House Extensions in Havering
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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:
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Measured survey, design concepts, and 3D visuals
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Planning applications and permitted development advice for Havering Council
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Structural calculations and Building Control coordination
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Kitchen, living, and loft integration
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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:
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Groundworks & Foundations – Tailored to local soil and drainage conditions.
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Structural Framework – RSJs and beams installed for strength and open layouts.
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Walls & Roofing – Brick match, render, or cladding with high-grade insulation.
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Windows & Glazing – Energy-efficient systems meeting Part L regulations.
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Interiors & Finishes – Plumbing, electrics, plastering, flooring, and joinery.
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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:
| Type | Typical Cost Range (2025) |
|---|---|
| Single-Storey Extension | £45,000 – £85,000 |
| Double-Storey Extension | £75,000 – £130,000 |
| Wrap-Around Extension | £90,000 – £160,000 |
| Side-Return Extension | £40,000 – £75,000 |
💡 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.
The Process
1. Consultation & Site Visit – We meet you on-site to discuss ideas, goals, and feasibility.
2. Design & Planning – We prepare drawings, handle permissions, and finalise the budget.
3. Construction Phase – Our project manager oversees all work, ensuring safety and communication at every step.
4. Completion & Aftercare – Once finished, we conduct final inspections and provide warranty documentation.
We also offer optional maintenance plans to keep your new space performing at its best.
Why Choose Bigness Group
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Local expertise: deep knowledge of Havering’s planning processes and property styles.
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All-in-one service: design, planning, engineering, and build under one roof.
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Certified quality: fully compliant with UK Building Regulations.
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Transparent pricing: clear scopes and milestone payments.
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Proven reliability: trusted by homeowners across East London.
Bigness Group combines innovation and craftsmanship to create extensions that improve how you live — beautifully and practically.
FAQ
Do I need planning permission for an extension in Havering?
Many smaller extensions fall under permitted development, but larger or multi-level projects typically need full planning. We handle all applications and drawings.
How long does construction take?
Most single-storey extensions take 8–14 weeks, while double-storey or wrap-around builds take 12–20 weeks, depending on complexity.
Can you match materials with my existing house?
Yes — we source matching bricks, tiles, and render for a seamless appearance.
Do you provide full interior services?
Absolutely. We offer kitchen, flooring, and lighting fit-outs as part of your build.
Our Recent Projects in Havering
Recent Havering builds include a wrap-around family extension in Romford, a rear kitchen addition in Hornchurch, and a double-storey build in Upminster.
Each project demonstrates our hallmark craftsmanship, efficiency, and precision — turning great design into lasting value.
House Extensions in London by Borough
Bigness Group designs and builds bespoke house extensions across all London boroughs, including Havering and the wider East London area. Our expertise ensures smooth planning, precise execution, and a finish that blends perfectly with your home and neighbourhood.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster
Practical thinking for better-managed buildings.
Guidance, technical insight and practical perspectives on compliance, maintenance, building performance and long-term improvement.
