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 qualified tax adviser.
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, and kitchen and bathroom installations. If you receive a quote for a home extension, 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. The main ones relevant to residential projects are: the construction of a new residential dwelling (a completely new house or flat is zero-rated for VAT purposes); the conversion of a non-residential building into a dwelling (converting a redundant barn, office, or commercial building into a home may qualify); and first-time installation of building services in a 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 circumstances: renovation of an empty residential property (if a property has been empty for two or more years, renovation works may qualify); changing the number of dwellings (where a building is converted from one dwelling to multiple dwellings, or vice versa); and installation of certain qualifying energy-saving materials in residential buildings. 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); and 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
Contractors with turnover below the VAT registration 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 post provides general guidance only and does not constitute tax advice. VAT rules on construction are complex and subject to change. Please consult a qualified tax adviser or HMRC's official guidance for specific queries. Contact RCB Design & Build for transparent, itemised quotes with VAT treatment clearly stated.