House Extensions in Havering

At Bigness Group, we design and build exceptional house extensions in Havering, creating more space, light, and comfort for homeowners across East London.
From period homes in Romford and Upminster to modern family houses in Hornchurch and Rainham, we deliver bespoke extensions tailored to each property’s style and your family’s lifestyle.

We manage the full journey — planning, design, engineering, and construction — ensuring a smooth, transparent process and impeccable results every time.

Design and Build Services

Our Havering design-and-build team provides a full end-to-end service:

• Measured survey, design concepts, and 3D visuals

• Planning applications and permitted development advice for Havering Council

• Structural calculations and Building Control coordination

• Kitchen, living, and loft integration

• Project management with progress tracking and clear communication

With Bigness, your entire project is handled by one team — from first concept to final completion.

Types of Extensions We Build

We construct all major types of home extensions across Harrow, including:

• Glass Box Extensions – Contemporary builds with minimalist architecture.
• Modern House Extensions – Sleek designs that fuse architecture and innovation.
• Single-Storey Extensions – Expand your kitchen, dining, or family area with natural light.
• Double-Storey Extensions – Add bedrooms or offices above while extending living space below.
• Side-Return Extensions – Perfect for semi-detached and terraced homes.
• Rear Extensions – Create spacious, modern garden-facing living areas.
• Wrap-Around Extensions – Combine side and rear builds for full open-plan layouts.
• Conservatories & Orangeries – Glazed extensions for all-season comfort.
• Loft & Garage Conversions with Extensions – Add new rooms vertically or repurpose existing structures.

Construction Standards

Every Bigness project in Havering follows our rigorous, safety-first construction process:

1. Groundworks & Foundations – Tailored to local soil and drainage conditions.

2. Structural Framework – RSJs and beams installed for strength and open layouts.

3. Walls & Roofing – Brick match, render, or cladding with high-grade insulation.

4. Windows & Glazing – Energy-efficient systems meeting Part L regulations.

5. Interiors & Finishes – Plumbing, electrics, plastering, flooring, and joinery.

6. Building Control & Warranty – Final certification and workmanship guarantee.

Local Knowledge

We’re familiar with Havering Council’s planning and building control requirements, ensuring your extension gains approval quickly and meets all local standards.
From Romford’s suburban developments to Upminster’s detached homes, our local experience ensures every project fits seamlessly within the borough’s architectural landscape.

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.