Extension building costs in Brentwood vary significantly based on project scope, materials, ground conditions, and whether planning permission is required. The South East region typically commands premium rates compared to the national average, reflecting higher labour costs and material expenses. BizHub365 connects Brentwood homeowners with experienced local extension builders, helping you compare quotes and find the right professional for your project at a transparent price.
Extension Builder Prices in Brentwood
| Service | Typical Cost | Unit |
|---|---|---|
| Single-storey rear extension (basic build, per sq m) | £1400 – £2200 | per m² |
| Double-storey extension (per sq m) | £1800 – £2800 | per m² |
| Extension builder labour (qualified tradesman) | £50 – £90 | per hour |
| Foundation and groundwork (single-storey extension) | £2500 – £5000 | per job |
| Roof installation (single-storey extension) | £3500 – £6500 | per job |
| Building Regulations inspection and certification | £400 – £800 | per project |
| Full project management and supervision (daily rate) | £150 – £250 | per day |
Prices are indicative averages for Brentwood. Actual quotes will vary based on job specifics.
What Affects the Cost?
Extension costs in Brentwood are shaped by several key factors: project complexity (single versus double-storey), floor area and design specifications, ground conditions and excavation requirements, material choices (brick, render, glazing quality), local planning and Building Regulations approval, existing property condition, and labour availability. Proximity to London and Essex's high labour costs means Brentwood rates sit 20–30% above national averages. Weather delays and site access constraints can also impact timelines and costs.
Money-Saving Tips
Book your extension during winter (October–February) when builders have more availability and may offer discounted rates. Obtain multiple competitive quotes from BizHub365-registered builders. Consider phasing the project or simplifying the design to reduce material and labour costs without compromising quality.
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