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
Enfield extension builders who design and build
Getting an extension design that a builder can actually price, and a builder who can actually deliver that design, are usually two separate headaches. Beams handles both. Our in-house designers draw up your extension, and a vetted builder from our network prices and builds it, under one fixed-price contract agreed before work starts.
That matters in Enfield, where many streets sit inside a conservation area or carry an Article 4 direction, so getting the design and the planning approach right first time avoids costly delays.
Types of house extension we build
Side-return extensions: Reclaim the alley beside a terrace for a wider kitchen.
Rear extensions: Extend into the garden for a bigger kitchen-diner.
Wraparound extensions: Combine side and rear for maximum space.
Double-storey extensions: Add space upstairs and down in one build.
Garage conversions: Turn an unused garage into living space.
What a house extension costs in Enfield
Cost depends on the size and type of extension, foundations, roof design and finish. Enfield's average house price was around £471,000 in the year to July 2026 (ONS and HM Land Registry, provisional), one of the more affordable parts of outer London, and extension costs here tend to sit towards the lower-to-middle end of the London range. Rather than a headline figure, Beams gives you a free estimate range upfront, and your builder confirms a fixed price once the design is agreed.
Project size | Typical estimate |
|---|---|
Lower end | £45,000 |
Most projects | £75,000 |
Larger or higher spec | £120,000 |
Top 10% of projects | £220,000 |
Based on Beams estimates for London house extension projects, these figures are a general guide rather than a fixed quote. A single-storey side-return sits at the lower end, while a wraparound or double-storey extension pushes it higher.
Planning permission for extensions in Enfield
Many single-storey rear extensions fall under Permitted Development and do not need a full planning application, provided they stay within size limits. But Enfield has around 22 conservation areas, including Enfield Town, Forty Hill, Bush Hill Park, Southgate Green, Winchmore Hill, Clay Hill and Hadley Wood, and several of these carry Article 4 directions made in 2006 that remove permitted development rights for things like external alterations, roof changes and porches. In those areas, and for larger or two-storey extensions generally, you will usually need planning permission from Enfield Council. Our team checks your address against the council's conservation area and Article 4 maps before any design work starts.
Our design and build process
1. Get your free estimate: Tell us about your extension, space and budget.
2. Design and planning: Our designers draw up the extension and handle the planning route.
3. Build with confidence: A vetted builder delivers it under a fixed-price contract with milestone payments.
Why an extension is worth it
Moving involves stamp duty, agent fees and the upheaval of a sale. Extending gets you the space you need, in the home and the neighbourhood you already know, and a well-designed extension is generally one of the more reliable ways to add both floor area and value, alongside the day-to-day benefit of a bigger kitchen or living space.
Extending a home in Enfield
Enfield's housing stock runs from Victorian and Georgian terraces around Enfield Town to the inter-war semis and terraces that make up much of Southgate, Palmers Green, Winchmore Hill, Bush Hill Park and Gordon Hill. Side-return and rear extensions are common ways to open up the kitchen in a terrace, while semis often have more scope for a wraparound. With 22 conservation areas across the borough and Article 4 directions covering several of them, checking the planning position early matters more here than in many boroughs. Our vetted builders and in-house designers cover Enfield and nearby Barnet and Muswell Hill, and know Enfield Council's planning approach well.
The same design team, vetted builders and fixed-price process sit behind every project. See how our vetted builder network works, from the first design call to final sign-off.
Other services in Enfield
We also help Enfield homeowners with:
Bathroom renovation in Enfield
Basement conversion in Enfield
House extensions in nearby areas:
Ready to start your Enfield extension?
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