Guide
How long does an extension take?
What affects the timescale, from approvals to handover.
What sets the pace of a build.
There isn’t a standard answer, because every extension is different. These are the main things that affect how long yours will take, from the first approvals to handover.
- South Oxfordshire
- Test Valley
- Berkshire
- Surrey
Before the build
If your extension needs planning permission, prior approval or a Lawful Development Certificate, you’ll need to allow time for the council to decide before work starts. Building regulations approval and, if it applies, a party wall agreement with your neighbours can also affect when work can begin.
During the build
- The size and complexity of the extension.
- Lead times for materials, such as glazing.
- The weather, especially during groundworks.
- Changes to the design or specification once work has started.
Your timescale
We’ll talk you through the expected timescale for your project before you commit, and your project lead will keep you updated if anything changes.
This is general guidance for England, not legal advice. The rules can change and can differ for your property, so always check with your local council before you start.
It depends on the size and complexity of the build, whether approvals are needed first, lead times for materials and the weather. We’ll talk you through the expected timescale for your project before you commit.
If you need planning permission, prior approval or a Lawful Development Certificate, you’ll need to allow time for the council to decide before work starts.
Yes. Your dedicated project lead runs the work on site and keeps you updated as it progresses, including if anything changes.
Talk to us
Tell us about your project
We’ll talk it through, come and see you if it helps, and put together a detailed proposal for your project.