Patios & paving · Practical advice
What is under a properly built patio?
Take a look beneath a finished patio at the ground, sub-base, bedding and jointing, and see how these elements combine with drainage to support the paving.
The finish is only one layer
A patio is a complete construction rather than a collection of slabs laid on whatever ground is present. For a conventional ground-supported installation, the prepared ground, sub-base, bedding, paving and joints each have a role. Drainage and edge details connect those layers to the rest of the garden.
Before work begins, agree the finished heights at doors, steps, covers and boundaries. Those levels determine how much room is needed for the supporting construction, rather than excavation being chosen independently of the design.
Prepared ground and sub-base
The exposed ground must be assessed for suitability. Soft patches, organic material and disturbed trenches can need different treatment from firm, consistent ground. A separation layer may be specified where conditions call for it, but it does not replace proper support.
The sub-base spreads loads and provides a stable platform. Its material, thickness and compaction should suit the ground and intended use. A patio carrying people and furniture should not automatically be treated as suitable for vehicles, heavy equipment or other substantial loads.
Bedding, bonding and joints
The bedding system supports the selected slabs and establishes the finished geometry. In a mortar-bedded patio, an appropriate bond may also be required between paving and bed. Other engineered systems use different details, so the selected product and method need to be stated clearly.
Joints finish the gaps and accommodate the requirements of that system. They cannot make unstable support sound. The chosen material must suit the joint dimensions, paving and exposure, and any movement details need separate consideration.
Ask for a construction record
Request photographs of the stages before they disappear. Record the paving product, bedding and jointing materials, drainage arrangement and any departures from the original scope. A clear record is valuable when maintaining the patio or extending it later.
At handover, ask when the area can be walked on, when furniture can return and how to clean it. Protect access to inspection covers. The best-looking slab is only part of the result: reliable support and a maintainable layout are what allow the finished space to remain useful.
Common questions
Is there one correct depth for every patio?
No. Ground conditions, selected materials and intended loads affect the design. Ask for a site-specific explanation of the proposed build-up.
Can a patio support a hot tub?
Do not assume so. The filled weight and concentrated loads need to be considered explicitly before construction or placing the tub.
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.