Instant Estimate
Extension & Loft Planner
Configure your ideal build type, floor area, and finish standard to get an instant cost bracket.
1. Build Category:
Select project type
Single-Storey Rear Extension
Two-Storey Extension
Velux Loft Conversion
Dormer Loft Conversion
Mansard Loft Conversion
Garage Conversion
2. Internal Floor Area (sqm):
3. Specification Finish Level:
Standard - Radiators, basic electrics & standard plaster finish
Premium - Underfloor heating & architectural glazing finish (+25%)
Luxury - Bespoke joinery, high-end fixtures & smart automation (+55%)
Calculate Estimated Build Cost
Your Construction Estimate