What is lift and relay, and when is it the right repair?
Lift and relay is the process of removing a section of block paving, repairing the layers beneath it and laying the same blocks back in their original pattern. It is the right repair whenever the surface is still in usable condition but has lost support: a dip in a driveway, a hollow on a patio, a tilted run of blocks along a path or a sunken patch over an old trench.
The approach works because block paving is designed to come apart. Unlike a concrete slab or a tiled terrace on mortar, interlocking pavers sit on loose bedding and are held by sand joints and edge restraint, so they can be taken up without breaking. Once the reason for the movement has been corrected, they go back down and behave like the surrounding paving.
It is not the right repair if the blocks are badly cracked, crumbling at the arrises or so worn that they no longer interlock, or if the sub-base has failed across the entire area. In those cases a replacement is more honest. Our guide repair or replace sets out the signs that tip the balance.
How are the blocks taken up without damaging them?
The first blocks are the hardest to remove, because every paver is locked by its neighbours. We start at a natural break such as an edge, a cut piece or the lowest point of the dip, and ease out the first few with paving extractors or two flat bars. After that the rest of the section lifts by hand.
- The area is photographed and, for patterned paving, marked in sections so the layout can be reproduced.
- Blocks are stacked nearby in the order they came up, face up, away from the working area.
- Cut pieces at edges and around covers are labelled, because they are rarely interchangeable.
- Old jointing sand and bedding stuck to the blocks are scraped off before relaying.
- Any cracked or chipped units are set aside so replacements can be sourced early.
We lift slightly beyond the visible dip. The blocks on the rim of a hollow are often already tilted, and if they stay in place the repaired area ends up with a ridge around it. Taking up a margin of firm paving lets the new level blend into the old.
What happens to the base once the paving is up?
This is the stage that decides whether the repair lasts. With the blocks removed, we dig out the contaminated bedding and inspect the sub-base to find the soft spot, the void or the washed-out layer that caused the sinking, then rebuild it with compacted granular material.
Typical findings include a sub-base that is simply too thin, one laid as a single thick lift that was never compacted through its depth, clay or topsoil left beneath the stone, or a layer full of fines that turns soft when wet. Each finding changes what we do next, which is why we photograph the open excavation for you before rebuilding it.
- Remove the soft or contaminated material down to firm ground.
- Correct any water source feeding the area, such as a leaking pipe or a downpipe discharging onto the paving.
- Place granular sub-base in thin layers and compact each one with a plate compactor.
- Bring the top of the sub-base to a level that leaves room for the bedding and the blocks.
- Check the falls with a string line or straight edge so water runs away from buildings.
The common faults found at this stage are described in base failures that cause sinking. If the opening reveals a manhole or service trench as the cause, the approach in manholes and trenches applies. In both cases we explain the finding to you before the base is closed up again, so nothing is decided without your knowledge.
How is the bedding layer laid and screeded?
The bedding is a thin, even layer of grit that the blocks sit on. It is spread loose over the compacted sub-base and then screeded with rails and a straight edge so that its surface follows the finished level and fall, minus the thickness of the pavers.
The bedding is never used to make up height. If the sub-base is low, we correct the sub-base; filling a hollow with extra bedding just creates a thick, soft zone that compresses under load and reproduces the original dip. Once screeded, the bed is not walked on, and the blocks are laid working forward from the paving already in place.
How are the pavers relaid, jointed and compacted?
The cleaned blocks go back in the original pattern, butted against their neighbours with the correct joint gap. Laying is done from the existing firm paving outwards, so the courses line up with the surrounding surface and no visible step forms where old meets new.
- Pattern and bond are checked against the photos taken before lifting.
- Replacement blocks, if needed, go in less prominent positions and sound originals move to the visible area.
- Cuts at edges and around covers are made cleanly so no small slivers are left loose.
- Dry jointing sand is brushed into the joints before and after compaction.
- A plate compactor, ideally with a protective pad, beds the blocks into the grit and locks them together.
Compaction is what turns loose blocks into a pavement again. It pushes the pavers into the bedding, drives sand up into the joints and creates the friction that spreads load from one block to the next. Joints usually settle slightly afterwards, so they are topped up once more before we leave and should be checked again after the first rain.
Can lift and relay also be used on slabs and other surfaces?
The same principle applies to natural stone setts, clay pavers and slabs laid on a flexible bed of grit or sand. They can be lifted, the support corrected and the units relaid. The difference lies in handling: large slabs are heavier and more fragile, and some stone is more prone to chipping during extraction.
Tiles or slabs bonded with mortar onto a concrete base are a different case. When tiles lift on a terrace, the cause is usually loss of bond or movement in the slab, and the repair is not a lift and relay in the paving sense. We look at photos first and tell you whether the job is something we handle or belongs with a tiling contractor.
What should the quote for a lift and relay include?
A clear quote names the area to be lifted, the depth of base correction expected, how unexpected findings will be handled, and whether jointing sand, replacement blocks and removal of spoil are included. Without those points, two quotes for the same dip cannot really be compared.
We describe our scope in writing and say in advance what we will do if the opened base turns out worse than expected. Indicative figures for repair work are kept on the price site, on the page for sunken paving repair costs. The article warning signs in a paving repair quote lists the omissions worth asking about.
If the paving is generally sound but one particular area keeps moving, a dedicated repair may be narrower than a full lift and relay. For dips spread across a patio, see re-levelling uneven paving; for blocks that rock without having sunk much, see loose and rocking pavers. Send us a photo and the approximate m² – free, no-obligation quote.
Frequently asked questions
Will my original pavers be reused?
Yes, whenever they are sound. Lifting is done by hand and the blocks are cleaned and relaid in their original pattern. Only units that are cracked, chipped badly or missing are replaced, ideally with the closest matching block available.
How much paving around the dip needs to be lifted?
A little more than the visible hollow. Blocks on the rim of a dip are usually tilted already, so we take up a margin of firm paving around it. That allows the new level to blend smoothly into the old surface without a ridge.
Why is the base rebuilt rather than just adding more sand?
Extra sand under the blocks creates a thick, soft bedding that compresses under feet and tyres, so the dip reappears. A lasting repair corrects the sub-base itself with granular material compacted in layers, leaving only a thin, even bedding layer.
Can lift and relay fix paving that slopes towards the house?
Yes. Because the base is rebuilt, the falls can be corrected at the same time so surface water runs away from walls and thresholds. Where the levels around the house make that difficult, a channel drain may be added along the building.
What jointing material is used after relaying?
We use dry jointing sand brushed into the joints and compacted in with the blocks. It allows the pavement to flex and lets some water through. Joints are topped up after compaction and should be checked again after the first rain.
Is a plate compactor safe for my pavers?
Yes, when used correctly. We run the compactor over the relaid surface with jointing sand in place and, where the blocks have a delicate finish, with a protective pad. This beds the blocks evenly without scuffing their faces.
Can I drive on the driveway straight after the repair?
Once the blocks are relaid, jointed and compacted, the surface is a working pavement again. We still recommend avoiding sharp turns on the spot at first and topping up the joints after the first rain, as the sand settles slightly.
Can lift and relay be done on stone setts or clay pavers?
Yes, provided they were laid on a flexible bed of grit or sand. The process is the same: lift, correct the base, re-bed and relay. Natural stone needs careful handling during extraction because some types chip more easily than concrete blocks.
What if the base under my paving is concrete?
Some driveways have pavers over a concrete base. If the concrete itself has cracked or settled, it must be assessed separately. We look at it once the blocks are up and explain whether it can stay, needs local repair or should be replaced.
Will the repaired section look different from the rest?
Pattern and size match because the same blocks go back. The lifted blocks may look cleaner at first, since dirt has been scraped off, so a slight colour difference can show until weathering evens it out over time.