Most homeowners searching for this answer are hoping for a simple number. There is one — £258 for a standard householder planning application in Lambeth — but whether that's all you'll pay, or whether you'll need permission at all, depends entirely on your specific property. It's rarely as straightforward as it looks, and WhatCanIBuild exists precisely because the gap between the headline fee and your actual situation is where most people get caught out.
The short version
- The householder application fee in Lambeth is £258
- An additional £75.83 + VAT service charge applies to online applications submitted through the Planning Portal where the fee exceeds £100
- That's the fee — but your total cost depends on factors most homeowners don't know to check
The fee is just the beginning
Pay £258 and you've submitted an application. But that assumes you're submitting the right type of application, for a project that actually needs permission, on a property with no additional constraints. Each of those assumptions can be wrong — and in Lambeth, they frequently are.
Lambeth has over 60 conservation areas. If your property sits within one, what you're allowed to do without permission can change significantly. And if your street falls under an Article 4 direction, permitted development rights that most homeowners take for granted may have been removed entirely. Most people don't know whether their property is affected until something goes wrong.
Then there's listed building status. If your home is listed — or even if it's not listed but sits within a listed building's curtilage — you may need a separate consent, and that changes the fee structure and the process entirely.
Don't assume your neighbour's project sets the precedent
Two houses on the same street can face completely different rules depending on their individual planning history, any conditions attached to previous approvals, and exactly where conservation area or Article 4 boundaries fall. What worked next door may not apply to you.
What most homeowners don't realise about Lambeth specifically
Lambeth's conservation areas aren't evenly distributed across the borough — they're concentrated in specific streets and pockets, sometimes cutting through the middle of a road. Whether you're inside or outside a boundary can determine whether your loft conversion, rear extension, or outbuilding needs a full application or nothing at all.
Article 4 directions add another layer. In many of Lambeth's conservation areas, these directions specifically remove permitted development rights for front-facing changes — but the scope varies. Knowing you're in a conservation area is not the same as knowing what that means for your particular project on your particular property.
And even when permission is granted, conditions attached to the approval can create costs you didn't budget for — pre-commencement surveys, material matching requirements, or restrictions that affect how and when you build.
The numbers you can't Google
The £258 fee is public. What isn't public — or at least not easy to find — is how applications like yours have actually performed in your part of Lambeth. Which project types get approved on your street. What reasons councils have given for refusals on similar schemes nearby. Whether your specific combination of constraints — conservation area, Article 4, property type, extension size — has a track record you should know about before you spend money on architect drawings.
That's the information that actually tells you what your project will cost, and whether it's worth pursuing. The best way to see what's been approved and refused near you, and what your approval odds look like for your specific project type, is to run your address through WhatCanIBuild.
It won't just tell you whether you're in a conservation area. It'll show you what that actually means for a project like yours — based on real decisions, on real streets, in Lambeth.
WhatCanIBuild pulls together the constraints, the local decision history, and the approval patterns that no fee guide can give you. Enter your address and see what your project is actually up against.
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