How to Lay a Patio: A Complete Step-by-Step Guide

Learning how to lay a patio correctly is the key to a long-lasting, beautiful outdoor space. Whether you're working with natural sandstone paving or large-format porcelain slabs, this guide walks you through every stage — from ground preparation to final sealing.

What You'll Need to Lay a Patio

• Natural stone or porcelain paving slabs
• MOT Type 1 hardcore sub-base
• Sharp sand and cement (for mortar bed)
• Pointing mortar or brush-in jointing compound
• Spirit level, string line, and pegs
• Rubber mallet and bolster chisel
• Plate compactor (available to hire)
• Tape measure

Step 1: Plan Your Patio Layout

Before breaking ground, plan your patio layout carefully. Mark the area with pegs and string, and factor in a drainage gradient of 1:60 — sloping away from the house — to prevent water pooling. Sketch your slab pattern to minimise cuts and waste.

Step 2: Excavate and Prepare the Ground

Excavate to a depth of 150–200mm to accommodate the sub-base, mortar bed, and slab thickness. Remove all topsoil, roots, and vegetation. A clean, stable base is essential for preventing future movement or sinking.

Step 3: Lay and Compact the Sub-Base

Spread a 100mm layer of MOT Type 1 hardcore and compact it thoroughly with a plate compactor. This load-bearing layer is critical — skipping it is the most common cause of patio failure.

Step 4: Mix and Lay the Mortar Bed

Prepare a semi-dry mortar mix of 4 parts sharp sand to 1 part cement. Lay it at 40–50mm depth and screed level using your string line as a guide. The mortar should hold its shape when squeezed but not be wet or sloppy.

Step 5: Lay Your Paving Slabs

Place each slab onto the mortar bed and tap firmly into position with a rubber mallet. Use a spirit level to check both the individual slab and the overall fall. Maintain consistent joint gaps of 10–15mm using spacers. For large-format porcelain slabs, use a full-bed adhesive mortar rather than spot bedding.

Step 6: Point the Joints

Allow the mortar bed to cure for 24–48 hours before pointing. Fill joints with a suitable pointing mortar or brush-in jointing compound. For porcelain paving, always use a flexible, polymer-modified grout to accommodate thermal movement.

Step 7: Clean and Seal Your Patio

Remove any mortar smears with a damp cloth before they set. Once fully cured (48–72 hours), apply a penetrating stone sealant to protect natural sandstone or limestone from staining and weathering. Porcelain requires no sealing but benefits from a grout sealer on the joints.

Patio Laying Tips from the Experts

• Always wet natural stone before laying — dry slabs absorb moisture from the mortar too quickly, weakening the bond.
• Check levels constantly — don't wait until the end to discover a slope in the wrong direction.
• Allow for expansion — leave a small gap at the perimeter and against walls to allow for thermal movement.
• Work in dry conditions — avoid laying in frost or heavy rain, which can compromise the mortar cure.

How Much Paving Do I Need?

Measure your area in square metres (length × width) and add 10% for cuts and wastage. Our team can help you calculate quantities — just get in touch.

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