Loft conversion cost
in Mayfair.
Mayfair — W1 — the Georgian and early Victorian district between Hyde Park and Regent Street. Most properties are commercial or converted to flats; remaining single-family homes are among the most valuable in London.
What makes loft work in Mayfair distinct.
Housing: Georgian and early Victorian terraces, plus mews properties; many Grade II or Grade II* listed.
Planning: Mayfair Conservation Area, with overlapping Hanover Square, Conduit Street and Berkeley Square conservation areas. A high listed-building density.
Applications go to City of Westminster. We submit on your behalf and handle conservation officer correspondence end-to-end.
The five loft types — W1 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Mayfair multiplier (1.30×) reflects local labour, scaffolding logistics, conservation requirements and finish expectations.
The 2026 London Loft Cost Guide.
Borough-by-borough pricing, a full cost breakdown, PD vs full planning explained, and the seven hidden costs to watch for in Mayfair and beyond.
Send me the guide.
What Mayfair homeowners ask us.
Do I need planning permission for a loft in Mayfair?
Mayfair Conservation Area, with overlapping Hanover Square, Conduit Street and Berkeley Square conservation areas. A high listed-building density. Outside conservation areas, most rear-dormer conversions in Mayfair qualify for permitted development (PD) within the 40m³ (terrace) or 50m³ (semi/detached) volume limits. Mansards always need full planning. We check your specific address before quoting and submit the application on your behalf.
What scale of loft project is typical in Mayfair?
Mansards on Georgian terraces are the norm, with budgets typically £250k–£500k all-in. Listed-building consent is required on most properties, and the design phase often runs 6–9 months. Mews properties are usually simpler — single-storey rear-roof additions with skylights.
How long does a Mayfair loft conversion take?
Typical timeline: 6–10 weeks for design and planning (longer in conservation areas like much of Mayfair), then 8–14 weeks on site for a standard dormer, 12–18 weeks for an L-shape or hip-to-gable, and 14–20 weeks for a mansard. City of Westminster processes PD-route Lawful Development Certificates in approximately 8 weeks.
What does a loft conversion add to Mayfair property values?
In W1, a well-executed loft conversion typically adds 15–25% to property value — often more in prime postcodes. The ROI is strongest when you add a double bedroom plus en-suite, which is the standard L-shape dormer configuration. Property uplift on a £59k–£286k build commonly exceeds the build cost by 30–60%.
Does 2VP work on Mayfair loft conversions?
Yes — Mayfair is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 5.5km from Mayfair. We've delivered loft conversions across the W1 postcode and our subcontractor network covers Westminster. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Pricing for Mayfair’s neighbours.
Twenty minutes on site in Mayfair.
On us.
Nick Elias RIBA and Vladimir will visit your Mayfair home, walk the loft, check head height, advise on PD vs planning, and give you a realistic budget and programme — even if a loft isn’t right for your house.
One number. Sixty seconds. No callback.
Price your Mayfair loft conversion using the same 2026 rate card we quote real clients with.
Price my Mayfair loft →