One price. Everything included.

Mayfair Studio charges one fixed price of £1,880 for a loft conversion or extension. That covers everything: measured survey, design drawings, the planning application, building regulations drawings and structural calculations. Traditional architects typically charge £3,000–£8,000 for the same scope, with structural calculations billed separately on top.

The survey, architectural design drawings, your planning or permitted development application prepared and submitted, building regulations drawings, structural engineer calculations, party wall notices where needed, unlimited design revisions, free amendments if the council asks for changes, and free resubmission if refused. The only things not included are fees paid direct to the council, building control inspection fees, and a party wall surveyor in the rare case a neighbour formally dissents.

Yes. Stage 1 is £995 and takes you from first drawings through design to planning submission. Stage 2 is £885 for the measured survey, building regulations drawings and structural calculations once your approval is in. The total is always £1,880 - no extras between stages.

Stop after Stage 1. You pay £995 total for the design drawings and submitted planning application, and nothing more. You can come back for the survey and building regs package whenever you are ready to build.

Usually not. We prepare planning drawings from planning records, EPC and property data, Ordnance Survey mapping and your photos - which is why first drawings arrive within 2 weeks of instruction rather than after a survey appointment. The full measured survey happens at the building regs stage, where millimetre precision matters. If your property is unusual we will tell you up front and survey earlier.

If you have a genuine written quote from another UK practice for the same all-in scope - survey, planning drawings and application, building regulations drawings and structural calculations - on a standard residential project, we will match it. Like-for-like scope only, standard projects only, at our discretion.

It depends on your property's specific constraints. Use Mayfair Studio's free planning permission check at mayfairstudio.co.uk/planning-permission-check for an instant answer before you spend anything. Buying a property or plot first? The £395 Site Planning Report at mayfairstudio.co.uk/site-planning-report is a pre-purchase planning appraisal delivered in 24 hours.

First drawings within 2 weeks of instruction - no survey appointment to wait for - and your application submitted within about 3 weeks. The council then typically takes 8 weeks to decide. The measured survey and building regs package follow approval.

The £1,880 package covers standard lofts and extensions. Basements, new builds, listed buildings, change of use and multi-project renovations are quoted individually, typically from £2,495. Start with the free planning check and we will confirm which route your project falls under.

Mayfair Studio analyses 2,589,298 planning decisions across 180 councils to assess your chances before submitting. If your application is refused, we resubmit for free.

Based on Mayfair Studio's analysis of 2,589,298 planning decisions across 180 councils and construction cost data, a single-storey rear extension in London costs £60,000–£135,000 to build, depending on size and specification. Design and planning with Mayfair Studio is £1,880 all-in.