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How Long Does It Take to Get Planning Permission for an Annexe? Your Complete Guide

If you’re considering building a granny annexe or garden annexe, one of the most pressing questions is: How long does planning permission take? The answer depends on your local council’s processing times, the complexity of your proposal, and whether you need additional assessments.

In this guide, we’ll explain the typical planning permission timeline for annexes in the UK, what can cause hold-ups, and how to navigate the process efficiently.

Standard Planning Permission Timeline for Annexes

The standard planning permission process for an annexe typically takes 8 to 13 weeks, though this can vary. Here’s the usual breakdown:

1. Pre-Application Stage (1–4 Weeks)

  • Review local planning policies – Check if your annexe qualifies under permitted development rights (some do if they meet specific size and usage criteria)
  • Seek pre-application advice – Most councils offer this service (typically takes 2–4 weeks)
  • Engage professionals – An architect or planning consultant can help avoid costly mistakes

2. Application Submission & Validation (1–2 Weeks)

  • Submit your application via the Planning Portal
  • The council checks all documents (including drawings, forms and fees) are in order
  • Incomplete applications will be held until missing information is provided

3. Public Consultation Period (3–8 Weeks)

  • The council notifies neighbouring properties and may display a site notice
  • Neighbours have 21 days to submit comments (strong objections may cause delays)
  • Some councils take longer during peak periods

4. Case Officer Assessment (4–8 Weeks)

  • A planning officer evaluates your proposal against local planning policies
  • They may request amendments or additional reports (e.g., ecological surveys)
  • The statutory determination period is 8 weeks (extended to 13 weeks for larger schemes)

5. Decision Notice (1–2 Weeks After Assessment)

  • Approval – You’ll receive a decision notice with any planning conditions
  • Refusal – You have the right to appeal (process takes 4–6 months)

Total estimated timeframe: 8–13 weeks (assuming no significant delays).

What Can Delay Planning Permission for an Annexe?

Several factors can prolong the process:

  • Neighbour objections – Significant opposition may require additional negotiations
  • Incomplete submissions – Missing documents or incorrect forms
  • Council workload – Some authorities have longer processing times
  • Protected species surveys – Required if your site contains biodiversity features
  • Design conflicts – Proposals that contravene local planning policies

How to Expedite Your Application

  • Check permitted development options – Some annexes don’t require full planning permission
  • Use pre-application services – Identify potential issues before formal submission
  • Instruct a planning consultant – Professionals know how to navigate the system efficiently
  • Submit a watertight application – Ensure all required documents are included
  • Research council performance – Some local authorities process applications faster than others

What If My Application Is Refused?

If your annexe planning application is unsuccessful, you can:

  • Revise and resubmit – Address the council’s reasons for refusal
  • Launch an appeal – Takes 4–6 months but may be worthwhile if the decision appears unreasonable

Key Takeaways

While most annexe planning applications are determined within 8–13 weeks, delays can occur. Proper preparation – including checking permitted development options and seeking professional advice – can significantly smooth the process.

For expert assistance with your project, Anxspace specialises in annexe planning applications and can guide you through every stage. Contact them today to ensure your application stands the best chance of success.