Getting the VAT Rate Right on Building Work

The bungalow has been empty since the March before last

The stage-two invoice is sitting in the accounts package with every field filled in but one. Three rooms of a 1960s bungalow re-plastered, a bathroom stripped and refitted, first fix of a rewire, and a client who has forwarded an email from her accountant containing a single line: I'm told this should be at five per cent. She may well be right. The house has stood empty since her mother went into care, the probate took most of a year, and nobody has slept in it since. But being probably right is not what the rate field is asking for.

It is asking whose money is at risk, and the answer is not comfortable. Output tax is the supplier's liability. Charge five per cent on work that should have carried twenty and it is you HMRC assesses for the fifteen points, years later, with interest and possibly a penalty — not the client, not her accountant, not the merchant who sold you the plasterboard. Whether you can then go back to the client depends entirely on what your contract says, and a one-page domestic quote almost never says anything. On a job this size the fifteen points exceed the margin, so a rate decision taken casually in April can wipe out the profit on a job that went perfectly.

Three questions stand between the work and the rate box, and none is answered by looking at the invoice. What is this building, in the terms the legislation uses rather than the terms the client uses. What is being done to it, in the same terms. And what could you put in front of an officer three years from now that proves both. What follows is the United Kingdom regime; the shape of the problem recurs elsewhere and one section says where.

Twenty is the answer until you have earned a different one

The default is not neutral ground and it is not a starting point for negotiation. A supply of construction services in the United Kingdom carries the standard rate — currently twenty per cent — unless the supply falls inside one of the lists in the Value Added Tax Act 1994. Zero-rated supplies live in Schedule 8; supplies charged at the reduced rate of five per cent live in Schedule 7A. Both schedules are closed lists with notes attached that do most of the real work, and neither contains a general principle that housework is cheaper, that domestic clients deserve a break, or that a job which feels like a conversion is one. The relief exists where the schedule says it exists and nowhere adjacent to it.

Five doors lead out of the standard rate on housing work, and it is worth knowing which one you are standing in front of before the quote goes out, because the evidence each demands is different and some of it can only be collected before the work starts. HMRC VAT Notice 708, Buildings and construction, turns those schedules into something readable on a Tuesday evening — not because guidance overrides law, but because it is where HMRC sets out the interpretation an officer will bring to your file.

What empty has to mean, and who is allowed to say it

The empty-home reduced rate is the one most often claimed on a handshake and most often lost on a visit. The test is that the dwelling was not lived in during the two years immediately before the work starts. Every word in that sentence is doing something. Lived in, not owned, not furnished, not connected to a meter. Two years, not eighteen months and a bit. And immediately before the work starts, which means the clock is read on the day the first operative arrives, not on the day the client rang, not on the day you quoted, and certainly not on the day you invoice. A job that would have qualified in February can fail in May because a nephew stayed there for a fortnight in between.

So the question is evidentiary rather than legal, and it has a best answer. The local authority's empty property officer keeps records of exactly this and will write a letter confirming a period of non-occupation; HMRC's guidance treats that letter as the strongest single piece of evidence available, and it costs a phone call. Behind it sit council tax records showing an empty-property exemption or premium, the electoral roll, and utility letters confirming disconnection or nil consumption. What is not evidence, in any combination, is the client saying the house has been empty for ages, particulars describing it as a probate sale, or your recollection that the garden was waist-high. Those are all reasons to go and get the evidence. None of them is the evidence.

The edges catch honest builders. A property occupied by squatters has been lived in, whatever the owner thinks of it. A holiday home used three weekends a year is emphatically not empty. Someone camping in one room while doing the work themselves has occupied it. Running the other way, Notice 708 makes room for the buyer who moves in: where the dwelling was empty for the qualifying period before it was acquired and the work is done within a stated period of acquisition, the new owner's occupation does not by itself destroy the relief. That period is in the notice and is not reproduced here, because a builder relying on a half-remembered number for that particular rule is the one who ends up short by a month.

There is a second threshold further out that changes the answer for the client rather than for you. A dwelling that has stood unoccupied for ten years or more is treated for some purposes as though it were not residential at all, which opens the zero rate on a first sale or long lease after conversion and brings a self-converter inside the DIY claim scheme. It does not change your rate: your services on the fabric are still reduced-rated, and the ten-year point is the developer's or the owner's, not the contractor's. What that reclaim involves, and why buying materials yourself behaves so differently from having them supplied and fitted, belongs to the self-build guide rather than to this page.

Counting dwellings, and the four things one has to satisfy

The conversion route is not a reward for converting something. It is a test on a count: the number of single household dwellings in the building before the work against the number after it, and unless those two differ there is no relief however substantial the job. An empty barn becoming one house goes from none to one and qualifies. A house divided into two flats goes from one to two and qualifies. Three flats knocked back into one family house goes from three to one and qualifies too — direction is irrelevant, only change counts. A three-bedroom house gutted, re-planned, extended and handed back as a four-bedroom house goes from one to one, and carries the standard rate on every penny. That last case is the one clients argue about, because the work was enormous and the answer feels wrong. The answer is still the answer.

Two variants sit alongside it. A conversion producing a house in multiple occupation — bedsits with shared facilities rather than self-contained flats — has its own limb, because the count of single household dwellings may not move at all. A special residential conversion, producing a care home, a children's home, student accommodation or a hospice, is treated differently again and is the one route here needing paperwork from the customer: a certificate of intended use, issued by them and held by you. The same certificate machinery governs construction for a relevant residential or relevant charitable purpose, and it carries a trap worth knowing even if you never build a care home. On certificated jobs the relief runs only to the person supplying the certificate holder, so the main contractor zero-rates and every subcontractor beneath charges the standard rate; on an ordinary block of new dwellings there is no such restriction and the subcontractor zero-rates alongside. Where your own tier sits on a reduced-rate conversion is a question for Notice 708 and the contract in front of you, not for analogy with the last job.

Then there is the definition of a dwelling itself, which is where a scheme that passed the counting test falls over. The notes to Group 5 say a building is designed as a dwelling only where four conditions are satisfied for each dwelling in it, and all four have to hold together. The dwelling consists of self-contained living accommodation. There is no provision for direct internal access from it to any other dwelling or part of one. Statutory planning consent has been granted for that dwelling and the construction or conversion has been carried out in accordance with it. And — the one that does the damage — the separate use or disposal of the dwelling is not prohibited by the term of any covenant, statutory planning consent or similar provision.

That last condition kills more claims than the other three together, and it is invisible on a drawing. Annexes are routinely consented subject to a condition that the accommodation shall not be used or sold separately from the main house, precisely because the planning officer did not want a second dwelling on the plot. Holiday lets carry occupancy conditions; rural conversions carry agricultural ties. Every one of those is a prohibition on separate use or disposal, and every one takes an otherwise perfect granny annexe out of the relief and puts it back at twenty per cent. The condition is printed on the decision notice, usually two-thirds of the way down, in a paragraph the client has never read and the architect stopped worrying about the day consent was granted — which makes that notice a document you ask for before you price, not one you go looking for when an officer asks.

1. Get the decision notice itself, not the reference number and not the client's summary — the conditions are the point and they are only on the notice.
2. Read every condition to the end for the words used or sold separately, an occupancy restriction, or a tie to another building or an agricultural holding. Any of them ends the dwelling argument.
3. Check the approved drawings against what is actually being built: the relief depends on the work being carried out in accordance with the consent, not merely under it.
4. Count the self-contained units on the approved plan and on the existing-building plan and write both numbers down. That difference is the whole conversion test.
5. Look for an internal door between the new unit and the existing house — provision for direct internal access to another dwelling defeats the definition, and it is usually drawn in for the client's convenience without anyone costing it.
6. Put the notice and both plans in the job file the day you quote. Reconstructing this two years later means a planning-portal search and an argument about which version was approved.

The file, and the four years after the last invoice

Nothing on this page is tested on the day you send the invoice. It is tested when an officer picks the job out of a return two or three years later and asks why the rate was five. HMRC can assess for underdeclared VAT within four years of the end of the accounting period concerned, stretching to twenty where the loss of tax was brought about deliberately. VAT records generally have to be kept for six years, and under Making Tax Digital they have to be digital with digital links between them — which helps here rather than hinders, because rate evidence is exactly the sort of thing that lives in a paper folder and disappears in an office move.

The file that survives that conversation is small and specific: not your narrative, but the two or three documents that make the rate the only available conclusion. Assembled at the time it takes twenty minutes; assembled afterwards it is a fortnight of chasing a council, a former owner and a utility company for records about a house you no longer have keys to.

Where the position is genuinely unclear — a part-conversion of a building in mixed use, an annexe with an ambiguous condition, a phased job that may or may not be one supply — HMRC's non-statutory clearance service exists to be asked. Set out the facts and your own analysis and you get a written answer you can rely on for that transaction. It takes weeks, which is why it is asked before the quote rather than after the first payment, and it is the best single entry a file can hold: a judgement you made converted into a position HMRC gave you.

1. The decision notice with its conditions, and the approved drawings the work was carried out in accordance with.
2. On an empty-home job, the empty property officer's letter — or, failing that, council tax and electoral roll extracts and utility confirmations, gathered before the first day on site.
3. The dwelling count before and after, with the plan references it was read from, for any changed-number-of-dwellings conversion.
4. The customer's certificate for a special residential conversion or a relevant residential or charitable purpose building, in original form rather than as an assurance over the phone.
5. The apportionment method for any mixed-rate contract, in a sentence, with the areas or priced build-up it came from.
6. The invoices themselves, showing each rate separately as the VAT Regulations require — the document an officer reconciles the rest of the file against.

When the rate on the invoice was wrong

Undercharging is the expensive direction. The tax was due whether or not you collected it, so HMRC assesses you for what should have been charged, and the client is under no obligation to make you whole unless the contract said so. The remedy is a credit note cancelling the original invoice and a corrected one at the right rate, which puts the difference in front of the customer as a claim rather than a fact — and a claim you will win or lose on the wording of a document written before anyone knew there was a problem.

Overcharging is not the safe error people assume. VAT shown on an invoice is owed to HMRC whether or not it was due, so charging twenty on work that qualified at five does not leave you holding a windfall; it leaves you having collected tax you must pay over. Recovering it means a claim, and a claim of that kind generally requires you to reimburse the customer, because the customer is the person who bore it. A client who has since sold the house and stopped answering emails makes that arithmetic worse than it looks.

The mechanics of correction are ordinary and worth knowing before you need them. Small errors are adjusted on the next return; errors above the threshold in HMRC's guidance on correcting VAT errors, and deliberate ones, are notified separately on the prescribed form. Unprompted disclosure matters more than people expect: the penalty regime in Schedule 24 to the Finance Act 2007 scales by behaviour — reasonable care, careless, deliberate — and by whether you told them or they found it, and the reduction for going first is substantial. The worst version of this is not a wrong rate. It is a wrong rate that was noticed, discussed internally, and left alone for another eleven invoices.