Extensions in South Wales
Fairway delivers full design-and-build house extensions across South Wales and the Bristol area. From compact single-storey rear builds to large wrap-around kitchen extensions and two-storey side builds, we handle everything in-house — architect drawings, structural engineer calcs, planning submissions, Building Control, the build itself and all the glazing. One team, one trusted point of contact, fixed written quotes.
Why choose Fairway for extensions
- Full Design-and-Build: Architect, structural engineer, Building Regs and the build — all under one roof.
- Premium Glazing Standard: Aluminium bifolds, sliding doors and roof lanterns built into every quote — never an upsell.
- Planning Handled: We prepare drawings, submit applications and manage conditions and Building Control.
- Fixed Written Quote: Itemised stage-payment pricing — no open-ended invoices at the end.
- Adds Major Property Value: Extensions consistently rank as the highest-ROI home improvement on the market.
- 10-Year Workmanship Guarantee: Backed by our long-standing local installer reputation.
Our extensions range
- Single-Storey Extensions: Rear, side or wrap-around — 15–35 m² of new ground-floor space.
- Double-Storey Extensions: Two floors of new space — extra bedroom + en-suite over bigger living room.
- Kitchen Extensions: Open-plan kitchen-diner extensions with bifolds and roof lanterns.
- Side & Side-Return Extensions: Fill in narrow side passages or driveways — particularly transformative on Victorian terraces.
- Rear Extensions: Extend straight out the back — the simplest planning route.
- Wrap-Around Extensions: L-shaped builds combining rear and side return — the gold-standard kitchen build.
Frequently Asked Questions
Do you handle the architect drawings and planning?
Yes — we provide a full design-and-build service including architect drawings, structural calcs, planning applications and Building Control sign-off.
How long does a home extension take to build?
Single-storey extensions typically complete in 8–14 weeks. Double-storey and wrap-arounds run 14–22 weeks. We provide a written programme with every quote.
How much does a home extension cost?
Single-storey runs £1,800–£2,800 per m². Double-storey runs £2,200–£3,200 per m² of new floor area. Wrap-arounds typically £75,000–£140,000. Fixed quotes provided after survey.
Do I need planning permission for an extension?
Many single-storey rear extensions are permitted development. Double-storey, large side and wrap-around extensions usually need full planning. We confirm before quoting and handle any applications.
Free Quote in 24 Hours — We Beat Any Like-for-Like Quote
Get a fixed-price quote within 24 hours. Free home survey. 10-year guarantee. Call 02920 860894 or request a callback.