House Renovation Cost Guide
2026 London House Renovation & Extension Cost Guide
Clear price ranges, architectural expertise, and fixed-cost proposals for high-end London homes.
- ✓ RIBA-Led Practice: Full architectural design, structural engineering, and planning management.
- ✓ Fixed-Cost Proposals: Detailed, itemised budgets before construction starts.
- ✓ 10-Year Guarantee: Comprehensive insurance-backed structural protection.
Estimated Cost Guidance
Average baseline costs for residential property renovations across London and the Home Counties:
| Renovation Type | Project Scope | Estimated Price Range |
|---|---|---|
| Ground Floor Extension | Single-storey extension, structural openings, kitchen-ready space | From £2,200 / m² |
| Full House Refurbishment | Rewiring, plumbing, plastering, joinery, and layout reconfigurations | From £1,500 / m² |
| Loft Conversion | Main rear dormer or hip-to-gable conversion with en-suite | From £45,000+ |
| Structural Knock-Through | Load-bearing wall removal, steel installation, basic finish | From £18,000+ |
What Drives Your Project Cost?
Renovation budgets vary based on key structural and architectural factors:
- Property Specification & Finishes: Standard vs. bespoke architectural glazing, custom joinery, and premium materials.
- Structural Complexity: Subterranean works, steel frame installation, and conservation area requirements.
- Planning & Building Regulations: Full planning permission vs. Permitted Development rights.
Contact Us
Telephone 020 8898 8299
Office address:
12 High Street, Hampton Wick, Kingston upon Thames, KT1 4DB
Street view
Interior view
City Lofts LondonWide Limited. Registered in England and Wales.
Company number 11454709. VAT number 299773521
Request Quotation
Request Your Free Architectural Consultation & Estimated Costing Complete this assessment to receive a tailored, itemised quote from our RIBA architectural team.
Request Quotation
Request Your Free Architectural Consultation & Estimated Costing Complete this assessment to receive a tailored, itemised quote from our RIBA architectural team.
Contact Us
Telephone 020 8898 8299
Office address:
12 High Street, Hampton Wick, Kingston upon Thames, KT1 4DB
Street view
Interior view
Company number 11454709. VAT number 299773521
See lots more testimonials that happy home owners have left on our Houzz profile, on our Which? Trusted page and on our Facebook page. We would be happy to get you in touch with any of our clients directly so you can ask them 121 about their loft conversion.
