How do roots actually damage block paving?
Roots grow where they find water, air and loose material, and the bedding and sub-base under paving can offer all three. As a root thickens, it pushes the bedding and blocks upwards, creating a ridge or a hump. Blocks tilt, joints open and edges lift, which creates trip hazards and lets more water in.
Roots can also cause sinking. When a large root dies or a tree is removed, the wood decays slowly and leaves a void the base can fall into. A paved area that bulges in one place and dips beside it is often showing both effects. The guide to why paving sinks explains how roots fit among the other causes.
Option 1: Can the paving simply be relaid over the root?
Sometimes. If the root is small, shallow and not essential to the tree, the blocks can be lifted, the bedding adjusted, and the paving relaid with a gentle rise that follows the root. This keeps the tree intact and makes the surface safe again without dramatic changes.
The limitation is that the root keeps growing. Relaying over it buys time rather than solving the conflict, and the area may need attention again later. It is a reasonable option for a mature tree you want to keep where the root is growing slowly, and the tree root damage repair usually starts by assessing whether this route is realistic.
Option 2: Does a root barrier help?
A root barrier is a vertical sheet installed in the ground between the tree and the paving, intended to redirect roots downwards or away. It can be worth considering when a young tree is close to a new or repaired paved area, or when a repair opens up a trench along the edge of the paving anyway.
It is not a fix for roots already under the paving, and whether a barrier suits a particular tree is a question for someone qualified in trees rather than for a paving contractor. Where it makes sense, it can be installed as part of the repair while the ground is open.
Option 3: Should the paving change near the tree?
Often the most durable solution is to stop asking the paving to sit right up against the trunk. Leaving a wider planted or gravelled area around the tree, moving the edge of the terrace back, or changing the route of a path gives the roots space and removes the conflict.
- widen the planting bed around the trunk
- end the paving with a firm edge course at a sensible distance
- use gravel or a permeable surface next to the tree
- reroute a garden path away from the root zone
On a driveway this may not be possible, but on terraces and garden paths it frequently is. Our sister site covers garden paths and permeable paving for anyone redesigning the area. Redesigning the edge near a tree is often a one-off change that ends a cycle of repeated repairs over the same root.
Option 4: Is removing the root or tree ever the answer?
Sometimes, but it is not a decision to take lightly. Cutting a major root can destabilise a tree or damage its health, and removing a tree can have consequences for the garden, for neighbours and, in some places, for local rules. Before any significant root is cut or a tree is felled, ask the town hall whether permission is needed and get the view of a qualified tree specialist.
If a tree is removed, the remaining roots decay over time and the ground above them can settle. Repairing the paving straight after removal may therefore mean a second repair later, once the decay has progressed. We explain this risk when it applies.
Who suits which option?
| Situation | Option that often fits |
|---|---|
| Mature tree you want to keep, small root | Relay over the root with an adjusted base |
| Young tree close to new paving | Root barrier with qualified advice |
| Terrace or path hard against a trunk | Change the paving layout near the tree |
| Tree already being removed for other reasons | Repair after removal, allowing for later settlement |
| Driveway with roots in the wheel lines | Relay plus a firm edge; consider the tree's future |
These are starting points; the right choice depends on the tree, the distance, the use of the paving and your own priorities. We give our view on the paving side and recommend tree advice where the tree itself is the question.
What mistakes should you avoid with root damage?
The most common mistake is to grind down the raised blocks or pack extra material around the hump to hide it. That leaves the root growing beneath, and the problem returns, often with broken blocks. Another is to cut a large root without advice and then discover the tree has been harmed or has become unstable.
- do not cut significant roots without advice from a tree specialist
- do not grind or chip blocks to level a hump
- do not ignore a dip beside a hump, as it may be a decaying root
- do not lay new paving tight against a young tree's trunk
Avoiding these keeps your options open and usually makes the eventual repair simpler and longer-lasting. If you are unsure whether something you have already done has made matters worse, mention it when you send photos; it changes nothing about our advice except to make it more accurate.
What does a root repair involve on site?
We lift the blocks over and around the affected area with a margin, expose the root carefully by hand, and photograph it so you can see its size and position. If you are away, those photos are the basis for deciding together which option to take. Nothing is cut without your agreement.
Once the route is agreed, the base is rebuilt as needed, the bedding adjusted and the blocks relaid, jointed and compacted. Where the root has also caused a dip next to the hump, that area is corrected in the same job through our lift and relay service.
How should you start?
Send photos of the lifted area, the tree and the distance between them, plus a wide shot of the whole surface. Let us know roughly how old the tree is, whether you want to keep it, and whether it is yours, a neighbour's or the community's. Send us a photo and the approximate m² – free, no-obligation quote. If the cause turns out to be something other than roots, our subsidence diagnosis will identify it before any work is priced.
Frequently asked questions
Can tree roots lift a block paved driveway?
Yes. As roots grow in the bedding and sub-base, they push blocks upwards, causing humps, tilted blocks and open joints. Driveways near large trees are particularly affected where roots run under the wheel lines.
Can paving be relaid without cutting the root?
Often, if the root is relatively small and shallow. The blocks are lifted, the bedding adjusted and the paving relaid with a gentle rise over the root. The root will keep growing, so the area may need attention again in future.
Do root barriers stop roots lifting paving?
They can redirect future root growth away from paving, mainly with young trees or when a trench is open anyway. They do not deal with roots already under the paving. Whether a barrier suits a given tree is a question for a tree specialist.
Is it safe to cut a large root under my paving?
It may not be. Cutting a major root can damage the tree or make it unstable. Before cutting anything significant, get advice from a qualified tree specialist and check local rules with the town hall. We do not cut roots without your agreement.
Why has my paving sunk where a tree used to be?
When a tree is removed or a large root dies, the wood decays and leaves voids. The base above gradually falls into them, creating a dip. Repairs soon after removal may need revisiting once decay has progressed further.
Can I just remove the tree to protect the paving?
It is one option, but it has consequences for the garden and sometimes for local rules. Before felling, ask the town hall whether any permission applies to that tree. Remaining roots will also decay and can cause later settlement.
What if the tree belongs to my neighbour or the community?
Then the decision involves them. For a community, works affecting common elements go through the owners' meeting. Photos of the root and paving help everyone understand the situation before options are discussed.
Is changing the paving layout around a tree worth it?
On terraces and garden paths, often yes. Leaving more space round the trunk, moving the edge back or using gravel near the tree removes the conflict and tends to last longer than repeatedly relaying over a growing root.
Do you assess the health of the tree?
No. We assess the paving side: the base, the root's position relative to the blocks and the repair options. Questions about the tree's health, stability or felling are for a qualified tree specialist.
What photos should I send for root damage?
A close-up of the lifted area, a photo showing the tree and its distance from the paving, a wide shot of the whole surface, and any dips beside the hump. Tell us whether you want to keep the tree and who owns it.