Mayfair is the only one of the five where a single project routinely needs three separate permissions at the same time: Westminster planning permission, Listed Building Consent, and written approval from the Grosvenor Estate. Each has its own timeline and its own consultees. Mapping all three at the start is not optional, because none of them waits for the rest.
Conservation area coverage across Mayfair is effectively total. The entire neighbourhood sits within the Mayfair Conservation Area, and listed building concentration is among the highest in London. Any external alteration needs planning permission.
Westminster’s planning committee is notably conservative on material changes to historic facades, so expect more conditions attached to approvals than in RBKC. Determination periods vary by application type, and applications here are assessed by both the planning team and the conservation officer, who may have conflicting priorities.
Westminster’s basement policy is less restrictive than RBKC’s, and multi-storey basements are possible in principle. The listed status of most Mayfair properties is what makes the structural impact assessment more demanding. The policy rarely refuses the depth. The building refuses it first, through what the structure can take without harm to the listed fabric above.
Internal structural work to a listed building needs Listed Building Consent. What that consent covers, feature by feature, is set out on the Kensington page.
The Grosvenor Estate manages the majority of Mayfair’s residential property, and estate consent is required for structural, mechanical and decorative works even where you own the freehold. Grosvenor appoints its own surveyor to review proposals.
That is the third consent in the stack, and it is the one people discover last. The full Grosvenor regime, including the lease clauses that go beyond planning, is set out on the Belgravia page.
Every contractor vehicle here is subject to Congestion Charge and ULEZ daily charges for the whole duration of the project. On an eight-month programme, with daily van and lorry movements, transport charges alone can exceed £15,000. That is a five figure cost sitting in the preliminaries.
Ask your contractor to show Congestion Charge and ULEZ as named line items. Not as a contingency, and not as a variation later. If they are not itemised, they are either being absorbed in the margin or recovered from you further down the programme.
Delivery windows are restricted on the major streets, which pushes material deliveries into narrower slots and makes the delivery schedule a programme item rather than an afterthought. Westminster’s skip permit costs and placement restrictions are the most expensive in central London. Suspending on-street parking for construction vehicles needs a council permit with a minimum ten day notice period and a daily charge, so a change to the delivery plan mid-programme carries ten days of notice before it can happen.
Mayfair carries the highest renovation costs of the five boroughs. The triple consent layer, listed building compliance and Westminster’s logistics charges all compound, and none of the three offsets another. Professional fees run 12 to 15% of construction cost, against 8 to 10% in less restricted boroughs, because three consent regimes need three sets of drawings, submissions and consultant time rather than one.
Typical programme 24 to 40 weeks. Pre-construction 12 to 20 weeks.
All three, together. None of them waits for the others, and each has its own consultees, so running them in sequence adds their timelines together instead of overlapping them. The mapping exercise at the start is what decides whether the three run concurrently or one at a time.
Usually yes, where the property sits within the estate. Ownership of the freehold does not remove the estate’s consent requirement for structural, mechanical and decorative works. It is a separate regime from planning, enforced separately.
Westminster’s basement policy is less restrictive than RBKC’s, so it is possible in principle. The limit is usually the building rather than the policy. Most Mayfair properties are listed, and listed status makes the structural impact assessment considerably more demanding.
It lengthens the determination. Applications here are assessed by both, and their priorities can conflict, particularly on material changes to a historic facade. The practical answer is to resolve the material question before submission rather than during it.
Because they run daily for the length of the programme, and on an eight-month job they exceed £15,000 in preliminaries alone. A quote that does not name them has either absorbed them or is planning to recover them later as a variation.
This site uses analytics cookies to measure how it is used. Accept to allow them, or reject to keep them off. See the cookie policy.