The six cheapest ways to fix a sidewalk, from least to most expensive, are: sealing (prevents damage, a DIY job), patching cracks and spalls, grinding or saw-cutting raised edges, slab lifting (mudjacking or polyurethane foam), resurfacing a worn but sound slab, and replacing single panels instead of the whole run. The damage decides which one you need. Surface wear and hairline cracks need patching and sealing. A trip lip up to about 1.5 inches can be ground down. A slab that has sunk but is still in one piece can be lifted. Concrete that is broken through, heaved by roots, or crumbling has to be replaced. Fixing only the panels that are actually failing is the biggest saving available.

Which method fits which damage?

*Prices vary a lot by region, access, how many panels you do at once, and whether a city permit is needed. Get two or three quotes. Bundling several defects into one visit usually cuts the cost per repair, because the minimum charge is spread across more work.

What height difference counts as a hazard?

The 2010 ADA Standards for Accessible Design (Section 303) allow a vertical change in level of up to 1/4 inch. A change between 1/4 and 1/2 inch must be beveled no steeper than 1:2. Anything over 1/2 inch is treated as a ramp. Most cities use similar thresholds to decide whether a sidewalk is out of compliance.

The bigger change since many older guides were written: the U.S. Access Board published the final Public Right-of-Way Accessibility Guidelines (PROWAG) in 2023. They cover sidewalks, curb ramps, and crossings in the public right-of-way. They become enforceable once the Department of Justice and Department of Transportation adopt them, and many municipalities already design to them. If your sidewalk is in the public right-of-way, check your city’s rules before you hire anyone.

We feel this ourselves. When we scout exterior locations for shoots, a 1/2-inch lip is enough to jolt a dolly move or tip a loaded equipment cart, and that is the same edge that trips a pedestrian.

Who has to pay for the repair?

In many U.S. cities, including Portland, Oregon, the owner of the property next to the sidewalk is responsible for repairing it and can be liable for injuries. Other cities run shared-cost or city-funded programs. Some offer rebates if you fix a defect before an inspector cites it.

Call your city’s transportation or public works department before you start. A permit may be required even for grinding, and a contractor the city has already approved will save you a failed inspection.

How do patching and sealing work, and what goes wrong?

For a patch, cut out loose material, clean the area, and dampen it. Then apply a bonding agent or a polymer-modified repair mortar and finish it flush with the surrounding surface. Patches fail mostly for two reasons: the surface wasn’t prepared, or the mortar was spread too thin at the edges (“feathered”), where it peels off after one winter. Use a product rated for the depth you’re filling.

Seal with a penetrating silane or siloxane sealer. It keeps out the water that causes damage from freezing and thawing and from deicing salts. Wait until new concrete or patches have cured, and reapply every few years as water stops beading on the surface. The Portland Cement Association also advises against using deicers on concrete in its first winter.

Is grinding safe to DIY?

Grinding with a diamond cup wheel removes a lip in minutes. It leaves a rougher, lighter-colored patch and can’t fix a slab that is still moving. Saw-cutting at an angle leaves a cleaner bevel and is what many city programs specify.

The real DIY risk is the dust. Concrete dust contains crystalline silica, and the OSHA respirable crystalline silica standard requires construction crews to use water suppression or shrouded tools with vacuum extraction. Don’t dry-grind concrete without at least one of those controls and a fitted respirator.

Mudjacking or foam lifting?

Both work by drilling holes in the sunken slab and pumping material underneath to raise it.

• Mudjacking pumps a slurry of soil, sand, water, and usually Portland cement through holes about 1 to 2 inches across. It is cheaper, but the slurry is heavy, and it can wash out if the reason the slab sank (often poor drainage) isn’t fixed.
• Polyurethane foam goes through holes of about 5/8 inch, weighs much less, doesn’t absorb water, and can carry foot traffic within hours. It costs more per square foot.

Neither works on a slab that is cracked into several pieces. Neither fixes roots, which keep pushing. Redirect downspouts and grade the soil away from the walk first, or the slab will sink again.

When is resurfacing or replacement worth the money?

Resurfacing puts a thin cement-based overlay on a slab that is structurally sound. Any crack running all the way through the slab will come back through the overlay, so it only pays off when the damage is purely on the surface.

Replace a panel when it is broken through, heaved by roots, or has lost its base. A proper replacement includes a compacted aggregate base, control joints, and drainage. The American Concrete Institute‘s residential guidance (ACI 332) covers the specifications. Cutting out one or two failed panels, rather than a whole run, is usually where the real savings are. If a street tree caused the heave, many cities require an arborist or a permit before roots can be cut.

To decide what you need: measure every lip with a ruler, photograph each defect, and check your city’s sidewalk rules and permit requirements. Then ask contractors to quote each defect separately using the table above. Seal anything you don’t repair this year.