Is a Loft Conversion VAT Free in 2026? (UK)
No — a standard loft conversion on a UK home is not VAT-free in 2026. Full 20% VAT applies on labour and materials. The reduced 5% VAT rate only applies in specific cases: converting a property to change the number of dwellings (e.g. house into flats), or renovating a home that has been empty for at least 2 years. A normal loft conversion that adds a bedroom and ensuite to your existing home is standard-rated.
When the standard 20% VAT rate applies
The default position from HMRC is that improvements and extensions to existing dwellings are standard-rated at 20% VAT. A typical Velux, dormer, hip-to-gable or mansard loft conversion that adds bedrooms or a bathroom to an occupied home falls into this category. The builder must add 20% on labour and materials (unless they are not VAT-registered — only relevant for smaller traders under the £90,000 threshold).
When the reduced 5% VAT rate applies
HMRC Notice 708 sets out the cases where reduced-rate 5% VAT can apply to a loft conversion:
- Changed-number-of-dwellings conversion — e.g. converting a single house into multiple flats, or a flat into a house, where the loft works are part of that scheme.
- Empty home conversion — if the property has been continuously empty for 2 years or more before work starts, all qualifying construction services are at 5%.
- Mobility adaptations for a disabled occupant — specific qualifying works can be zero-rated.
What does NOT qualify
Adding a bedroom to your own occupied home, even if it transforms a derelict loft, does not qualify on its own. Splitting bills between standard- and reduced-rate works on the same property (e.g. 5% on the empty-home portion, 20% on the post-occupation extras) is allowed but rare and needs an experienced builder. The same standard-rate default applies to most projects covered in our home extension VAT guide.
Worked VAT examples on a loft conversion
The rate you pay follows what the work does to the building, not how big the job is. These worked examples show how similar building work can attract very different VAT depending on the circumstances. Figures are illustrative and exclude professional fees, which stay standard-rated.
Example 1: Standard dormer on an occupied home
You add a rear dormer loft conversion with a new bedroom and ensuite to the house you already live in. The whole job is standard-rated: £50,000 of qualifying work plus 20% VAT is £10,000, for a £60,000 total. This is the position for the large majority of UK loft conversions.
Example 2: House split into two flats
The loft works form part of converting one house into two self-contained flats — a change in the number of dwellings. The builder's qualifying labour and materials are reduced-rated at 5%, so £50,000 of work carries £2,500 VAT rather than £10,000 — a £7,500 saving against the standard rate. You would normally need building control sign-off and evidence of the changed dwelling count.
Example 3: Home empty for more than two years
You buy a house that has stood empty for over two years and convert the loft as part of bringing it back into use. Qualifying construction services are charged at 5%, provided you can show the two-year empty period (a council empty-property record or council tax letter is the usual evidence). Furniture, white goods and the architect's fees remain at 20%.
In every case the builder is responsible for applying the correct rate and can be assessed by HMRC if they get it wrong, so expect them to be cautious. Compare the pre-VAT figures in our loft conversion cost guide before you judge whether a quote's VAT looks right.
How to check your VAT position
1. Check the property type
Single-house loft conversions to an occupied home: standard rate. Conversion that changes dwelling count: reduced rate.
2. Check the empty-home rule
If the home was unoccupied for 2 years before work begins, the 5% rate can apply — ask the council for written confirmation.
3. Get the builder's VAT position in writing
Before signing, ask the builder for written confirmation of the VAT rate they will charge with reference to HMRC Notice 708.
4. Ask an accountant if in doubt
For change-of-dwelling schemes or self-build, a qualified accountant can advise on reclaim and zero-rated supplies.
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