DIY Housebuilder VAT Claims: Are You Missing Out on Thousands in Refunds?
For individuals building their own home, the DIY Housebuilder VAT Refund Scheme can offer significant savings. Yet, many people miss out on large sums — either by not claiming at all, or because HMRC rejected part of their claim.
At Merranti Accounting, we help clients maximise their VAT recovery while staying compliant with HMRC rules. This blog breaks down the key points you need to know, drawing on recent tribunal decisions like Mort v HMRC (2023) that offer useful guidance — and some hope.
What Is the VAT DIY Housebuilder Scheme?
This scheme allows individuals who are building or converting their own home to reclaim VAT paid on eligible construction materials. It is designed to put self-builders on a similar VAT footing to professional developers, who are typically VAT-registered and can recover input VAT on new builds.
You can find official HMRC guidance here:
Key Points to Know
You Only Get One Claim Per Build
HMRC’s policy is strict — only one claim per property is permitted. This means:
- You need to keep comprehensive records of all your VAT invoices.
- Submit your claim within six months of completion (i.e., when the property is ready for use or occupation).
- Late claims or forgotten invoices may be difficult to recover later — though Mort v HMRC showed supplementary claims might be accepted in certain cases.
HMRC’s VAT Construction Manual – Single Claim Rule
You Can’t Reclaim VAT Charged Incorrectly
If a supplier charges 20% VAT when they should have charged 0% or 5%, HMRC won’t usually refund this. They expect you to go back to the supplier for correction.
This can be a problem if the supplier has ceased trading or gone into liquidation. However, some legal arguments (like the Reemtsma principle) suggest you might still be able to reclaim from HMRC — watch this space as those arguments work through the courts.
A Turning Point: Mort v HMRC (2023)
In this case, the taxpayer built a new home and submitted a VAT reclaim of around £140,000. HMRC denied about half the claim, citing:
-
VAT was charged at the wrong rate (should’ve been zero-rated).
-
Some items were not “eligible materials” under the scheme.
Mr Mort appealed — and won back nearly £40,000 in VAT. Here’s what we can learn:
What the Tribunal Said: Lessons for DIY Builders
“Predominant Element” Test Matters
The tribunal decided that claims shouldn’t just hinge on whether installation was included, but rather what the invoice was mainly for in the eyes of the customer.
So if you bought and fitted a staircase, and most of the cost related to the staircase itself (the physical item), you can claim — even if installation was included.
Examples from the case:
| Item | Claimable? | Reason |
|---|---|---|
| Glass panels and shutters | ✅ Yes | Mostly materials, minimal install |
| Automated gates | ✅ Yes | Install < 25% of cost |
| Skirting, fire doors | ✅ Yes | “Materials only” on invoice |
| Staircase (with fitting) | ✅ Yes | Perceived as a material by customer |
| Garage door (with motor) | ✅ Yes | Install was minor |
| Tarmac driveway | ❌ No | Service was predominant |
| Steel roof beams (with install) | ❌ No | Mix of materials + services |
| Wooden flooring (fitted) | ❌ No | Installation seen as main value |
| Fitted wardrobes (£80k!) | ❌ No | Seen as luxury furniture, not “basic” |
This shows that how the invoice is worded, and what the customer is really paying for, can swing the case either way.
HMRC’s Stance: Criticised by the Tribunal
The tribunal noted that HMRC’s refusal to repay VAT — even when it knew the VAT shouldn’t have been charged at all — was “inherently unsatisfactory.” It’s worth pointing out:
“HMRC choose to… appeal before this Tribunal as a means of retaining a windfall that they accept they ought not have received.” – Tribunal Judge
But due to previous court rulings (Foulser v HMRC), the tribunal couldn’t force HMRC to repay wrongly charged VAT. So, while frustrating, the law still supports HMRC’s refusal — unless further changes come from appeals or new cases.
Practical Tips for a Successful Claim
Get itemised VAT invoices
Your name, full address of the property, and a clear breakdown of goods/services is vital.
Avoid “supply and install” wherever possible
Try to obtain invoices that show only material costs if you want to reclaim VAT.
Include everything in your initial claim
Use HMRC form VAT431NB or VAT431C, depending on whether you are building or converting. Supplementary claims may be allowed (e.g. retention payments, late invoices), but don’t rely on that.
Keep evidence of what was supplied
Photos, delivery notes, or manufacturer specs can help you prove that an invoice relates to construction materials.
Consult before you build
Having the right structure and suppliers from day one can prevent VAT issues later. We often help clients plan VAT alongside financing, grants, or CIS registration.
Final Thoughts
The VAT DIY Housebuilder Scheme is a valuable tool — but it’s tricky to navigate, and HMRC can be strict. The Mort case shows that tribunals may be sympathetic, especially where the buyer clearly paid for materials, even if the invoice includes some installation.
However, it’s vital to get your records, invoices, and wording right from the outset to reduce the chance of rejection.
Need Help with a VAT Claim?
Whether you’re halfway through a build or just getting started, Merranti Accounting can help you:
- Maximise your VAT refund on materials
- Prepare and submit your DIY claim correctly
- Dispute a rejected claim if needed
- Structure your project in the most tax-efficient way
