House Extensions in Hammersmith and Fulham

At Bigness Group, we design and build exceptional house extensions in Hammersmith and Fulham, combining timeless London architecture with modern functionality.
From Victorian terraces in Brook Green to elegant townhouses in Parsons Green and Fulham Broadway, our bespoke extensions bring more light, space, and value to every property.

We handle the entire process — from architectural design and planning permission to construction and finishing — ensuring a smooth, stress-free experience from concept to completion.

Design and Build Services

Our Hammersmith and Fulham design-and-build team provides a complete turnkey solution:

• Full measured survey and bespoke architectural design

• Planning applications and permitted development advice through the borough council

• Structural calculations and Building Control compliance

• Kitchen, dining, and interior design integration

• Dedicated project management with clear communication and scheduling

With Bigness, you get one accountable team managing every detail — on time and within budget.

Types of Extensions We Build

We construct every major form of home extension across Hammersmith and Fulham, including:

• Glass Box Extensions – Contemporary builds with minimalist architecture.
• Modern House Extensions – Sleek architectural statements for contemporary homes.
• Single-Storey Extensions – Ideal for expanding kitchens and dining spaces.
• Double-Storey Extensions – Add bedrooms or bathrooms above ground level.
• Side-Return Extensions – Perfect for Victorian and Edwardian terraces in Blackheath.
• Rear Extensions – Extend toward the garden with full-width glazing and rooflights.
• Wrap-Around Extensions – Combine side and rear layouts for seamless flow.
• Conservatories & Orangeries – Classic glazed additions for all seasons.
• Loft & Garage Conversions with Extensions – Transform underused space into stylish living areas.

Construction Standards

Every Bigness project in Hammersmith and Fulham follows a rigorous build process:

1. Groundworks & Foundations – Designed for tight urban plots and neighbouring structures.

2. Structural Steelwork – RSJs and beams installed for safe, open layouts.

3. Walls & Roofing – Brick match or render finishes with warm-roof insulation.

4. Glazing & Energy Systems – High-performance materials meeting current standards.

5. Interior Fit-Out – Plumbing, electrics, flooring, and bespoke carpentry.

6. Final Sign-Off – Building Control certification and structural warranty.

Local Knowledge

We are experts in navigating Hammersmith and Fulham Council’s planning policies, including conservation areas in Fulham Palace Road, Parsons Green, and Brook Green. Our designs respect local heritage while integrating modern technologies for comfort and efficiency.

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.