Westminster is not a typical London borough. The rules that apply to a semi-detached house in the suburbs simply do not apply here in the same way — and most homeowners only discover that after they've already started work. If your property is in W1, SW1, WC2 or anywhere in between, WhatCanIBuild can show you what's actually been approved for properties like yours, not just what the general rules say.
The short version
- Westminster is almost entirely covered by conservation areas, which dramatically restricts what you can do without permission
- Article 4 directions have removed permitted development rights across large parts of the borough
- What applies to your neighbour's house may not apply to yours — even on the same street
Most of Westminster is a conservation area — and that changes everything
Conservation area status doesn't just mean your building looks historic. It means that work you might assume is straightforward — changes to windows, front doors, roof materials, even some external painting — can require a full planning application. Westminster has an unusually high concentration of conservation areas covering most of its residential streets.
But here's what most homeowners don't realise: being in a conservation area is only the starting point. The real question is what that designation means for your specific project, on your specific property, in the eyes of Westminster City Council. That's not something a general guide can answer.
Article 4 directions: the rule that quietly removes your rights
Permitted development rights allow homeowners to carry out certain work without applying for planning permission — but a local council can remove those rights using something called an Article 4 direction. Westminster has issued Article 4 directions across extensive parts of the borough.
If your property is covered by one, work you thought was automatically permitted suddenly isn't. Changes to front elevations are a common trap — Westminster requires planning permission for many of these where other boroughs would not. Most homeowners don't know an Article 4 direction applies to their property until they're already in trouble.
Listed buildings
If your property is listed — or attached to a listed building — an entirely separate consent regime applies on top of everything else. Listed building consent is required for works that would affect its character, inside and out. Westminster has a very high density of listed buildings.
The same project, two different outcomes — on the same street
This is where Westminster gets genuinely complicated. Two houses, side by side, can have different planning histories, different Article 4 directions, different conservation area sub-designations, and different records of what's been approved or refused nearby. What sailed through for your neighbour three years ago might be refused for you today — or vice versa.
General rules don't account for this. Neither does asking a neighbour. The planning decisions that matter are the ones made for properties like yours, with your combination of constraints, in your specific street. That's the kind of detail WhatCanIBuild surfaces — not just whether you're in a conservation area, but what that has actually meant for similar projects nearby, and what your approval odds look like given everything that applies to your address.
Why guessing is a risk you don't need to take
Unauthorised work in Westminster doesn't quietly disappear. Enforcement action is a real possibility, and retrospective permission is never guaranteed. The cost of getting it wrong — financially and in terms of time — is significant. Before you commit to any project, the best way to understand your actual position is to check what the data says about your specific property. WhatCanIBuild gives you a picture that goes well beyond what any article can tell you.
These rules vary by property
Conservation areas, Article 4 directions, and other constraints can change everything. Check what actually applies to your address.
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