Do I Need Planning Permission for a House Extension?
10th September 2026
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Adding an extension can be an excellent way to create more space without moving home, but one of the first questions homeowners often ask is: “Do I need planning permission for a house extension?” MJ Parsons explains some of the key considerations homeowners should understand before starting a building project.

Not every extension requires a full planning application. Some projects may fall under permitted development rights, provided they meet specific requirements relating to factors such as size, height, location and the existing property.

For example, restrictions can apply to how far an extension projects from the original house, its overall height and how much of the garden can be covered by development. There can also be additional rules for properties in conservation areas or other designated locations.

Where a proposed extension falls outside permitted development rights, planning permission may be required. Building regulations can also apply, even where planning permission is not needed. These requirements relate to areas such as structural safety, insulation, ventilation, fire safety and drainage.

Because every property and project is different, homeowners should establish what permissions and approvals are required before work begins. MJ Parsons provides building services for homeowners looking to improve and extend their properties, helping turn plans for additional space into practical building projects.

Getting the right advice at the planning stage can help homeowners avoid unnecessary delays, unexpected costs and complications further down the line.

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Emily S

Member since: 23rd January 2025

I’m a Business and Digital Marketing graduate with a passion for helping small businesses thrive on social media. With a strong focus on creative strategies and data-driven insights, I love crafting impactful...

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