House Extensions in Greenwich

At Bigness Group, we design and build bespoke house extensions in Greenwich, combining precision engineering with contemporary design to create bright, functional spaces that enhance every home.
From heritage townhouses in Greenwich and Blackheath to modern family homes in Eltham and Charlton, we deliver tailored extensions that balance style, practicality, and long-term value.

Our team manages everything — planning, design, structural engineering, and construction — to ensure a seamless process and a flawless finish.

Design and Build Services

Our Greenwich design-and-build team delivers complete project management under one contract:

• Full measured survey and architectural design
• Planning applications and permitted development guidance through Greenwich Council
• Structural engineering and Building Control coordination
• Kitchen, dining, and interior layout optimisation
• Transparent scheduling and dedicated project management

From first sketch to completion, we ensure precision, accountability, and quality at every stage.

Types of Extensions We Build

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

• Glass Box Extensions – Contemporary builds with minimalist architecture.
• Modern House Extensions – Minimalist, light-filled architectural statements.
• Single-Storey Extensions – Bright, open spaces ideal for kitchens and dining.
• Double-Storey Extensions – Add new bedrooms or offices with a connected layout.
• Side-Return Extensions – Perfect for Victorian and Edwardian terraces in Blackheath.
• Rear Extensions – Create seamless links between home and garden.
• Wrap-Around Extensions – Combine rear and side infill for maximum living space.
• Conservatories & Orangeries – Elegant glazed spaces for year-round comfort.
• Loft & Garage Conversions with Extensions – Add vertical or lateral space for family growth.

Construction Standards

Every Greenwich project follows our proven high-quality build process:

1. Groundworks & Foundations – Engineered for the borough’s varied terrain and sub-soils.
2. Structural Framework – RSJs and steelwork for open-plan strength.
3. Walls & Roofs – Matching brickwork or render with warm-roof insulation.
4. Windows & Glazing – Energy-efficient materials compliant with current Part L standards.
5. Interiors – Electrical, plumbing, flooring, and bespoke joinery to your specification.
6. Sign-Off & Warranty – Building Control certification and workmanship guarantee.

Local Knowledge

We’re fully familiar with Greenwich Council’s planning and conservation regulations, covering protected zones like Greenwich Park, Blackheath, and Charlton Village.
Our experience navigating these local frameworks ensures smooth approvals and designs that respect the area’s architectural heritage.

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.