Reclaiming VAT on a Self-Build: Sorting the Box Before the Six Months Run Out

Four hundred invoices, three ring binders and a date on a certificate

The completion certificate came through from building control on a Tuesday in the same week the scaffold went. The house is a two-storey infill on what used to be the side garden of a semi, built over nineteen months with a groundworker, a timber frame erector, a roofer, and a long tail of trades engaged one at a time. On the dining table are three ring binders and a cardboard box: merchant invoices, delivery notes, a stack of statements, card receipts from a plumbers' merchant, a folder of emails with PDFs attached, and one bundle nobody has looked at since the winter. Somewhere in that pile is a five-figure sum of VAT.

It is recoverable, once, and the clock started on the date printed on that certificate. Not on the date the last trade left, not on the date the family moved in, and not on the date somebody gets round to opening the box. What follows is the sort: which of those pieces of paper carries tax the scheme will give back, which carries tax that was never properly chargeable and therefore cannot be given back by anybody except the person who charged it, and which is simply a receipt for something the scheme has never covered and never will.

A refund, not a reclaim, and there is exactly one of them

The word reclaim is doing damage before the first invoice is picked up, because it borrows the mental model of a VAT-registered business recovering input tax. A business recovers on a return, quarterly, against output tax, and if it gets a quarter wrong it adjusts the next one. None of that applies here. Section 35 of the Value Added Tax Act 1994 creates a refund to a person who constructs a dwelling otherwise than in the course or furtherance of any business — a standalone entitlement, exercised by application, by somebody who has no registration, files no returns and has no mechanism for a second thought.

That single-shot shape governs every decision on this page. One claim covers the whole build, from the first load of stone to the last coat of paint, and it is made after the building is finished rather than as you go. An invoice that turns up in the loft a fortnight after filing is not a small administrative problem; it is a sum that has left the project. A pile you decide to leave out because it looked contentious is a pile you have decided to give up. And a claim submitted after the window has closed is refused as late, however impeccable the invoices inside it are.

The second consequence catches careful people. Because there is no return, there is no moment at which somebody else reviews the position — no quarterly reconciliation, no bookkeeper asking why the rate on that invoice is what it is. Nineteen months of decisions taken at a trade counter arrive unexamined at one desk and get one answer. Almost everything on this page should have been done at the time, and can still, just about, be done now.

Twenty per cent on a new-build labour invoice is not yours to get back

Here is the thing that costs self-builders more than every blocked appliance in the country put together. On the construction of a new dwelling in the United Kingdom, the contractor's services are zero-rated. Not reduced, not refundable — zero. That relief runs down the chain on an ordinary new dwelling, so the plumber, the roofer and the plasterer engaged directly by a self-builder acting as their own main contractor should each be invoicing at nothing, on their labour and on any materials they supply and fix as part of that work. What earns that rate and where the boundaries of it sit is the supplier's decision, and the sibling guide on getting the VAT rate right sets it out from behind their desk.

The consequence for the person holding the invoice is stark and not intuitive. Where a trade has charged twenty per cent on a supply that should have been zero-rated, the tax was not properly chargeable — and the scheme refunds tax that was properly chargeable. HMRC will not refund it. There is one route left, and it is the one nobody wants: go back to the trade, ask them to credit the original invoice and re-issue it at the right rate, and take the difference from them rather than from the state.

The difficulty of that conversation is a function of how long you leave it. In month four the invoice is recent, the account is live, another payment is coming and the trade has every reason to help. At completion the roofer may have wound the company up, retired, deregistered or simply stopped answering, and the money has gone with him. Which is the argument for reading rates as invoices arrive rather than at the end — not because the rate is your responsibility, but because the recovery is.

The mirror of it is the good news, and it is why the scheme exists at all. Buy the same materials yourself over the counter and the merchant charges twenty per cent, correctly, because a sale of goods on their own is standard-rated whoever the buyer is and whatever the goods are going into. That tax is properly chargeable, and that is precisely the tax section 35 gives back. So the scheme is not a subsidy. It is a levelling device: it puts the self-builder who buys their own bricks in roughly the same position as the one who paid a contractor to supply and fix them under the zero rate, and it does nothing else. Which is why the question below is never what the goods are, but who supplied them, and whether what they supplied was goods or a service.

Hire is not a material, and neither is anything that only made the work possible

The claim is for building materials incorporated into the building. Two words in that sentence do the excluding, and between them they take out a surprising share of what a self-builder spends. Incorporated removes anything that came to site, did its job and went away again. Materials removes services, however physical the service felt at the time.

So the digger on hire is out, and so is the telehandler, the tower scaffold, the acrow props, the site cabin, the fencing, the temporary supply, the skips, the muck away and the tool hire from the same counter that sold you the blocks. Consumables that never became part of the building go the same way: the drill bits, the blades, the sandpaper, the white spirit, the tarpaulins, the fixings you bought and never used. Tools you bought outright are goods, but they are not incorporated in anything, and the fact that the house could not have been built without them is not the test the scheme applies. Delivery charges follow whatever they are charged on and are worth reading rather than assuming, because a merchant's paperwork does not always put them where you expect.

One distinction here is worth checking in the notice rather than reasoning about, because it turns on how the supply is described rather than on what arrives. Plant hired with an operator can be a supply of construction services rather than a hire of goods, which puts it on an entirely different footing on a new dwelling from the same machine hired bare. HMRC's VAT Notice 708 is where that boundary is drawn, and the answer changes what should have been on the invoice — which, on this page, is always the question that matters. Scaffolding is the everyday version of the same split, and the notice deals with it separately: the hire of the scaffold stands apart from erecting and striking it on a new dwelling, which is work on the building. An invoice charging one rate across the whole job is therefore one to read rather than to drop into the hire pile unopened — not because any of it is claimable, but because the part of it that should not carry tax belongs on the list of calls to make.

Professional fees are argued hardest about and lost fastest. The architect, the structural engineer, the planning consultant, the SAP assessor, the air-tightness tester, the building control body, the warranty provider and the party wall surveyor all supply services, all correctly charge the standard rate, and none is refundable under the scheme at any stage. On a self-managed build the aggregate is not trivial, and it belongs in the project budget as a cost that stays a cost rather than in a mental total of tax that is coming back.

Some of what came back from the merchant is not a VAT invoice

A claim is built on invoices, and the scheme means the word precisely. What arrives from a builders' merchant over nineteen months is a mixture of invoices, statements, delivery notes, order acknowledgements, pro-formas and card slips, and a fair share of it will not support a claim. This is the dullest part of the job and reliably the part that costs money, because the fix is free while the account is open and impossible once it is closed.

The particulars a VAT invoice has to carry are set by the VAT Regulations 1995 — the supplier's name, address and VAT registration number, an invoice number and date, a description of what was supplied, the amount and the rate of tax. Below a threshold of two hundred and fifty pounds including tax, a supplier may issue a less detailed invoice instead, which is why a till receipt from a trade counter can be perfectly good evidence and a card machine slip from the same shop is not: one carries the VAT number and the rate, the other carries a total and a time.

Two failure modes are worth naming because both look fine in the folder. The first is the statement, which lists twelve deliveries and one balance and is an invoice for none of them; it is the commonest thing in a self-builder's box and it supports nothing. The second is the invoice addressed to somebody else — the trade who opened the account, ordered on your behalf and passed the goods on. Neither is fatal on the day of delivery and both are hard a year later, which is the case for the dull habit: an account in your own name, at the site address, from the first load.

Completion is partly your decision, and it is the only date the scheme measures from

Everything above is arithmetic. This is the part with a hard edge on it. The claim has to be made within a period running from completion of the building, and completion is evidenced by a document rather than asserted by the claimant. A completion certificate from the local authority or the private building control body is the usual one; where that is not available, the notes to the claim form set out what else HMRC will look at, and a Valuation Office Agency letter banding the house for council tax is the alternative most self-builders end up with.

The length of that window changed, and the change is why anybody reading a forum thread from a few years ago is working to a deadline that expired before the real one does. It used to be three months. Amending regulations made in 2023 lengthened it and put the claim online at the same time, and the current claim notes are the only safe place to read what it is now. Three months is wrong and six months believed on somebody's say-so is not much better; the useful discipline is to write the date the certificate carries at the top of the schedule and read the deadline off the current notes on the same afternoon.

The awkward consequence sits on the other side of that date. Goods bought after the building is complete were not bought in the course of constructing it, so the last stretch of a build has a shape the paperwork imposes on it: the house has to be finished before the clock starts, and buying continues after the house is finished on almost every self-build ever run. There is no clever answer to that tension. There is only sequencing — knowing which document is going to evidence completion, knowing roughly when it will be issued, and getting the material purchases done on the correct side of it rather than discovering the boundary afterwards.

Two late invoices catch people who have done everything else right. The first is the trade who has not billed yet, months after finishing, whose invoice cannot go into a claim already filed and cannot be excluded from a house already built. The second is retention. Where the self-builder held a percentage back from a contractor, the tax point on the released sum follows the release rather than the original valuation — which the guide on settling a final account works through — so on a conversion, where a trade's services carry the reduced rate rather than nothing, a retention invoice raised nine months after completion falls outside the claim entirely. On a new build the services were zero-rated and nothing is lost; on a conversion it is real money. Settle the account and get the invoice raised before you file, rather than filing and hoping.

1. Decide which document will evidence completion, ask the body that issues it roughly when it will be signed, and read the deadline off the current claim notes the same day — then write both dates on the front of the schedule.
2. Bring forward every remaining material purchase to the correct side of that date, and stop buying afterwards.
3. Close out the trade accounts: ask every contractor who has not billed to bill now, and settle any retention so the invoice exists before the claim is assembled.
4. Work the wrongly rated list to the end — credit notes and corrected invoices take weeks, and a trade that has gone quiet needs the whole of the window rather than the last fortnight of it.
5. Assemble the pack: the planning permission and the approved plans, the completion evidence, the schedule and every invoice behind it.
6. File inside the window, and keep the originals until the money has cleared, whatever was uploaded.

Where the scheme stops

Three limits decide whether any of the above applies at all, and all three are settled long before the invoices are sorted. The first is purpose: the refund exists for a person building otherwise than in the course or furtherance of a business, so a house built to sell on completion or to let sits outside it and belongs to a different set of arrangements entirely. Intention at the time is what matters, and a genuine home that circumstances later force onto the market is not the same case as a build undertaken to be sold.

The second is the planning position. The building has to be a dwelling in the sense the legislation uses, constructed in accordance with a statutory consent, and the condition that does the damage is the one prohibiting separate use or disposal — the annexe consented on terms that it may not be sold apart from the main house, the holiday occupancy restriction, the agricultural tie. Any of those takes the building outside the definition and the claim with it. The four conditions and the reason that one is so lethal are set out in full on the sibling guide about getting the rate right, and they are worth reading before a plot is bought rather than after a house is finished.

The third is what was built. The scheme reaches beyond new houses: converting a non-residential building into a dwelling has its own claim form, and the arithmetic there differs in a way that matters, because the trade's services carry the reduced rate rather than nothing and that reduced-rate tax is refundable alongside the materials. A dwelling unoccupied for long enough is treated as non-residential for these purposes and comes in the same way. Which of those a given building is turns on the schedules and on the evidence, and that determination — not the sorting, not the deadline — is the one worth an hour of somebody qualified.