Planning permission in Dacorum is one of those things that sounds simple until you start looking into your specific property. With Green Belt land covering large swathes of the borough, 23 conservation areas, and over 920 listed buildings scattered across postcodes from HP1 to WD4, the rules that apply to your neighbour's house might be completely different from yours. WhatCanIBuild exists precisely for this kind of complexity — helping Dacorum homeowners understand what's actually possible at their address, not just in general.
The short version
- Dacorum has 23 conservation areas and significant Green Belt coverage — both restrict what you can do without permission
- Over 920 listed buildings are recorded in the borough, each with its own layer of rules
- What applied to your neighbour's project may not apply to yours
Green Belt doesn't mean you can't do anything — but it does mean you need to check
Most homeowners in Dacorum assume Green Belt is someone else's problem — something that affects farmers and developers, not people who want a loft conversion or a rear extension. That assumption trips people up regularly. Green Belt designation can affect permitted development rights in ways that aren't obvious, and the boundaries don't always follow the lines you'd expect. Whether your garden backs onto protected land, or whether your plot is partly within a designated area, can change everything about what you're allowed to do without making a formal application.
Conservation areas and Article 4 directions quietly remove rights you thought you had
Dacorum's 23 conservation areas aren't evenly spread, and the restrictions within them aren't uniform either. Being inside a conservation area might limit what you can do to your roof, your windows, your front garden, or your outbuildings — even for changes that would be perfectly fine a few streets away. And then there are Article 4 directions, which can remove permitted development rights from specific streets or property types without it being at all obvious from the outside. Most homeowners don't realise these exist until they've already started planning a project. If your property sits in or near one of Dacorum's conservation areas — in places like Berkhamsted, Tring, or Kings Langley — the best way to know exactly what applies to your address is to check it directly.
WhatCanIBuild goes beyond telling you what constraints exist on paper. It shows you what's actually been approved and refused for similar projects nearby, and what that means for your specific combination of property type, location, and proposed work.
Listed buildings are a category of their own
With over 920 listed buildings in the borough, the chances that your property — or one immediately adjacent — carries listed status is higher than you might think. Listed building consent is a separate layer of control that sits on top of planning permission entirely. Work that would be fine on an unlisted house can require consent on a listed one, and the rules extend to interior work, outbuildings, and boundary structures in ways that regularly catch people out.
Don't assume your project is straightforward
Even small projects — a garden office, a new fence, a porch — can require permission depending on your property's specific designations. A £548 householder application fee is a lot less painful than enforcement action after the fact.
The question isn't just "do I need permission" — it's "what are my chances?"
Knowing you're in a conservation area is one thing. Knowing whether your specific extension, on your specific plot, in your specific part of Dacorum, is likely to get approved — that's a different question entirely. WhatCanIBuild shows you what's been decided on similar projects on your street, so you're not going in blind.
These rules vary by property
Conservation areas, Article 4 directions, and other constraints can change everything. Check what actually applies to your address.
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