House Extensions in Bromley

At Bigness Group, we design and build high-quality house extensions in Bromley, helping homeowners expand their space, enhance comfort, and increase property value.
From traditional homes in Chislehurst and Beckenham to modern houses in Orpington and Bromley South, our extensions are built to blend style with practicality — creating light-filled, functional spaces for modern living.

We take care of everything: design, planning applications, structural works, and construction — providing a smooth, start-to-finish experience tailored to your property and lifestyle.

Design and Build Services

Our Bromley design-and-build team manages your entire project under one roof for maximum efficiency and quality:

• Full measured survey, design, and 3D visualisations
• Planning permission and permitted development management
• Structural calculations and Building Control compliance
• Kitchen, dining, and interior space planning
• Dedicated project manager and progress updates

With one point of contact throughout, your extension is delivered on time, within budget, and to the highest professional standards.

Types of Extensions We Build

We construct every major form of home extension across Brent, including:

• Glass Box Extensions – Striking glass box extensions that redefine modern living.
• Modern House Extensions – Transform your home with a sleek, light-filled modern extension.
• Single-Storey Extensions – Ideal for kitchens, dining areas, or open-plan living.
• Double-Storey Extensions – Add space on both levels for bedrooms, offices, or bathrooms.
• Side-Return Extensions – Perfect for Victorian and Edwardian properties with narrow side gaps.
• Rear Extensions – Create bright and modern spaces opening onto your garden.
• Wrap-Around Extensions – Combine side and rear expansions for maximum space and light.
• Conservatories & Orangeries – Classic glazed additions for year-round use.
• Loft & Garage Conversions with Extensions – Integrated vertical or lateral expansions for full property transformation.

Construction Standards

Every Bigness project in Bromley follows a detailed, regulated build process:

1. Groundworks & Foundations – Engineered for Bromley’s varied terrain.
2. Structural Frame & Steel – Installed with precision for open-plan layouts.
3. Walls & Roofs – Brick match or render finishes with warm-roof insulation.
4. Glazing & Insulation – High-performance materials for comfort and efficiency.
5. Internal Finishes – Electrics, plumbing, flooring, and joinery completed to specification.
6. Final Inspection & Warranty – Building Control certification and guarantee included.

Local Knowledge

We’re experienced with Bromley Council’s planning regulations, including work within conservation areas such as Chislehurst, Bickley, and Bromley Common. Our familiarity with local design codes, materials, and heritage standards ensures your project is approved smoothly and complements its surroundings.

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.