Rear Extensions
That Transform Homes
Create the stunning open-plan kitchen-diner you've always wanted. Perfect for Victorian and Edwardian terraced homes.
Why a Rear Extension?
Most London terraced homes sacrifice kitchen space for more bedrooms. A rear extension reclaims your ground floor, creating the heart of your home—a bright, open space where family and friends naturally gather.
Whether it's a single-storey flat roof or a stunning pitched glass extension, we've completed 300+ rear extensions across London. From design to final handover, we handle everything: planning permissions, party wall agreements, structural calculations, and the build itself.
Types of Rear Extensions
Choose the style that best suits your home, budget, and aspirations.
Single-Storey Flat Roof
The most cost-effective option. Modern, minimalist design with skylights for natural light. Often permitted development.
Pitched Roof Extension
A traditional sloped roof that matches your existing home. Provides extra ceiling height and a classic aesthetic.
Full-Width Glass Extension
Floor-to-ceiling glazing with bi-fold doors. Maximum natural light and seamless indoor-outdoor living. The premium choice.
See the Transformation
Drag the slider to see how we transformed this Clapham Victorian terrace.
Before
After
Do You Need Planning Permission?
Most rear extensions qualify for Permitted Development—we handle all the complexities.
Permitted Development
Extensions up to 6m (3m for semi-detached) don't usually need planning permission. We handle the Lawful Development Certificate application.
Party Wall Agreements
Required when building on a boundary. We serve notice to your neighbours and manage the entire party wall process professionally.
Building Regulations
All extensions need Building Regs approval. Our in-house team prepares structural calculations and manages the inspection process.
From Consultation to Completion
We manage everything, so you don't have to.
Free Consultation
We visit your property, discuss your vision, measure up, and provide a ballpark cost. No pressure, just expert advice.
Design & Planning
Our architects create the drawings. We handle planning permissions, party walls, and building regulations for you.
The Build
12-16 weeks on average. Daily site management, weekly photo updates, and your project manager a phone call away.
Completion
Final inspection, snagging list, handover pack, and your 10-year warranty. You only pay the final amount when you're 100% happy.
Rear Extension Costs
We believe in upfront, honest pricing. Here's what you can expect—actual costs depend on size, finishes, and site conditions.
3m x 4m Extension (12sqm)
Basic flat roof, standard finishes
4m x 5m Extension (20sqm)
Pitched roof, mid-range finishes
Full-Width Glass Extension (25sqm+)
Bi-folds, premium finishes, underfloor heating
What's included: Design, planning, party walls, build, finishes, electrics, plumbing, glazing, heating, and our 10-year warranty.
Rear Extension FAQs
Most single-storey rear extensions take 12-16 weeks from breaking ground to completion. This includes 2-3 weeks for planning/approvals, 10-12 weeks building, and 1-2 weeks for final finishes and snagging.
85% of our rear extensions don't need full planning—they fall under Permitted Development. Detached homes can extend 4m, semi-detached 3m, and terraced 3m without planning. We always check your specific situation during the free consultation.
Yes, most clients stay at home. We create a temporary kitchen setup, seal off the work area with dust sheets, and clean the site daily. There will be 2-3 weeks of significant disruption when we knock through, but it's manageable.
In our experience across London, a well-designed rear extension adds £80-150k to your home's value, depending on location and finish quality. That's typically 150-200% return on investment, plus you get to enjoy the space.
Absolutely. Once we've finalized the design and you've approved the spec, the price is locked. No hidden costs. The only changes are if you request variations to the agreed plan.
Related Extension Services
Ready to Extend Your Home?
Get a precise, fixed-price quote for your rear extension within 48 hours of our free site visit.