How much does planning permission really cost in Dacorum?

Most homeowners in Dacorum start with one question: how much will planning permission cost? The honest answer is that the fee is the easy part — it's everything around it that catches people out. WhatCanIBuild exists precisely because the full picture is almost impossible to piece together without knowing what applies to your specific address.

The fee you know about — and the ones you don't

The £548 householder fee is a fixed government charge. But it's rarely the only thing you'll pay. Most homeowners don't realise that this fee covers the application only — not the drawings, reports, or professional help you may need to get the application accepted in the first place.

Depending on your project, you might also need an architect, a planning consultant, an arboricultural report if there are trees involved, or a heritage statement if your property sits in one of Dacorum's 23 conservation areas. Each of those adds cost. None of them is optional if the council requires it.

And if your application is refused? The fee is non-refundable. Submitting something that was never likely to succeed is an expensive mistake.

Dacorum's constraints make costs unpredictable

Dacorum is not a straightforward borough. Green Belt land covers significant stretches of it — including areas in and around the HP1–HP4 and HP23 postcodes. If your property sits in the Green Belt, the rules governing what you can do without permission are tighter, and the bar for getting permission when you do need it is higher.

Then there are the conservation areas. Dacorum has 23 of them. Whether your home falls within one — and which one — changes what you're allowed to do without applying at all, and what additional scrutiny your application faces if you do. Two houses on the same street can face completely different requirements.

Around 920 listed buildings are recorded across the borough. If yours is one of them, or if it sits near one, that matters too. Listed building consent is a separate process with its own requirements — and no application fee, but potentially significant professional costs.

What the fee calculator won't tell you

The Planning Portal's fee calculator will give you the application fee. What it won't tell you is whether your project is likely to be approved, what similar applications nearby have cost their owners in total, or how your property's specific combination of constraints will be treated by Dacorum Borough Council's planning officers.

That's the gap most people fall into. They budget for the fee and underestimate everything else — the preparation, the professional input, the time, and the risk of refusal.

The best way to understand what your specific project is actually up against — including what's been approved and refused for similar homes nearby, and what your approval odds look like — is to check your address on WhatCanIBuild. It surfaces the things this article deliberately can't tell you, because they depend entirely on where you live.

WhatCanIBuild shows you the real picture for your property — not just the constraints, but what those constraints have actually meant for projects like yours in Dacorum.