Extension Builders in Alexandria
Find extension builders covering Alexandria, Dumbarton, Balloch, Helensburgh and surrounding areas. Local and Dumbarton-based extension builders who serve the G83 area for house extensions, conversions, structural alterations, and new builds.
Free directory of extension builders in Alexandria and Alexandria & Vale of Leven for house extensions, conversions, structural alterations, and new builds. No sign-up, no fees — contact Alexandria extension builders directly.
Extension Builders Listed in Alexandria
- Cunningham Builds — Cunningham Builds is a trusted local builder delivering high-quality house extensions, loft conversions, property refurbishments, and commercial fit-outs across Dumbarton. They specialize in working with historic properties and have completed major extensions in areas including Dalreoch, Silverton, Brucehill, and Castlehill. Their team includes time-served joiners, bricklayers, and fully insured tradespeople who manage projects from design through to final completion.[1] (Dumbarton)
- Bruach Architects — Bruach Architects is an RIAS Chartered Practice and RIBA Chartered Members firm with over 30 years of combined experience. They provide architectural design services for house extensions, including single and multi-storey extensions with internal alterations.[3] (Dumbarton)
- Helensburgh Building Services — Full-service building company offering house extensions, loft conversions, garage conversions, conservatories, and complete home renovations with skilled tradespeople including builders, joiners, and electricians. They work closely with clients to ensure projects are handled with attention to detail and within budget.[2] (Helensburgh)
- Brooks Tadlock Building & Joinery Limited — Multi-trade construction company covering building, joinery, and roofwork throughout West Scotland. Owner Brooks Tadlock has completed numerous projects including new builds, extensions, renovations, and over 50 kitchen and bathroom fit-outs since establishing the company in 2017.[6] (Helensburgh)
- A Mann Building Contractors — Residential house extension builders in Balloch7. (Balloch)
Areas Covered by Alexandria Extension Builders
- Alexandria — postcodes: G83
- Bonhill & Renton — postcodes: G83
- Jamestown & Balloch — postcodes: G83
Frequently Asked Questions — Extension Builders in Alexandria
Do I need a building warrant for an extension in Alexandria?
Yes — almost all extensions in Scotland require a building warrant from your local council. This is separate from planning permission. Your builder should handle the building warrant application, working with a structural engineer for drawings and calculations.
How much does a house extension cost in Alexandria?
A single-storey rear extension typically costs £1,200–£1,800 per square metre; two-storey £1,000–£1,500 per sqm. A typical 4m × 5m single-storey extension might cost £25,000–£45,000 all-in. Always get at least 3 detailed quotes.
Do extension builders from Dumbarton cover Alexandria?
Yes — Alexandria is close to Dumbarton and most Dumbarton-based extension builders cover Alexandria, Balloch, Helensburgh as standard.
What qualifications should an extension builder in Alexandria have?
Your builder should carry public liability insurance (at least £2 million), employer's liability if they have staff, and provide references. FMB or NHBC membership is a good sign. They should manage building warrants, structural engineers, and building control inspections.
How do I compare quotes from Alexandria extension builders?
Get at least 3 written quotes and compare: specification of foundations, blockwork, roof, windows, and finishes; building warrant inclusion; structural engineer's fees; payment schedule; timeline; and defects liability period.