Thinking about extending rather than moving? You’re not alone. With stamp duty and moving costs climbing, more Croydon homeowners are choosing to build out instead of up sticks.
But before you fall in love with an open-plan kitchen extension, you need real numbers. Here’s what extending a house actually costs in 2026, and what shapes the final bill.
Why So Many Homeowners Are Choosing to Extend
Moving house isn’t cheap. Between estate agent fees, stamp duty, and the stress of a chain, staying put and building out often works out better value.
If you’re considering home renovations in Croydon, extending your property can be a practical and cost-effective alternative. An extension also lets you design the space around how you actually live, rather than settling for whatever’s already there.
How Much Does It Cost to Extend a House UK-Wide in 2026?
There’s no single answer, and anyone who gives you one figure without asking about your project is guessing. That said, national averages give you a solid starting point.
Most single-storey extensions cost somewhere between £1,800 and £3,000 per square metre, depending on specification and finish. A typical 20m² rear extension, built to a decent mid-range spec, usually lands between £35,000 and £60,000.
Here’s a rough breakdown by size:
- Small extension (10-15m²): £20,000 – £40,000
- Medium extension (20-25m²): £40,000 – £65,000
- Large extension (30m²+): £65,000 – £100,000+
- Double-storey extension: often 10-15% cheaper per m² than single storey, since foundations and roofing costs are shared
Labour typically makes up around 40-45% of your total budget, with materials, professional fees, and VAT covering the rest.
What Actually Drives the Price Up
Size and Layout
Bigger obviously costs more, but layout complexity matters just as much. A simple rectangular extension is cheaper to build than one with awkward angles or a wraparound design.
Location Within London
Croydon and the wider South East typically run 20-30% above the national average, mostly down to higher labour rates and site access costs.
Roof Type and Glazing
A flat roof is the budget option. Pitched roofs, roof lanterns, and bifold doors all add cost, but they also add light and kerb appeal.
Site Access
No side access to your garden? Materials may need to come through the house, which slows everything down and pushes labour costs up.
Home Renovations Croydon Homeowners Are Investing In
Extensions are just one part of the picture. Loft conversions, kitchen remodels, and full house renovations are all popular ways Croydon homeowners are adding space and value without moving.
Truestone Construction Ltd. works across all of these project types, so whatever you’re planning, there’s usually more than one route to get there.
House Extensions Croydon Homeowners Can Rely On
Truestone Construction Ltd. has delivered house extensions across Croydon for years, from compact rear extensions to full double-storey builds.
Every project starts with an honest conversation about budget, before a single brick gets ordered. That means fewer surprises and a final bill that matches what you were quoted.
Get a Free Quote From Truestone Construction Ltd.
An extension is a big decision, and working out how much does it cost to extend a house UK-wide can feel daunting without proper figures behind it.
Truestone Construction Ltd. offers free, no-obligation quotes for homeowners across Croydon. Visit truestoneconstruction.co.uk to start planning your project today.
