The short version
- · New self-build homes (your main residence) are zero-rated for VAT.
- · Materials VAT is reclaimable; most professional fees are not.
- · One claim per project, submitted within six months of completion.
- · Form VAT431NB for new builds, VAT431C for conversions.
- · Conversions of non-residential buildings qualify at 5%, reclaimable.
How the DIY Housebuilders' Scheme works
VAT is normally a cost that builders and developers pass to buyers in the sale price. Self builders don't have a developer to absorb it — so HMRC built the DIY Housebuilders' Scheme to put self builders in the same position as someone buying a new home from a housebuilder, where the new dwelling itself is zero-rated.
The mechanism is straightforward. While you're building, you pay 20% VAT on materials at the till like anyone else. Your VAT-registered main contractor or trades zero-rate their labour and the materials they supply directly — so you only pay VAT on the materials you buy yourself, plus a small amount on things like hire equipment.
After completion, you submit one claim covering all the VAT you paid that qualifies. HMRC refunds it to your bank account, typically within 30 days if the paperwork is clean.
What qualifies, and what doesn't
HMRC publishes lists. As a rule of thumb: anything that becomes a permanent part of the building qualifies; anything you take with you when you move doesn't.
Reclaimable:
- · Structural materials — frame, blocks, timber, roof, windows, doors.
- · First-fix and second-fix materials — pipework, cables, plasterboard, insulation.
- · Fitted kitchens (units, worktops, sinks) and fitted bathrooms.
- · Built-in appliances — only the appliance, not freestanding versions.
- · Boilers, solar panels, heat pumps, ground source heating.
- · Hard landscaping forming part of the planning permission (paths, drives).
Not reclaimable:
- · Professional fees — architect, engineer, surveyor, project manager.
- · Tool hire and consumables not incorporated into the building.
- · Freestanding white goods, furniture, carpets (unless fitted).
- · Soft landscaping, ornamental planting, sheds, outbuildings not on the permission.
- · Labour from VAT-registered contractors — they zero-rate it directly, so there's no VAT to claim.
The six-month deadline
You have six months from completion to submit. Completion is the date your Council Tax certificate is issued, the date your building control completion certificate is signed, or (occasionally) a date HMRC accepts on other evidence — whichever is earliest. The clock starts whether you've moved in or not.
Missing the deadline is the most common way self builders lose their VAT reclaim. The forms aren't onerous — what kills people is leaving the paperwork until "later" and never quite getting to it. Block out a weekend after Council Tax registration to get it filed.
Evidence and record-keeping
HMRC routinely queries DIY scheme claims, and they will ask for original VAT invoices. Photocopies and statements aren't enough. Set up an envelope or a folder on day one of the build and put every receipt in it the day you get it — supplier-printed VAT invoices, not till receipts where possible.
A clean claim has:
- · Original VAT invoices showing supplier VAT number, your name and address, item description and the VAT charged.
- · The planning permission (or PiP + Technical Details Consent) showing the dwelling was permitted.
- · The certificate of completion (Council Tax or building control).
- · A clear schedule of what each invoice claims for — categorising helps HMRC and helps you.
Conversions: a different form, a different rate
Converting a non-residential building into a single dwelling — a barn, an old chapel, a redundant office — qualifies under the same scheme but uses Form VAT431C. The reduced rate of 5% applies to the contractor's labour and materials they supply; you can reclaim the VAT you paid on materials you bought yourself at the same 20% rate as a new build.
Converting an existing dwelling (a house to flats, a flat to a house) only qualifies if the building has been empty for at least 10 years immediately before work starts. That's a high bar and the evidence requirements are strict — utility records, electoral roll absence, photographs.
Two worked examples
150m² standard-spec new build, owner-occupier
Build cost around £435,000 (£2,900/m²). Materials ~£174,000. Most labour is zero-rated by a main contractor, but the owner buys ~£60,000 of materials directly (kitchen, sanitaryware, some second-fix). VAT paid: ~£10,000. Reclaim: ~£10,000. Claim filed five months after Council Tax registration, paid 28 days later.
200m² self-managed bespoke, no main contractor
Owner project-manages, buying most materials directly and paying labour to trades who zero-rate their bills. Build cost ~£600,000, materials ~£240,000. VAT paid on materials bought direct: ~£40,000. Reclaim: ~£40,000. The materials VAT recovery is enough to fund the kitchen and the landscaping above the contingency.
Estimate your reclaim
Plug in your floor area and specification level. The calculator assumes ~40% of build cost is materials and that VAT is 1/6 of the VAT-inclusive material spend — close to the actual mix on most projects.
Interactive — VAT reclaim estimator
How much VAT can you claim back?
New self-build homes are zero-rated for VAT. You pay it on materials as you go, then reclaim it from HMRC after completion under the DIY Housebuilders' Scheme.
Specification
Estimated VAT reclaim
£29,000
On a £435,000 build at 2,900/m².
Build cost
£435,000
Materials (~40%)
£174,000
VAT to reclaim
£29,000
- · Materials qualify; most professional fees and labour from VAT-registered contractors do not (they're already zero-rated).
- · You can only submit one claim, after completion. Keep every receipt.
- · Conversions of non-residential buildings to dwellings may also qualify, at reduced rates.
Frequently asked
Can I claim VAT back on a self build?
Yes. New self-build homes built in the UK as your main residence are zero-rated for VAT. You pay VAT on materials as you go and reclaim it from HMRC after completion through the DIY Housebuilders' Scheme. Most materials qualify; most professional fees do not (your VAT-registered builder zero-rates their labour for you directly).
How much VAT can I reclaim on a self build?
Materials typically make up ~40% of total build cost; VAT on those materials is the reclaimable portion. On a £450,000 build, that's roughly £180,000 of materials and around £30,000 of VAT to reclaim. Use the calculator on this page for an estimate based on your floor area and specification.
What's the deadline to claim VAT on a self build?
You have six months from the date of completion to submit your claim. "Completion" usually means the date of your Council Tax certificate or building control completion certificate, whichever HMRC accepts as proof. You can only submit one claim — get it right first time.
Can I reclaim VAT on professional fees like architect or engineer?
No. Professional services — architects, engineers, surveyors, project managers — are standard-rated and the VAT is not recoverable under the DIY scheme. The exception is design-and-build contracts where the contractor zero-rates the entire supply (including their design fees) directly.
Can I reclaim VAT on a conversion?
Sometimes. Converting a non-residential building into a dwelling — barns, redundant offices, churches — qualifies for the reduced 5% rate, and the VAT paid is reclaimable. Converting an existing dwelling doesn't qualify unless it has been empty for at least 10 years. The rules are stricter than for new builds; take advice before assuming.
Do I have to be VAT-registered to claim?
No — the DIY Housebuilders' Scheme is designed for individuals building their own home, not for VAT-registered businesses. You don't register for VAT, you just submit Form VAT431NB (new builds) or VAT431C (conversions) after completion with your evidence.
What evidence do I need to keep for a VAT reclaim?
Original VAT invoices for every material purchase you want to claim against, the planning permission, the certificate of completion (Council Tax or building control), and proof the dwelling is your principal residence. Keep everything — HMRC routinely queries reclaims.
Disclaimer. This page is general information, not tax advice. VAT thresholds, eligible items and procedural rules change. Always verify current guidance with HMRC's DIY Housebuilders' Scheme guidance and consider professional advice before submitting.
Related