Extension Cost Per Square Metre 2026: What to Expect in Ferndown
Cost per square metre is the standard way to compare extension quotes. But the figure varies dramatically depending on specification, region, complexity, and what is included. Here is what Ferndown homeowners should expect to pay.
Local cost range — Ferndown
£1,700–£2,400/m²
What affects costs in Ferndown
Ferndown offers some of the best value in Dorset — generous plots, good access, and competitive builder rates. Bungalow extensions are particularly cost-effective here.
Cost estimator
Rates for Ferndown
6m × 4m = 24m²
Estimated cost in Ferndown
Excl. VAT (£9821 – £14168)
Local insight: Ferndown's generous plot sizes and good access make it one of the most straightforward (and cost-effective) areas to extend in Dorset. Bungalow conversions are particularly popular here.
Cost breakdown
2026 rates by specification
Basic specification (standard bricks, flat roof, basic windows): £1,500–£2,000/m². Standard specification (quality bricks, bi-fold doors, underfloor heating): £2,000–£2,800/m². Premium specification (bespoke materials, structural glazing, high-end finishes): £2,800–£3,500/m². These are Dorset rates.
What affects the rate
Foundation depth (clay soil or trees nearby = deeper = more expensive), access difficulty (narrow lanes or terraced properties), specification level, bathroom inclusion (wet rooms cost more per m²), and the builder's current availability. A busy builder quotes higher.
| Region | Standard | High Spec |
|---|---|---|
| Dorset | £1,800–£2,200 | £2,500–£3,200 |
| London | £2,500–£3,500 | £3,500–£5,000 |
| South East | £2,000–£2,800 | £2,800–£3,800 |
| Midlands | £1,600–£2,200 | £2,200–£3,000 |
| North | £1,400–£2,000 | £2,000–£2,800 |
National guide figures. Local rates in Ferndown: £1,700–£2,400/m².
Frequently asked questions
National guide
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