Quick Answer

The Drainage Rule Explained

In 2008, the government changed the permitted development rules for front gardens specifically to address urban flooding caused by widespread paving. The rules now distinguish between permeable and impermeable surfaces.

Under Class F of Schedule 2 to the GPDO 2015, the provision of a hard surface in the front garden of a dwelling is permitted development — but only if:

• The surface is permeable (allows water to pass through), OR
• The surface is impermeable but water drains to a permeable area within the curtilage (e.g., a lawn or a soakaway), rather than onto the highway

If your impermeable surface drains onto the public road or pavement, and covers more than 5m², you need planning permission.

What Surfaces Don’t Need Planning Permission

The following surfaces are permitted development for any area, because they are permeable:

• Gravel or shingle: Water passes through freely
• Permeable block paving: Blocks with gaps filled with gravel or grass
• Resin-bound gravel: If laid correctly on a permeable base
• Grass or lawn: Fully permeable
• Open-jointed paving: Slabs with gravel or planted joints

These surfaces allow rainwater to drain naturally into the ground, avoiding the runoff problem that the rules were designed to prevent.

When You Need Planning Permission

You need planning permission to pave your front garden if:

• The surface is impermeable (solid concrete, standard tarmac, non-permeable slabs), AND
• The area is more than 5 square metres, AND
• The surface drains onto the public highway rather than a permeable area within your property

In practice, most impermeable driveways need planning permission — the 5m² threshold is very small (roughly 2m x 2.5m), and most driveways slope towards the street.

Does Size Matter?

For permeable surfaces, size is irrelevant — you can cover your entire front garden in gravel without any planning permission. For impermeable surfaces that drain onto the highway, the 5m² threshold kicks in. 5m² is a very small area in practice — about the size of a small car parking space (a standard car space is roughly 4.8m x 2.4m = 11.5m²).

This means almost any impermeable driveway for a full-sized car will need planning permission if it drains onto the road.

Front Garden vs Back Garden

The drainage rules only apply to front gardens — defined as the area between the principal elevation of the house and the highway boundary. Paving a rear or side garden is covered by the general outbuilding and hardstanding rules, and there is no equivalent drainage requirement.

For back gardens: paving any area at ground level for domestic use does not require planning permission, regardless of surface type or drainage, as long as it is within the curtilage of the house and not raised significantly above ground level.

Conservation Areas and Listed Buildings

In conservation areas, some councils have removed the PD right for front garden paving — particularly where traditional front gardens form part of the character of the area. If you live in a conservation area, check with your local planning authority before paving, even with a permeable surface.

For listed buildings, any work to the grounds or setting — including paving — may require listed building consent as well as planning permission. Always check before starting work.