What is Prior Approval and When Do You Need It?
Prior approval is often confused with planning permission. This guide explains what prior approval is, when you need it, and how the process works.
What is Prior Approval?
Prior approval is a lighter-touch process that allows the local planning authority to consider specific aspects of a proposed development before you can proceed. It's not full planning permission, but it's more than simple permitted development.
When is Prior Approval Required?
For residential extensions, prior approval is required for larger single-storey rear extensions:
- **Detached houses:** Extensions between 4m and 8m depth
- **Semi-detached/terraced:** Extensions between 3m and 6m depth
Prior approval covers the impact on amenity of adjoining premises, specifically: • Whether the extension would overshadow neighbouring properties • Whether it would be overbearing • Whether it would cause loss of privacy
The Prior Approval Process
**Step 1: Submit Application** Apply to your local planning authority with plans and the application fee (usually around £120).
**Step 2: Neighbour Notification** The council notifies adjoining neighbours who have 21 days to comment.
**Step 3: Decision** The council has 42 days to make a decision. If they don't respond within this time, you can proceed as if approval was granted.
**Possible Outcomes:** • Prior approval not required (you can proceed) • Prior approval granted (you can proceed) • Prior approval refused (you cannot proceed under PD, but can apply for full planning permission)
Key Differences from Planning Permission
- **Simpler application:** Less documentation required
- **Faster decision:** 42 days vs 8+ weeks for planning
- **Limited scope:** Only certain impacts are considered
- **Lower fee:** Usually cheaper than planning applications
- **Time-limited:** Some prior approvals expire if work doesn't start within a certain period
Summary
Prior approval provides a middle ground between simple permitted development and full planning permission. If your extension requires prior approval, don't be deterred – the process is straightforward and usually faster than a full planning application.