Patios & paving · Practical advice
Why do patios need a fall?
A patio needs a planned fall to help rainfall drain away. Explore how levels and drainage can reduce standing water while keeping the finished space practical.
An even patio can still have a fall
A drainage fall is a deliberate change in height that helps water travel to the intended destination. The paving should feel consistent underfoot while following that design. A spirit level showing dead level everywhere is not necessarily evidence of a well-drained patio.
Plan the water route before choosing the exact finished heights. Doors, steps, buildings and existing garden levels can limit the available options. Correcting this after installation is usually more disruptive than resolving it on the drawing.
Choose the fall for the material and layout
Surface texture, slab format, joint arrangement and drainage position affect how water moves. The chosen paving manufacturer's guidance and site design should inform the fall. There is no single gradient that can be copied uncritically onto every patio.
For scale, a fall of 1 in 80 means 12.5 millimetres of drop over one metre. That is an arithmetic example, not a specification for your project. The required design must also work with access needs and the surrounding building details.
Give collected water somewhere appropriate to go
A channel or gully is useful only when its outlet and capacity are suitable. A planted area may be part of a solution where conditions allow, but water should not simply be displaced towards a neighbour or a vulnerable threshold.
Keep drainage features accessible for cleaning. Discuss how the layout manages rainfall at doors and steps, and ensure the design respects damp-proofing and ventilation details. A visually flush threshold needs a considered construction detail rather than merely raising the paving.
Assess puddles by their behaviour
Notice where water remains, how large the area is and how quickly it clears. Surface texture can retain some moisture, while a persistent depression may indicate incorrect levels or settlement. Take photographs during comparable weather to make the problem easier to explain.
Check for debris in drainage channels before deciding the paving needs relaying. If the outlet is clear but water remains, have the levels and support assessed. The repair should restore the intended water route, not just move the low point to another part of the garden.
Common questions
Can I add drainage after the patio is laid?
Sometimes, but it may involve lifting paving and establishing a suitable outlet. First determine whether the problem is collection, levels, blockage or capacity.
Does every small wet patch mean failure?
No. Texture, shade and weather affect drying. Persistent ponding, worsening low spots or water reaching the building deserve closer attention.
Discuss your project
Tell us what you would like to change and share photographs of the area. We can discuss the next steps for your property.