Do I need planning permission in Lambeth?

Planning permission in Lambeth isn't a simple yes or no — it depends on your property, your street, and sometimes the specific changes you're making. What's fine for your neighbour might need full planning consent for you, and most homeowners don't realise that until it's too late. WhatCanIBuild cuts through that uncertainty by checking what actually applies to your address.

Lambeth isn't one place — it's dozens of different planning environments

Lambeth covers a wide stretch of south London, from Waterloo and Vauxhall down through Brixton, Streatham, and Herne Hill. The postcodes alone — SE1, SE5, SE11, SE24, SW2, SW4, SW9 — span wildly different property types, street characters, and planning histories. A Victorian terrace in Clapham Old Town sits in a completely different planning context to a mid-century flat in Stockwell, even if they're a mile apart.

Conservation areas are one of the biggest variables. Lambeth has over 60 of them. Being inside one changes what you can and can't do — but being inside one doesn't tell you what that means for your project. Two streets in the same conservation area can have different constraints depending on how the area was designated and what Lambeth's local planning policies say about it.

The rule that catches most homeowners off guard

Even if your project would normally fall under permitted development — meaning you'd typically be allowed to proceed without applying — Lambeth may have removed those rights through an Article 4 direction. These are particularly common in conservation areas, and they often target front-facing changes: things like replacing windows, altering a front door, or changing roofline details.

Most homeowners don't realise Article 4 directions exist until they've already started work or received an enforcement notice. They're not visible from the street. They don't come up in a Google search. And they vary by area, by street, and sometimes by individual property.

What your neighbours' extensions don't tell you

Seeing a loft conversion or rear extension on your street is not evidence that you can do the same. Previous approvals reflect the planning context at the time — which may have changed. They reflect the specific details of that application, which may differ from yours. And if a neighbour built without permission, their project being unchallenged isn't a green light for yours.

The best way to understand your actual position isn't to look at what's around you — it's to check what's been approved and refused for projects like yours, on streets like yours, in your specific planning context. WhatCanIBuild shows you that picture: not just whether constraints exist on your property, but what they've meant in practice for similar projects nearby.

What you actually need to know

Knowing you're in a conservation area is the start of the question, not the answer. The answer is what that conservation area designation, combined with your property type, your project, and Lambeth's local planning record, actually means for your chances of getting permission — or whether you need it at all.

Householder applications in Lambeth carry a fee of £258 and a typical decision time of 8 weeks. But the real cost of getting it wrong is higher than the fee. WhatCanIBuild gives you the property-specific picture before you commit to anything.