House Extensions in Richmond upon Thames
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At Bigness Group, we design and build bespoke house extensions in Richmond upon Thames, helping homeowners create elegant, light-filled spaces that blend modern comfort with classic design.
From period homes in Kew and Barnes to detached properties in Twickenham and Teddington, we deliver extensions that enhance space, functionality, and long-term value.
Our end-to-end approach covers everything — from planning and design to construction and interior finishes — ensuring a seamless process and a stunning result every time.
Design and Build Services
Our Richmond design-and-build team provides a complete, professional service:
- Detailed survey and bespoke architectural design
- Planning and permitted development management for Richmond Council
- Structural calculations and Building Control compliance
- Interior planning, kitchen, and lighting integration
- Dedicated project management and milestone reporting
With one expert team managing every detail, Bigness Group ensures precision, accountability, and exceptional craftsmanship from start to finish.
Types of Extensions We Build
We construct all major types of residential extensions across Redbridge, including:
• Glass Box Extensions – Clean, contemporary architecture for modern homes.
• Modern House Extensions – Contemporary builds for minimalist homes.
• Single-Storey Extensions – Create spacious kitchen or dining areas filled with light.
• Double-Storey Extensions – Add bedrooms or bathrooms while expanding downstairs living.
• Side-Return Extensions – Ideal for terraced homes in Ilford and Wanstead.
• Rear Extensions – Extend towards the garden for open-plan living.
• Wrap-Around Extensions – Combine side and rear layouts for maximum space.
• Conservatories & Orangeries – Elegant glazed spaces for all seasons.
• Loft & Garage Conversions with Extensions – Optimise unused areas for extra rooms or offices.
• Basement Extensions – Create gyms, cinemas, or private lounges below ground.
Construction Standards
Every Bigness project in Richmond follows our trusted six-step process:
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Groundworks & Foundations – Engineered for the borough’s varied soil and floodplain conditions.
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Structural Framework – RSJs and beams installed for stability and open layouts.
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Walls & Roofing – Matching brickwork or render with premium insulation systems.
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Windows & Glazing – Energy-efficient, Part L–compliant materials.
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Interior Fit-Out – Plumbing, electrical, plastering, flooring, and joinery to spec.
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Final Certification – Building Control sign-off and workmanship warranty included.
Local Knowledge
We have extensive experience working with Richmond Council’s planning and conservation guidelines, including sensitive riverside zones and heritage areas in Barnes, Kew, and Richmond Hill.
Our expertise ensures your extension blends seamlessly with local architecture and complies fully with all borough standards.
Costs and Financing
Every extension is unique, but here’s a general guide:
| Type | Typical Cost Range (2025) |
|---|---|
| Single-Storey Extension | £45,000 – £85,000 |
| Double-Storey Extension | £75,000 – £130,000 |
| Wrap-Around Extension | £90,000 – £160,000 |
| Side-Return Extension | £40,000 – £75,000 |
💡 Factors include size, materials, access, and specification level.
We provide transparent quotes with detailed breakdowns and stage payments.
Financing options may be available through our partner lenders for eligible clients — ask our team for guidance on home improvement financing.
The Process
1. Consultation & Site Visit – We meet you on-site to discuss ideas, goals, and feasibility.
2. Design & Planning – We prepare drawings, handle permissions, and finalise the budget.
3. Construction Phase – Our project manager oversees all work, ensuring safety and communication at every step.
4. Completion & Aftercare – Once finished, we conduct final inspections and provide warranty documentation.
We also offer optional maintenance plans to keep your new space performing at its best.
Why Choose Bigness Group
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Local expertise: deep understanding of Richmond’s planning and architectural heritage.
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Full-service approach: one team managing design, planning, and build.
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Accredited professionals: fully compliant with UK Building Regulations.
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Transparent pricing: itemised quotes with clear milestones.
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Proven reliability: trusted by homeowners across South West London.
With Bigness Group, your house extension combines modern comfort, traditional craftsmanship, and absolute attention to detail.
FAQ
Do I need planning permission for an extension in Richmond?
Many homes in conservation areas require approval. We manage all planning applications and liaise directly with Richmond Council on your behalf.
How long does construction take?
Typically 8–14 weeks for single-storey extensions and 12–20 weeks for larger or multi-level projects.
Can you work on heritage or listed buildings?
Yes — we specialise in heritage-sensitive builds that comply with all local and national guidelines.
Do you handle interior design and kitchen installation?
Absolutely. We deliver a complete interior service, including bespoke joinery, flooring, and lighting.
Our Recent Projects in Richmond upon Thames
Recent Bigness projects include a wrap-around kitchen extension in Twickenham, a modern glass rear addition in Kew, and a double-storey family build in Teddington.
Each reflects our dedication to precision, detail, and craftsmanship — hallmarks of the Bigness Group approach.
House Extensions in London by Borough
Bigness Group designs and builds high-end house extensions across all London boroughs, including Richmond upon Thames. Our planning expertise, craftsmanship, and attention to architectural harmony make us the trusted choice for discerning homeowners across South West London.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster
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