Bromley is one of London's largest boroughs — and one of the most complicated when it comes to planning. Between the Green Belt in the south, a string of conservation areas, and a scattering of listed buildings, the rules that apply to your neighbour's house might be completely different from the ones that apply to yours. Most homeowners don't realise that until it's too late. The best way to get ahead of it is to see what constraints are actually stacked against your specific property — free, in about a minute.
The short version
- Bromley has significant Green Belt land around Biggin Hill, Orpington, and Downe — with tighter rules than standard suburban areas
- Conservation areas in Keston, Chislehurst, Shortlands, Farnborough Village, and Hayes each carry their own restrictions
- Article 4 directions and listed building status can strip away rights you assumed you had
The Green Belt problem most homeowners miss
If your postcode is BR5, BR6, BR7, or parts of the outer SE areas, there's a real chance some or all of your plot sits in or near Green Belt land. Properties here face restrictions on how much you can extend, what outbuildings you can add, and what that coverage means relative to your original house footprint. The calculation isn't always obvious — and what was already built on the plot before you bought it counts against you.
The issue is that Green Belt boundaries don't follow street lines neatly. Two houses on the same road can sit in entirely different planning zones. It depends on your property, not your postcode.
Conservation areas are not all the same
Chislehurst, Keston, Shortlands, Hayes, Farnborough Village — Bromley has multiple designated conservation areas, and they don't all carry identical restrictions. Work that's straightforward on a standard suburban semi can require a full planning application in a conservation area. That includes things many homeowners treat as routine: certain types of cladding, replacing windows, adding a porch, or even altering a front boundary wall.
Being in a conservation area tells you something. It doesn't tell you what that means for your specific project on your specific house. The best way to understand your real exposure is to check what's actually been approved and refused for properties like yours in Bromley.
Article 4 directions — the rule most people have never heard of
Article 4 directions allow Bromley Council to withdraw permitted development rights in specific areas. Where one is in place, work you'd assume was automatic — a rear extension, a loft conversion, even a satellite dish — can suddenly require a formal application. Most homeowners have never heard of an Article 4 direction. Many live under one without knowing it.
Listed buildings add another layer
Down House, properties around Chislehurst, and buildings in Farnborough Village carry listed building status. Even internal alterations can require consent. If your property is listed — or shares a boundary with one — the rules shift significantly.
What this means for your project
Bromley's planning picture isn't just complex in the abstract. It's complex in ways that are specific to your street, your plot, and your house's history. A loft conversion that sailed through for someone in Bromley town centre might face serious resistance half a mile away in a conservation area. An extension that looks permitted development on paper might breach Green Belt coverage rules you didn't know applied to your garden.
The approval record for your street — what's been granted, what's been refused, and why — tells you far more than any general guide can. WhatCanIBuild pulls together that local precedent so you can see your property's real approval odds before committing to plans or a £548 application fee — free, no signup needed.
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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