Materials compared
| Material | Look | Upkeep | Relative cost |
|---|---|---|---|
| Porcelain | Crisp, even colour | Very low; stain-resistant | higher |
| Indian sandstone | Natural, varied | Needs sealing and cleaning | middle |
| Concrete slabs | Plain or textured | Low | lower |
Checkatrade's patio laying cost guide gives about £65 to £340 per m² in 2026. Steps, low walls, drainage and access to the back garden all affect the final figure.
The base
Slabs should be laid on a full mortar bed over a compacted sub-base. "Five-spot" laying, with a dab of mortar at each corner, leaves hollows that crack and rock. Porcelain needs a slurry primer on the back of each slab so it bonds to the mortar.
Falls and the damp course
A patio must slope gently away from the house, usually about 1 in 60 to 1 in 80, so rain does not collect against the wall. The finished surface should sit at least 150mm below the damp-proof course. This is the commonest mistake on patios built right up to back doors.
Long, narrow gardens
Many Billingham back gardens are long and fairly narrow. A patio across the full width by the house, with a path leading to a second seating area at the far end, uses the space well. If the garden faces north, a seating area at the bottom may get more sun than one by the house.
Joints
Brush-in jointing compounds are quick and neat; traditional mortar joints are hard-wearing. Either way, gaps should be consistent and filled to the top so water runs off rather than in.
Common questions
Do I need planning permission for a patio?
Usually not at the back of a house. Raised decks or platforms over 30cm high can need permission.
Is porcelain slippery?
Exterior porcelain has a textured, slip-rated surface. Choose a slab rated for outdoor use.
How long does a patio take?
A typical 20m² patio is usually a few days' work, depending on access and the amount of digging out.
Can a patio be laid over old slabs?
It is rarely a good idea. Old slabs often hide a weak base and raise the level towards the damp course.