Double-Storey Extensions in Caerphilly
Caerphilly (CF83) · Caerphilly County Borough · Free written quote · 10-year guarantee · We beat any like-for-like quote
From the established streets of Caerphilly out to the surrounding CF83 villages, two-storey side and rear extensions are a weekly job for our installation teams. Caerphilly itself has a distinct character. Caerphilly is one of the largest towns in the county borough, known for its iconic medieval castle and bustling town centre. Many properties here are a mix of Victorian terraces, 1970s estates and modern developments, all benefiting from modern window and door upgrades. On a double-storey build here we typically specify full design-and-build with planning, structural engineer, Building Control and aluminium glazing, which double the square footage for only modestly higher build cost — easily the best £/m² ratio on the market. Matched brickwork, roofline and window style so the extension looks original to the property. Lead times into nearby Bedwas and Trethomas stay short because our vans are based just down the road in Bedwas. We're a family-run installer — Fairway Window Systems Ltd, based in Bedwas — and every job is signed off by a director. Fixed itemised stage payments, 10-year workmanship guarantee.
A double-storey extension delivers far more value per pound than a single-storey because you get two floors of new space for only marginally more groundwork and roofing. Typically that means a bigger kitchen or lounge downstairs and an extra bedroom (often with en-suite) upstairs. We handle full design-and-build including planning applications where required. Most two-storey extensions complete in 14–22 weeks.
Why Caerphilly homeowners choose Fairway
- Local installation team covering Caerphilly County Borough and CF83.
- Free no-obligation survey at your Caerphilly property.
- Written quote — we beat any like-for-like quote.
- 10-year guarantee on every double-storey extensions installation.
Double-Storey Extensions benefits
- Two Floors of New Space: Roughly double the m² for only 30–40% more cost than a single-storey of the same footprint.
- Adds a Bedroom & Bathroom: Most clients add a master bedroom with en-suite upstairs and bigger living space downstairs.
- Highest ROI: Two-storey extensions consistently deliver the best resale return of any home improvement.
- Design-and-Build Service: Architect, structural engineer, Building Regs and the build — all under one roof.
- Fixed Written Quote: Detailed itemised pricing with stage payments — no surprise costs.
- Matched to Existing House: Brickwork, roofline and window style carefully matched so the extension looks original.
Frequently Asked Questions
Do I need planning permission for a double-storey extension?
Yes — two-storey extensions almost always require a full planning application. We handle the entire process, from drawings to submission and conditions discharge.
How long does a double-storey extension take?
Most two-storey extensions are completed in 14–22 weeks from groundworks to handover, depending on size and complexity.
How much does a double-storey extension cost?
Typically £2,200–£3,200 per m² of new floor area — a 40 m² (20 m² over two floors) extension is usually £85,000–£130,000. Fixed quotes after survey.
Get a Free Quote — We Beat Any Like-for-Like Quote
Get a free written quote. Free home survey. 10-year guarantee. Call 02920 860894 or request a callback.