Sometimes. Concrete sidewalk grinding shaves down a raised edge between two slabs, and it can make sense for a modest offset on slabs that are otherwise sound. It does not stop the slab from moving again, and it is not an answer for slabs that are cracked through, heavily tilted or still sinking. We found no City or NRMCA figure for how much height difference grinding can handle, so ask a contractor to explain their limit. A public sidewalk also has its own permit and cost rules.
Can a trip hazard be fixed by concrete sidewalk grinding? Sometimes. Grinding takes the top off a raised edge between two slabs so a foot no longer catches. It works on the lip, not the cause, so it only makes sense when the slabs are otherwise sound and have stopped moving.
When does grinding make sense?
Grinding is a surface cut. It fits a modest raised edge where the slabs on both sides are intact and the concrete is solid. We could not find a City or NRMCA figure for how much offset grinding can safely handle, so we will not name one. Ask any contractor what height difference they will grind and what they do beyond it.
Grinding does not suit:
- Slabs cracked through, or crumbling at the joint.
- A slab that is tilted along its whole length, not just at the edge.
- A slab that keeps sinking or rising. ACI lists settlement among the typical causes of cracking and uneven concrete (ACI), and settlement continues after you grind.
- Surfaces already flaking from salt, where you would be cutting into weak concrete (see why Chicago concrete flakes).
Why did the slab move in the first place?
If the edge rose, look up. Tree roots under a slab are one possible cause, and we cover them in why Chicago sidewalks heave. If the edge dropped, look down: soft or poorly compacted soil under the slab is the usual suspect, and NRMCA says a subgrade should be well compacted with soft spots removed (NRMCA). Grinding a slab on a bad base buys you a smooth edge for a while.
A sidewalk lip beside a parkway tree. The edge gets ground flat, and a few years later it is back because the root kept growing. Grinding was fine as a stopgap. It was not the repair.
Who handles it if the sidewalk is public?
A sidewalk in the public way is not just your slab. Any work in the public way needs a CDOT permit separate from the Department of Buildings permit (City of Chicago). A mason license is not required for concrete sidewalks (City of Chicago). A walkway on your own private property, not in the public way, is a different case: the City exempts installing or altering a concrete walkway that is no more than 30 inches above adjacent grade and not over a basement (City of Chicago).
If the City has flagged your sidewalk, read what to do about a sidewalk violation notice. The legal question of who pays is not clean, and we cover what is known in who pays for a broken sidewalk. Check with CDOT before you hire anyone to cut or replace public sidewalk.
The City's Shared Cost Sidewalk Program is a voluntary program where owners share the cost of reconstruction with the City. Applications go through 311 and funds are limited (City of Chicago). CDOT decides the scope, and only the portion it judges in need of replacement gets program pricing (City of Chicago). So the City may decide a slab needs replacing, not grinding.
If you want a second opinion on a trip hazard, our concrete crew will say plainly whether grinding is worth it. The sidewalk repair overview and the Chicago concrete guide cover the options.
Common questions
A modest raised edge on otherwise sound slabs often can. We found no City or NRMCA limit on how much offset grinding can handle, so ask a contractor what height difference they will grind and what they do beyond it.
It can. Grinding removes the lip but not the cause. If roots are pushing the slab up or the base keeps settling, the edge moves again. Replacement, or fixing the cause, is the lasting answer.
Work in the public way needs a CDOT permit, separate from any Department of Buildings permit. Confirm what applies to your sidewalk with CDOT before anyone starts cutting.
Sources
- City of Chicago, Department of Transportation: Shared Cost Sidewalk Program
- City of Chicago, Department of Transportation: 2026 Shared Cost Sidewalk Program Overview (PDF)
- City of Chicago: Guide to Building Permits: What Types of Work Do Not Require a Building Permit?
- City of Chicago: Guide to Building Permits: Mason Contractor License FAQ
- American Concrete Institute: RAP Bulletin 1: Structural Crack Repair by Epoxy Injection (PDF)
- National Ready Mixed Concrete Association: Concrete in Practice 4: Cracking Concrete Surfaces (PDF)
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.