Patio drainage and levels
Decide where the rain will go before deciding where the paving will finish.
Every hard surface changes how water moves. Record existing ponding, slopes, thresholds, channels, downpipes and permeable garden areas so drainage can be designed with the patio instead of added after it.
01
Read the existing water route
Visit the area during or after rain if it is safe. Photograph ponding and note whether runoff moves toward the house, a neighbour, a lawn, a drain or a retaining edge.
Door, air-brick and wall levels
Existing channels and outlets
Downpipes and roof-water routes
Soil, slope and waterlogged areas
02
Falls are part of the visual design
The layout should accommodate controlled falls without awkward cuts, abrupt ramps or low points. Large formats, multiple thresholds and curved boundaries make early setting-out especially important.
03
Front gardens have specific planning rules
Government guidance says a new or replacement front-garden hard surface can remain permitted development where it is permeable or directs water to a permeable area within the property. Traditional impermeable front-garden surfacing over five square metres may require planning permission. Confirm the current position for the property and proposal with the local planning authority.
Related planning
Continue with the connected detail.
These pages cover the neighbouring material and construction decisions without repeating this page.
Patio installationPlanning a new patio in Surrey? Prepare the area, access, levels, drainage and material choices before requesting an installer estimate.Read the guide 
Raised patiosPlan a raised patio or terrace in Surrey around retained levels, steps, guarding, drainage, thresholds and the surrounding garden.Read the guide Patio repairsDescribe a failed patio in Surrey by symptoms, extent, levels and drainage before deciding between local repair and replacement.Read the guide 
Porcelain patiosCompare porcelain patio requirements in Surrey, including format, grip, cutting, falls, joints, edges and access before requesting an estimate.Read the guide Prepare the project
Describe this patio drainage enquiry.
Add the site, access, level and material details that make the first conversation useful. Photographs can be attached safely from the form.
Common questions
Before requesting an estimate.
Can patio water discharge onto the pavement or next door?
The design should not simply transfer runoff to neighbouring land or the highway. Identify a suitable route within the project and obtain any necessary drainage or planning advice.
Will a channel drain solve every threshold problem?
No. Channels need correct levels, capacity, outlets and maintenance, and the surrounding building details still matter. They are one component of a drainage design.
Is permeable paving the same as paving that slopes to a lawn?
They are different approaches. A permeable construction allows water through the paved system; an impermeable surface may instead direct runoff to a suitable permeable area. The site determines what is appropriate.
Sources and scope
UK guidance used for this page cluster.
Requirements depend on the property and proposal. Confirm planning and technical decisions with the relevant authority and competent project team.