How much does planning permission really cost in Camden?

Most Camden homeowners start by googling the application fee. That's reasonable — but it's also where the false confidence begins. The number you find is only one part of what you'll end up paying, and whether your application even succeeds depends on factors that have nothing to do with the fee itself. Tools like WhatCanIBuild exist precisely because the gap between "what does planning permission cost?" and "what will it actually cost me?" is bigger than most people expect.

The £258 fee is just the entry ticket

Yes, the standard householder application fee in Camden is £258. But that figure assumes your application goes in clean, gets decided first time, and doesn't require any professional support to get there. In practice, that's rarely how it plays out.

If you submit through the Planning Portal, there's an additional service charge of £75.83 plus VAT on applications over £100. That's before you've paid anyone to draw up plans, write a design statement, or advise you on whether your project is even likely to succeed.

Most homeowners don't realise that a refused application doesn't come with a refund. If your application is withdrawn or refused, the fee goes with it. That changes the risk calculation entirely.

Camden isn't a typical London borough — and that matters

Camden has over 40 conservation areas. Hampstead, Belsize Park, Bloomsbury — these aren't just postcodes, they're planning environments with their own rules layered on top of the national framework. Many of these areas carry Article 4 directions, which remove permitted development rights that would otherwise let you work without permission at all.

What does that mean for your project? It depends on your property. The same extension that sails through in one part of NW3 might trigger a full application — and a much harder conversation — two streets away. Most homeowners don't realise their property might sit in a conservation area, an Article 4 zone, or both, until they're already mid-process.

Listed buildings add another layer entirely. No application fee is required for listed building consent — but that doesn't make it simpler. It usually makes it harder, slower, and more expensive to get right.

The hidden costs most people don't budget for

Professional fees — architects, planning consultants, heritage consultants in sensitive areas — often dwarf the application fee itself. And those costs go up if your project is complex, your site is constrained, or your first application doesn't succeed.

Then there's time. Camden's typical decision window is 8 weeks for straightforward householder applications. But applications in conservation areas, or those that attract objections, can run longer. Every week of delay has a cost — sometimes financial, sometimes just the frustration of a project stalling.

The question isn't just "what does planning permission cost in Camden?" It's "what will it cost for my specific property, my specific project, and my specific combination of constraints?"

The best way to get a real picture before you spend anything is to use WhatCanIBuild — not just to check whether you're in a conservation area (you can find that yourself), but to see what's actually been approved and refused on your street, what approval odds look like for your project type, and how your property's specific constraints combine to affect your chances.

Knowing you're in Hampstead's conservation area is one thing. Knowing what that actually means for a rear extension on your specific house — based on what's happened to similar projects nearby — is something else entirely.

WhatCanIBuild shows you the second part.