The short answer
ADA sets specific requirements for accessible parking: at least one accessible space per 25 for lots up to 100 spaces (scaling up per the ADA table for larger lots), one van-accessible space per six accessible spaces, minimum widths, and marked access aisles. Restriping a lot triggers those 2010 ADA Standards requirements. Michigan lots are typically restriped every two to three years.
The Parking Lot Is the First Thing, Not the Last
Every customer experiences your parking lot before they experience your business. It is the first physical interaction, it happens while they are forming an impression, and it is the part of most commercial properties that gets attention last.
A lot with faded lines, no visible directional arrows and an accessible space nobody can identify does two things at once: it makes the business look unmanaged, and it creates a legal exposure.
What ADA Requires
Owners usually get caught out not through indifference but because nobody told them the numbers. The ADA Standards for Accessible Design set specific, countable requirements, and the Department of Justice is explicit that when a business restripes a lot, it must provide accessible spaces as required by the 2010 Standards. Restriping is inexpensive, so it is considered readily achievable barrier removal in most cases.
How Many Accessible Spaces
| Total spaces in lot | Minimum accessible spaces |
|---|---|
| 1–25 | 1 |
| 26–50 | 2 |
| 51–75 | 3 |
| 76–100 | 4 |
| 101–150 | 5 |
| 151–200 | 6 |
| 201–300 | 7 |
| 301–400 | 8 |
| 401–500 | 9 |
| 501–1,000 | 2% of total |
| 1,001 and over | 20, plus 1 for each 100 over 1,000 |
Additionally, at least one in every six accessible spaces must be van-accessible, and any lot with a single accessible space must make that space van-accessible. Hospital outpatient facilities and rehabilitation or outpatient physical therapy facilities have higher percentages for patient and visitor parking.
Dimensions and Access Aisles
- Car-accessible space: minimum 96 inches (8 ft) wide
- Van-accessible space: minimum 132 inches (11 ft) wide, or 96 inches with a 96-inch access aisle
- Access aisle: minimum 60 inches wide, marked to discourage parking, and level with the space it serves
- Shared aisles: two spaces may share one access aisle
- Route: spaces must connect to an accessible route to the entrance, and must be located on the shortest such route
- Slope: spaces and access aisles must not exceed 1:48 in any direction
- Signage: each space needs a sign with the International Symbol of Accessibility mounted at least 60 inches above the ground, measured to the bottom of the sign, with van spaces additionally marked "van accessible". A lot with four or fewer total spaces does not need the identification sign, though its accessible space must still be van-accessible
- Van clearance: van spaces, their access aisles and the vehicle route to them need at least 98 inches of vertical clearance, which matters in parking structures and under canopies
- Angled van spaces: each needs its own access aisle on the passenger side
The access aisle is often the part that gets lost. When a lot is restriped by someone working from what they can still see, faded aisle hatching frequently does not get reinstated — leaving a compliant-looking space that is not compliant.
Why Michigan Lots Fade So Fast
Our climate is unusually hard on pavement marking:
- Snow plows scrape directly across the paint, and a single hard winter of plowing removes a great deal of it
- Salt grit and slush scour the paint every time tires and plow blades pass over it
- Freeze-thaw cycling works at the bond between paint and pavement
- Sand spread for traction abrades the surface all winter
- UV fades the pigment through summer
As typical guidance, a Michigan lot needs restriping every two to three years. Lots that are plowed aggressively sit at the shorter end.
What Restriping Involves
- Clean the surface first. Paint does not bond to dirt, oil or algae. This is why striping and pressure washing are naturally scheduled together — and why lines applied over a dirty lot lift within a season.
- Layout. Either reproduce the existing layout or redesign it, which is worth considering if compliance is currently short or traffic flow is poor.
- Verify ADA compliance against current standards rather than simply repainting what was there. Lots striped decades ago frequently do not meet current requirements.
- Apply the paint in appropriate conditions — dry surface, suitable temperature, no rain in the forecast.
- Add markings: directional arrows, fire lanes, loading zones, stop bars, crosswalks, no-parking hatching.
- Install or verify signage, since striping alone does not satisfy the signage requirement.
- Cure time before traffic returns.
Because the lot must be empty and paint needs to cure, this work is generally done overnight or on a weekend, the same scheduling logic as commercial power washing, which is why the two pair naturally in one visit. Macomb Power Washing Solutions offers parking lot striping alongside cleaning, priced in a written, line-item quote.
Beyond Compliance: Capacity and Flow
Restriping is also an opportunity many owners overlook. A thoughtful layout can add usable spaces on the same asphalt, improve circulation so cars are not meeting head-on in a lane, define fire lanes properly, mark loading zones so deliveries stop blocking traffic, and make the traffic pattern legible to someone arriving for the first time. A lot laid out for a previous tenant with a different business may not serve yours well.
When to Restripe
- Lines are visibly faded or patchy from anywhere in the lot
- Customers park crookedly or between bays — a reliable sign the markings are no longer readable
- Accessible space markings, symbols or aisle hatching are indistinct
- The lot has just been sealcoated or resurfaced
- You have changed use, tenant or traffic pattern
- It has been more than three years
Best timing in Michigan is late spring through early autumn, when temperatures support proper curing. Late spring is particularly good: winter damage is visible and the lot looks its best through the busiest months. Parking structures carry their own salt problem, covered in how often to wash a parking garage.
The Bottom Line
Parking lot striping sits at the intersection of compliance and presentation, which makes it easy to defer and expensive to have deferred. The ADA requirements are specific and countable, Michigan winters remove paint faster than most owners expect, and a freshly striped lot is one of the most visible improvements a commercial property can make.
Sources
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