Every Type of
Loft Conversion
We Build

The right conversion type depends on your roof structure, property type, planning constraints, and budget. A rear dormer suits most terraced houses. L-shaped dormers suit Victorian terraces with outriggers. Hip-to-gable is designed for semi-detached and detached homes. Mansard conversions deliver maximum volume for period properties in conservation areas. Our surveyor assesses your specific property and recommends the best option at the free survey — no obligation.

Most loft conversions in London qualify under Permitted Development Rights and do not require a full planning application, so long as the extension does not exceed 40m³ (terraced) or 50m³ (detached/semi), does not project beyond the existing ridge, and the property is not in a conservation area or designated Article 4 area. Our planning team advises specifically at the free survey and manages any applications required as part of your fixed price.

Most loft conversions take 6–10 weeks on site. There is a preceding design and planning phase of approximately 6–10 weeks, depending on whether planning permission is required. You receive a full week-by-week construction programme from your project manager before work begins, and we commit to the completion date in your contract.

The Prime Loft fixed price is genuinely all-inclusive. It covers the free survey, architectural drawings, structural engineering calculations, all planning and Building Regulations applications, the complete build (including roofing, insulation, steelwork, carpentry, electrics, plumbing to the loft, plastering, first-fix joinery, staircase and loft hatch), and your 10-year structural warranty. There are no hidden management fees, no provisional sums, and no variation orders unless you request a change to the agreed scope.

A loft conversion typically adds 15–25% to a London property's value. On a £600,000 home that equates to £90,000–£150,000 in added value — significantly more than the cost of the conversion. The best returns come from adding a master bedroom with en-suite.

Yes. If you already have architectural drawings or planning permission, we provide competitive fixed-price quotations to build from your approved plans. We review the drawings, produce any required structural calculations, manage Building Regulations on your behalf, and deliver the project under our full fixed-price contract and warranty.