How likely is my planning application to get approved in Westminster?

Planning permission in Westminster isn't a coin flip — but it's not a straightforward process either. The borough sits in a uniquely complicated position, and most homeowners only discover how complicated once they're already mid-application. Tools like WhatCanIBuild exist precisely because the answer to "will this get approved?" is almost never obvious in Westminster.

Conservation areas change everything — and Westminster is full of them

Most of Westminster falls within a conservation area. That matters because it affects what counts as permitted development, what triggers a planning application, and what officers are likely to approve. But here's the thing most homeowners don't realise: being in a conservation area isn't the whole story. Which conservation area, which street, and which side of the property all feed into how your application is likely to be assessed.

Two houses on the same road can face very different outcomes for the same project. That's not a quirk — it's by design.

Article 4 directions make common projects unexpectedly complicated

Westminster has extensive Article 4 directions across the borough. These remove certain permitted development rights that would otherwise apply — meaning projects that wouldn't need planning permission elsewhere in England do need it here.

Most homeowners have no idea whether their property is covered by one, let alone what it means for their specific project. Changes to front elevations are a common example — work that feels minor can require a full application in Westminster, and the approval isn't guaranteed.

What's been approved nearby matters more than you think

Planning decisions in Westminster aren't made in a vacuum. Officers look at precedent — what's been approved and refused on your street, in your conservation area, for your type of property. A project that sailed through for a terrace two doors down might face objections if your property has a different listing status, a different aspect, or sits within a slightly different policy area.

This is where most homeowners get caught out. They assume approval is likely because they've seen similar work nearby. But "similar" in planning terms is rarely as similar as it looks.

WhatCanIBuild shows you what's actually been approved and refused for projects like yours in your area — not just whether constraints exist, but what they've meant in practice for properties like yours.

So what are your actual odds?

The honest answer: it depends on your property. The combination of conservation area designation, Article 4 directions, listed building status, flood zone, and local planning history all interact in ways that are genuinely difficult to unpick without looking at your specific address.

Guessing — or going off what worked for a neighbour — is a risk. Westminster's planning environment is detailed and actively enforced. Applications that go in without a clear picture of the constraints tend to take longer, face more conditions, or get refused outright.

WhatCanIBuild gives you the approval odds and nearby decision history for your specific property and project type — the kind of detail that makes the difference between a confident application and an expensive mistake.