How to Build Paver Edging: Step-by-Step for DIYers

Paver edging is one of the details that makes a garden look finished. It is both a structural and a visual boundary, separating the soft parts of the garden (plants, mulch and soil) from the lawn or hard landscaping. A well-laid edge also does a practical job: it slows grass creeping into your borders and helps stop mulch washing onto the lawn in heavy rain.

For a keen DIYer, lawn edging in block paving is a rewarding weekend project. It takes physical effort and care, but no heavy machinery. If you prepare the ground methodically, set the levels carefully and finish the joints properly, you can get a result that looks like a professional job. This guide takes you through each stage.

Before you start: safety

Even a shallow trench can hit something you did not expect, so take a few precautions before the spade goes in:

• Find buried services first. Irrigation pipes and garden lighting cables are often only just below the surface. In the UK, check any plans you have for the property, look for inspection covers and outdoor sockets, and consider hiring a cable avoidance tool. In the US, call 811 before you dig so underground lines can be marked.
• Control silica dust. Cutting concrete or stone blocks produces hazardous silica dust. Cut wet wherever possible, and wear eye and ear protection and a suitable respirator; a basic dust mask is not enough.
• Protect your hands and back. Wear sturdy gloves for handling blocks and stone, and lift with bent knees, moving heavy bags and blocks in a wheelbarrow rather than carrying them.

1. Planning

A good edge starts before you dig. First decide on the line: a crisp, straight border or a flowing curve. Lay a garden hose or a long rope on the ground to try out the shape, and look at it from the house and from different parts of the garden. This lets you check that the edge flows well and suits the house and any existing paths.

Once you are happy with the shape, measure its length in metres so you can work out how many blocks you need. You will also need to allow for the width of the blocks and the depth of the base materials. Order a few extra blocks for cuts and breakages. This is also the moment to check where any irrigation pipes or lighting cables run, as described above.

2. Materials

Good materials make for a longer-lasting edge. For a typical paver edging, you will need:

• Paving blocks: choose blocks that match or contrast with your existing paths. Popular choices include tumbled concrete blocks, natural cobbles and clay bricks.
• Crushed stone for the base: a well-graded crushed stone that compacts firmly, often sold as MOT Type 1 in the UK (crusher run or ¾-minus in the US). It gives the edge a stable, free-draining foundation.
• Bedding sand: a thin layer of sharp sand lets you make small adjustments when you set each block.
• Landscape fabric: a heavy-duty geotextile that stops the base being pushed down into the soil beneath.
• Jointing sand: kiln-dried sand or polymeric sand, which contains binders that help lock the blocks together and discourage weeds in the joints.
• Tools: a spade and half-moon edging iron, pegs and string line, a spirit level, a rubber mallet, a hand tamper (or a hired plate compactor) and a small straight board for screeding.

3. Layout

Now transfer your design to the ground. For straight lines, knock a wooden peg in at each end and pull a string line tight between them. The line guides both the alignment and the finished height of the blocks. For curves, follow the hose you laid out at the planning stage with line-marking paint.

Accuracy here prevents wobbles later. If you are edging alongside a path, keep the edging parallel to it. For a ring around a tree, drive a peg in at the centre and use a string tied to it to mark an even circle. If the painted line looks wrong now, the finished border will look wrong too, so adjust it until you are happy.

4. Excavation

Digging the trench is the hardest physical work. Make it a little wider than the blocks so there is room for a stable base on either side. Cut the turf with a half-moon edging iron or a sharp spade, keeping the sides of the trench vertical, and stack the lifted turf to one side in case you can reuse it.

The depth is the base, plus the sand, plus the height of the block, minus however much of the block you want to show. The base is commonly around 50–75 mm (2–3 in) of compacted crushed stone with about 25 mm (1 in) of sand under each block; go deeper on clay or where people walk along the edge. If you want a mowing edge that the mower wheels can run over, dig deep enough that the top of the block sits level with the lawn or just a little above it. For a raised, kerb-like look, the trench can be shallower. Keep the bottom of the trench as level as you can, and remove any large stones or roots that could make the base shift later.

5. Base

An edge is only as stable as the ground beneath it. Blocks set straight onto soil tend to sink, shift or tilt, particularly where the ground gets waterlogged or goes through freeze–thaw cycles. Start by lining the trench with landscape fabric to keep the stone and soil separate.

Fill the trench with crushed stone in thin layers and compact each one firmly with a hand tamper or a plate compactor until it no longer moves underfoot. Do not skip the compaction: it creates a firm, even bed that carries the weight of the blocks and lets water drain away, which reduces the risk of frost lifting them.

6. Sanding

Spread the layer of bedding sand over the compacted base. This is the cushion the blocks are seated into. Rather than compacting the sand, draw a small straight board or a trowel along it to screed it level.

The sand lets you take up very small irregularities in the base, but it cannot fix a badly levelled one, so get the stone right first. Keep off the screeded sand; footprints leave dips that turn into uneven blocks.

7. Placement

Starting at one end, set the first block onto the sand and tap it down with a rubber mallet until it reaches the height of your string line. Check it with a spirit level along its length and across its width.

Butt the next block tightly against the first. Tight joints are what give the edging its strength. Carry on along the run, checking against your string or painted line as you go. If a block sits too low, lift it, add a little sand and reset it; if it sits too high, tap it down more firmly.

8. Cutting

Sooner or later a full block will not fit, perhaps at the end of a run or where the edging meets a driveway or path. Mark the cut with a pencil or a wax crayon.

For a rustic look, concrete blocks can be split with a bolster chisel and a club hammer. For a crisp, clean cut, use a wet masonry saw or an angle grinder with a diamond blade and water suppression, following the tool's safety instructions. As noted above, wear eye and ear protection, a suitable respirator and gloves whenever you cut, and keep other people and pets well away.

On tight curves, rectangular blocks leave small wedge-shaped gaps on the outside of the bend. You can fill these with jointing sand, or cut the ends of the blocks at an angle so they meet more closely.

9. Restraints

Even on a good base, blocks can creep or lean outwards over time, pushed by the soil or by mowers running along them. To stop this, fit an edge restraint along the outer side of the blocks, usually the side facing the lawn. Another common approach is to haunch the outer side with a sloping bead of concrete; ask your supplier which suits your blocks.

Purpose-made restraints are usually L-shaped strips of heavy-duty plastic or aluminium that sit tight against the base of the blocks. Fix them with the spikes and at the spacing specified by the edging manufacturer. Once the soil and turf are back in place, the restraint is hidden, but it holds the blocks in a tight line.

10. Filling the joints

Next, fill the joints. Ordinary kiln-dried sand works, but many DIYers prefer polymeric sand, which contains binders that harden when wetted and help hold the joint together.

Check the weather first: polymeric sand usually needs a dry window before and after it is laid, and the bag will say how long. Sweep the sand across the blocks and into every joint, filling to just below the top as the product instructions direct. Then clean every trace of loose sand off the surface with a soft brush or a leaf blower on its lowest setting. This matters: any sand left on top can harden there and leave a stubborn haze.

11. Activation

With the joints full and the faces of the blocks clean, wet the edging with a hose on a gentle mist or shower setting. A strong jet will wash the sand out of the joints. The aim is to dampen the sand so the binder activates.

Follow the instructions on the bag exactly; many products call for several light mistings. As it dries and cures, the sand firms up, which helps discourage ants and weeds in the joints.

12. Finishing

Finally, backfill around the edge. On the border side, bring soil or mulch up to the level of the blocks. On the lawn side, fill the gap left by the trench with topsoil, then sow grass seed or relay strips of the turf you lifted earlier.

Firm the soil down well so there are no air pockets, then water it thoroughly to help it settle. Your paver edging is now finished, giving you a clean, mowable edge that defines your garden.

Tip: Before you set the blocks, push your mower along the string line once. Seeing exactly where the wheels and blade run tells you whether a flush mowing edge or a slightly raised one will save you the most trimming.

FAQ

How deep should I dig for paver edging?

Add together the base, the sand and the height of the block, then subtract the amount of block you want to show above the soil. The base is commonly around 50–75 mm (2–3 in) of compacted crushed stone with about 25 mm (1 in) of sand, and deeper on clay or along an edge people walk on.

Can I skip the crushed stone and just use sand?

It is not recommended. Sand on its own is prone to shifting and washing out, so blocks can sink or tilt. A compacted stone base gives the drainage and stability that keep the edge level through the seasons.

Do I need to use polymeric sand?

No, but many people prefer it. It firms up to help hold the blocks and discourages weeds and ants in the joints. Kiln-dried sand is simpler to use but may need topping up more often.

How do I handle tight curves with rectangular blocks?

You will get small wedge-shaped gaps on the outside of the curve. Either fill them with jointing sand or cut the block ends at an angle with a wet saw, wearing the protective equipment described above, so they meet more neatly.

How long will a DIY paver edge last?

It depends on the blocks you choose, how well the base and restraints are installed, and your climate. A properly compacted base and firm restraints make the biggest difference, and the joints may need topping up from time to time.

Final thoughts

Paver edging rewards patience: the time you spend on the line, the trench and the compacted base is what keeps the blocks straight for years. If you are still deciding which kind of border suits your garden, read landscape edging pros and cons, and if you are planning a bigger block-paving project, see how to build a paver driveway. For help designing a garden or terrace where the edges, paths and planting work together, explore our balcony and terrace decoration service or book a consultation.