Costs

VAT on Building Work: When Is It 5% and When Is It 20%?

By John · 6 March 2026

VAT Rates on Building Work

VAT on Building Work: When Is It 5% and When Is It 20%? matters most when a homeowner is close to making a decision and does not want a vague quote, soft assumption, or missing line item to become an expensive problem later.

Standard Rate (20%)

Most extension work:

New build extensions.
Loft conversions.
General renovation.
Kitchen/bathroom fitting.

Reduced Rate (5%)

Qualifies if:

Property empty 2+ years before work.
Conversion to different dwelling type.
Renovating for disabled person.
Installing energy-saving materials.

Zero Rate (0%)

Rare for extensions:

New build dwellings (not extensions).
Approved alterations to listed buildings.

The 2-Year Rule

If your property has been empty for 2+ years, renovation work may qualify for 5% VAT.

What counts as 'empty':

No one living there.
Not used for any purpose.
2 continuous years minimum.

Evidence needed:

Council tax records.
Utility bills showing minimal usage.
Statutory declaration.

Listed Buildings

Approved alterations to listed buildings can be zero-rated. But:

Must have listed building consent.
Must alter the fabric, not just repair.
Complex rules — get advice.

Don't Get Caught Out

Builders should charge correct VAT. If they charge 20% on 5% work, you overpay. If they charge 5% wrongly, HMRC can pursue YOU for the difference.

What To Do

1. Ask your builder about VAT rate. 2. Check if any reduced rates apply. 3. Get the VAT treatment in writing. 4. Keep evidence of property status.

---

Not sure about VAT on your project? [Get an independent review](/#get-started) from The Building Guys.

Next Step

If you want help applying this to your own project, use the right route below.

Start with [Quick Review](/quick-review) if you want a fast first check.
Use [Builder Quote Review](/builder-quote-review) if you already have a quote in hand.
See the [Sample Report](/sample-report) if you want proof before you buy.

Frequently Asked Questions

Why does VAT on building work matter so much?

Because VAT on building work often sits right at the point where money, scope, and risk meet. If the paperwork is vague here, homeowners usually discover the problem after they have already committed.

Should I ask the builder more questions before I agree?

Yes. Clear builders should be able to explain what is included, what is excluded, and what assumptions sit behind the price.

Is a quick review enough?

Sometimes, yes. If you only need a first sense-check, start with [Quick Review](/quick-review). If you already have a proper quote or more serious concern, use [Builder Quote Review](/builder-quote-review).

What if I want proof before I buy?

Look at the [Sample Report](/sample-report). It shows the kind of clear, practical output we are aiming to give homeowners before they sign anything.

Practical Questions to Ask Before You Commit

When homeowners are dealing with VAT on building work, the safest move is usually to slow the decision down and ask a few direct questions in writing.

What exactly is included in the current price?
What assumptions are being made that could change later?
Which items are still provisional, estimated, or allowance-based?
What would trigger a variation or extra cost?
What needs clarifying before any deposit or approval is given?

Short questions like these often reveal whether the paperwork is genuinely solid or simply looks tidy at first glance.

The Safer Way to Use This Advice

Use this article as a filter, not as a substitute for proper review. If the issue still feels unclear after reading, that is usually the sign that a real second opinion is worth getting.

A Final Word on Vat On Building Work

Vat On Building Work is worth checking before you commit.
A weak decision around VAT on building work usually gets more expensive later.
Clear paperwork around VAT on building work protects the homeowner, not just the builder.