Planning permission in Windsor and Maidenhead seems like a yes/no question — until you realise how many variables are stacked against a simple answer. With 966 listed buildings, significant Green Belt coverage, and multiple conservation areas across SL4, SL6, and beyond, what applies to your neighbour's house may not apply to yours. WhatCanIBuild can cut through that uncertainty by showing you what's actually been approved for properties like yours in this borough.
The short version
- Windsor and Maidenhead has 966 listed buildings — more than most people expect
- Green Belt land affects parts of the borough and changes what's permitted
- Conservation areas, Article 4 directions, and flood zones can all strip away rights you thought you had
- A householder planning application here costs £548 and takes around 8 weeks
Your street might be under rules you don't know about
Most homeowners assume that if a project is "standard" — a rear extension, a loft conversion, a new fence — it falls under permitted development and they're fine. Sometimes that's true. But in Windsor and Maidenhead, the patchwork of conservation areas alone is enough to make that assumption dangerous.
Conservation areas exist across Windsor town centre, parts of Maidenhead, and several villages within the borough. Inside them, certain works that would normally be permitted development require a formal application instead. But knowing you're near a conservation area is very different from knowing whether your specific property sits inside one — and what that actually means for the project you have in mind.
Then there are Article 4 directions. These are locally applied restrictions that can remove permitted development rights from specific streets or property types, often without any obvious signposting. Most homeowners don't realise they exist until they've already started planning.
Green Belt adds another layer of complexity
Parts of Windsor and Maidenhead fall within the Green Belt, where national policy applies a different test to development. This doesn't mean nothing can be built — but it does mean the scrutiny is higher and the margin for error is smaller.
If your property sits in or near a Green Belt designation, the question isn't just "do I need permission?" — it's "what are the realistic chances of getting it?" Those are two very different questions, and the answer to the second one depends on the specifics of your site, your project type, and what's been approved or refused nearby.
Listed Buildings
With 966 listed buildings in the borough, there's a meaningful chance your property — or one nearby — carries listed status. Listed building consent is a separate requirement from planning permission, and works that would be fine on an unlisted property can be refused entirely on a listed one. Even internal alterations can require consent.
What you don't know can cost you
The £548 application fee is the visible cost of getting this wrong. The invisible costs are the time lost, the builder standing by, and the enforcement risk if you proceed without the permission you needed. In a borough with this many designations and constraints layered on top of each other, the gap between "I think I'm fine" and "I am fine" is wider than most people expect.
The best way to understand what applies to your property — not just your postcode, but your specific address — is to check what's actually been decided for similar projects nearby. WhatCanIBuild shows you approval patterns, refusal reasons, and how your property's combination of constraints affects your real-world chances. That's the information that changes decisions.
If you're planning any work on a property in Windsor and Maidenhead, don't guess. The borough looks simple from the outside. It isn't. WhatCanIBuild gives you the property-level picture — the things this article deliberately can't 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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