House Extensions in Wandsworth

At Bigness Group, we design and build elegant, practical house extensions in Wandsworth, helping homeowners enhance space, functionality, and property value with precision and care.
From Victorian terraces in Battersea and Clapham Junction to period homes in Putney and Earlsfield, our bespoke extensions blend timeless design with modern comfort.

We manage the full process — from planning and design to construction and interiors — ensuring your extension is beautifully crafted, compliant, and built to last.

Design and Build Services

Our Wandsworth design-and-build team delivers a complete, end-to-end service:

• Measured survey and tailored architectural design

• Planning and permitted development advice for Wandsworth Council

• Structural engineering and Building Control coordination

• Kitchen, dining, and interior design for functional layouts

• Dedicated project management and milestone tracking

With Bigness Group, one trusted team oversees every stage — from first concept to handover — for a seamless, stress-free experience.

Types of Extensions We Build

We construct all major types of extensions across Wandsworth, including:

• Glass Box Extensions – Contemporary designs with clean lines and glass features.
• Modern House Extensions – Clean, minimalist structures with premium glazing.
• Single-Storey Extensions – Perfect for narrow Victorian or Edwardian homes in Battersea or Clapham.
• Double-Storey Extensions – Add bedrooms, bathrooms, or family rooms on both floors.
• Side-Return Extensions – Ideal for terraced homes in Bow, Stepney, and Limehouse.
• Rear Extensions – Create bright, open-plan spaces facing your garden.
• Wrap-Around Extensions – Combine side and rear extensions for maximum width.
• Conservatories & Orangeries – Stylish glazed designs for year-round comfort.
• Loft & Garage Conversions with Extensions – Turn unused spaces into practical, comfortable rooms.
• Basement Extensions – Create gyms, cinemas, or private lounges below ground.

Construction Standards

Every Bigness project in Wandsworth follows our rigorous six-step framework:

1. Groundworks & Foundations – Engineered for South West London’s soil conditions.

2. Structural Steelwork – RSJs and beams fitted for strong, open layouts.

3. Walls & Roofs – Brick match, render, or cladding with high-performance insulation.

4. Windows & Glazing – Energy-efficient materials meeting all UK standards.

5. Interior Finishes – Electrical, plumbing, flooring, and joinery delivered to specification.

6. Building Control & Warranty – Full compliance and long-term guarantee.

Local Knowledge

We have extensive experience with Wandsworth Council’s planning and conservation policies, including projects in Battersea, Wandsworth Town, and Putney.
Our understanding of heritage areas, building control, and modern design ensures your extension fits seamlessly within local architecture and passes approvals efficiently.

Costs and Financing

Every extension is unique, but here’s a general guide:

💡 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.