Understanding VAT on Building Work in the UK
Introduction
VAT on building work is a topic that confuses many homeowners — partly because the rules aren't uniform. Different types of construction work attract different VAT rates, and understanding which applies to your project matters when you're comparing quotes and planning your budget.
This guide is a plain-English overview of VAT on construction work. It is not tax advice. If you have a specific query about VAT on your project, speak to a tax professional.
The Standard Rate (20%)
Most construction work carried out for homeowners is subject to VAT at the standard rate of 20%. This includes:
- Extensions and loft conversions to existing dwellings
- Refurbishments and alterations to existing homes
- Repairs and maintenance work
- Kitchen and bathroom installations
If you receive a quote for a home extension, you should expect VAT at 20% to apply. Make sure your quote is clear about whether prices are quoted inclusive or exclusive of VAT — the difference matters significantly on a large project.
The Zero Rate (0%)
A 0% VAT rate applies in certain specific circumstances related to construction. The main ones relevant to residential projects are:
New builds. The construction of a new residential dwelling (a completely new house or flat) is zero-rated for VAT purposes. If you are having a new house built, the construction services will typically be zero-rated.
Conversion of a non-residential building into a dwelling. Converting a redundant barn, office, or commercial building into a home may qualify for zero-rating.
First-time installation of building services in a new build. Electrical installations, plumbing, heating, etc., installed as part of a new build project may be zero-rated as part of the broader new build.
Note: extensions to existing homes are not zero-rated, even if they add substantial new living space. The zero rate applies to the creation of new dwellings, not to extensions of existing ones.
The Reduced Rate (5%)
A 5% reduced rate applies in certain construction circumstances:
Renovation of an empty residential property. If a property has been empty for two or more years, renovation works may qualify for the 5% reduced rate.
Changing the number of dwellings. Where a building is converted from one dwelling to multiple dwellings, or vice versa, the 5% rate may apply to the conversion works.
Installation of certain energy-saving materials. The installation of qualifying energy-saving products in residential buildings may benefit from the 5% reduced rate.
These reduced rates have specific qualifying conditions. Always check with a tax professional before assuming they apply to your project.
What Homeowners Should Watch For in Quotes
When reviewing contractor quotes, check:
Whether the quote is ex-VAT or inc-VAT. A quote of £100,000 + VAT is actually £120,000. Always understand which you're comparing.
Whether the VAT rate assumed is correct. For a standard home extension, 20% is the expected rate. If a contractor quotes with a reduced rate and you're not confident it applies, check before you commit.
Whether materials are included or excluded. For client-supplied materials — which is RCB's standard position — the VAT position may differ from contractor-supplied materials, as the client pays VAT directly to the supplier.
VAT Registration Threshold
At the time of writing, the VAT registration threshold for UK businesses is £90,000 per annum. Contractors with turnover below this threshold are not required to register for VAT and may not charge it. This can sometimes make smaller contractors appear cheaper on a VAT-exclusive comparison — but it's worth understanding whether the lower rate reflects a genuine difference in cost or simply VAT registration status.
Note: This blog post provides general guidance only and does not constitute tax advice. The VAT rules on construction are complex and subject to change. If you have a specific VAT query relating to your project, please consult a qualified tax adviser or HMRC's official guidance.
Planning a project and want to understand the commercial basis clearly?
Contact RCB Design & Build. We provide transparent, itemised quotes with VAT treatment clearly stated.
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