Renovation Cost Calculator
Get a personalised ballpark estimate for your London renovation in under 60 seconds. Select your project type, property details and specification level.
What type of project?
Select the renovation that best describes your project.
Project Details
Tell us about your property and project size.
Specification Level
Choose the finish level that matches your vision.
Quality materials, clean contemporary finish
Designer fixtures, engineered oak, stone surfaces
Bespoke joinery, Carrara marble, smart home integration
How London Renovation Costs Compare
Our published figures where we have them, and what sets the cost of the rest. Every project gets a fixed-price quotation once it has been surveyed or designed.
| Project Type | Cost guide | ||
|---|---|---|---|
| Loft Conversion | Depends on the type of conversion, the size of the loft and the roof structure. | ||
| House Extension | Depends on the extension type (side-return, rear, wraparound or double-storey), its size and the design. | ||
| Kitchen Renovation | Depends on whether walls or services move, and on the cabinetry, worktops and appliances. | ||
| Bathroom Renovation | Typically £10,000–£30,000 excluding VAT. | ||
| Basement Conversion | Depends on whether a cellar is converted or a new level is dug, and on the soil, engineering and finish. | ||
| Full Refurbishment | Scope-based: cosmetic £650–£1,250/m²; back-to-brick £2,250–£3,250/m²; full flat £900–£1,700/m². No additional finish-tier uplift. | ||
Use your estimate to plan the next step
Use the calculator result as early planning guidance rather than a fixed quotation. A realistic budget depends on the property, scope, specification, structural work, services upgrades, access, planning or building-control risk and the finish level you want to achieve. The same headline estimate can mean different decisions for a house refurbishment, flat refurbishment, house extension or basement conversion, particularly where hidden fabric, drainage, party-wall matters or staged access affect sequencing and risk.
Hampstead Renovations can review the result with you, identify likely cost drivers and turn it into a practical brief for design, procurement and delivery. This helps separate essential works from optional upgrades before the budget is treated as a commitment. That review can also highlight where a phased scope, different specification level or earlier planning advice could change priorities before commitments are made. If your project includes a kitchen renovation, bathroom renovation or planning-sensitive work, we can explain what should be checked before drawings, specifications and contractor pricing are developed. For a project-specific review, contact the team with the property type, intended scope and any constraints you already know.
Renovation Cost FAQs
Answers to the most common questions about renovation costs in London.
Discuss your project
Tell us what you are planning
Share the property location, the work you have in mind and any drawings or permissions you already have.
£5M public liability, £10M employers' liability and contractors' all risks cover.
Design support: Hampstead Architecture & Planning.
Surveying support: Hampstead Chartered Surveyors.
Completed renovation project examples
