Wheel Stop Installation
In St. Louis, MO

Wheel Stop Installation in St. Louis, MO

A wheel stop is a low barrier anchored at the head of a parking stall so a car’s front tires meet it before the rest of the vehicle meets something that costs money. That’s the whole job: stopping a bumper before it reaches a storefront window, a sidewalk, a landscape bed, or the clear width of an accessible route.

They do quieter work too. A wheel stop gives drivers a physical cue for where the stall ends, which keeps vehicles from creeping into walkways or hanging over the space behind them. On a sloped lot they’re a hedge against roll. And because a parked car’s overhang can eat two feet of a walkway that looked wide enough on the plan, a wheel stop is often what keeps a route usable rather than technically-there.

We install concrete and rubber stops on commercial properties across the metro. What follows is what the codes in this area actually say — including the parts most contractors get wrong.

What the ADA Actually Says About Wheel Stops

Start here, because this is the single most misrepresented point in our trade.

The ADA does not require wheel stops. The phrase “wheel stop” appears exactly once in the entire 2010 ADA Standards for Accessible Design — and it appears in an advisory, not in a requirement.

The actual requirement, Section 502.7, Relationship to Accessible Routes, reads in full: “Parking spaces and access aisles shall be designed so that cars and vans, when parked, cannot obstruct the required clear width of adjacent accessible routes.” That is an outcome. It tells you what must be true when a car is parked; it does not tell you what hardware to buy.

The wheel stop sentence lives next door, in Advisory 502.7: “Wheel stops are an effective way to prevent vehicle overhangs from reducing the clear width of accessible routes.” Note the wording — an effective way, not the required way. And advisories are not enforceable. The Department of Justice says so directly at 28 CFR Section 36.406(b), which governs private commercial facilities: advisory notes “explain or illustrate the requirements of the rule; they do not establish enforceable requirements.”

So a designer can satisfy 502.7 with a wheel stop, a curb, a bollard, a longer stall, or plain geometry that puts the overhang somewhere harmless. Any contractor who tells you the ADA mandates wheel stops is selling you something using a sentence that doesn’t say what they claim.

One more limit worth stating: even the 502.7 outcome requirement attaches at new construction and alterations, not as a standing obligation on a lot that’s been sitting there since 1994.

Three Jurisdictions in This Metro, Three Different Wheel Stop Rules

Here’s where it gets genuinely local, and where a generic “St. Louis requires wheel stops” claim falls apart. Missouri has no statewide building code for private commercial construction — adoption happens locally. In practice that means the rule at your lot depends on which line on the map you’re inside.

City of St. Louis — the strongest mandate. The City adopted the 2018 International Building Code and added a section the base code doesn’t have: Section 429, Parking Lots and Other Paved Surfaces. Section 429.2.4 requires that “Parking lots shall be provided with concrete wheel stops at least six inches above the parking lot surface” placed to keep a parked vehicle from extending over adjacent property or the public right-of-way — and it goes further than any other rule we found: “Wheel stops shall be so positioned such that both wheels of any car parked in the space shall contact the wheel stop.” Six inches, concrete, both wheels.

Unincorporated St. Louis County — five inches, and either/or. County zoning Section 1003.165 requires that a parking area extending to a lot line, sidewalk, walkway, planter strip, or building include “a concrete wheel stop or permanent curb,” with a minimum height of five inches and a minimum two-foot distance from the protected area. Read that “or” carefully — it’s a wheel stop or a curb, not a wheel stop mandate. And the section’s own scope clause limits it to “the unincorporated areas of St. Louis County,” which means it does not apply in Kirkwood, does not apply in the City, and does not apply in any of the county’s incorporated municipalities.

Kirkwood — curbs first, wheel stops as the fallback. Kirkwood inverts the logic most people assume. Its code requires six-inch concrete curbs around parking lot perimeters and islands. Wheel stops enter only when those curbs are waived — and then, “Where curbs are not provided, wheel stops shall be utilized to protect pedestrian areas, buildings, structures, or landscaping,” positioned “to allow for two feet of vehicle overhang area within the dimension of the parking space.” Kirkwood requires curbs. Wheel stops are plan B.

Notice that the two “two-foot” figures above are not the same rule: the County measures from the stop to the thing being protected, while Kirkwood measures the overhang allowance inside the stall. They get merged into a generic “two-foot setback” all the time. They shouldn’t be.

What No Code Specifies — and When Any of This Is Triggered

Just as useful as knowing the rules is knowing where they stop.

No code in this metro specifies wheel stop length. Not the ADA, not the City, not the County, not Kirkwood. If someone quotes you a “code-required six-foot stop,” that length is a product choice or trade practice, not a citation.

No code here specifies anchoring. Pin count, pin diameter, embedment depth, adhesive — none of the five jurisdictions we checked say a word about how a wheel stop is fastened down. That’s manufacturer specification and workmanship, and we’ll tell you what we’re proposing rather than dress it up as compliance.

Material is thinner than you’d think. The City and the County both say “concrete.” Kirkwood’s provision names no material at all. We install rubber stops as well as concrete, and we’re not going to tell you rubber is “code compliant” or “non-compliant” in a jurisdiction whose code doesn’t address it — we’ll tell you where it holds up and where concrete is the better call.

And most striping work doesn’t trigger any of it. The City’s Section 429.1 exempts restriping an otherwise-compliant lot when existing stripes are simply repainted, and exempts resurfacing, sealing, and striping done as ongoing maintenance. Kirkwood’s parking requirements are reviewed at site plan or building permit — triggered by development, expansion, or creating a new lot. So if you’re repainting faded lines, you are very likely not walking into a wheel stop obligation, and we’d rather say that than manufacture urgency.

The one real restripe trigger in Missouri law isn’t about wheel stops at all: RSMo Section 301.143 requires that when an owner of private property restripes a lot, one in every four accessible spaces — but not less than one — be served by an access aisle at least ninety-six inches wide and designated “lift van accessible only.” That’s an access aisle rule, and it’s worth knowing before you restripe.

Two honest limits on everything above. We researched the City of St. Louis, St. Louis County, and Kirkwood. St. Charles, Jefferson, and Franklin counties have their own ordinances we haven’t read, and St. Louis County contains dozens of incorporated municipalities that each write their own zoning — three jurisdictions gave us three different answers, so we won’t pretend a fourth follows the pattern. Tell us the address and we’ll find out what governs it. You can read the ADA parking requirements yourself in the 2010 ADA Standards for Accessible Design, Section 502.

We install wheel stops for retail centers, office and medical parks, industrial and warehouse properties, HOAs and apartment communities, schools, and municipal sites — commercial work only. Call (314) 800-0507 for a free estimate.