Planning Permission for Extensions in South & West Wales

Planning Permission for Home Extensions in Carmarthenshire, Pembrokeshire & Ceredigion

Introduction

If you’re thinking about adding an extension to your home, you might be wondering whether you need planning permission. In South and West Wales, the rules can vary depending on the type of extension, your property’s location, and local council regulations. Understanding when permission is required can save you time, money, and potential enforcement issues.

When Planning Permission is Usually Required

You will generally need planning permission if your proposed extension:

  • Exceeds permitted development limits – most councils allow small extensions without formal permission, but larger or multi-storey projects often require approval.

  • Changes the building’s footprint – if your extension alters the size or shape significantly, it may trigger the need for permission.

  • Affects the external appearance – particularly in conservation areas or listed buildings, any visible changes may require planning consent.

  • Encroaches on protected areas – properties near coastlines, flood zones, or heritage sites often have stricter rules.

When You Usually Don’t Need Planning Permission

Some smaller extensions may fall under Permitted Development Rights, meaning planning permission isn’t required. Typical examples include:

  • Single-storey rear extensions within specific size limits

  • Certain loft conversions

  • Minor roof alterations that don’t extend beyond your home’s existing footprint

Note: Even if an extension falls under permitted development, you may still need building regulations approval, which is separate from planning permission.

Tips for Avoiding Problems

  1. Check your council’s guidance – each local authority has specific rules, so always confirm with the planning department.

  2. Consult a planning expert – a professional can review your plans and advise whether permission is needed.

  3. Consider pre-application advice – many councils offer this service to reduce the risk of refusal.

  4. Document your plans carefully – clear drawings, site plans, and measurements help councils assess your application quickly.

Conclusion

Knowing whether you need planning permission is the first step to a smooth home extension. Careful planning and early advice can prevent delays and ensure your project meets all legal requirements.