Dad finally agrees that the raised sidewalk needs attention. Good. That does not answer the first question.
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Can you fix it yourself, or does the job belong to a concrete contractor?
The answer does not begin with tools. It begins with ownership. A strip of concrete can look like part of Dad's yard while sitting in a public right-of-way. In the City of St. Louis, property owners are responsible for maintaining adjoining sidewalks, but reconstructing a public sidewalk requires city involvement. Sidewalks and driveways entirely within the property line are treated differently. The city rules and federal accessibility standards behind those distinctions are collected in the site's source notes.
Mark the defect before anyone proposes a cure
Do not start with, "The sidewalk is bad." Mark the exact place where the walking surface changes.
Use painter's tape or chalk to outline the problem. Photograph it from both directions with a ruler or tape measure standing beside the raised edge. Then write down four things:
How high is the vertical change? Is the slab merely chipped, or has one whole side lifted? Does the slab rock under weight? Where does water go after rain?
Those answers separate a surface defect from a moving slab, a drainage problem, or a tree-root problem. A bag of patching material may soften a sharp lip. It does not make a rocking slab stable, move water away from the house, or persuade a root to stop growing.
Also watch Dad use the route. Do not coach him for the demonstration. See which direction he approaches, whether he looks down, and whether he uses a cane, walker, railing, wall, or parked car. The useful repair has to work on his actual line of travel, not just look smooth from the driveway.
Find out whose concrete it is
Locate the house survey, subdivision plat, closing papers, or county parcel map. These may help you find the boundary, but a parcel map is not a field survey. If the questionable slab sits between the street and the likely property line, assume it may be in the public right-of-way until the local public works or streets department says otherwise.
Do not rely on a neighbor's memory of who poured the last slab. Call the government that controls that address. In the metro, that may be St. Louis City, St. Louis County, or a separate municipality. Ask:
"Is this slab private property or public right-of-way? Does grinding, patching, lifting, or replacing it require approval? May the homeowner do the work? Is there a city repair or cost-sharing process? Who inspects the finished work?"
Write down the department, the answer, and the permit or case number. The City of St. Louis distinguishes ordinary work inside the property line from sidewalk reconstruction in the public way, and it has a separate sidewalk process. Start with the correct jurisdiction through Local Help in St. Louis, then confirm the rule for Dad's exact address.
The DIY lane is narrower than the hardware aisle suggests
A do-it-yourself repair is worth considering when all of these are true:
The surface is confirmed to be on private property, or the controlling department expressly allows owner-performed work. The slab is solid and no longer moving. The defect is small enough for the repair product's stated thickness range. The repair will not create a steep wedge, narrow the route, trap water, or interfere with a door or gate. You can close the route for the full preparation and cure time. You can prepare the concrete exactly as the product instructions require.
Read the entire product label before buying. Check the permitted minimum and maximum thickness, whether bonding agent is required, acceptable surface temperature, preparation method, working time, cure time before foot traffic, and whether the material is rated for exterior freeze and thaw exposure. "Concrete repair" on the front of a bag is not a scope of work.
Grinding can also be a DIY-sized idea, but only when the slab is sound and the raised edge is modest. Before choosing it, determine how much material must come off, whether grinding will expose weak aggregate, and where the dust and slurry will go. Protecting eyes and lungs and controlling silica dust are part of the job, not optional cleanup.
If you cannot describe how you will keep Dad off the wet repair, the DIY plan is incomplete. A cone beside the work is not a barrier. Pick an alternate entrance, secure both ends of the route, and tell every expected visitor which door to use.
Hire the whole problem when the slab is telling you something
Bring in a contractor when the slab rocks, several slabs have shifted, the route drains toward the house, a root is lifting the walk, the repair reaches a curb or driveway apron, or public approval is required. Hire it out as well when the only proposed patch would create a short, steep ramp.
Accessibility standards use slope, landings, width, edge protection, and changes in level together. A shallow-looking wedge can still be too steep or can create a new edge at its lower end. Federal ramp measurements and the local permit distinctions are summarized with links to the underlying authorities on the Sources page. A private residence is not automatically governed in every respect by rules written for public facilities, but those measurements are useful warning lines when somebody proposes a homemade ramp.
Tree roots require a second decision. Do not let a concrete crew cut roots merely because they block the form. Ask who will evaluate the tree, who may authorize root work, and whether the long-term plan is slab replacement, rerouting the walk, root management, or tree work. The cheapest concrete answer can become the expensive tree answer.
Make three contractors price the same repair
Give each bidder the same marked photographs and the same written scope. Ask for separate answers to these questions:
Will you grind, lift, remove, or replace the slab? If replacing it, where are the full boundaries of removal? What base preparation and compaction will you perform? How will you match the adjoining height without sending water toward the house? Who handles the permit and inspection? Who checks for utilities? Who handles roots? How will the route be barricaded, and when may Dad walk on it again? What cleanup is included? What written warranty applies to settlement, cracking, and separation from adjacent slabs?
If the work is in a public sidewalk, ask the contractor to name the governing detail or approved plan. In the City of St. Louis, public sidewalk reconstruction is handled differently from a cosmetic patch inside the property line. Do not accept "we do these all the time" as the permit answer.
Also ask for proof of insurance and the exact business name that will appear on the permit, contract, and payment. Compare those names before work begins. If one company sells the job and another performs it, the contract should say who is responsible for the permit, damage, inspection corrections, and warranty calls.
Do not let the permanent repair wait without a temporary route
A permit call or contractor schedule does not flatten the concrete tonight. Until the permanent work is complete, make the safer route the easier route.
Move deliveries to another door if one exists. Turn on the route lighting before dusk. Remove hoses, planters, loose mats, and parked objects that force Dad toward the raised edge. Mark the lip with high-contrast tape only if the tape will remain flat and dry. Do not build a loose plywood bridge or rubber wedge that can slide, hold water, or become a second trip point.
Tell Dad what you are doing in practical terms: "I am not closing your front door. I am marking the bad slab, finding out whose concrete it is, and getting one repair plan that will stay put." That keeps the conversation on the route instead of turning it into a referendum on his independence.
The next concrete move
Tonight, photograph the raised edge with a ruler beside it, mark the exact slab, and find Dad's street address on the correct city or county property map. Tomorrow, call the department that controls the right-of-way and ask whether that slab is public, whether the proposed repair needs approval, and whether Dad may perform it himself. Do not buy concrete until those three answers are written down.