Planning permission in Bexley isn't a simple yes or no — and most homeowners only discover that after they've already started something they shouldn't have. The rules that apply to your neighbour's house may not apply to yours, and the gap between assuming you're fine and actually knowing is wider than you'd think. Tools like WhatCanIBuild exist precisely because general guidance rarely tells you what you actually need to know about your specific address.
The short version
- Planning rules in Bexley vary by street, property, and project type — not just borough-wide
- Green Belt designations, conservation areas, and Article 4 directions can all strip away rights you assumed you had
- The best way to know where you stand is to check your specific property, not rely on what worked for someone else
Bexley isn't one place — it's dozens of different planning realities
Bexley covers a wide stretch of south-east London, from the urban edges of SE2 and SE9 out through DA5 to DA18. That range matters. Properties to the south and east sit within or near the Green Belt, where permitted development rights — the rights that let you build without applying for permission — are significantly restricted. But even within the same postcode, two houses on the same street can be subject to entirely different rules depending on how they're designated, what Article 4 directions apply, and what overlapping constraints affect them.
Most homeowners don't realise that permitted development rights can be removed from individual properties, not just whole areas. So the extension your neighbour built without permission might require a full application from you — and you'd have no way of knowing without checking.
The exceptions that catch people out
Conservation areas. Listed buildings. Flood zones. Article 4 directions. These aren't obscure edge cases in Bexley — they affect a meaningful portion of the borough's housing stock. And each one changes the calculation in a different way.
Being in a conservation area doesn't automatically mean you can't do anything. But it does mean the rules are different, the scrutiny is higher, and what got approved two streets away may have no bearing on your situation. A listed building brings an entirely separate layer of consent requirements on top of standard planning. A flood zone affects what you can build at ground level. An Article 4 direction can remove permitted development rights that would otherwise apply automatically.
The problem isn't just knowing whether these designations exist — it's understanding what they actually mean for your project, on your property. That's where WhatCanIBuild goes further than a basic constraint lookup: it shows you what's been approved and refused for similar projects nearby, what the approval odds look like for your specific project type, and how your property's combination of constraints affects your chances.
Green Belt properties
If your property falls within or adjacent to Bexley's Green Belt — particularly in the DA5–DA8 and DA14–DA16 areas — your permitted development rights may be more restricted than standard rules suggest. Don't assume what applies elsewhere applies to you.
What a householder application actually involves
If you do need to apply, Bexley Council charges £258 for a householder application, with a typical decision time of around 8 weeks. But the fee and the timeline are the easy part. What determines the outcome is whether your project fits the policy context for your specific site — and that's something you won't find in a general guide.
Neighbours have the right to object. Officers have discretion. And decisions made on similar projects nearby can either support or undermine your case, depending on the details. Most homeowners don't find any of this out until they're already in the process.
Before you commit to anything — or assume you don't need to — WhatCanIBuild can show you what the planning picture actually looks like for your address: the constraints, the local precedents, and what that combination means for your project.
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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