How likely is my planning application to get approved in Southwark?

Planning permission in Southwark feels like it should be predictable. You submit, they decide. But the gap between 'I think this will be fine' and 'I understand what's actually going to happen' is enormous — and most homeowners only discover that gap after they've paid their fees and waited eight weeks for a refusal.

WhatCanIBuild cuts through that uncertainty by showing you what's actually been approved and refused near your property — and why.

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

SE1 and SE22 are both Southwark postcodes. They are not remotely similar when it comes to planning. Southwark has an unusually high concentration of conservation areas, and the rules that apply in one street can be materially different from those two roads over. Then there are Article 4 directions — designations that remove the permitted development rights that homeowners elsewhere in England take for granted.

Most homeowners don't realise their property might already be subject to restrictions that change everything about their application before they've even started. Whether those restrictions apply to your address isn't something you can guess from a postcode.

The Thames boundary adds a layer most people never consider

Southwark's northern edge runs along the Thames, and flood zone considerations don't stop at the riverbank. Properties across a significant portion of the borough sit within areas where additional assessments can be required — assessments that affect both whether you need planning permission and whether you're likely to get it.

Layered on top of that are strategic view corridors protecting sightlines to landmarks across London. These aren't theoretical. They have already influenced what gets approved and what doesn't on specific streets in Southwark, and they don't advertise themselves on the tin.

What your approval odds actually depend on

It's not just whether you're in a conservation area or a flood zone in isolation. It's the combination of constraints on your specific property, plus the pattern of recent decisions on similar projects nearby. A rear extension in one part of SE15 might sail through. The same extension on a different street with a different orientation, a different listing status, or a different Article 4 direction applied could face a very different outcome.

That's the kind of pattern that's buried in planning records — and that most homeowners have no practical way to surface before they commit to an application.

The best way to understand your actual approval odds is to look at what's happened to properties like yours, on streets like yours, with a project like the one you're planning. WhatCanIBuild does exactly that — pulling together the approval and refusal history near your address so you're not going in blind.

Southwark isn't hostile to homeowners wanting to improve their properties. But it is a borough where the gap between 'probably fine' and 'actually approved' is wide enough to matter. Before you spend £258 on a fee and eight weeks on a decision, it's worth knowing which side of that gap you're likely to fall on.

WhatCanIBuild shows you the picture your council won't hand you — the real approval landscape for your property, not the borough average.