Last Updated on October 20, 2026 by Umar Farooq
Uneven sidewalk pavers are fixable, and usually without replacing the whole walk. Start by measuring the step between neighbouring pavers. ICPI's limit for lippage on pedestrian routes is 1/8 inch, and an accessible route allows up to 1/4 inch before it needs treatment. If a paver is higher or lower than that, lift just the affected section, rebuild the base and bedding sand underneath, and relay the same pavers. The step is a symptom; what moved under it is the actual problem.
Measure the step before you decide it is a problem
Plenty of "uneven" sidewalks are within spec and just look wavy in low sun. Lay a straightedge or a long level across the suspect area, then slide a ruler under it at the worst point. Two numbers matter.
ICPI Tech Spec 2 sets a maximum lippage of 1/8 inch between pavers on pedestrian routes. For a public or accessible route, the US Access Board's guide says changes in level can be up to 1/4 inch without treatment, or 1/2 inch if beveled with a slope no steeper than 1:2, and anything above 1/2 inch must be treated as a ramp. That is the yardstick for a trip hazard, and it is a good one to hold a repair crew to.
Under 1/8 inch, leave it alone. Between 1/8 and 1/4 inch, it is worth fixing on a path people walk daily. Above 1/4 inch, treat it as urgent.
Raised, sunken or tilted: read the pattern first
The shape of the problem points at the cause, and the cause decides the repair.
| What you see | Likely cause | What to check |
|---|---|---|
| A dip in a patch, often with open joints | Base or bedding sand settled, or sand washed out | Water running onto the spot, a downspout, a missed compaction lift |
| A raised bump that gets worse each year | Something is growing or swelling under the paver | Tree roots, frost, a leaking line |
| Edge pavers lower or tilted outward | The restraint has failed and the field is spreading | Missing spikes, no edging, soil eroded at the side |
| One paver high or low against neighbours | Loose bedding under a single unit | The joint around it, and whether it rocks |
| A long, shallow slope | The subgrade moved across a wide area | Drainage and soil, not the pavers |
I would not reach for a fix until a column has been ticked. Relaying a paver over the same cause just schedules the same repair for next year.
Lift the bad section and relay the same pavers
This is where pavers beat a poured slab. A cracked slab is cut out or ground down; a paver walk can be lifted, repaired underneath and put back. Our guide to how to fix sunken pavers walks through the full method. In short:
- Mark the affected area plus a row of good pavers around it, and lift them with a paver puller or screwdrivers, stacking them in order.
- Dig down to see what failed. If the bedding sand is deeper than the 1 inch ICPI and CMHA call for, that is a dip waiting to happen.
- Fix the base first. Add stone in thin lifts and compact it until it is flat within 3/8 inch over a 10 foot straightedge (CMHA PAV-GSP-011-21). The sand never fixes a lumpy base.
- Screed a fresh 1 inch of sand, relay the pavers, sweep in joint sand and compact.
A single broken or cracked unit is a smaller job; see how to replace a broken paver. The material cost is close to nothing, since you are reusing the pavers, and the rented plate compactor is the only real expense.
When roots are the cause, slow down
A bump that grows is a different problem from a dip that settled. Roots sitting under the base will keep lifting whatever you put on top, so rebuilding to the same level may only reset the clock. Do not cut a large root to make room without finding out what that cuts the tree off from. Our page on pavers around a tree covers building a walk that leaves space for roots, and an arborist or a hardscape contractor can tell you what is safe before you dig.
Stop the thing that moved them
If water or a weak edge caused the movement, fix that before relaying. Check where the downspouts empty and whether the walk has a fall away from the house; our patio drainage guide covers slope and runoff. If the edge pavers have rolled outward, reinstall an edge restraint and read how to keep pavers from moving. Joints that have emptied should be refilled so the field locks together again.
If it is the public sidewalk, make two calls first
A sidewalk in front of your house is not always yours. Who owns it, who pays for repairs and whether you need a permit all vary by city. See sidewalks with pavers for who owns and pays. And before any digging, call 811, the free national before-you-dig service, because the pavers may sit over a line.
Re-level the dip, keep the pavers
Do not replace a whole walk for one bad patch. Measure the step, work out whether water, roots or a lost edge moved it, then lift only the section that failed, rebuild the base and relay the same pavers. It costs an afternoon and a rented compactor, and the walk goes back flat.
FAQ
How much unevenness between pavers is acceptable?
ICPI sets maximum lippage at 1/8 inch for pedestrian routes. For accessible routes, the US Access Board guide allows up to 1/4 inch without treatment, or 1/2 inch if beveled at no steeper than 1:2.
Why are my sidewalk pavers uneven?
Usually the base or bedding sand settled, water washed out the sand, the edge restraint failed or something is growing underneath. Where the paver sits relative to its neighbours tells you which.
Can I fix uneven pavers without replacing them?
Yes. Lift the section, rebuild the base and bedding sand, and relay the same pavers. That is the main advantage of pavers over a poured slab.
Is it okay to fill the gaps with more sand?
Sand in the joints helps with open joints but does not fix a dip. Adding sand under the paver to raise it is the wrong fix, because bedding sand should stay at about 1 inch and the base must be flat first.
Who fixes an uneven public sidewalk?
Ownership and upkeep rules vary by city, so ask your municipality who is responsible and whether a permit is required.
