Sunken Sidewalk Repair: Trip Hazards, Lifting Costs, and Who Pays
A sunken sidewalk slab costs $400–900 to mudjack or $800–2,500 to foam-lift for about 100 sq ft, and a single square usually costs the contractor's $300–700 job minimum. Replacing 100 sq ft runs about $660–1,560 at US median prices. A lip under 1/2 inch can often be ground flat instead. Before paying, check whether your city makes the adjacent owner responsible, and whether it runs a cost-share program.
Lifting a sunken sidewalk costs $400–900 by mudjacking or $800–2,500 with foam for about 100 sq ft, and one sunken square usually costs the $300–700 job minimum. Replacing 100 sq ft runs about $660–1,560 at US median prices, including removal. A lip under about 1/2 inch can often be ground flat for less. Check who is responsible before you pay: in many cities it is the adjacent property owner, and some cities share the cost. Price your own slabs in the concrete lifting cost calculator.
When a Sunken Sidewalk Becomes a Trip Hazard
The 2010 ADA Standards for Accessible Design set the limits most city inspectors use:
| Vertical offset | ADA treatment (sections 303.2–303.3) | Typical repair |
|---|---|---|
| Up to 1/4 inch | Allowed as is | None, monitor |
| 1/4 to 1/2 inch | Must be beveled | Grind a bevel into the high edge |
| Over 1/2 inch | Must be ramped | Lift the low slab or replace |
A slab that is still sinking will cross the next line within a season or two, so fix the cause (usually water from a downspout or sprinkler) at the same time.
Sunken Sidewalk Repair Cost
| Repair | Cost |
|---|---|
| Grind or bevel a lip | often cheaper than a lift visit; get a quote |
| Mudjack one square (25–30 sq ft) | $300–500, set by the job minimum |
| Mudjack 100 sq ft | $400–900 |
| Foam-lift 100 sq ft | $800–2,500 |
| Replace 100 sq ft, US median | $660–1,560 incl. removal |
Lifting prices are HomeGuide 2026 averages. The replacement row uses the US median new-sidewalk price in the SlabCalc Concrete Cost Index ($4.63–9.62 per sq ft) plus $2–6 per sq ft for removal.
Lift or Replace, by Metro
Sidewalk replacement is priced from each state DOT's own concrete sidewalk bid records, so it reflects what poured sidewalk costs in that market. For 100 sq ft:
| Metro | Replace 100 sq ft (incl. removal) | Mudjack ($400–900) as share of replacing |
|---|---|---|
| New York, NY | $1,205–2,862 | 32% |
| Charlotte, NC | $796–1,767 | 51% |
| Denver, CO | $799–1,677 | 53% |
| Minneapolis, MN | $763–1,562 | 56% |
| Miami, FL | $673–1,389 | 63% |
| Los Angeles, CA | $541–1,471 | 65% |
| Chicago, IL | $663–1,321 | 66% |
| Houston, TX | $592–1,297 | 69% |
Sidewalks are the project where lifting saves the least: the squares are small, so the job minimum takes a large share of the price. In most metros outside the Northeast, replacing a short run costs little more than lifting it, and the new concrete comes with a new base. Size a replacement with the concrete sidewalk calculator.
Who Pays for Public Sidewalk Repair
Responsibility for the public sidewalk in front of a house varies by city:
- Owner-responsible cities require the adjacent owner to keep the sidewalk in repair, and may send a notice after an inspection or complaint.
- Cost-share programs split the bill between the city and the owner, or let the owner pay for city-hired work over time.
- City-maintained sidewalks are repaired by the city, sometimes only after a request.
Ask your city's public works or transportation department before hiring anyone. Work in the public right-of-way often needs a permit, and some cities only accept licensed or approved contractors. For a private walkway on your own lot, none of this applies.
Why Sidewalks Sink
- Tree roots: living roots lift slabs; removed or decayed roots leave voids that let them drop.
- Water: downspouts, sprinklers, and poor grading wash soil from under the slab edge.
- Uncompacted fill: common along new foundations and over utility trenches.
The concrete settling guide explains how to read the cause from the pattern.
Key Takeaways
- A single sunken square usually costs the $300–700 job minimum to lift
- 100 sq ft costs $400–900 to mudjack, $800–2,500 to foam-lift, or about $660–1,560 to replace
- Offsets over 1/2 inch must be ramped under the ADA; smaller lips can often be ground
- For sidewalks, replacing is often close in price to lifting, so get both quotes
- Check with your city first: owner responsibility, cost-share, and permit rules vary