Mayfair · W1
House extensions in Mayfair.
Additions that read as if they were always there.
Why Ushii in Mayfair
Ushii delivers extension work across Mayfair (W1) with directly employed trades. Not a broker, not a list of numbers passed to whoever is free that week. The carpenters, roofers, electricians and gas engineers on your Mayfair site are on our payroll, which is why programmes hold and standards stay consistent from strip out to snagging.
Mayfair works are rarely straightforward. Grade II listed terraces on Mount Street, floors in mansion blocks off Park Lane, family-office headquarters behind Georgian facades on Grosvenor Street. The pattern is consistent: expensive material, tight programme, private client, and no tolerance for unfamiliar faces turning up in the wrong colour van. We deliver with our own people, every one directly employed by us.
Prime central planning departments expect measured drawings, heritage statements and a considerate constructors approach to hours, deliveries and noise. We prepare all of it before a single tool arrives on site.
The best extensions do not announce themselves. Brick coursing lines up. Ridge heights sit down. New glazing frames the garden without stealing focus from the original house. We build extensions the way conservation officers wish everyone did.
What the work covers
House Extensions for Mayfair properties.
Feasibility
Planning constraints reviewed alongside your brief before drawings begin.
Coordination
Party wall, structural engineer and building control managed on your behalf.
Craft
Traditional trades and modern envelope detailing working together.
Common questions
House extensions in Mayfair, answered.
How much does a extension cost in Mayfair?
Cost follows scope, access and the condition of the building rather than the postcode. After a survey in Mayfair we issue a fixed, itemised price so you can see exactly what each element of the extension carries. There are no provisional sums hidden in the back pages.
Do you work on grosvenor estate townhouses in Mayfair?
Regularly. Grosvenor Estate townhouses, Mount Street apartments, Park Lane laterals all feature in our Mayfair workload, and each one is surveyed on its own terms before we price anything.
Which areas near Mayfair do you cover?
We work across Belgravia, Marylebone, St James's, Knightsbridge, Fitzrovia and the wider London area, with a directly employed team rather than local trades brought in for the day.
Do we need planning permission?
Many rear extensions fall under permitted development. Anything on a listed building, in a conservation area or beyond PD limits will need consent. We assess this at feasibility.
How do you match old brickwork?
We take physical samples to a handmade brick supplier and dry-lay panels for you to approve before ordering.