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Why your local authority matters when extending

3 min read
• by Ellie Manifold
Published Jul '18 • Last updated Oct '25

Quick summary

Your local authority matters because they control whether you need planning permission for extensions or external work. They usually decide within eight weeks for householder projects, or thirteen weeks for larger developments. Restrictions are tighter in conservation areas, but they can often work with you to find a suitable solution. Always check your local authority’s rules before starting.

If you’ve decided to take the plunge into extending your home, there’s someone (or some people) you’re going to have to become very acquainted with - your local authority.

Your local planning authority is the body that oversees what builds, extensions, and home renovations occur in your area. Think of them as the gatekeepers of home improvement.

So how will your local authority affect your project? Find out here...

When do you need to contact your local authority?

You’ll need to get in touch with your local authority for both planning permission and when using your permitted development rights. Though your permitted development rights allow you build up to a certain point, you’ll still need a lawful development certificate if you want to sell your home down the line.

With this in mind, you’ll have to contact your local authority if you plan on doing work to the external appearance of your home. This includes: extensions, new windows, new doors, and sometimes even adding a satellite dish.

How vigilant and strict your local authority is will depend on whether or not you live in a conservation area. If you do live in a conservation area, you’ll find you’re much more restricted in what you can do with your property. Yet don’t despair, a good architect will be able to work with your local authority to still get you a great design, even with limitations.

How much does an architect charge?

What a planning application should consist of:

Once in contact with your local authority, you’ll need to submit a planning application. This should include...

  • The standard application form, filled out with the relevant information
  • Information specified on an LPA’s local list
  • Mandatory national information requirements, such as a design and access statement

However, it’s important to remember that if Resi are your chosen architects we handle a lot of this process for you.

How do LPAs work?

Once you’ve submitted your application, the LPA usually has up to eight weeks to make a decision on householder cases, and up to thirteen weeks for the more major projects, such as business sites or large housing.

Right from the get go, the LPA will publicise the applications they have received, so that those affected have a chance to express their views. They do so through such methods as sending notices to neighbours, or posting in the local newspaper.

Once the assessment of the project has been concluded, the planning officer assigned to the case will approve or reject the application, and the LPA will send a letter notifying the homeowner of its decision.

What the LPA base their decision on:

  • The number, size, layout, siting and external appearance of buildings
  • Any possible landscaping requirements
  • What the development will be used for
  • The infrastructure available, for example roads and water supply, and proposed means of access
  • Most importantly: the likely impact on the surrounding area

How do I find my LPA?

There are many ways to find your LPA, but we recommend using the search engine on Resi’s website in order to get an accurate result. Another good way would be to go through the online Planning Portal.

How much does an architect charge?

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