Do You Need Planning Permission for Decking

Do You Need Planning Permission for Decking?

Decking is one of the most popular ways to improve a garden in the UK, offering a practical and attractive space for seating, dining or entertaining. It can transform uneven ground into a usable surface and provide a stylish alternative to patios. Before you begin laying decking, it is important to understand whether planning permission is required. The answer depends on how high the decking is, where it is placed and whether it falls within permitted development rules.

What Counts as Decking?

Decking is considered a raised platform when assessed under planning law. It can be built from timber, composite boards or other materials, and may be freestanding or attached directly to the house. While small ground-level decks are usually straightforward, raised platforms are treated differently and may require planning permission if they exceed certain limits.

Permitted Development Rights

In most cases, decking can be installed without planning permission under permitted development rights, provided it complies with specific restrictions. The key limit is height. Decking must not be higher than 30 centimetres above ground level. If the decking is raised higher than this, it will need formal planning consent.

Decking, when combined with other outbuildings or extensions, must not cover more than half of the garden area around the original house. It also cannot be built forward of the principal elevation if that faces a road. These conditions ensure that decking remains a minor addition rather than a significant change to the property.

When Planning Permission Is Required

Planning permission is required if the decking exceeds 30 centimetres in height, if it significantly alters the ground levels, or if it is built in a conservation area, national park, Area of Outstanding Natural Beauty or on a listed property. In these cases, even modest decking projects may need approval to preserve the character of the area.

Permission is also necessary if the decking forms part of a larger raised structure such as a balcony or terrace, as these are treated differently in planning terms. Flats and maisonettes do not usually benefit from permitted development rights, meaning any external decking will normally require consent.

Building Regulations for Decking

Most domestic decking does not require building regulations approval if it is small in scale. However, raised decking must be designed and constructed safely, particularly where it is more than 30 centimetres high. Guardrails or balustrades are recommended for safety where decking is raised above ground. If the decking is attached to the house, it must not compromise ventilation or damp proofing. Electrical installations for lighting or outdoor sockets must always comply with Part P of the Building Regulations.

Costs and Practical Considerations

The cost of decking depends on the material and size. Basic softwood timber decking can cost from £70 to £100 per square metre including installation, while hardwood or composite decking can range from £120 to £200 per square metre. Costs increase if groundworks, raised supports or balustrades are required. Planning application fees, if needed, are usually around £200 in England, plus design and survey costs.

Practical issues include ensuring the ground is prepared properly, using treated materials to resist rot, and considering maintenance requirements. Timber decking requires regular staining or sealing, while composite decking is more durable and lower maintenance but usually more expensive. Drainage must also be considered to prevent pooling water beneath the deck.

Local Authority Guidance

Because decking can vary in scale and appearance, it is always wise to check with your local planning authority if you are unsure whether permission is needed. Councils may impose additional restrictions in sensitive areas, and applying for a lawful development certificate can provide written confirmation that your decking is compliant with planning rules.

Summary

In most cases, decking does not require planning permission if it is less than 30 centimetres high and does not cover more than half of the garden. Permission is needed for raised platforms, larger projects or for properties in protected areas. Building regulations generally do not apply to standard garden decking, but safety, drainage and proper construction should always be priorities. Checking with your local authority before starting ensures your decking project is legal, safe and long-lasting.