What planning rules in Hart catch homeowners out?

Hart District looks like quiet, suburban Hampshire on the surface — but underneath, it has one of the most layered planning environments in the South East. With 39 conservation areas, 47 Article 4 directions, and 1,901 listed buildings spread across postcodes like RG27, GU51, GU52, and GU46, what applies to your neighbour's house may not apply to yours. Tools like WhatCanIBuild exist precisely because that complexity is almost impossible to navigate from the outside.

Permitted development isn't as straightforward as it sounds

Most homeowners assume that common projects — a rear extension, a loft conversion, new cladding — fall under permitted development and don't need a planning application. Sometimes that's true. But "permitted development" comes with conditions that vary depending on what your property is, where it sits, and what overlapping designations apply to it.

In Hart, that last point is the one that catches people out. A house on one side of a street might sit inside a conservation area. The house opposite might not. One property might be subject to an Article 4 direction that removes rights that the house next door still has. Most homeowners don't realise any of this until after they've started work — or after they've submitted an application that gets refused.

Conservation areas and Article 4 directions: the silent restrictions

Hart's 39 conservation areas cover a significant number of streets across the district, from Fleet to Hook to the villages around Hartley Wintney. Inside these areas, the rules around what you can do to the outside of your home change — but the boundaries aren't always obvious from the street.

Article 4 directions go further. These are locally applied restrictions that remove specific permitted development rights from defined streets or properties. There are 47 of them in Hart. They don't get advertised on your property listing. They don't show up unless you know where to look. And if you carry out work that would normally be permitted development but your property is covered by an Article 4 direction, you may find you've carried out unauthorised development — even if your neighbour did the same thing with no issues at all.

The gap between knowing the rules exist and knowing what they mean for you

This is where most homeowners get stuck. You might know you're in a conservation area. But knowing that and understanding what it actually means for your specific extension, your dormer window, your replacement windows or your outbuilding — those are two very different things.

The best way to close that gap isn't to read guidance and hope your situation matches the examples. It's to check what has actually happened on your street. What projects were approved nearby? What was refused, and why? What does your property's specific combination of constraints mean for the type of work you're planning? WhatCanIBuild surfaces exactly that — local approval patterns, nearby decisions, and what your specific address is actually subject to.

With a householder application costing £548 and taking up to 8 weeks, finding out you needed permission after the fact — or that your application was always likely to fail — is an expensive mistake. The best way to avoid it is to check your property before anything else.

WhatCanIBuild shows you what rules apply to your address, what's been approved and refused nearby, and what your project's chances actually look like in Hart — not in theory, but based on what's really happened in your area.