House Extensions in Waltham Forest
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At Bigness Group, we design and build high-quality house extensions in Waltham Forest, creating light-filled, functional, and beautifully finished homes across North East London.
From Edwardian terraces in Walthamstow to detached homes in Chingford and Leytonstone, our bespoke extensions enhance your property’s comfort, efficiency, and long-term value.
We handle everything — design, planning, structural engineering, and build — ensuring a seamless process from first sketch to final sign-off.
Design and Build Services
Our Waltham Forest design-and-build team offers a full, end-to-end service:
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Measured survey and bespoke architectural design
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Planning applications and permitted development support for Waltham Forest Council
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Structural calculations and Building Control compliance
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Kitchen, dining, and layout planning for modern living
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Dedicated project management with progress updates and clear communication
With Bigness Group, one expert team manages the entire project — providing accountability, precision, and peace of mind.
Types of Extensions We Build
We construct all major types of home extensions across Waltham Forest, including:
• Glass Box Extensions – Contemporary designs with clean lines and glass features.
• Modern House Extensions – Minimalist designs with sleek materials and glazing.
• Single-Storey Extensions – Open-plan living and kitchen spaces.
• Double-Storey Extensions – Perfect for narrow terraces in Walthamstow or Leyton.
• Side-Return Extensions – Ideal for terraced homes in Bow, Stepney, and Limehouse.
• Rear Extensions – Garden-facing layouts with natural light and sliding doors.
• Wrap-Around Extensions – Combine side and rear designs for full-width living.
• Conservatories & Orangeries – Glazed, year-round extensions for dining or relaxation.
• Loft & Garage Conversions with Extensions – Create additional floors or repurpose underused space.
• Basement Extensions – Create gyms, cinemas, or private lounges below ground.
Construction Standards
Every Bigness project in Waltham Forest follows our strict six-phase build process:
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Groundworks & Foundations – Engineered for local ground conditions and property type.
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Structural Framework – RSJs and beams installed for open, stable layouts.
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Walls & Roofs – Brick match, render, or cladding with full insulation.
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Windows & Glazing – High-performance systems meeting all energy standards.
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Interior Fit-Out – Electricals, plumbing, plastering, flooring, and joinery to spec.
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Final Inspection & Warranty – Building Control approval and workmanship guarantee.
Local Knowledge
We’re familiar with Waltham Forest Council’s planning and conservation guidelines, including works near Lloyd Park, Forest Road, and the Walthamstow Village Conservation Area.
Our local expertise ensures your extension gains approval smoothly and complements the character of your property and neighbourhood.
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 Waltham Forest’s housing stock and planning system.
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Full-service delivery: design, permissions, build, and interiors handled in-house.
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Accredited professionals: compliant with UK Building Regulations and safety standards.
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Transparent pricing: clear, fixed quotations and milestone payments.
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Proven results: trusted by homeowners across North East London.
With Bigness Group, your extension is built with precision, purpose, and pride.
FAQ
Do I need planning permission for an extension in Waltham Forest?
Some extensions are covered under permitted development, but larger or multi-storey builds require full planning. We manage all submissions and approvals.
How long does construction take?
Typically 8–14 weeks for single-storey and 12–20 weeks for double-storey or complex extensions.
Do you handle listed or conservation properties?
Yes — we specialise in heritage-sensitive extensions that meet conservation standards.
Can you include kitchen and interior fit-outs?
Absolutely. We offer integrated interior, kitchen, and lighting solutions as part of the project.
Our Recent Projects in Waltham Forest
Recent Bigness projects include a wrap-around kitchen extension in Walthamstow, a glass-roof rear addition in Chingford, and a double-storey family build in Leyton.
Each demonstrates our signature craftsmanship, attention to detail, and commitment to creating modern living spaces that enhance everyday life.
House Extensions in London by Borough
Bigness Group designs and builds bespoke house extensions across all London boroughs, including Tower Hamlets and the wider East London area. Our planning expertise, architectural skill, and construction quality ensure every project enhances both property value and lifestyle.
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
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