House Extension London | Rear & Side Extensions in North London

Looking for a professional house extension in London? Fixiz Ltd specialises in rear extensions, side extensions, and wraparound extensions throughout North London and the M25 area. Our expert team delivers high-quality house extensions that add valuable living space and increase your property value.

Why Choose Fixiz for Your House Extension London Project?

Modern single storey extension London - contemporary garage conversion with open plan design and large windows by Fixiz

 

Modern single storey extension in London – expert construction services creating bright, open-plan living spaces

With over 15 years of experience in residential construction, Fixiz Ltd has completed over 1,000 successful house extension projects across London. We handle every aspect of your extension from initial design through to final completion, including all planning permissions, building regulations, and structural calculations.

Our House Extension Services Include:

Rear Extensions – The most popular choice for London homeowners, rear extensions typically add 3-6 metres to your ground floor, creating space for larger kitchens, open-plan living areas, or garden rooms with bi-fold doors.

Side Return Extensions – Perfect for Victorian and Edwardian terraced houses, side return extensions utilise the narrow alleyway beside your property to create wider, brighter kitchens and dining spaces.

Wraparound Extensions – Combining rear and side extensions for maximum space, wraparound extensions can add 30-50 square metres of additional floor space to your home.

Double Storey Extensions – For families needing significant extra space, double storey extensions provide additional bedrooms and bathrooms above a ground floor extension.

House Extension Costs London 2025:

Single storey rear extension (3m): From £35,000
Single storey rear extension (6m): From £55,000
Side return extension: From £30,000
Wraparound extension: From £65,000
Double storey extension: From £85,000

All prices include foundations, structure, roofing, windows, doors, plastering, electrics, and plumbing. Final costs depend on specification and finishes chosen.

Our House Extension Process:

     

      1. Free Consultation – We visit your property to discuss your requirements and provide initial advice on what’s achievable

      1. Design & Planning – Our architects create detailed plans and handle planning permission applications where required

      1. Building Regulations – We submit all necessary applications and ensure full compliance

      1. Construction – Our skilled team completes your extension to the highest standards

      1. Final Inspection – Building control sign-off and handover of your new space

    Areas We Cover:

    We provide house extension services throughout North London including Barnet, Enfield, Haringey, Islington, Camden, and surrounding areas within the M25.

    Get Your Free House Extension Quote Today

    Contact Fixiz Ltd for a free, no-obligation quote for your house extension project. Call us on 020 7971 1318 or fill out our online enquiry form. We’ll arrange a convenient time to visit your property and discuss your extension plans.

     

    Explore our other property conversion services: loft conversion and garage conversion. We also offer comprehensive construction and renovation services across North London.