Loft Conversion Cost: Complete Breakdown 2026 in Christchurch
A loft conversion is one of the best-value home improvements — it adds a bedroom and bathroom without losing garden space. Costs range from £30,000 for a simple Velux conversion to £90,000 for a full mansard, depending on the type and specification. Here is what Christchurch homeowners should expect to pay.
Local cost range — Christchurch
£40,000–£72,000
What affects costs in Christchurch
Christchurch's mix of property types means loft conversion feasibility varies. Conservation area properties may need planning permission for any external roof changes.
Cost estimator
Rates for Christchurch
6m × 4m = 24m²
Estimated cost in Christchurch
Excl. VAT (£10925 – £15824)
Local insight: Christchurch's conservation areas can require upgraded materials (natural stone, matching brickwork) that increase costs by 10–15% compared to non-designated properties.
Cost breakdown
Cost by conversion type
Velux/rooflight: £30,000–£45,000 (simplest, no structural roof changes). Rear dormer: £40,000–£60,000 (most popular, adds headroom). L-shaped dormer: £50,000–£70,000 (two dormers meeting at a corner). Hip-to-gable + dormer: £55,000–£75,000 (maximises space on hipped roofs). Mansard: £65,000–£90,000 (most complex, most space).
What drives the cost
The main cost factors are: (1) type of conversion (dormer/mansard cost more than Velux); (2) size (one room or two); (3) en-suite bathroom (adds £5,000–£10,000); (4) staircase complexity (over the existing stair is cheapest); (5) access difficulty (scaffolding costs vary).
Professional fees for loft conversions
Design: £250 (PlanBuildCo). Structural calculations: £350 (always needed for floor joists and any roof steels). Planning application: £2,200 + £258 if required. Building Regulations: £399. Building control: £400–£800. Total professional fees: £1,500–£4,000.
| Type | Build Cost | Estimated Total |
|---|---|---|
| Velux/rooflight | £30,000–£45,000 | £35,000–£55,000 |
| Rear dormer | £40,000–£60,000 | £48,000–£72,000 |
| L-shaped dormer | £50,000–£70,000 | £58,000–£82,000 |
| Hip-to-gable + dormer | £55,000–£75,000 | £63,000–£88,000 |
| Mansard | £65,000–£90,000 | £75,000–£105,000 |
National guide figures. Local rates in Christchurch: £40,000–£72,000.
Frequently asked questions
National guide
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