Having the Beams team on hand to manage the project and provide extra reassurance on build decisions was incredibly helpful and made the whole experience stress free.
Kerry
London
They have been extremely efficient and reassuring. It was a complex project but they took it all in their stride. They recommended very good contractors who were all punctual, polite and capable.
Andrew
London
All about trust. I felt comfortable with my money, my project, and my home knowing that the outcome would be to my satisfaction or would be made good.
Chris
London
Walthamstow extension builders who design and build
Many Walthamstow terraces, especially around Walthamstow Village and the streets off Hoe Street, suit a side-return or rear extension that opens up the ground floor. Our in-house designers plan the extension around your property and how you actually use the space, then a vetted builder delivers it under one fixed-price contract.
Design and build under one roof means fewer handoffs between architect and builder, and one point of accountability if anything needs adjusting.
Types of house extension we build
Side-return, rear, wraparound and double-storey extensions, plus loft dormers combined with a ground floor extension for a full reconfiguration. We design around your property type and garden size, whatever the starting point.
What a house extension costs in Walthamstow
Based on Beams estimates for London house extension projects. Costs vary with size, structural complexity and finish.
Extension type | Typical cost range |
|---|---|
Side-return extension | £45,000 - £85,000 |
Rear extension | £50,000 - £95,000 |
Wraparound extension | £70,000 - £130,000 |
Double-storey extension | £90,000 - £170,000 |
Planning permission for extensions in Walthamstow
Many single-storey rear extensions fall under permitted development, but this depends on size, boundary distances and your specific property. Waltham Forest has several conservation areas covering parts of Walthamstow, including Walthamstow Village, Walthamstow St James and Lloyd Park, where permitted development rights can be more restricted and the council can also apply Article 4 directions removing specific rights entirely. If your home is in a conservation area or listed, check with Waltham Forest Council's planning team before finalising a design.
Our design and build process
1. Free estimate and design call — tell us about your property and what you want from the extra space.
2. Design and planning — drawings, structural input and any planning applications handled for you.
3. Build — a vetted builder delivers it under a fixed-price contract with milestone payments.
Why an extension is worth it
An extension gives you the space you need without the cost and disruption of moving, and a well-planned one can add usable living space that fits how your household actually lives, not just square footage on paper.
Extending a home in Walthamstow
Walthamstow's Victorian terraces, many around Walthamstow Village and Hoe Street, commonly have the side-return and garden layout that suits a rear or wraparound extension. The average property price across the borough of Waltham Forest was around £529,000 in the year to July 2026, according to provisional ONS and HM Land Registry figures, and adding well-designed space is one of the more reliable ways homeowners in the area use their budget to improve a period property rather than move.
Ready to extend your Walthamstow home?
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