Home improvement ROI calculator
How much value could an extension, loft conversion or new kitchen add to your property? Enter your current property value, the project cost and your estimated value uplift to see whether the numbers actually stack up.
The ROI on a home improvement project depends heavily on two things: the quality of the work and the local market. A beautifully finished kitchen in an area where buyers expect mid-range finishes will not add as much value as the same project in a premium postcode. Always get three quotes and check what similar improved properties are selling for nearby before committing to the budget.
Projects with the best ROI
Loft conversions, kitchen extensions and adding a bedroom consistently return the most value relative to cost. Cosmetic updates tend to return less but cost far less too. Garden landscaping has variable ROI depending on the buyer market in your area.
Planning permission
Extensions above a certain size and loft conversions that alter the roofline usually need planning permission. Budget 8 to 12 weeks for the process and allow for the possibility of conditions being attached. Factor this into your project timeline before you start.
Improving to sell vs improving to stay
If you plan to stay for 10 or more years, ROI matters less than whether you will enjoy the improvement. If you are improving to sell within 2 to 3 years, focus on what buyers in your area actually want rather than personal preference.
Over-improving your area
There is a ceiling on what buyers will pay in any given street. If your property is already near the top of the local range, even a well-executed improvement may not add the value you expect because buyers will not pay significantly above comparable properties nearby.
Please note: Value uplift estimates are illustrative and based on general UK market averages. Actual increases in property value will depend on location, local market conditions, quality of work, planning constraints and buyer demand. This calculator is for guidance only and does not constitute financial or surveying advice. Always seek a professional valuation before making major investment decisions.
What is home improvement ROI?
Return on investment (ROI) for home improvements compares the estimated increase in property value against the cost of the project. A project with a positive ROI adds more value than it costs; a project with a negative ROI costs more than it adds.
Not all home improvements increase property value proportionally. An extension in a high-value area may add significantly more than its cost; redecorating in a market-value property may add little or nothing above the cost. Understanding ROI before committing to a project changes the decision about which projects to prioritise.
How to use this calculator
Project cost: The total cost of the improvement, including materials, labour, planning fees and any fixtures.
Estimated value added: Your estimate of the increase in property value from the project. This is the hardest input to estimate accurately – consult local estate agents for an opinion on value-added for specific project types in your area.
Current property value: Your estimate of the current market value before the improvement.
Reading the result: The calculator shows the ROI percentage and the net gain or loss relative to cost. It also shows the new estimated property value and the new LTV if you have a mortgage – useful for understanding whether the improvement brings you into a better mortgage rate tier.
Which improvements typically have the best ROI?
High ROI improvements (often above 100% of cost recovered):
- Loft conversions (adding a bedroom in undersupplied areas)
- Single-storey kitchen extensions
- Converting a garage to a habitable space
- Adding a bathroom
Medium ROI improvements:
- Kitchen and bathroom refurbishments
- Central heating installation
- Driveway and kerb appeal improvements
Low ROI improvements (often below cost recovered):
- Swimming pools (add value only in specific markets)
- Highly personalised or luxury finishes that limit buyer appeal
- Over-improving relative to comparable properties in the area
The information on this site is for educational and informational purposes only. Nothing on Be More Peter constitutes financial advice, and nothing should be treated as such. The calculators, articles and tools on this site are designed to help you understand financial concepts and run indicative numbers - they are not a substitute for professional advice tailored to your specific circumstances. Before making any financial decision - including decisions about mortgages, pensions, investments, savings or insurance — you should seek independent financial advice from a qualified adviser who is authorised and regulated by the Financial Conduct Authority (FCA). Calculator results are estimates based on the information you enter and the assumptions built into the tool. They are illustrative only and should not be relied upon as accurate projections. Rates, thresholds and rules change regularly - always verify figures with an appropriate professional or official source before acting on them. Be More Peter is not authorised or regulated by the FCA. The content on this site does not constitute a financial promotion.
Related tools and posts
- Home improvement loan calculator — the cost of financing
- Extension cost calculator — estimate the project cost
- LTV calculator — your equity position after improvements
- Remortgage calculator — releasing equity after improvements