This is general guidance based on standard permitted development rights in England. Rules differ for listed buildings, conservation areas, and properties with Article 4 directions. Always confirm with your local planning authority before starting work.
Do I Need Planning Permission for a Retaining Wall?
A wall built to hold back earth and manage changes in ground level. Small retaining walls may be permitted development, but larger walls that significantly alter ground levels are likely to need planning permission.
The General Position
Whether you need planning permission depends on the specific details of your project, your property type, and your location. Check the conditions below carefully.
Whether a retaining wall needs planning permission depends on its size and the extent of ground-level change. Small retaining walls (under 1m height of retained earth) are generally treated as engineering operations within the curtilage and may be PD. Larger retaining walls that significantly alter ground levels are likely to require a planning application.
Conditions and Requirements
- 1Small retaining walls may be PD as engineering operations within the curtilage
- 2The height of a retaining wall is measured from the lower ground level, not the higher
- 3If the retaining wall also acts as a boundary wall, the combined height limit of 2m (or 1m near a highway) applies
- 4Must not cause drainage issues for neighbouring properties
Size and Dimension Limits
- No specific PD height for retaining walls; LPA interpretation varies
- If acting as a boundary: 2m maximum (1m adjacent to highway)
When Permitted Development Does Not Apply
- Significant changes to ground levels usually require planning permission
- Party wall agreements may apply if near a boundary
- Structural design is critical; poorly designed retaining walls can fail dangerously
- Drainage behind the wall (weep holes or land drains) is essential
What About Building Regulations?
Building Regulations do not formally apply to garden retaining walls. However, structural engineering design is strongly recommended for walls retaining more than 600mm of earth. Failure of a retaining wall can cause injury or property damage, and the homeowner is liable.
Building regulations are separate from planning permission. You may need both, one, or neither depending on your project. Building regulations cover the safety and quality of building work, including structural integrity, fire safety, insulation, ventilation, and drainage.
How to Apply for Planning Permission
Check if you need permission
Review the permitted development rules above. If in doubt, contact your council or apply for a Lawful Development Certificate.
Prepare your application
You will need scaled drawings, a site plan, and a completed application form. An architect or planning consultant can help with this.
Submit to your local council
Applications can be submitted online via the Planning Portal or directly to your council. Select your council below for a direct link.
Wait for a decision
8 weeks for householder planning applications if PP is needed..
Application cost: £258.
What Happens If I Build Without Permission?
Moderate risk for large retaining walls that significantly alter ground levels. Enforcement can require removal or alteration of the wall. Failed retaining walls that cause damage to neighbouring properties create civil liability for the homeowner.
Find a Builder for Your Retaining Wall
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Select Your Council
Choose your local council for guidance specific to your area, including links to apply and whether your council has conservation areas or Article 4 directions that could affect your project.
London
South East
South West
East of England
East Midlands
West Midlands
North East
North West
Yorkshire and the Humber
CA = has conservation areas. A4 = has Article 4 directions. These may restrict your permitted development rights.