From the team behind Hampstead Renovations · Est. 2009 · Learn more
🧱

Rear Extension in Mayfair

Single and double-storey rear extensions to add living space. Includes groundworks, structural steelwork, roofing, and weathertight shell or full fit-out.

£40,000–£100,00010–16 weeksW1

What does rear extension involve?

Single and double-storey rear extensions to add living space. Includes groundworks, structural steelwork, roofing, and weathertight shell or full fit-out.

In Mayfair W1, properties are predominantly georgian townhouses & luxury flats, which can present specific considerations for this type of work. Mayfair falls within a conservation area managed by Westminster Council, which may require additional consents for external works. The Grosvenor Estate owns much of Mayfair, with long leaseholds on Georgian townhouses around Grosvenor Square, Mount Street, and Carlos Place.

Our builders are experienced with the particular demands of properties in Mayfair and provide a detailed scope of work and written quote before starting any job. All work is fully insured and guaranteed.

Cost of rear extension in Mayfair

Typical cost range: £40,000–£100,000

Prices for rear extension in Mayfair W1 depend on the scope of work, access, property type, and specification. The range above reflects typical jobs in the area. We always provide a detailed written quote — confirmed before work begins — with no hidden charges.

How long does rear extension take?

Typical timeframe: 10–16 weeks

Timescales can vary depending on the complexity of the job and any access constraints. For properties in Mayfair, we schedule work to minimise disruption and confirm the full timeline before starting.

Frequently asked questions

How much does rear extension cost in Mayfair?
Typical costs for rear extension in Mayfair W1 range from £40,000–£100,000. The final price depends on the scope of work, access, and specification. We provide a detailed written quote before any work begins.
How long does rear extension take in Mayfair?
Rear Extension in Mayfair typically takes 10–16 weeks. Timescales can vary depending on the complexity of the work and any access constraints specific to the property. We confirm the schedule before starting.
Do you need planning permission for rear extension in Mayfair W1?
Whether planning permission is required for rear extension in Mayfair depends on the property type, conservation area status, and scope of work. We advise on all consent requirements during the quoting process and handle applications where needed.

Other builder services in Mayfair