three months — though Article 2 reaches goods, so a supply-and-fix quotation is sorted by whichever purpose predominates. The second is reliance, where section 87(2) of the Restatement binds an offer as an option because the offeror should have expected it to induce substantial action and it did — exactly a subcontractor's price carried into a main contractor's tender. The same document sent to a homeowner and to a main contractor does not carry the same exposure, and nothing on its face says so.
So write the period, and write that the offer lapses automatically rather than running on until you get round to withdrawing it. Then do the part with teeth: tie the material lines to the supplier quotations they were built from, by reference and date, attached. A domestic client cannot usefully be handed a general escalation clause — a term letting the trader raise the price after the contract without a corresponding way out for the consumer is among those Schedule 2 to the Consumer Rights Act 2015 flags as potentially unfair; what a supplier re-quote moves besides the number is worked through on the variation-pricing page. Between businesses there are drafted answers worth naming: the JCT fluctuations provisions, running from tax changes only through labour and materials cost to formula adjustment against the Price Adjustment Formulae Indices; secondary Option X1 of NEC4; and ConsensusDocs 200.1, which exists for nothing else.
The sum that decides the period is one line long. Take the material content of the quotation, assume a rate of change you can defend from a published series rather than from a feeling — Producer Price Index commodity data for construction materials in the United States, the Department for Business and Trade's monthly building materials indices in the United Kingdom — and run it over validity plus procurement. If the answer is a rounding error, quote sixty days and let the client take their time, which costs nothing and reads as confidence. If it is a week's wages, quote fourteen and say on the document why. Thirty because the last one said thirty is not a decision at all.
| The date | What it governs | What its absence costs you |
|---|---|---|
| The day the prices behind the total were struck | The total describes that day's rates and no other day's; it is the anchor everything later is measured from | No way to demonstrate, in June, that the market moved rather than that you did |
| The day the document was sent | Starts the client's decision clock, and on an off-premises consumer contract is the point by which the prescribed information must have been given | An argument about when the fourteen days started, on top of an argument about the price |
| The day the offer lapses | The end of the client's power to accept. After it, a yes is a fresh offer from them, which you may accept, decline or re-price | An offer that runs until somebody remembers to withdraw it, and a client who has read the silence as consent |
| The earliest day an order can actually be placed | The real end of your exposure, where a supplier price stops being quoted and becomes bought | A validity period chosen against the wrong window, which is why thirty days so often turns out to have been sixty |
Put the material content of the quotation in as the original price and the months as validity plus procurement, not validity alone. Use a rate you can point at a published index for. What comes out is the cost of the promise you are about to print at the bottom of the page.
The price from an old quote or estimate.
How many months have passed since the quote was given.
Your assumed yearly rate of change for this material category.
Estimated current price
$10,512
This assumes a steady compounding rate, but real material prices (especially lumber, steel, and copper) often move in sharp, unpredictable swings rather than smoothly — get a fresh quote for anything time-sensitive.
- Total change
- $511.62
They open the calculator with your figures already in it
Material Price Escalation Calculator: 10,512 $ (estimated current price) — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
What this calculation does not cover
- Months Since Quote is held between 1 and 120 and an out-of-range entry is clamped to the nearer end when you leave the box, so a quote three weeks old has to be pushed up to a full month and one eleven years old is escalated as though only ten years had passed.
- The rate field accepts nothing below -20% or above 50% a year and the original price stops at $1,000,000, so a timber line that doubled since it was priced, or a seven-figure supply package, has to be broken into stages or separate runs before the figures will go in.
- Two numbers come back and no more, the escalated price and the dollar difference from the original, with no month-by-month schedule underneath, so there is nothing showing how much of the rise accumulated in the first year against the last.
- The old price is simply multiplied out, with no currency term anywhere in the arithmetic, so a quote issued in another currency carries whatever the exchange rate has done since it was written entirely outside this answer.
- Nothing separates months already gone from months still ahead of you, because the figure you type is used only as an exponent, so escalating to a delivery date some way off means adding that lead time into the months yourself.
The contingency you are not allowed to show
On a lump sum, whatever you carry for risk is inside the price, invisible, and it is not the client's money — it is yours, already committed to events that may never happen. There are exactly three places it can go on the page, and each of them costs something different.
Shown as its own line, it is the first thing negotiated away: the one entry a client feels qualified to challenge and the only one that appears to buy nothing. Distributed silently into the rates, it survives the negotiation and destroys your own feedback — the job finishes in profit and you cannot tell whether that is because it was priced well or because the floor turned out sound, so the next quotation is built on a lesson nobody learned. Converted into a written assumption, it costs nothing and the client has read it.
That third move is worth practising, because most of what a builder wants a contingency for is not an unknown cost, it is an unknown extent. Write it as a condition of the price. Priced on the basis that the existing joists are sound and at the centres measured in the two bays lifted at survey. That the consumer unit has spare ways for the new circuits. That the wall behind the render is masonry rather than timber frame. Each of those, printed on the price page, converts money you would otherwise carry into a variation trigger the client has seen and accepted before signing. It does not make the risk go away. It returns it to the person who has owned the building for nine years.
There is a limit to the move, worth naming before somebody overuses it. An assumption about something the client can see, verify or accept is legitimate. An assumption about something only you could have checked, and did not, is a disguised exclusion and will be read as one when it matters. And a quotation composed mostly of conditions has stopped being a price: a reader who counts nine assumptions sees a list of ways out rather than an offer, and goes to the firm whose document made fewer. What survives every assumption you can honestly write is the residue, and the residue — not the contract sum — is what a contingency is sized against. Building that figure from a register of named unknowns is worked through on the renovation-budget page.
Enter the residue as the base, not the contract sum: what is left exposed once every assumption you can defend is written on the price page. Then see what one point either way is worth in money, because that is what an hour spent lifting two floorboards before you send the quotation is actually buying you.
Your planned budget before adding a buffer for the unexpected.
The extra buffer to add for unexpected issues.
Total budget with contingency
$23,000
Contingency is a planning buffer, not a guarantee — projects that uncover major surprises (structural damage, code-required upgrades) can still exceed even a generous contingency.
- Contingency amount
- $3,000
They open the calculator with your figures already in it
Project Contingency Calculator: 23,000 $ (total recommended budget) — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
What this calculation does not cover
- The percentage is applied to the base budget as one flat multiplier, so every dollar of the job is treated as carrying identical risk. A $20,000 kitchen made up of $14,000 of fixed-price cabinetry already on order and $6,000 of demolition into an unknown wall gets the same $3,000 buffer at 15% as one that is speculative end to end. Where the risk sits in a single part of the scope, size a buffer against that part and add it to the rest rather than smearing one rate across the total.
- Nothing in the arithmetic is a fixed amount: the buffer is purely proportional, so it shrinks with the budget while many of the surprises it is meant to absorb do not. A failed inspection, half a day of extra excavation or an emergency call-out costs roughly the same on a $3,000 job as on a $300,000 one, yet 15% sets aside $450 on the first and $45,000 on the second. Small jobs are the ones a percentage rule quietly under-buffers.
- Whatever is missing from the base figure stays missing from the answer. The base budget is read as a single opaque number, so if permits, disposal, delivery charges or temporary accommodation were never counted in it, a 15% buffer on that total does not fund them — it scales an incomplete estimate rather than completing it.
- The output is a lump sum with no timing in it. No term asks when the money is drawn or how long ago the base was priced, so a buffer taken on a year-old estimate is a percentage of a stale number. Re-running the figure part-way through a job would need the remaining scope and the buffer already consumed, and neither is tracked here.
- The percent field accepts whole numbers from 5 to 50 and the base accepts $100 to $2,000,000; those are input bounds, not guidance about where your job belongs. The commonly cited 10-20% range is a general renovation figure, and nothing in the calculation weighs building age, how much structural work is involved, or how firm your quotes are to place you within it.
Whose terms, when both of you sent some
Your quotation has terms on it. If the client is a business, the order that comes back has terms too, and the two are almost never compatible. Which set governs is decided by sequence rather than merit: at common law an acceptance that varies the offer is a counter-offer, and performance without objection accepts whatever document was last put on the table — the last shot. For goods the Uniform Commercial Code breaks that deliberately at section 2-207, where a definite expression of acceptance operates as one even while stating additional terms, and between merchants those terms join the contract unless the offer limited acceptance to its own, they materially alter it, or objection has already been given.
The practical consequence for a small firm is short and unwelcome. Turning up is acceptance. The commonest way a subcontractor ends up working under a main contractor's conditions — a payment period nobody agreed, a set-off clause nobody read, a retention nobody priced — is by receiving an order that says so on the second page and starting on the Monday. If the order that comes back differs from the quotation that went out, the objection has to be in writing and it has to be before anyone starts, which means somebody has to read the thing that week rather than putting it in the job folder.
Incorporation has its own timing rule and it catches people who did everything else right. A term is only in the contract if the other side had a fair opportunity to see it before they accepted. Conditions on the back of the invoice are too late by weeks. A link in the covering email is usually early enough, but it leaves you to prove what the page said that day. Reference the terms on the face of the quotation, above the signature block, in the same file, and keep the exact version that went out as a dated document of your own — because in two years the argument will be about which version applied, and a live web page edited since proves nothing.
What has to be legible on the face of it
Start with identity, because a sole trader and a limited company are different defendants and a trading name is neither. Where the work is done through a company, the quotation is an order form and a business letter for the trading disclosure rules made under section 82 of the Companies Act 2006: the registered name, the part of the United Kingdom it is registered in, the registered number and the registered office all belong on it. Read that as red tape if you like, but its commercial point is its legal one — the reader is entitled to know who they are contracting with, and a document carrying a trading name and a mobile number leaves that open in the direction that suits nobody honest.
The rest is a checklist, and the discipline is that it fits on the face of the document rather than in an appendix nobody opens. One point is easy to get wrong at the moment of signing: where the contract will be concluded away from your business premises, which is most domestic work, the information required by the 2013 Regulations has to be given on paper or, if the consumer agrees, in another durable medium. An emailed PDF is one. A thorough conversation on the doorstep is not, however honestly conducted. The cancellation rights that follow, and the work the Regulations carve out of them, are covered on the stage-payments page.
- The contracting entity in full, with the company number, place of registration and registered office where it is a company.
- A scope reference and revision, naming the drawings and revision letters the take-off was measured from.
- One total, with the tax position on its face — inclusive, exclusive, or reverse charge where the customer is within the Construction Industry Scheme.
- The date the prices were struck and the date the offer lapses, both printed, neither implied.
- Assumptions and exclusions on the price page, each written as a named thing rather than a category.
- The rate varied work will be valued at, and how it has to be instructed before it is carried out.
- How acceptance is to be given and by when — signed and returned, or an order quoting this document's number and revision.
Send it, then do the one thing almost nobody does
Keep the exact file that went out, dated, in the job folder rather than only in the sent items of an email account you will change providers on. Then put the lapse date in your own diary, because the document is in the client's inbox and the diary is the only copy that will interrupt you. Those two habits take a minute between them and they are what turns the wording of the last five sections into something that actually operates.
When the acceptance arrives eleven weeks late, the answer is neither of the two obvious ones. Re-issue: the same scope page, the same assumptions, the same exclusions, rebuilt prices, a new date struck and a new lapse date, with a covering line saying plainly that the March quotation lapsed in April and this is the same job repriced. It takes twenty minutes rather than an evening, because the scope page is the part that took the work and none of it has changed. It is also the most persuasive move available, because the client learns that your document meant what it said, which is the whole reason to believe the new one. A firm that quietly honours a lapsed price has taught its customer that the dates on its paperwork are decoration.
None of this makes a quotation more likely to be accepted, and it is worth being honest that some of it makes a document slightly harder to say yes to. What it does is make the price survive being said yes to later. Three months on, the thing that decides whether the figure still stands is not the figure. It is whether both people reading the document still agree on what it was a price for, when it stopped being available, and what happens to it if the floor comes up and the joists are not what anybody said they were.
Settle these in the twenty minutes before it is sent
Most of what breaks a price in the twelve weeks after it goes out was decided, or left undecided, just before it went. Six things to fix while the document is still yours.
- Which document you are actually sending — An offer capable of acceptance, or an opinion with its basis of calculation written out. The header does not decide it; whether a reader can say yes and know what they bought does.
- The extent on every line, in units, off a numbered revision — A verb, an object, a measured quantity and a standard. Section 69 of the Consumer Rights Act 2015 gives every ambiguity you leave to the other side, so the second meaning of a line is the one that applies to you.
- Two dates printed, not one implied — The day the prices were struck and the day the offer lapses — and the period chosen against validity plus procurement, because the exposure ends when an order can be placed, not when the client replies.
- The assumptions that stand in for a contingency you cannot show — Priced on the basis that the joists are sound, that the consumer unit has spare ways, that the wall is masonry. Each one written on the price page converts carried risk into a variation trigger the client has already read.
- The rate varied work will be valued at, in the terms — Off the price page where it invites negotiation, in the terms where it is a mechanism — and split between materials and labour, because a blended percentage misprices whichever way the next change leans.
- Whose conditions govern, settled before anyone starts — If the order that came back differs from the quotation that went out, object in writing that week. Starting work on the Monday is how a firm accepts terms it never read.
Opens the calculators above on one screen with the dimensions from this article already filled in. Quantities only — this site publishes no price list, because local prices vary too much to publish honestly.
