Building work in Marylebone: area guide

This is our area guide to building work in Marylebone (W1, NW1, Westminster): the housing, the council rules that apply (Westminster City Council for planning) and every service we offer here. For whole-house refurbishment go to Home renovation in Marylebone.

A large share of the work we quote for in Marylebone happens inside flats rather than houses. The blocks between Marylebone High Street and Baker Street were built as apartments and remain leasehold, so the first document that matters is not a drawing but your lease. Alongside them sit Georgian townhouses, most long since divided into upper floor flats with their own service arrangements bolted on. Either way the envelope is fixed, the value comes from replanning what sits behind it, and the freeholder has a say in the work before the council does.

Marylebone's housing, as the Council Tax list records it, is about 12,620 homes: 8% houses, 92% flats, with 54% pre-1919, 16% interwar and 29% built since 1945. VOA Council Tax stock of properties, March 2025, for Marylebone & Park Lane and Bryanston & Dorset Square. Counts rounded by the VOA.

A licence to alter comes before any Marylebone wall or stack moves

Before a structural or layout change goes ahead in a Marylebone mansion flat, the freeholder or managing agent normally issues a licence to alter. Obtaining one means submitting drawings, a specification, the contractor's insurance details and, where a wall is coming out, a structural engineer's report. We do not produce that report. We appoint a structural engineer, give them access to survey properly, and build to the design they issue. The lease usually also rules things out entirely, such as altering a soil stack shared with the flats above, which fixes where a bathroom renovation can go, or reducing the acoustic performance of a floor. Reading it early saves drawing the same kitchen twice.

Internal walls in these blocks are a mixture. Some are brick, genuinely carrying floor loads from the flats above. Others are later stud partitions from a reconfiguration decades ago. Only opening up tells you which, and the engineer's assessment follows. A brick one is a load-bearing wall removal, and its beam bearings must land on masonry that continues down through the building, not on a partition that stops one floor below. Permitted development rights do not apply to flats, so nothing here is exempt on size. Building control still governs structural work, notifiable electrics and any change to fire separation.

In a managed W1 block, access sets the order of every room

Practicalities decide the programme in W1 more than the design does. Most blocks around the High Street set permitted working hours, restrict use of the passenger lift and expect communal stairs and corridors to be sheeted before the first bag of plaster arrives. Deliveries land inside a loading window on a controlled street, so materials come in by the day rather than by the pallet, and a kitchen renovation is ordered to arrive in stages. Waste leaves the same way, bagged, often through a hallway that residents are using ten minutes later. It has to be planned, and it is why a whole-flat job here runs longer than the same rooms in a house.

Noise is the other constant. With occupied homes above, below and to either side, percussive work such as breaking out for an RSJ installation is concentrated into agreed windows, and neighbours are told in advance. One person deals with the managing agent, the porter and the residents, so you are not fielding calls about a lift booking while you are at work. The agent will want our insurance confirmed in writing before anyone starts, and installations we carry out are covered by a five year guarantee.

Where to go next for work in Marylebone: kitchen renovation in Marylebone, house extensions in Marylebone, the Westminster area guide, building work in Mayfair, building work in Soho and Full House Renovation Cost.