Calculate the return on investment for home improvements by weighing renovation costs against the likely uplift in property value.
What the property is worth before the work
Total cost of the project, including materials and labour
What a surveyor or agent estimates it'll be worth once finished
Return on investment
60%
The renovation is expected to pay for itself and more
This result is an estimate only and does not constitute financial advice.
Net gain
£15,000
Value added minus the renovation cost
This result is an estimate only and does not constitute financial advice.
Value added
£40,000
This result is an estimate only and does not constitute financial advice.
Break-even value
£275,000
What the property needs to be worth to cover its cost
This result is an estimate only and does not constitute financial advice.
Not every improvement adds more value than it costs. This calculator compares what you'd spend on a project against the uplift in property value it's expected to create, giving you a return on investment figure you can use to compare different projects, or decide whether a renovation is worth doing at all.
A positive ROI means the value added is expected to exceed the cost — a 60% ROI means that for every £1 spent, you'd expect to get back £1.60 in added value. A figure below 0% means the project is expected to cost more than it adds to the property 's value, which can still be worth doing for your own enjoyment, just not as a purely financial decision.
Some improvements, like adding a bedroom through a loft conversion or extension, tend to add reliable value. Others, like a very high-spec kitchen in a modest area, can cost far more than local buyers are willing to pay extra for. Getting a realistic estimate of the value after renovation, ideally from a local agent or surveyor, is the most important number in this calculation.
Projects that add usable space, like loft conversions, extensions and converting a garage, tend to offer the most reliable returns because they increase the number of bedrooms or the overall floor area. Kitchen and bathroom updates can also pay off well if the existing ones are dated, but very high-spec finishes often cost more than local buyers will pay extra for.
The most reliable approach is to ask a local estate agent or surveyor who knows the area, ideally by comparing recently sold prices of similar properties nearby that already have the feature you're adding. Online valuation tools can give a rough starting point but rarely account for a specific renovation.
No, it only compares the renovation cost against the value it's expected to add. If you're planning to sell shortly after finishing the work, remember to also budget for estate agent fees, conveyancing and any Capital Gains Tax due, which will reduce your actual return.
Not necessarily — this calculator measures the financial return only. Many renovations are worth doing for comfort, energy efficiency or making a home suitable for your family, even if they don't fully pay for themselves in added value when you come to sell.
Compare renovation quotes from vetted tradespeople to firm up your cost estimate.