Home Extensions

As a 2025 UK guide, a home extension typically costs between £20,000 and £70,000. The biggest factors are single vs double storey and floor area, foundations and structural work, and planning, glazing and finish quality. These are guide figures only — the best way to get an accurate price is two or three quotes, which our free matching service arranges for you.

Most home extension projects take around 3–6 months on site, plus design time and any approvals beforehand. Your matched specialist will give you a firm schedule once they've seen the project.

Many single-storey extensions fall under permitted development and don't need a full planning application, but limits apply to size, height and how close you build to boundaries — and the rules are tighter in conservation areas or for listed homes. Building regulations always apply, and a party wall agreement may be needed. Your matched builder or a planning expert will confirm exactly what's required.

A well-built extension typically adds both significant living space and long-term property value, though the uplift depends on your area and how well the extension suits the home. It's often the practical alternative to moving.

Allow roughly 3–6 months on site for most single or double-storey extensions, plus design, planning and building-regs time beforehand. Groundworks, weather and material lead times are the usual variables.

Yes — it's completely free for homeowners. Tell us about your project, and we match you with a vetted, insured local specialist suited to your job and budget, then introduce you personally. We're paid a small fee by the installer only once your project is confirmed, so we always work in your interest — no spam, no pressure.