Tax Benefits for Home Improvement Projects Explained
Last Updated: November 4, 2026
Quick Summary
Most home improvements are not tax deductible in the UK, but tax benefits for home improvement projects do exist in specific areas: Capital Gains Tax cost base, rental property accounts, working from home claims and energy-saving schemes. Repairs are deductible against rental income now, while improvements feed into your cost base and are claimed on sale.
Capital improvements add to your cost base and reduce Capital Gains Tax, but only when you sell.
Repairs are deductible against rental income in the year you spend the money; improvements are not.
Ask your builder to itemise repair work separately from improvement work on one invoice.
Working from home relief does not cover building work such as converting a spare room into an office.
Energy schemes like ECO and the Boiler Upgrade Scheme are grants, not tax relief, so they cut the cost of the work.
Table of Contents
Are Home Improvements Tax Deductible in the UK?
Most home improvements are not tax deductible in the UK. HMRC generally treats spending on your own home as personal, not business, so there is no general relief for a new kitchen or a loft conversion.
But the picture is not quite that simple. Tax benefits for home improvement projects do exist, and they sit in specific corners of the system: Capital Gains Tax, rental property accounts, working from home claims, and energy-saving schemes.
The key is knowing what kind of spending you are doing.
Deductions, Reliefs and Credits: What Each One Actually Does
A tax deduction reduces your taxable income, so you pay less tax on what is left. A tax relief works in a similar way but is usually tied to a specific activity, such as pension contributions or business expenses. A tax credit is different again: it comes off your tax bill directly.
Here is how that plays out for property:
Deduction: rental repairs and certain running costs reduce your rental profit
Relief: working from home allowances reduce taxable income for the self-employed
Credit: energy-saving schemes have historically offered grants rather than tax credits, so check current eligibility before assuming
Watch out: people often assume a deduction is worth the full amount spent. It is not. A deduction only saves you your marginal rate on that sum, which is a much smaller number.
Capital Gains Tax Home Improvements and Your Cost Base
Capital improvements can cut your Capital Gains Tax bill, but only when you sell. The mechanism is your cost base: the figure HMRC uses to work out your gain. Add the cost of qualifying improvements to what you originally paid, and your taxable gain shrinks.
Private Residence Relief usually covers the whole gain on your main home, so this matters most for second homes, rental properties and buy-to-lets. According to HMRC guidance on Capital Gains Tax for property, you must keep records of improvement costs to support the figure you declare.
What Counts as a Capital Improvement
A capital improvement is work that adds lasting value to the property or changes its structure. It is not a repair.
Extensions and loft conversions
New bathrooms or kitchens where none existed before
Structural work, damp proofing, rewiring
Insulation and double glazing
Landscaping that forms part of the property
Replacing a worn-out boiler with a like-for-like model is a repair. Upgrading to a more efficient system can be argued as an improvement, but keep the paperwork either way.
Landlord Repairs Versus Improvements Tax Treatment
Landlords get the clearest tax benefits for home improvement projects of anyone, but the rules split sharply.
Toby Mathis Esq | Tax Planning & Asset Protection
So a leaking roof repaired is deductible now. According to gov.uk guidance on property income allowances, replacing fixtures counts as a repair, while upgrading them counts as an improvement.
The trap is mixing the two on one invoice. Ask your builder to itemise repair work separately from improvement work, or you risk losing the deduction entirely.
The tax treatment splits sharply depending on whether the spending is a repair or an improvement.
Spending type | Tax treatment | When it applies |
Repairs | Deductible against rental income | In the year you spend the money |
Improvements | Feeds into cost base for Capital Gains Tax | Claimed on sale |
Replacing fixtures | Counts as a repair | Deductible now |
Upgrading fixtures | Counts as an improvement | Capital, claimed on sale |
Mixed invoice | Itemise repairs separately from improvements | Or risk losing the deduction entirely |
Working From Home Tax Relief and Home Office Claims
Working from home relief exists, but it does not cover building work. If you are employed, you may be able to claim a flat allowance for household costs like heating and electricity.
What you cannot do is deduct the cost of converting a spare room into an office. That is a home improvement, and it stays personal.
A common mistake is claiming a bigger proportion of the home than is genuinely used for work. Keep the claim realistic and documented.
Energy-Efficient Upgrades and Renewable Energy Equipment
Energy-efficient improvements are the one area where tax benefits for home improvement projects are most likely to apply to an ordinary homeowner, but the landscape shifts constantly. Schemes open, close and change eligibility mid-year, so treat any figure below as a starting point and confirm the current position on government guidance on energy efficiency grants before you commit to a specification.
The main schemes and how they work
Energy Company Obligation (ECO): funded by energy suppliers and delivered through installers, ECO supports insulation, heating upgrades and some glazing for households that meet eligibility criteria. It is a grant, not a tax relief, so it reduces the cost of the work rather than your tax bill. Eligibility is usually tied to benefits receipt or a low income, and the property must meet minimum energy performance requirements.
Boiler Upgrade Scheme: provides a fixed grant towards the cost of replacing a fossil-fuel heating system with a heat pump or, in limited circumstances, a biomass boiler. The grant is paid to the installer and deducted from your quote. The property must have a valid Energy Performance Certificate with no outstanding recommendations for loft or cavity wall insulation, and the installer must be MCS-certified.
Great British Insulation Scheme: targets the least energy-efficient homes, typically those in Council Tax bands A to D in England and equivalent bands in Scotland and Wales, and supports cavity wall, loft and solid wall insulation. Delivery is through suppliers and installers rather than a direct claim.
VAT relief on energy-saving materials: this is the quietest benefit and the one most often missed. The relief applies to the installation as well as the materials when supplied by the same installer, so a single itemised invoice from a VAT-registered installer is worth more than splitting the job between suppliers.
What does not qualify
Battery storage added to an existing solar array is not automatically covered by the reduced VAT rate; check the current scope before assuming.
Cosmetic upgrades such as new windows that do not meet the energy-efficiency threshold are standard-rated.
DIY installation does not attract the same relief as installation by a qualifying tradesperson.
Project-by-project eligibility checklist
Before you sign a quote, work through this list:
Confirm the property's current EPC rating and any outstanding insulation recommendations
Check whether the installer is MCS-certified or registered with the relevant scheme
Confirm the equipment appears on the current eligible list for the scheme you are using
Check whether the grant is paid to you or deducted from the installer's invoice
Confirm the VAT rate being applied and ask for it to be shown separately on the quote
Keep the EPC, the installer's certification and the itemised invoice together
How the savings actually compare
A grant reduces the capital cost of the work; VAT relief reduces the amount of tax charged on the installation; neither reduces your income tax bill. A common pattern is for homeowners to overestimate the tax angle and underestimate the bill savings.
Worked example
Take a semi-detached home in Council Tax band C with a heat pump installation quoted at £12,000. If the Boiler Upgrade Scheme grant applies, the installer deducts the grant from the quote. If the installer is VAT-registered and the installation qualifies for the reduced rate, VAT is charged at 5% rather than 20% on the qualifying elements. The combined effect is a lower upfront cost, but the homeowner's income tax position is unchanged.
Combining incentives
Grants and VAT relief can usually be combined because they operate at different points in the transaction. Rebates from an energy supplier may reduce the eligible cost for a grant, so declare them.
For most homeowners, energy upgrades are better viewed as a way to reduce bills than as a tax measure. If you are weighing up solar, our guide on whether solar panels need planning permission covers the permission side before you commit.
Records, Receipts and Keeping Your Claim Intact
Documentation is where most claims quietly fail. HMRC does not accept estimates. It wants receipts, invoices and a clear link between the spending and the property.
Keep every invoice, not just the totals
Note the date, amount and what the work covered
Separate repairs from improvements on the paperwork
Store it digitally and back it up
Keep records for the required period after the tax year
Hidden costs are the other thing to track. Our guides on hidden costs in home renovation projects and hidden costs of residential building projects explain the extras that catch people out, and those extras belong in your records too.
Planning Your Project With Tax in Mind
The smartest move is to plan the tax question before the design is fixed, not after the build is finished. If you are extending, our guide on how to manage an extension budget pairs well with this, and if funding is the sticking point, seven ways to finance a home extension project covers your options.
At Sd Architecture, we handle planning permissions, building regulations and turn-key project delivery from concept to completion. That matters when you later need to prove what was built and what it cost.
The challenge is simple: most homeowners only discover which tax benefits for home improvement projects apply to them after the money is spent. Get the advice early, keep every receipt, and the savings stay available.
Get started with Sd Architecture and build with a clear record from the first drawing.
Frequently Asked Questions
Are home improvements tax-deductible in the UK?
For most homeowners, no. There is no general home improvement tax deduction against income for work on your main residence. The benefit usually arrives elsewhere: capital improvement costs can reduce a Capital Gains Tax bill when you sell, and certain energy-saving or renewable installations may qualify for relief. Landlords and people running a business from home face different rules. Keep every invoice either way, because the paperwork is what turns an eligible cost into a real saving.
Do home improvements affect Capital Gains Tax when I sell my property?
They can. Qualifying capital improvements are added to your allowable costs, which reduces the gain and therefore the tax due. Private Residence Relief usually covers the main home in full, so the effect matters most on second homes, buy-to-let property and homes that were let out for part of the ownership period. Only improvements count, not repairs or maintenance, and you need receipts to support the figure you claim.
Can landlords claim tax relief on repairs and improvements?
Repairs and improvements are treated differently. Replacing a broken boiler or repainting a rental flat is normally allowable as a revenue expense against rental income. A new extension or a full kitchen upgrade counts as a capital improvement, so it is not deducted in the year you spend the money. Instead it feeds into your cost base for Capital Gains Tax when the property is sold. Mixing the two in one invoice is a common mistake, so ask your builder to itemise.
What records should I keep for renovation costs?
Keep every invoice, contract, receipt and bank statement tied to the project, plus planning permission and Building Regulations approval documents. Note what each cost was for, because a £4,000 invoice covering both a repair and an improvement needs splitting. Store copies digitally and keep them for at least six years after the relevant tax year, longer if the property is likely to be sold. Your architect's fee schedule and stage payment records are useful here too.
Comments