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Home Extension Permitted Development

Permitted Development Rights Explained

6 February 2026

Many home improvements can be carried out without planning permission under permitted development rights. Find out what you can and can’t do without applying to the council.

Permitted development (PD) rights allow homeowners to make certain changes to their property without needing to apply for planning permission. Understanding these rights can save you time and money.

What You Can Typically Do Under PD

  • Single-Storey Rear Extensions: Up to 3 metres from the rear wall (semi-detached) or 4 metres (detached). Under the larger home extension scheme, this increases to 6m and 8m respectively, subject to prior approval.
  • Loft Conversions: Up to 40 cubic metres (terraced) or 50 cubic metres (detached/semi-detached), provided they don’t exceed the existing roof height.
  • Outbuildings: Garden sheds, summerhouses, and similar structures, provided they meet size and height restrictions.
  • Fencing and Walls: Up to 2 metres high (1 metre if adjacent to a highway).

When PD Rights Don’t Apply

PD rights are more restricted for flats, maisonettes, listed buildings, and properties in conservation areas, Areas of Outstanding Natural Beauty (AONBs), or National Parks. Some local authorities also issue Article 4 directions that remove specific PD rights.

Getting It Right

Even when PD applies, you must still comply with building regulations. We recommend applying for a Lawful Development Certificate to confirm your project qualifies. Young’s Construction can guide you through the process from start to finish.