House Extensions in Haringey

At Bigness Group, we specialise in designing and building premium house extensions in Haringey, helping homeowners transform their living spaces with precision, functionality, and style.
From Victorian terraces in Crouch End to semi-detached homes in Muswell Hill and modern houses in Tottenham, our tailored extensions enhance comfort, space, and long-term value.

We manage the full process — design, planning, engineering, and construction — ensuring a stress-free experience and exceptional craftsmanship every step of the way.

Design and Build Services

Our Haringey design-and-build team provides a complete, end-to-end service under one roof:

• Full measured survey, design, and 3D architectural plans

• Planning and permitted development guidance for Haringey Council

• Structural engineering and Building Control compliance

• Kitchen, dining, and interior design coordination

• Dedicated project management from concept to completion

With Bigness, you get one expert team handling everything — designed for transparency, quality, and efficiency.

Types of Extensions We Build

We deliver all major types of house extensions in Haringey, including:

• Glass Box Extensions – Contemporary builds with minimalist architecture.
• Modern House Extensions – Contemporary designs with minimalist detailing.
• Single-Storey Extensions – Bright, open kitchen and dining spaces.
• Double-Storey Extensions – Add bedrooms, bathrooms, and upper-level living.
• Side-Return Extensions – Ideal for narrow Victorian and Edwardian homes in Crouch End or Hornsey.
• Rear Extensions – Create spacious, light-filled rooms facing your garden.
• Wrap-Around Extensions – Combine side and rear builds for full open-plan layouts.
• Conservatories & Orangeries – Elegant glazed additions for year-round comfort.
• Loft & Garage Conversions with Extensions – Maximise your property’s footprint vertically or laterally.

Construction Standards

Each Bigness project in Haringey follows a strict, high-quality construction process:

1. Groundworks & Foundations – Engineered for North London’s diverse soil types.
2. Structural Steelwork – RSJs and beams installed for open, modern layouts.
3. Walls & Roofs – Brick match, render, or zinc cladding with warm-roof insulation.
4. Windows & Glazing – Energy-efficient, Part L–compliant glazing systems.
5. Interiors & Finishes – Full electrical, plumbing, flooring, and joinery fit-outs.
6. Final Sign-Off – Building Control certification and workmanship warranty.

Local Knowledge

We have extensive experience working with Haringey Council’s planning and conservation guidelines, especially in areas like Crouch End, Muswell Hill, and Stroud Green.
Our local expertise ensures that every project aligns with borough standards, architectural heritage, and your personal design goals.

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.