Renovations That Add the Most Property Value

Not all renovations are equal in terms of the value they add to a property. Some improvements — a new bathroom suite, for example — may cost £10,000 but add only £5,000 in value. Others — a loft conversion — might cost £40,000 and add £60,000. Understanding which renovations deliver genuine return on investment is essential for homeowners making spending decisions.

Extensions, loft conversions, and garage conversions consistently deliver the best returns — because they add liveable square footage, and UK properties are primarily valued on a per-square-metre basis. A loft conversion adding a double bedroom with en suite can add 15-25% to a property's value, often significantly exceeding its cost in areas with high property prices. The south east of England and London typically see the highest returns due to the premium on space.

Adding a bedroom through a loft conversion consistently ranks among the highest-returning home improvements in the UK, particularly in markets where property prices per square metre are high.

— RICS (Royal Institution of Chartered Surveyors)

A modern, well-specified kitchen is one of the most important factors in a buyer's assessment of a property. However, the return on kitchen investment varies widely — a £5,000 upgrade to an outdated kitchen typically returns far more proportionally than a £25,000 designer kitchen in a mid-range property. Bathrooms follow the same logic: a clean, modern, functional bathroom adds value; a second bathroom (particularly an en suite to the master bedroom) adds more.

Swimming pools, home cinemas, and highly personalised landscaping are among the improvements that frequently cost more than they add in value. So are full rewires and re-plumbing (buyers expect these to be in adequate condition but rarely pay a premium for them). Conservatories have a mixed track record — a high-quality orangery or fully insulated garden room adds more than a standard polycarbonate conservatory, which buyers often see as a cold, unusable space for much of the year.

There is growing evidence that EPC rating affects property value, particularly as buyers focus on running costs. A Rightmove study found that properties rated EPC A or B sell for around 1.7% more than equivalent EPC D properties. As mortgage lenders begin to offer green mortgages with preferential rates for higher EPC homes, the financial premium for energy efficiency is likely to increase.

• Loft conversion (add bedroom): +15-25% value, often 100%+ return on cost
• Single-storey extension: +10-15% value
• Garage conversion: +5-15% value
• New kitchen (mid-range): +5-10% value
• En suite bathroom: +5-10% value
• EPC improvement (D to C or B): +2-5% value