No, windows and doors are not tax deductible for the majority of UK homeowners. HMRC does not allow a deduction against income tax or VAT for standard replacement windows or doors installed in your own home (HMRC, 2026).
The tax treatment depends entirely on whether the property is your main residence, a buy-to-let investment, or a business premises. For owner-occupied homes, the cost is considered a capital improvement, not an allowable expense. For landlords, different rules apply under property income tax, while businesses may claim capital allowances.
Owner-occupied homes have no tax relief
If you live in the property, replacing windows and doors is a personal expense. HMRC does not permit a deduction against your income tax, and you cannot claim VAT back on the installation. The standard VAT rate of 20% applies to most window and door installations in homes (GOV.UK, 2026). The only exception is for listed buildings or properties in conservation areas where planning permission is required, but this does not create a tax deduction, it simply means the work may qualify for reduced VAT of 5% under the Listed Places of Worship scheme.
Landlords can claim as a repair or improvement
For buy-to-let landlords, windows and doors are treated as a capital improvement, not a repair. You cannot deduct the full cost as an expense against rental income in the year of installation. Instead, the cost is added to the property’s base cost for Capital Gains Tax purposes when you sell. However, if the work is a genuine repair, like replacing a single broken pane, it may be deductible as a revenue expense (HMRC Property Income Manual, 2026).
Business premises qualify for capital allowances
If you install windows and doors in a commercial property you own or lease for business use, you may claim capital allowances. The cost qualifies as plant and machinery under the Annual Investment Allowance (AIA), which allows 100% relief on the first £1 million of qualifying expenditure until March 2027 (GOV.UK, 2026). This means the full cost can be deducted from your business profits in the year of purchase. Energy-efficient windows may also qualify for Enhanced Capital Allowances if they meet specific criteria.
A worked example
Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). The Energy Saving Trust estimates this upgrade cuts heating bills by roughly £235 per year on a gas-heated home, reducing heat loss through the fabric by up to 18%. If you are eligible for ECO4 funding through a government energy supplier obligation, you could receive up to £10,000 towards the cost, effectively covering the entire installation. Without a grant, the simple payback period is about 36 years based on annual savings alone. Over a 25-year lifetime for the windows and doors, total savings reach roughly £5,875 at current energy prices, though comfort gains and reduced condensation add significant non-financial value.
| Item | Figure |
|---|---|
| Upfront cost after grants | £8,500 |
| Yearly savings | £235 |
| Payback period | 36 years |
| 25-year lifetime savings | £5,875 |
What homeowners often get wrong
The most common mistake is assuming that energy-efficient home improvements automatically qualify for a tax deduction against your personal income. Here are the three biggest misconceptions we see from UK homeowners.
- Believing windows are an allowable expense for income tax HMRC treats replacement windows in your own home as a capital improvement, not a repair or maintenance cost. You cannot deduct the cost from your earned income or self-employment earnings, and claiming it incorrectly could trigger an HMRC enquiry.
- Thinking you can reclaim VAT on the installation The 20% VAT on window and door installation is not reclaimable for owner-occupied homes under any scheme. The only exception is a reduced 5% rate for listed buildings under the Listed Places of Worship scheme, but this is a VAT discount at the point of sale, not a tax deduction.
- Confusing capital allowances with personal tax relief Businesses can claim capital allowances on commercial property windows, but this does not apply to your home. Landlords also cannot claim windows as a repair expense, HMRC classes them as capital improvements, meaning the cost is added to the property’s base cost for capital gains tax purposes rather than deducted from rental income.
Quick reference
- Owner-occupied homes cannot claim any tax deduction for windows or doors against income tax or self-assessment.
- The standard VAT rate on window and door installation in UK homes is 20%, with no reclaim option for homeowners.
- Landlords must treat replacement windows as a capital improvement, not a repair, under HMRC property income rules.
- Businesses may claim capital allowances on windows and doors in commercial premises under the Annual Investment Allowance.
- ECO4 grants can fund full window and door replacements for eligible low-income households, covering costs up to £10,000.
Frequently Asked Questions
No, you cannot claim VAT back on new windows for your own home.Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6).
No, landlords cannot deduct the full cost of new windows as an expense. HMRC treats them as capital improvements, added to the property's base cost for Capital Gains Tax purposes.
No, double glazed windows do not reduce your income tax. Energy Saving Trust notes they improve efficiency but offer no direct tax relief for homeowners.
