Yes, you can absolutely lay a brick patio on sand without mortar — this technique is known as dry-laying or flexible paving, and it's one of the most popular DIY paving methods in New Zealand. It's forgiving, relatively affordable, and allows individual bricks to be lifted and relaid if the ground shifts or you need to access services underneath.
What Is Dry-Laid (Sand-Set) Paving?
Dry-laid paving means bricks or pavers are bedded into a layer of compacted sand rather than being set in mortar on a concrete slab. The bricks lock together through their own weight, tight jointing, and solid edge restraints. When done correctly, a sand-set patio can last for many years and handle typical residential foot traffic with ease.
This method suits NZ conditions well — our varied climate means ground movement from moisture and temperature changes is common, and a flexible paved surface can accommodate minor movement without cracking the way a rigid mortar bed might.
What You'll Need
- Bricks or concrete pavers — purpose-made pavers (at least 50 mm thick) are more durable than standard house bricks for paving
- Compactable base material — AP20 (all-passing 20 mm crushed aggregate) or similar, available from most NZ landscape suppliers
- Coarse bedding sand — washed coarse sand (not fine beach sand), typically 5–7 mm particle size
- Solid edge restraints — timber, steel edging, or concrete haunching to hold the perimeter
- Plate compactor — hire one from Bunnings or Mitre 10 if you don't own one
- Screed rails and a straight-edge — for levelling the sand bed
- String lines and a spirit level
- Rubber mallet and bricklayer's bolster
- Kiln-dried jointing sand — for filling gaps between pavers once laid
Step-by-Step: How to Lay a Brick Patio on Sand
1. Plan and Mark Out
Mark your patio area with string lines and pegs. Allow for a fall (slope) of at least 1:100 (1 cm drop per metre) away from your house or any structures to ensure good drainage — this aligns with the drainage intent of the NZ Building Code clause E1 regarding surface water management.
2. Excavate
Dig down to allow for:
- 100–150 mm of compacted base aggregate
- 30–50 mm of bedding sand
- The full thickness of your brick or paver (typically 50–65 mm)
Total excavation depth is usually around 200–250 mm below finished surface level. Remove all topsoil and organic material.
3. Lay and Compact the Base
Spread your AP20 aggregate in layers no deeper than 100 mm and compact each layer thoroughly with a plate compactor. A solid, well-compacted base is the single most important factor in a long-lasting patio — skimping here leads to sinking and unevenness later.
4. Install Edge Restraints
Fix your edging before laying sand. Without solid restraints, the paved area will spread and bricks will shift over time. Timber sleepers, steel landscape edging, or a concrete haunch all work well.
5. Screed the Bedding Sand
Spread coarse bedding sand to a depth of 30–50 mm and screed it level using rails and a straight-edge. Do not compact the sand at this stage — it needs to remain loose so the pavers can bed in evenly. Maintain your drainage fall throughout.
6. Lay the Bricks
Start from a straight edge or corner and work outward. Lay bricks in your chosen pattern — running bond, herringbone, and basketweave are all common and stable choices. Use a rubber mallet to tap each brick level. Check frequently with a spirit level and string line.
Leave a 2–3 mm joint gap between pavers for jointing sand.
7. Compact and Joint
Once all bricks are laid, run the plate compactor over the surface (place a rubber mat or old carpet under the plate to protect the brick faces). This beds the pavers firmly into the sand.
Sweep kiln-dried jointing sand across the surface, working it into the joints. Compact again, then repeat until joints are full. This locks the pavers together.
Does a Sand-Set Patio Need a Building Consent?
For most residential patios at ground level, a building consent is not required under Schedule 1 of the Building Act 2004 — but this depends on size, proximity to boundaries, and your specific council's rules. Always check with your local council before starting, as exemptions vary. You can find general guidance at MBIE Building Performance.
Tips for NZ Conditions
- Weed control: Lay a geotextile fabric over the compacted base before your sand to suppress weeds without blocking drainage.
- Frost: In colder South Island or high-altitude areas, use pavers rated for freeze-thaw conditions.
- Clay soils: NZ has many areas with expansive clay soils. If your subsoil is heavy clay, increase your base depth and consider a drainage layer — seek advice from a local landscaper or bricklayer.
- Moss and algae: Shaded patios in wetter NZ regions can become slippery. Choose a textured paver surface and treat periodically with an appropriate paving cleaner.
When to Call a Professional
Dry-laying a small patio is well within reach of a capable DIYer, but consider hiring a qualified bricklayer or paving contractor if:
- Your area is large (over 20–30 m²) or has complex shapes and cuts
- The ground is significantly sloped, unstable, or has poor drainage
- You're paving near the house foundation or over underground services
- You want a mortared finish or a patio on a concrete slab (which is more technically demanding)
- You're unsure about drainage requirements near your home
A professional bricklayer will have the tools, experience, and knowledge of local soil conditions to get the job done right first time. You can find qualified local bricklayers and paving contractors on tradedirectory.co.nz.
Licensed Building Practitioner (LBP)
