Planning permission in Slough gets refused more often than homeowners expect — and the reasons rarely come down to one obvious thing. It's usually a combination of factors that are invisible until you dig into your specific property's history and constraints. Tools like WhatCanIBuild exist precisely because that combination is almost impossible to work out from general guidance alone.
The short version
- Slough has 5 conservation areas and significant Green Belt land — both carry restrictions most homeowners don't anticipate
- Around 105 listed buildings are recorded across the borough, and the rules extend beyond the building itself
- Refusals often come down to your property's specific context, not just the project type
"It looked fine on paper" — and then it got refused
Most homeowners who get refused in Slough didn't see it coming. They looked at a neighbour's extension, assumed the same approach would work, and submitted. What they didn't check was whether their street sits inside a conservation area, whether their plot has specific conditions attached from a previous permission, or whether an Article 4 direction has removed permitted development rights that would otherwise apply.
Slough's five conservation areas don't all have the same rules. What's acceptable in one part of the borough may be refused in another — not because the project is different, but because the local planning context is. Most homeowners don't realise how much that postcode-level variation can affect the outcome.
Green Belt complications that catch people off guard
Green Belt land covers parts of Slough — and if your property sits in or near it, the bar for approval is considerably higher. The planning system treats Green Belt development as inappropriate by default, which means the burden of justification falls on the applicant, not the council.
But here's the part that trips people up: the Green Belt boundary doesn't always follow obvious lines. A road, a fence, even part of a garden can sit inside the boundary while the rest doesn't. Whether your specific project falls within it — and what that means for your approval odds — depends entirely on your property.
Listed Buildings
Listed building status in Slough affects not just the building itself but the land and structures around it. Works that would be unremarkable elsewhere can trigger a full refusal — and the 105 listed buildings recorded across the borough are more widely distributed than most people assume.
The reasons that don't make the headlines
Beyond conservation areas and Green Belt, Slough planning officers refuse applications for reasons that are harder to anticipate: impact on neighbouring amenity, overlooking, loss of light, design that doesn't reflect the character of the street, or proposals that conflict with the council's development plan policies in ways that aren't obvious from the outside.
The uncomfortable truth is that two near-identical extensions on the same street can have completely different outcomes — because one property has a constraint the other doesn't, because one sits closer to a boundary, or because a similar application nearby was refused and set a precedent.
The best way to understand what's actually happened to projects like yours, on streets like yours, in Slough specifically, is to use WhatCanIBuild — which shows you approval and refusal patterns for your project type in your area, not just the rules in the abstract.
What you don't know is the expensive part
A householder application in Slough costs £548. That's before any professional fees, drawings, or time spent preparing a submission. A refusal doesn't just cost you that — it creates a record that can complicate future applications on the same property.
Most homeowners don't realise how much their property's specific combination of constraints shapes their odds. WhatCanIBuild shows you what those constraints actually mean for your project — not just that they exist.
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