Every loft is different, so no two conversions run identically, but the order of the main stages is consistent. Knowing it helps you make decisions at the right time, such as choosing windows before the roof is formed. We do not give timings here, because they depend on the design and the house.
- Survey and design. The loft, roof structure and headroom are measured, and the type of conversion is chosen.
- Drawings and calculations. Architectural drawings, plus a structural engineer’s design for the new floor and any beams.
- Approvals. Planning permission or a lawful development certificate if relevant, Building Regulations approval, and party wall notices if a shared wall is affected.
- Preparation. Scaffolding goes up, the roof is protected, and the loft is cleared.
- Structure. The floor is strengthened, steel or timber beams are fitted, and the new roof shape is formed for a dormer, hip-to-gable or mansard conversion.
- Weathertight shell. Roof covering, windows and insulation make the new space watertight and thermally sound.
- Stairs and fire safety. The staircase, fire doors, smoke alarms and the protected escape route are installed.
- First fix. Electrics, plumbing and heating are routed before walls are closed.
- Boarding and finishing. Plastering, second fix, flooring, decoration and any bathroom fittings.
- Inspections and handover. Building control inspects at key stages and issues a completion certificate; you walk through the finished space with the builder.
For the choices behind stage one, see the guide to loft conversion types; for stage three, planning permission for a loft conversion and Building Regulations for a loft conversion; and for what drives the price, loft conversion cost in London.
This guide is general information for homes in England and is not legal or planning advice. Rules can change and differ between properties and local authorities, so always confirm the position with your council or a qualified professional.
Explore our loft conversion service or request a quote.