Planning Permission Guide UK 2025 — Do You Need It? Permitted Development & Appeals
Many home improvement projects — including extensions, loft conversions, and outbuildings — can be carried out under Permitted Development Rights without planning permission. But the rules are complex, vary by property type, and can be removed by Article 4 directions. This guide helps you check whether your project needs permission and what to do if refused.
Permitted Development Rights can be removed by Article 4 directions, conditions on previous planning permissions, or if the property is a flat, listed building, or in certain designated areas. Always check with your local planning authority and consider obtaining a Lawful Development Certificate for certainty. Planning fees in England: householder application £258 (from April 2024).
Permitted Development — Key Size Limits for Houses in England
| Project | Permitted Development if... | Planning needed if... |
|---|---|---|
| Single-storey rear extension | Max 4m (detached) or 3m (other) beyond original rear wall; max 4m height; no more than half garden covered | Exceeds these limits; prior approval needed 4–8m (detached) or 3–6m (other) |
| Two-storey rear extension | Rare — generally needs planning if within 7m of rear boundary | Almost always needs permission |
| Loft conversion | Max 40m3 additional volume (terraced) or 50m3 (other); no raised platforms or balconies; no change to roof slope on principal elevation | Exceeds volume; affects roof slope visible from road |
| Outbuilding | Not in front garden; max 4m (dual pitch) or 2.5m eaves; not used for sleeping if within 2m of boundary | On designated land or larger than half garden |
| Porch | Ground area not more than 3m2; max 3m high; not within 2m of boundary with highway | Exceeds limits |
| Solar panels (roof) | Protrudes max 0.2m; lowest part not lower than 1m from eave; not on listed building | Listed buildings; on flat roofs visible from highway |
The Lawful Development Certificate (LDC)
Even when you believe works are permitted development, it is strongly advisable to obtain a Lawful Development Certificate (LDC) before starting. An LDC from the local planning authority confirms that the development is lawful. Benefits:
- Provides certainty — protects you if neighbours complain or PDR status is later disputed
- Needed by mortgage lenders and solicitors when you sell the property
- Avoids the risk of an enforcement notice requiring demolition
- Cost: £129 for householder LDC (half the full application fee)
Planning Appeals — Your Rights
If your planning application is refused, you can appeal to the Planning Inspectorate within 6 months (for householder appeals). The appeal is free. Most householder appeals use the written representations procedure — you and the council submit written statements and the inspector makes a decision. Success rates for householder appeals are around 30–35%. If the inspector dismisses your appeal, you can apply for costs if the council behaved unreasonably.
Frequently Asked Questions
No. Neighbour objections are a material consideration but they do not determine the outcome. The council must decide the application on planning merits — the main considerations are: impact on the character of the area; loss of light to neighbours; loss of privacy; and highway considerations. Personal objections (not wanting the development) carry less weight than material planning objections. Even universal neighbourhood opposition does not mean the council must refuse.
The local planning authority can issue an enforcement notice requiring you to remove or alter the work within a specified period. Failing to comply is a criminal offence. However, councils have discretion whether to enforce and must take action within the enforcement time limit (4 years for operational development like buildings). If 4 years have passed without enforcement action, you can apply for a Lawful Development Certificate for an existing use (CLEUD) to regularise the position. Act quickly to seek retrospective planning permission if you built without permission.