The 8 non-negotiables of car wash site selection in 2026

Our team has delivered 60+ sites and closed $300M+ across our careers. In our experience, the same eight variables decide whether a site clears 100,000 cars per year stabilized or struggles to hit 50,000. These are our site-screening priorities, informed by our projects and the public sources listed below.

1. Traffic count, but the right traffic count

AADT (annual average daily traffic) is the headline number, but it's the least useful in isolation. As an illustration, a site on a 30,000 AADT road with the right mix can outperform a site on a 50,000 AADT road with the wrong mix.

What actually matters:

• Captured side traffic (PM rush going home, not AM rush going to work)
• Speed profile: we underwrite to a 3-5 second decision window and prefer a posted 35 mph road to a 55 mph road.
• Median configuration: in our experience, full access (left in/left out) improves capture relative to right-in/right-out.

Minimum I underwrite: 25,000 AADT with PM-favorable directional split. Preferred is 30,000 to 40,000+ AADT. Below 25,000 AADT, the math gets hard fast unless you have an exceptional combination of demographics and limited competition.

2. Visibility from the road

We want the tunnel entrance visible from roughly 300 feet at 35 mph. That is our design screen for converting passing traffic. Sign height matters less than tunnel orientation. The tunnel should be visible, not the building.

3. Ingress and egress

Stacking depth on entry drives city permit decisions and peak-hour throughput. We spec 15-20 stacking spaces, initially allowing 20 feet by 10 feet per vehicle subject to local code and engineering review. Municipal minimums vary widely: Mayfield Heights, OH requires 8 per entrance, while Pembroke Pines, FL requires 18 on the entrance side. Our best-practice stack for a high-volume express is 18-20 vehicles.

Inadequate stacking kills throughput at peak and creates safety issues that get you cited by the city. In our experience, queue backing into the right-of-way is the single most common cause of car wash permit denials.

We favor a dedicated deceleration lane and a one-way internal traffic loop. We spec a minimum 25-foot throat from curb cut to first decision point and an 18-20 vehicle stack before the pay station, subject to the site's engineering and access approvals.

4. Household income and density within 3 miles

Three thresholds I look for in any trade area:

• Median household income: $65,000+ within 3-mile ring. We underwrite tighter than the broad industry floor because membership penetration drops off steeply below this line.
• Population: we look for 25,000+ within the 3-mile or 7-minute trade area and use daytime population of 15,000+ as our own screening target.
• Renters: we look for 35%+ within the trade area as part of our assessment of subscription demand.

In our underwriting, membership penetration ceilings out around 8-10% of unique monthly customers below these thresholds; above them, we model 14-18% in a mature market. These are our assumptions, not published industry averages or a percentage of the trade-area population. High-income households (over $150K) drive a disproportionate share of car wash revenue in MMCG's analysis, so income distribution matters as much as the median.

5. Competitive saturation

We use population per operating tunnel within the trade area to screen ramp risk. These are our saturation bands, informed by the 60+ sites our team has delivered across our careers, rather than an industry standard:

Count all operating conveyor tunnels (express plus flex) within the trade area, plus any sites with a Certificate of Occupancy or announced opening. Exclude in-bay automatics and self-serve from the competitive set. One Mister Car Wash three miles away matters less than four mom-and-pop tunnels within a mile.

Then ask the harder question: where do my cars actually come from? In an oversupplied corridor, your ramp depends on stealing share from incumbents and converting latent retail demand to membership. We model the math both ways before we recommend a site.

Context for 2026: ZIPS Car Wash filed Chapter 11 in February 2025 with the CEO publicly citing oversaturation from new builds outrunning demand. Multiple markets are now over-built. Permit moratoria have been reported in Birmingham (AL), Avon (OH), and a number of smaller jurisdictions through 2025-26.

6. Site dimensions and lot economics

Express exterior tunnel minimum: 0.8 to 1.0 acre. Flex sites need 1.2-1.5 acres. Anything below 0.8 acre means stacking compromises that hurt throughput.

Our dimensional walk-away rules, subject to the site layout:

• We pass on sites with less than 225 feet of depth to allow room for a 120-150 ft tunnel plus entry and exit stacking.
• We pass on sites with less than 175 feet of frontage on the primary road.
• Easements that bisect the developable area
• We treat detention requirements that consume more than 15% of the lot as a deal-killer.
• Residential adjacency (nuisance litigation risk)

Rectangular lots preferred. Corner lots command a premium. If the site doesn't pencil dimensionally, no creative engineering rescues it.

7. Entitlement and utility risk

The cheapest land is usually cheap for a reason. Before you sign a PSA:

• Confirm zoning allows car wash by-right (not just by special use permit). SUP-required sites add 30+ days per missed submittal cycle and can compound to 6+ months of carrying cost.
• Pull water tap availability and capacity. An increasing number of jurisdictions we build in require reclaim systems, with requirements documented in Pembroke Pines, FL and Water District 25, TX. Confirm the local rules and drought allocations. Colorado HB24-1362 (effective January 1, 2026) authorizes statewide greywater use but permits local governments to prohibit it; this does not replace site-specific car wash water and discharge approvals.
• Confirm sewer capacity for reclaim discharge
• Check for stormwater requirements that change the lot's net usable area
• Search for active moratoria. Multiple smaller jurisdictions extended car wash moratoria through 2025; assume more will follow as markets perceive saturation.

A 6-month entitlement delay costs you a full season. A 12-month delay can kill the deal. Realistic PSA-to-CO timeline in friendly jurisdictions is 12-18 months; SUP markets add another 6 months.

8. Co-tenancy and complementary uses

The highest-performing pattern: car wash adjacent to a high-traffic QSR (Chick-fil-A, Starbucks, Dutch Bros), grocery anchor, or convenience store with a strong gas pump count. Same trip, same driver, no behavioral change required.

There is a documented operating benefit in oil-change-plus-car-wash co-development. Driven Brands disclosed a 50+ location pipeline of Take 5 Oil Change plus Take 5 Car Wash co-developed sites before divesting the wash business to Whistle Express in April 2025. The co-development thesis (shared trade area, shared customer, shared real estate cost) was real; the corporate strategy fit was the issue.

Lowest-performing pattern: car wash on a strip-mall outparcel facing away from the anchor.

How we apply this at Wash Launch Group

Every site we develop goes through an 8-variable scorecard. We won't bring a deal to capital partners that scores below 75/100. Below 60/100, we don't bother running pro forma. The 25,000 AADT minimum, 0.8-acre dimensional floor, and trade-area saturation analysis are the hard gates; the demographic and co-tenancy variables are the differentiators that separate good sites from great ones.