Programme

Two Weeks Gone, and the Completion Date Has Not Moved

A fortnight lost to weather and a late instruction. Which of them buys time, which also buys money, and the notice that has to go before either does.
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Six wet days, an eleven-day wait, and nothing on paper

The dig ran into the back half of February and lost six working days to standing water — not to rain falling, to a formation that would not take plant the morning after it stopped. Separately, the revised setting-out for the steel was needed by the fourth and arrived on the fifteenth, and the frame could not be released against a drawing that was going to change. The job is a fortnight behind, everybody on site agrees it is a fortnight, and the completion date is where it was in December.

That last clause is the whole problem. A completion date does not drift because a job drifts. It moves only when somebody with the power to move it says so in the way the contract requires, and until then every day past it is a day on which damages accrue at the rate the contract fixed. Nobody has to prove you were at fault: liquidated damages are payable on the fact of late completion, which is why they exist at all.

So the fortnight is not one problem. It is two events with different names, different tests, different clocks and — the part that catches most contractors — different outcomes, because one of them will buy you time and nothing else. Writing both up in one letter as delays to date is how a good claim and a weak claim get assessed together at the level of the weak one.

Time and money are two claims and they fail separately

The JCT vocabulary does the sorting if you let it. Relevant Events entitle you to an extension of time; Relevant Matters entitle you to loss and expense. The lists overlap heavily but they are not the same list, and here the weather is what separates them: exceptionally adverse weather conditions sit among the Relevant Events and not among the Relevant Matters. That is the drafter saying the employer will carry the date and you will carry the cost. Six days of standing water may well move your completion date. On an unamended form it will not pay for the six days.

The late setting-out is the other case. Information issued later than it should have been is both — it moves the date and opens the loss and expense door — because its cause lies on the employer's side of the line rather than in the sky. Which is the practical reason to serve two applications rather than one: put them in the same document and a weak weather half drags down the half that was worth money.

The other forms draw the line elsewhere. NEC4's core clause 6 collapses the distinction on purpose: a compensation event is quoted for as a change to the Prices and to the Completion Date in one document, forecast forward and settled while it is happening. AIA Document A201 keeps time in Article 8 but pushes any claim for additional time or money through Article 15, inside a fixed window — twenty-one days in the current General Conditions. FIDIC is hardest of the four: twenty-eight days from when the contractor became aware or should have become aware, drafted so a late notice loses the entitlement. Obrascon Huarte Lain v Attorney General for Gibraltar put that second limb under a microscope, and it reads badly for anyone who waited until they were sure.

The clock started before you noticed it had

Almost every form measures the notice period from awareness, not from measurement, and that is the most expensive misunderstanding in this area. The trigger is the point at which it became reasonably apparent that progress was being, or was likely to be, delayed — not the point at which you finished working out by how much. On the steel, awareness arrived on the fourth, when the drawing did not. Not on the fifteenth when it came, and certainly not in April when erection finally slipped.

Whether lateness is fatal depends on the form and on what has been done to it. The unamended JCT notice is not generally a condition precedent: the assessor's duty is to grant a fair and reasonable extension, and lateness goes to what you can still prove rather than to whether you may ask. FIDIC's is a condition precedent and says so. NEC's eight-week bar is one in effect. And an amendment can turn a permissive JCT notice into a hard bar without using the words — Steria v Sigma Wireless is the authority that clear conditional wording is enough. Read the amendment schedule, not the printed form.

So split what you send. The notice is short, goes out immediately, names the event and the date it arose, and contains no arithmetic. The particulars follow when they exist. Several forms start the assessor's own response deadline from receipt of the particulars rather than from the notice, so a notice with nothing behind it also stops the other side's clock from ever starting.

  1. The event in one sentence, using the contract's own words for it — not "bad weather" but the term the form actually lists.
  2. The date it arose and the date it became apparent that progress would be affected, as two dates, because they are not always the same one.
  3. Which operations on the current programme it affects, named as they appear on that programme.
  4. That particulars and an estimate of the delay will follow, under the clause cited from your own copy rather than from memory.
  5. If money is also being sought, a separate letter, so the two applications can be assessed apart.

Exceptional, or just February

"Exceptionally adverse" is a comparative, and the comparison is not with the weather you hoped for. It is with what the record says that place does at that time of year: six wet days in a February fortnight in the north of England is a normal February, and the same six days in July are not. So it is a records exercise, not an argument. Met Office historic station data, and the MIDAS observations behind it in the CEDA Archive, give daily rainfall and temperature for the nearest usable station going back decades; NOAA's Local Climatological Data is the American equivalent. Pull the same fortnight for twenty years, set yours beside it, and you know before writing whether you have anything.

The NEC weather test is worth borrowing even off NEC, because it is the only common form that defines the comparison instead of leaving it to an adjective. It names a weather measurement place in the Contract Data, names the weather data the measurement is compared against, and asks whether a monthly measurement occurs on average less frequently than once in ten years. The refinement most people miss is what you then get: the entitlement is assessed on the excess over the ten-year value, not on the whole month. A February that beat the ten-year rainfall by a fifth does not buy you February. It buys you the fifth.

Causation is the second half of the test and it fails more claims than the meteorology does. Rain that fell while the gang was inside first-fixing is not delay, and nor is rain on a Saturday you were not working. What counts is weather that stopped or measurably slowed an operation that was critical at the time — which means knowing what was critical that week from an updated programme rather than from recollection. Be honest about consequences, too: six days here went to a formation that would not take plant, which is a ground condition the weather produced, and under some risk allocations that is the stronger route.

What each cause typically buys under the standard unamended forms, and what has to be shown before it buys anything
Cause of delayTimeMoneyWhat has to be shown
Exceptionally adverse weatherUsually yesUsually noRecords for that place and season showing the period was exceptional, and that it stopped critical work
Information or instruction issued lateYesYesThat it was requested in writing, neither unreasonably early nor late
A variation instructed by the employerYesYesThe instruction, and the effect on sequence rather than on quantity
An undefined provisional sum expendedYesYesThat the sum was undefined on the face of the bill
Statutory undertaker's worksUsually yesDepends on the formThe date the connection was applied for, and the utility's own dates
Subcontractor or supplier defaultNoNoNothing available — this sits on your side of the line
What each cause typically buys under the standard unamended forms, and what has to be shown before it buys anything

The drawing you cannot prove you asked for

Late information is the stronger of the two events and the easier to lose on procedure, because the entitlement almost always depends on having asked. The forms put it differently — an information release schedule where one exists, a duty to have requested the information neither unreasonably early nor unreasonably late where one does not — but the effect is identical. An architect who was never chased is not late, they are uninformed, and a contractor who has been ringing rather than writing has nothing to hand an assessor.

So the request-for-information register is not administration, it is the claim: every request numbered, with a date sent, the date the answer is needed by and why that date, the date it arrived, and what changed. "Why that date" is the column people leave blank and the one that does the work — the fourth was the last day the frame could be released and still arrive in week nineteen, and that reasoning has to have been written at the time, not reconstructed in October. Pricing the instruction belongs to the guides on instructing and on pricing a variation; what this one adds is that the two clocks expire at different times, and the notice goes first.

The gang was paid for days the job did not advance

Prolongation and disruption are different animals and get proved differently. Prolongation is the cost of the site existing for longer — supervision, welfare, fencing, scaffold, insurance, the time-related column running two more weeks — priced off a weekly rate the preliminaries guide builds properly. Disruption is what happened inside the fortnight: the men were there, they were paid, and the work went slower or not at all. That is measured in lost hours, and nobody records it, because recording it means writing an unflattering fact down on the day.

Value it at what you pay, not at what you charge. A disruption claim recovers cost; overhead and profit sit on top as a separate line at whatever percentage the contract allows, and rolling the two together is the quickest way to have the whole figure challenged. Then run it twice and keep the totals apart, because they have different destinations — the hours lost to weather are probably yours to absorb even with the extension granted, and only the hours attributable to the late drawing have a route to being paid.

Hours here is productive time lost, not time worked — the diary's standing hours, or the gap between the output you planned for that operation and what the allocation sheets show. Rate is your own cost of employing that person, on-costs included, not the rate you invoice at. Crew size is the gang that stood. Run it once on the weather days and once on the days attributable to the late information: on an unamended JCT form the first is a cost you very likely carry even with the extension in hand, and one combined total invites both to be treated like the weaker one.

Labor Cost Calculator

The total hours the job is expected to take, per worker.

The rate charged (or paid) per worker, per hour.

The number of workers billed at this hourly rate.

Total crew-hours

40 hours

Medium confidence

Figures that depend on a rate wait for yours — this page does not assume one.

What this calculation does not cover

  • One rate is multiplied across every hour and every worker, so there is no tier for overtime or holiday premiums, night and weekend differentials, or a crew that pairs a licensed lead with an apprentice — a mixed-rate job has to be totalled in separate runs and added by hand.
  • Crew size acts as a straight multiplier on the hours you entered, which assumes each additional worker stays productive for the full duration: the tasks that will not split across two pairs of hands, the time a crew loses coordinating, and the helper who is only on site for part of the week all leave the total untouched.
  • Nothing distinguishes a wage you pay from a rate you are charged, because the same multiplication runs on either. A figure built from raw wages carries no payroll taxes, workers' compensation, insurance or benefits on top of it, while a contractor's quoted rate may already have overhead and profit buried inside — the answer looks identical in both cases.
  • Only worked hours are priced. Travel and mobilization, setup and clean-up, tool or equipment hire, disposal, permits and materials all sit outside the figure, and no minimum charge is imposed either — an entry of half an hour returns half an hour of money on a job many trades would bill as a minimum visit.
  • The hours you type are taken exactly as they stand, with no contingency for rework, weather, waiting on an inspection or scope that grows once the walls are open, and the rate is held flat for the whole span — a long program approaching the 2,000-hour entry ceiling is still priced at today's number, with no escalation partway through.

Concurrent, and which half of the claim it kills

The awkward fact about this fortnight is that the two events overlap. The steel was waiting on a drawing across days when the dig could not have progressed anyway, and an assessor will notice that before you do. Concurrency is where contractor claims quietly lose their money half while keeping their time half, and knowing that in advance changes what you ask for.

The mainstream English position runs from Henry Boot Construction v Malmaison Hotel: where an employer-risk event and a contractor-risk event each independently cause the same period of critical delay, the extension is granted notwithstanding the concurrent cause. Time is given. Money generally is not, because you cannot show the employer's event caused a loss your own event would have caused anyway. That asymmetry is the reason the two applications should never have shared an envelope.

Two qualifications matter enough to look up. In Scotland, City Inn v Shepherd Construction opened the door to apportioning a concurrent delay between its causes rather than granting the whole of it. And North Midland Building v Cyden Homes confirmed that a contract may allocate concurrency by drafting: a clause saying no extension is due where a contractor-risk delay runs concurrently with a relevant event is enforceable and does not offend the prevention principle. If that clause is in your amendment schedule you need to know now, not in the assessment meeting.

The move here is to separate the events by date and by operation before anyone does it for you: days on which only the weather was operating, days on which only the information was, and days on which both were. That third column is what will be argued about, and being the person who drew it beats being the person who denies it exists.

Ten weeks of drift on steel you already had a price for

A fortnight of delay is not only a fortnight of standing cost. It moves a procurement date, and a procurement date that moves can cross a price break, a supplier's list revision, or the end of a quotation's validity. The frame was priced in December; the order now goes a fortnight late into a market that has done whatever it has done since. Which side that escalation lands on depends on whether the contract is firm price or carries fluctuations against a base date — ground the pricing-a-variation guide already covers.

What is specific to a delay claim is the measurement discipline. The recoverable figure is the escalation attributable to the delay period only. Not the drift since the contract was signed, which you agreed to carry when you signed a firm price. Not the drift since the quotation was issued, which is partly the same thing. Only the movement across the weeks by which the order date was displaced — a far smaller number than the one a contractor writes down first, which is exactly why it survives an assessment when the larger one does not.

Put in the material subtotal you held a price for and could no longer buy at that price — the steel package, not the contract sum. Months is the displacement of the order date alone: a fortnight is one month at this calculator's resolution, and where the delay pushed you into a re-quote, use the weeks between the planned order date and the actual one rather than the age of the quotation. The annual rate comes from what that supplier's own list did over the same window, from invoices, not from an index covering construction as a whole. Read the change line, not the total.

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

Low confidence

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

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.

Records that will still be worth something in eleven months

Walter Lilly v Mackay gets quoted at contractors for a reason: the claim that succeeded was the one supported by contemporaneous records, and the court was blunt about what their absence costs. A record made on the day is evidence. The same fact reconstructed eleven months later out of memory and invoices is an assertion, and it gets assessed as one.

The set that matters is small and boring. A daily diary with weather, who attended, what they did and what stopped. Labour allocation sheets by operation, which is what turns "we lost time" into hours against a named activity. Photographs with reliable dates. The RFI register with its date-needed column filled in. Delivery notes and the fabricator correspondence. And underneath it a programme — a baseline the employer has seen, with updates saved at intervals rather than overwritten, because an analysis that cannot show what the plan was before the event has nothing to compare the after against.

The vocabulary of that comparison is worth knowing even on a job that will never see an expert. The Society of Construction Law's Delay and Disruption Protocol argues throughout for assessing entitlement while the facts are still visible. AACE International's recommended practice on forensic schedule analysis names what each recognised method needs in order to be run at all, which doubles as a checklist of the records you should have been keeping.

Refusing an extension is a decision to buy acceleration

There is a conversation that happens on jobs like this one, and it opens with the employer saying they would rather you just finished on time. That is not a rejection of the claim. It is an instruction to accelerate, and the moment to say so is before anybody works a Saturday, because acceleration nobody instructed and nobody priced is called constructive acceleration and is difficult to recover afterwards. The RICS guidance note on acceleration exists because the informal version goes wrong so reliably.

So price it as an alternative rather than as an addition. What the employer is being offered is a two-week extension against a sum of money that avoids two weeks of their own loss — and if their liquidated damages rate genuinely reflects what late completion costs them, that rate times two weeks is the ceiling on what acceleration is rationally worth. Knowing that number before the meeting tells you whether to offer the quotation at all.

Settle one more thing in the same letter: what happens if the acceleration is bought and does not work. Recovery plans fail for reasons that have nothing to do with effort, and an agreement silent on whether the extension survives a failed recovery leaves you having spent the money and kept the exposure.

Put in the premium only. The work was already in the contract sum, so what you are pricing is the difference between the recovered programme and the planned one — the overtime uplift rather than the whole overtime hour, the second gang's week, the plant brought forward. Markup is the percentage the contract allows on changed work, which is often not your tender figure. The administrative fee is the one-off re-planning, which happens whether the acceleration is one week or three. Then set the result against the damages rate multiplied by the weeks it avoids: if acceleration costs more than the damages it prevents, the extension is cheaper for the employer too, and that is a better letter than an argument.

Your direct material + labor cost for the added scope.

Markup applied to the additional work, same as your normal project markup.

A flat fee covering paperwork, re-scheduling, and coordination overhead.

Total change order cost

$2,400

High confidence
Markup amount
$300

What this calculation does not cover

  • Markup lands on the added work cost alone — the administrative fee is added after it and is never marked up, so a contract that allows markup on the processing charge will settle slightly above this figure.
  • One percentage covers the whole variation, with no split between overhead and profit and no separate rate for subcontracted work; where a sub's price already carries its own uplift, no second tier is stacked on top of it here.
  • Time is absent from the arithmetic. Nothing is priced for extra days on site, extended preliminaries, or the disruption to work already sequenced around the original scope, which on a mid-project change is often the larger number.
  • The flat fee is counted once per run. Several small variations that each trigger their own charge, or one order bundling unrelated items, have to be worked through individually rather than as a single lump.
  • Deductive changes have no route in: the added work cost cannot be taken below zero, so a credit for scope removed has to be handled as its own line away from this page.
  • The added work cost is entered as one figure, so nothing distinguishes short-notice material pricing, restocking on cancelled orders, or remedial work to undo what was already built — those belong inside the number you type, or they are missing from the total.

What actually makes liquidated damages fall over

Contractors reach for the word penalty far too early. The old formulation in Dunlop Pneumatic Tyre v New Garage — that the sum must be a genuine pre-estimate of loss — was replaced by the Supreme Court in Cavendish Square Holding v Makdessi and ParkingEye v Beavis with a different question: whether the clause imposes a detriment out of all proportion to the innocent party's legitimate interest in performance. That is a much harder test to fail, and a rate that merely looks generous is unlikely to be struck down for being generous.

The provisions that do fall over fall over on machinery rather than on amount. The prevention principle is the one to know: where the employer causes delay and the contract has no adequate extension of time machinery for it, time can be set at large, the fixed date disappears, the obligation becomes one to complete within a reasonable time, and the damages go with the date. Peak Construction v McKinney Foundations is the source; Multiplex v Honeywell drew its limits, including the unwelcome half — a contractor who fails to operate a valid notice provision cannot generally use their own failure to put time at large.

Two further points travel into the meeting. The deduction has a procedure of its own — extension assessed, non-completion notified or certified, written notice of intention to withhold served before money moves — and skipping a step frequently defeats it even where the delay was real; that procedure belongs to the guide on settling a final account. And where a contract is terminated before completion, Triple Point Technology v PTT settled that liquidated damages accrue up to termination rather than evaporating.

None of that is a reason to run the argument. It is a reason to serve a valid notice, because almost every route by which liquidated damages come off depends on the extension of time machinery having been operated properly — and the party who operated it properly is you.

What to hold back while the assessment is open

Between the application and the assessment there are weeks in which you carry an unknown, and the honest question is not what you expect to recover but what you can survive not recovering. Assessments land under applications routinely, and here for three reasons: the weather half is time-only by design, part of the disruption falls to concurrency, and any line without a contemporaneous record behind it gets discounted whether or not it happened.

So add the three numbers the sections above produced — disruption hours, escalation on the frame, prolongation at your weekly rate — and ask what proportion you cannot demonstrate to the standard your contract sets. That is not a pessimism setting. It is a list you can write out item by item, and if you cannot write the list, the figure you are carrying in your head is a guess.

This one runs in reverse of its usual job. The base is the delay cost you have now priced, and the percentage is the share you expect to lose rather than the share you want to add — the weather-day hours that carry time and no money, the days that will be treated as concurrent, and anything not evidenced from a record made at the time. Ignore the headline total and read the contingency amount: that is the cash you must absorb before the assessment lands, and if it is bigger than you are comfortable with, the answer is another afternoon on the records rather than another percentage.

Your planned budget before adding a buffer for the unexpected.

The extra buffer to add for unexpected issues.

Total budget with contingency

$23,000

Medium confidence

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

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.

What has to be gathered before the particulars go

The notice needs no figures, so nothing here delays it — send that today. These are what the particulars get built from, and the reason to assemble them this week is that most can only be gathered while the people who were on site that fortnight still are.

  • Two dates per event: when it arose, and when it became apparent — Every notice period in every common form runs from awareness rather than from measurement. On the steel both fall on the fourth, the day the information failed to arrive; on the ground they part, because the water fell before the formation refused plant.
  • The baseline programme, and an update saved at the start of the fortnight — Without a plan predating the event an analysis has nothing to compare against. Save updates as separate files rather than overwriting the live one.
  • Weather records for the same fortnight across the last ten years — Met Office historic station data, or NOAA's Local Climatological Data. This decides whether the weather claim is worth writing before you spend a day on it.
  • Allocation sheets split into weather days, information days, and both — That third column is what the concurrency argument will be about, and drawing it yourself beats having it drawn for you.
  • The liquidated damages rate, and the period it runs per — It sets the exposure the notice protects you from, and caps what acceleration is rationally worth to the employer.
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Drawn from

  • JCT Standard Building Contract with Quantities (SBC/Q) — Relevant Events, the notice of delay and the assessment of a fair and reasonable extension of time; Relevant Matters and the loss and expense provisions
  • JCT Intermediate Building Contract and JCT Minor Works Building Contract — the shorter extension of time provisions used at small-works scale
  • JCT Design and Build Contract
  • NEC4 Engineering and Construction Contract — core clause 6, compensation events; the eight-week notification period; the weather compensation event assessed against a weather measurement place and weather data stated in Contract Data, on a ten-year return period
  • FIDIC Conditions of Contract for Construction (Red Book) — the contractor's claims provisions, and the twenty-eight-day notice running from when the contractor became aware or should have become aware of the event
  • AIA Document A201, General Conditions of the Contract for Construction — Article 8 (Time) and Article 15 (Claims and Disputes)
  • Society of Construction Law, Delay and Disruption Protocol, 2nd edition (February 2017) — core principles on notice, contemporaneous assessment, float and concurrent delay
  • AACE International Recommended Practice No. 29R-03, Forensic Schedule Analysis
  • AACE International Recommended Practice No. 52R-06, Time Impact Analysis — As Applied in Construction
  • CIOB, Guide to Good Practice in the Management of Time in Major Projects
  • BS 6079, Project management
  • RICS guidance note, Acceleration
  • RICS guidance note, Damages for delay to completion
  • Peak Construction (Liverpool) Ltd v McKinney Foundations Ltd (1970) 1 BLR 111 — the prevention principle where the contract contains no adequate extension of time machinery for employer-caused delay
  • Multiplex Constructions (UK) Ltd v Honeywell Control Systems Ltd (No 2) [2007] EWHC 447 (TCC) — the limits of the prevention principle where the contractor has failed to operate a notice provision
  • Steria Ltd v Sigma Wireless Communications Ltd [2007] EWHC 3454 (TCC) — clear conditional wording can create a condition precedent without using the phrase
  • Obrascon Huarte Lain SA v Attorney General for Gibraltar [2014] EWHC 1028 (TCC) — when time begins to run under a FIDIC notice provision
  • Henry Boot Construction (UK) Ltd v Malmaison Hotel (Manchester) Ltd (1999) 70 Con LR 32 — extension of time granted notwithstanding a concurrent contractor-risk cause
  • City Inn Ltd v Shepherd Construction Ltd [2010] CSIH 68 — apportionment of concurrent delay in Scots law
  • North Midland Building Ltd v Cyden Homes Ltd [2018] EWCA Civ 1744 — an express contractual allocation of concurrent delay is enforceable
  • Walter Lilly & Co Ltd v Mackay [2012] EWHC 649 (TCC) — the weight given to contemporaneous records in delay and loss and expense claims
  • Dunlop Pneumatic Tyre Co Ltd v New Garage and Motor Co Ltd [1915] AC 79 — the genuine pre-estimate formulation
  • Cavendish Square Holding BV v Talal El Makdessi and ParkingEye Ltd v Beavis [2015] UKSC 67 — the current test for an unenforceable penalty
  • Triple Point Technology Inc v PTT Public Company Ltd [2021] UKSC 29 — liquidated damages accruing up to termination
  • Housing Grants, Construction and Regeneration Act 1996, Part II — adjudication under section 108, and section 106 excluding a contract with a residential occupier
  • Met Office historic station data, and the MIDAS surface observation records held in the CEDA Archive
  • NOAA National Centers for Environmental Information, Local Climatological Data

Guidance, not a specification. Local codes, the engineer of record and the product manufacturer’s instructions govern where they differ from anything written here.