Updated October 2026
In short: A house that needs renovation can be the most cost-effective way to get the home you want in London, but only if the purchase price, works budget and end value line up. Kitchens, bathrooms, rewiring and heating are the usual essentials; extensions and lofts add space and value but need planning or permitted development checks.
Typical renovation jobs and what they add
| Work | Cost level | Value impact | Permissions |
|---|---|---|---|
| Rewire and new heating | Medium | Essential; makes the house mortgageable | Building regulations sign-off |
| New kitchen and bathrooms | Medium to high | Strong appeal to buyers and tenants | Usually none |
| Loft conversion | High | Adds a bedroom; often strong value uplift | Permitted development or planning; building regs |
| Rear or side extension | High | Bigger kitchen-living space | Permitted development, prior approval or planning |
| Damp, roof and structural repairs | Varies widely | Protects value rather than adding it | Building regs if structural |
| Energy improvements | Medium | Better EPC, lower bills, future-proofing | Usually none; check conservation areas |
Get itemised quotes; London labour costs vary by borough and contractor.
Run the numbers before you offer
Add the purchase price, stamp duty, fees, works, a contingency of 10–20%, finance and holding costs, and compare the total with realistic end values from recent sales on the street. If there isn't a comfortable margin, negotiate or walk away.
Before you buy
- RICS Level 3 survey and a builder's walk-round
- Planning history and conservation area or listed status
- Party wall implications for extensions
- Asbestos in older properties
- Mortgageability: you may need bridging or a refurbishment loan
How Fraser Bond helps
- Sourcing London houses that need work, including probate and off-market
- End value advice based on comparable evidence
- Introductions to architects, surveyors and builders
- Selling or letting once the renovation is complete
Looking for a London renovation project?
Tell us your budget and we'll find the right house.
Speak to our teamRelated guides
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