Concrete Curbs: The Complete Guide
A concrete curb is a raised strip of concrete that edges or separates two surfaces: a lawn from a bed, a driveway from the yard, or a street from the sidewalk. At home it usually means a low decorative border; on streets and parking lots it's a taller curb, often poured with a gutter that carries stormwater. This guide covers where curbs are used, the standard sizes, what goes under them, and how to estimate one.
Where concrete curbs are used
- Landscape edgingA low border around beds and trees.
- DrivewaysEdges the drive or lets cars roll over.
- Parking lotsIslands, lot edges and wheel stops.
- StreetsCurb and gutter that drains the road.
For every profile side by side (barrier, mountable, flush, mow strip, wheel stop and asphalt), see types of curbs.
Standard curb dimensions
The closest thing to a national default is 6 inches of exposed height on a 6 inch wide top, often with a 24 inch gutter pan. The rest varies by city and state:
| Standard | Height | Top | Other |
|---|---|---|---|
| New York City | 7 in reveal | 6 in | 18 in deep, gutter typically 6 to 12 in |
| Sonoma County, CA | 6 in | 4 in min | 24 in gutter, 1-1/2 in batter |
| Santa Barbara, CA | 24 in gutter, 1.5:12 batter | ||
| Wisconsin DOT | 2 in per ft face batter, 6 in min gutter thickness |
Where a curb stops being drivable is a published number too. TxDOT calls a curb vertical, the barrier curb, if its face is "6-in or higher" and mountable if it's "less than 6-in in height," with 4 inches or less preferred. More in how tall is a curb.
Base, rebar and joints
Base
It depends on the city. Sacramento County requires "a 6-inch thick Class 2 aggregate base section" under curbs; Santa Barbara wants 6 inches of crushed base at 95 percent compaction over 8 inches of compacted native soil. Wisconsin DOT adds base only where the plans show it.
Rebar
Usually not. The federal UFGS 32 16 19 spec says "reinforcement steel normally will not be required for curb and gutter construction." Some cities do reinforce: Sonoma County runs continuous No. 3 bars, and NYC may require bars.
Joints
Contraction joints about every 10 feet is the most common spec. UFGS allows 5 to 15 feet and Wisconsin 6 to about 20. UFGS spaces expansion joints 30 to 120 feet apart.
The concrete itself
For street curb, the federal UFGS spec is the clearest single recipe: 3,500 psi at 28 days, 5 to 7 percent air for freeze-thaw, and a slump of 3 inches (plus or minus 1) for hand-formed curb but only 1 inch (plus or minus 1/2) for slipformed curb, which has to hold its shape as it leaves the machine. Landscape curbing is a different material: curbing machine maker Miller Curber calls for a sand and cement mix at 3:1 to 5:1 with 0 to 1 inch slump. See curbing machines and extruded curb.
Where a driveway or sidewalk meets the curb
Cutting a street curb for a new driveway means pouring a driveway apron, and that concrete sits in the public right of way. Expect a city permit, the city's thickness and mix, and often an inspection before the pour. See driveway aprons and curb cuts. Where a sidewalk meets a crossing, the curb drops into a federally regulated curb ramp. In permit language, a "curb cut" is the driveway opening and a "curb ramp" is the pedestrian one.
Cost and estimating
Landscape curbing and street curb are priced as different products. Street curb at public bid swings with job size: Arkansas DOT's June 2026 weighted averages show Type D curb at $94.10 a foot on a 99 foot job, and long runs bid far lower. The curb cost guide covers both.
To size the concrete, you need the total length and the cross-section. Use the concrete curb calculator for a curb on its own, or the curb and gutter calculator for a section with a pan. Pouring it yourself? How to pour a concrete curb has the steps, and curb repair covers cracked or heaved sections.
All concrete curb guides
- Concrete Curbing CostConcrete curb cost from public bid prices with quantities, what landscape curbing costs per foot, why small jobs cost triple, and the minimums nobody posts.
- Landscape Curbing & EdgingLandscape curbing is a zero-slump sand and cement mortar, not ready-mix. The mix, profiles with quantities, why joints sit every 2 to 4 feet, and mow strips.
- Precast Concrete CurbPrecast concrete curb: which DOTs allow it, published sizes and weights, how it is bedded and jointed, and the federal contradiction over parking wheel stops.
- How to Pour a Concrete CurbPour a concrete curb by hand, step by step: layout, building forms, the gravel base, the right concrete mix, finishing the top, and curing time.
- Concrete Curbing MachinesA concrete curb machine extrudes continuous landscape curbing in one pass. See how they work, real brand prices, new vs used cost, and why rentals are rare.
- Concrete Curb and GutterConcrete curb and gutter costs about $8 to $24 per linear foot installed. See standard dimensions, curb types, how it is formed, and how to figure the concrete.
- Types of Concrete CurbsThe 8 types of curbs side by side: barrier, mountable, curb and gutter, flush, mow, landscape, wheel stop and asphalt, with heights, uses and cross-sections.
- Extruded CurbExtruded curb is machine-placed with no forms. The stiff concrete mix, how it is pinned to pavement, extruded asphalt curb, why Caltrans calls it a dike, cost.
- How Tall Is a Curb?A standard street curb is about 6 inches tall, with a federal range of 3 to 9 inches. Published heights by agency, why six is the norm, and what drives the rest.
- Barrier CurbsThe barrier curb is the tall vertical street curb that keeps cars on the road. Published face heights and batter by agency, where it is required, and cost per foot.
- Mountable CurbsMountable (rolled) curbs explained: DOT heights and face slopes, how they compare with barrier curbs, where each is required, drainage trade-offs, and cost.
- Ribbon CurbA ribbon curb is a flat, flush concrete edge strip, not a raised curb. How it differs from barrier and rolled curb, published widths, depths, rebar, and cost.
- Concrete Curb RepairFix a cracked, spalling, or broken concrete curb. Learn repair vs replace, a step-by-step patch method, DIY material costs, and when you need a permit.
- Concrete Driveway ApronThe apron sits in the public right of way, so the city sets the spec. Thickness, permits and bonds, curb cuts, who pays when it fails, and concrete quantities.
- Concrete Curb RampADA and PROWAG requirements quoted: slopes, widths, landings, truncated dome geometry, when a city must build one, and why most existing ramps fail on slope.
Frequently asked questions
What is a concrete curb?
A raised strip of concrete that separates two surfaces, such as a lawn from a garden bed or a street from a sidewalk. It can be poured in forms or extruded in one continuous run by a curbing machine.
What is the difference between curbing and edging?
Edging is the general job of defining a border, and it can be done with plastic, steel, brick or concrete. Concrete curbing specifically means a poured or extruded concrete edge, which is more permanent than the alternatives.
How tall is a standard concrete curb?
About 6 inches of exposed face on a street, with a 6 inch wide top. Mountable curbs are lower, 4 inches or less where TxDOT prefers it, and landscape curbing is usually a few inches above grade. See how tall is a curb.
Does a concrete curb need rebar?
Usually not. The federal UFGS 32 16 19 specification says reinforcement steel normally will not be required for curb and gutter. Some cities do reinforce, so check your local standard detail.
How much does concrete curbing cost?
Landscape curbing and street curb are priced as different products. Street curb at public bid swings with job size, up to $94.10 a foot for Type D curb on a 99 foot job in Arkansas DOT's June 2026 averages. The curb cost guide covers both.
Can concrete curbing be removed later?
Yes. Extruded landscape curbing is not tied into a foundation, so it can be broken up and hauled away, though it is more work than pulling plastic edging.