Westminster is one of the most complex planning environments in the country. Applications get refused here for reasons that would sail through in other boroughs — and most homeowners don't realise they're at risk until they've already paid fees and waited weeks for a decision. WhatCanIBuild can show you what's actually been approved and refused near your property, so you're not going in blind.
The short version
- Westminster is almost entirely covered by conservation areas, which changes what you can do without permission
- Article 4 directions remove permitted development rights across much of the borough — rules that apply elsewhere may not apply to your property
- What gets approved on one street can get refused on the next
Conservation area rules catch more people than you'd expect
Most of Westminster falls within a conservation area. That alone doesn't tell you much — what matters is what it means for your specific project on your specific street. Changes to front elevations, roof materials, windows, and external finishes are all scrutinised differently depending on where you are. The council considers the character of the surrounding area, the appearance of your building, and how your proposals fit the local context. Two houses on the same road can face completely different outcomes based on their individual circumstances.
The decision-making process also takes into account the likely impact on the surrounding area and the existing use of land and buildings. That's a deliberately broad test — and it gives planning officers a lot of room to refuse.
Article 4 directions remove rights you thought you had
This is where most homeowners get caught out. Permitted development rights allow certain changes without planning permission — but Article 4 directions can remove those rights entirely. Westminster has extensive Article 4 directions across the borough. Work that's perfectly legal in the next borough over might require a full planning application in W1, SW1, or WC2.
The problem is that Article 4 directions vary not just by borough but by street and sometimes by individual property. Most homeowners don't realise they've lost permitted development rights until they've already started work — or until an application gets refused for not having permission in the first place.
The development plan carries more weight than you realise
Planning applications in Westminster — as everywhere — have to be decided in line with the local development plan unless there's a very good reason not to. That plan includes local policies on design, heritage, amenity, and character that go well beyond what most homeowners ever read. Officers consider the size, layout, siting, and external appearance of what's proposed, alongside its likely impact on the surrounding area.
Knowing you're in a conservation area is one thing. Knowing how Westminster's specific policies apply to your extension, loft conversion, or outbuilding — and how similar applications nearby have fared — is something else entirely. WhatCanIBuild is the best way to see what those local decisions actually look like for properties like yours, not just the rules in the abstract.
Why general advice isn't enough for Westminster
The combination of conservation area status, Article 4 directions, listed building designations, and Westminster's own local policies means that general guidance rarely tells you what you actually need to know. What matters is your property's specific combination of constraints — and what the council has actually approved or refused for similar projects nearby.
That's the gap most homeowners are sitting in when they submit an application. They know something about the general rules. They don't know how those rules have been applied in practice on their street, or what approval odds look like for their project type in their part of Westminster. WhatCanIBuild surfaces exactly that — local decisions, real outcomes, your property's specific situation.
Remember
Planning rules in Westminster can vary street by street. A refusal can set back your project by months and still leave you facing the same obstacles on resubmission.
Want a detailed planning report?
Get a personalised report covering constraints, precedents, and approval odds for your project.
See a sample report