The single most important thing to know this is a capital allowance, not a grant
The UK government does not offer direct grants for energy efficiency upgrades on buy-to-let (BTL) properties in 2026. Instead, BTL landlords can claim tax relief through the “Landlords’ Energy Saving Allowance” (LESA), which is a capital allowance, not a cash payment.
BTL landlords can claim up to £1,500 per qualifying energy item through the Landlords' Energy Saving Allowance (LESA). This is a capital allowance, not a grant, and covers loft insulation, cavity wall insulation, and draught-proofing, but not solar panels or heat pumps in 2026.
- Claim up to £1,500 per qualifying energy item per property.
- LESA is a capital allowance, not a cash grant.
- Qualifying items include loft, cavity, and solid wall insulation.
- Solar panels and heat pumps are not covered by LESA in 2026.
- Installation labour costs are included in the claim.
- The single most important thing to know this is a capital allowance, not a grant
- Who qualifies for the relief you must be a landlord of a residential property
- Which upgrades qualify only specific energy-saving items listed by HMRC
- Quick numbers the cap, the savings, and the deadline
- How to verify your installer MCS certification matters for some upgrades, but not for LESA
- The direct answer to "btl tax relief upgrades" you can claim up to £1,500 per qualifying energy-saving item per property per year as a tax deduction
- How to confirm your eligibility and claim the relief
LESA allows you to deduct the full cost of qualifying energy-saving improvements from your rental income before calculating tax. This relief is only available for properties in England, Wales, and Scotland; Northern Ireland has separate arrangements under the Energy Efficiency (Private Rented Sector) Regulations (GOV.UK, 2026).
Who qualifies for the relief you must be a landlord of a residential property
You must own a property that is let as a dwelling, meaning a buy-to-let property, not a holiday let or commercial property. The property must be in the UK, specifically England, Wales, or Scotland.
You must be the landlord and have incurred the cost of the improvement yourself. The relief is not available if the tenant or a third party pays. The relief applies to capital expenditure on energy-saving items, not to repairs or maintenance, which may be deductible under different rules (HMRC, 2026).
Which upgrades qualify only specific energy-saving items listed by HMRC
Qualifying items are loft insulation, cavity wall insulation, solid wall insulation, floor insulation, draught-proofing, hot water tank insulation, and heating controls including smart thermostats. Solar panels, heat pumps, and other renewable technologies are not covered by LESA in 2026. These may fall under different capital allowance rules, such as the Structures and Buildings Allowance or Enhanced Capital Allowances.
The upgrade must be installed in the property. The cost of installation labour is included in the claim. The relief is capped at £1,500 per property per qualifying item per year. For example, you could claim £1,500 for loft insulation and another £1,500 for cavity wall insulation separately (HMRC LESA guidance, 2026).
Quick numbers the cap, the savings, and the deadline
| Item | Value | Source |
|---|---|---|
| Maximum claim per qualifying item per property | £1,500 | HMRC LESA guidance |
| Number of separate qualifying items you can claim for | Unlimited (each up to £1,500) | HMRC LESA guidance |
| Typical annual tax saving at 20% basic rate (claiming full £1,500 on one item) | £300 | Calculated from HMRC rate (20%) |
| Typical annual tax saving at 40% higher rate (claiming full £1,500 on one item) | £600 | Calculated from HMRC rate (40%) |
| Deadline to install and claim for the 2025/26 tax year | 5 April 2026 | HMRC tax year rules |
These figures assume you have sufficient rental income to offset the allowance against. If your rental income is lower than the allowance, you cannot claim a refund for the difference.
How to verify your installer MCS certification matters for some upgrades, but not for LESA
LESA does not require the installer to hold any specific certification, such as MCS, TrustMark, or Gas Safe, for the relief to apply. However, for building regulations compliance, certain upgrades must be installed by a certified installer registered with a Competent Persons Scheme. For example, solid wall insulation may require a certified installer, and gas heating work must be done by a Gas Safe Register engineer.
For renewable technologies like heat pumps and solar panels, which are not covered by LESA, MCS certification is required to qualify for the Boiler Upgrade Scheme, which is a grant, not tax relief (MCS Service Company, 2026). To check an installer’s credentials, use the TrustMark website or the MCS Installer Database (TrustMark, 2026).
The direct answer to “btl tax relief upgrades” you can claim up to £1,500 per qualifying energy-saving item per property per year as a tax deduction
The relief is a capital allowance, not a grant, and you claim it on your Self Assessment tax return. There is no cap on the number of properties you can claim for, as long as each property is a qualifying BTL dwelling. You cannot carry forward unused relief, so claim in the year the expenditure was incurred.
If you are a higher-rate taxpayer, the relief reduces your tax bill at 40%, or 45% for additional-rate payers. For example, if you spend £1,500 on cavity wall insulation and are a 40% taxpayer, your tax bill reduces by £600 (HMRC LESA guidance, 2026).
How to confirm your eligibility and claim the relief
Step 1: Check your property meets the definition of a “dwelling” and is not a holiday let or commercial property. Step 2: Identify which energy-saving items you have installed, using only those on the HMRC list. Step 3: Keep receipts, invoices, and proof of payment for the installation.
Step 4: Claim the relief in your Self Assessment tax return for the tax year in which the expenditure was incurred. For the 2025/26 tax year, the return is due by 31 January 2027. Step 5: If you are unsure, use HMRC’s online “Check if you can claim LESA” tool or contact the HMRC helpline for landlords (HMRC Self Assessment, 2026).
how to claim capital allowances on rental property
Frequently Asked Questions
The Landlords' Energy Saving Allowance (LESA) lets you deduct up to £1,500 per qualifying item from rental income before tax. It is a capital allowance, not a grant, as confirmed by HMRC in 2026.
You can claim up to £1,500 per qualifying energy-saving item per property per year. This includes loft insulation, cavity wall insulation, and draught-proofing, according to HMRC rules.
No, solar panels are not covered by LESA in 2026. They may qualify under different capital allowance rules, such as the Structures and Buildings Allowance, as per GOV.UK guidance.
You qualify if you are a landlord of a residential buy-to-let property in England, Wales, or Scotland. The property must be let as a dwelling, not a holiday let or commercial property, per HMRC.
Yes, the cost of installation labour is included in the LESA claim. The total claim is capped at £1,500 per qualifying item per property per year, as stated by HMRC.
