Concrete Sidewalk Thickness for Walks and Crossings
Concrete sidewalk thickness is usually 4 inches for a residential walkway and 6 inches or more where vehicles cross, such as the section of public sidewalk at a driveway. Cities often publish their own standard drawings for public sidewalks, with set thicknesses, widths, joint spacing, and base requirements. If you are replacing a sidewalk along the street, those rules usually apply even though the homeowner pays.
Concrete calculator →Typical thicknesses
| Sidewalk type | Thickness |
|---|---|
| Garden or backyard path | 4 in |
| Front walk to the door | 4 in |
| Public sidewalk | 4 to 5 in, per city standard |
| Sidewalk across a driveway | 6 in or more |
| Commercial walk with carts or plows | 5 to 6 in |
Width
Front walks are commonly 36 to 48 inches wide. Public sidewalks are often 4 to 5 feet wide, and accessibility guidance generally calls for enough width for a wheelchair to pass, with passing spaces on narrower walks. Check your city’s standard.
Concrete per 10 feet of walk
| Width | 4 in thick | 6 in thick |
|---|---|---|
| 3 ft | 0.37 yd | 0.56 yd |
| 4 ft | 0.49 yd | 0.74 yd |
| 5 ft | 0.62 yd | 0.93 yd |
A 40-foot, 4-foot-wide walk at 4 inches takes about 2 yards. See how much concrete for a sidewalk or the concrete calculator.
Joints
Sidewalks are usually jointed every 4 to 5 feet, roughly matching the width, so panels are close to square. Expansion or isolation joints go where the walk meets a driveway, steps, a building, or the curb. Tool joints to about one quarter of the slab depth.
Base and slope
Lay 2 to 4 inches of compacted gravel under the walk. A cross slope of about 1/4 inch per foot or less lets water run off; accessible routes keep the cross slope gentle, typically no more than about 2 percent. Running slope follows the ground, but steep sections may need steps or ramps.
Public sidewalks and permits
Many cities require a permit to replace a sidewalk in the right of way, and an inspection of the forms before the pour. They may require specific thickness at the driveway crossing, a set concrete strength, and a broom finish. Some cities share the cost or run replacement programs. See who maintains the driveway apron for how responsibility is often split.
Tree roots and lifting
Tree roots are the most common cause of lifted sidewalk panels. Some cities allow root barriers or a slight reroute around a tree. Grinding or replacing a lifted panel can remove a trip hazard; mudjacking or foam lifting can level a panel that has sunk.
Bottom line
Most sidewalks are 4 inches thick, with 6 inches where cars cross. Use 2 to 4 inches of compacted gravel, joints every 4 to 5 feet, and a gentle cross slope. For sidewalks along the street, follow the city’s standard drawing and permit process.
Questions people ask
How thick should a concrete sidewalk be?
Four inches for typical walkways, and 6 inches or more where vehicles cross.
How thick is a sidewalk at a driveway?
Many cities require about 6 inches through the driveway crossing. Check your local standard.
How far apart should sidewalk joints be?
Typically every 4 to 5 feet, roughly equal to the sidewalk width.
Do I need a permit to replace a sidewalk?
Usually, for public sidewalks in the right of way. Private walks on your lot often do not.
How much gravel goes under a sidewalk?
About 2 to 4 inches of compacted crushed stone is common.
Related guides
- How Much Concrete for a Sidewalk? Yards per Foot
- Who Maintains the Driveway Apron
- Curb Cut for a Driveway: Permits, Rules, Process and What Affects the Cost
- Control Joint Spacing for a Concrete Driveway
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