Due Diligence

Due diligence in this asset class is conceptually straightforward but operationally demanding. The seller has been running the business for years and knows where the bodies are buried; the buyer typically has weeks to find them. What follows is a working framework organized by workstream, with specific emphasis on the issues that most commonly kill deals or come back to haunt new owners.

Financial diligence

The goal is to build a clean, defensible view of revenue, costs, and EBITDA — independent of the seller’s adjustments.

Revenue quality. Build the revenue stack from observable inputs:

• Wash counts per day (most POS systems capture this; verify it’s complete).
• Revenue per car broken out by retail vs. membership.
• Member roster with billing status, plan tier, enrollment date, and trailing 90-day collection.
• Ancillary revenue by category.

The seller-provided P&L is a starting point; the wash-count-up build is the validation.

Member roster validation. Spend disproportionate time here. Specifically:

• Reconcile the headline member count to the count of accounts that successfully billed and collected in each of the last three months.
• Identify members whose payment method has been declining (often 5–15% of the headline count).
• Identify comp, employee, and trial accounts that count as members but produce no revenue.
• Map the tenure distribution and pricing distribution — high concentration on legacy low-priced plans is a red flag for pricing-driven churn risk.

Add-back scrutiny. Quality-of-earnings work should focus on the typical inflation tactics:

• Owner compensation normalization (often legitimate, sometimes overdone).
• “One-time” expenses that recur with different labels each year.
• Marketing spend treated as growth investment when it’s actually maintenance.
• Maintenance capex categorized as growth capex.

Trailing 12 months vs. run-rate. Membership-heavy businesses can have meaningful divergence between TTM and run-rate, particularly during periods of growth or churn. Both views matter; neither alone is sufficient.

Operational diligence

Equipment condition and lifecycle. Tunnels are equipment-intensive. Critical inspections:

• Conveyor age and condition (typically a 7–10 year major refresh).
• Dryers, arches, and chemical application systems.
• Water reclaim system functionality and capacity.
• Point-of-sale, RFID, and membership platform integrity.

A site that looks operationally fine on the day of the site visit may have $400,000–$1,000,000 of deferred capex due in the next 18 months. Get a qualified third-party equipment inspection; don’t rely on seller representations.

Staffing and labor. Review:

• Schedule efficiency vs. actual demand pattern (most underperformers are over-staffed at off-peak times and under-staffed at peak).
• Turnover rates and whether key positions are filled by reliable people.
• Wage compliance and overtime patterns.

Throughput analysis. What’s the actual cycle time per car? What’s the realized throughput at peak vs. theoretical capacity? Operationally constrained sites may have meaningful upside from process improvements; sites already at capacity have a different conversation about expansion or pricing.

Environmental and safety. Express tunnels use significant chemicals and water. Issues to flag:

• Chemical storage compliance.
• Water discharge permits and any history of violations.
• Underground tanks if applicable (more common on legacy converted sites).
• Recent EPA or state environmental inspections and findings.

Environmental issues are rare to be deal-killers in this asset class but are common enough to be deal-modifiers, and they should never come up as surprises post-close.

Real estate diligence

If you are acquiring the dirt as well as the operating business — common, but not universal — the real estate diligence is its own workstream:

• Title and survey. Standard real estate review.
• Zoning compliance and conditional use permits. Express tunnels have specific zoning treatment in many jurisdictions; verify nothing relies on a grandfathered approval that could be challenged.
• Lot characteristics for future expansion. As covered in the site selection page — can a second tunnel be added later?
• Lease analysis if not owned. Term remaining, rent escalators, renewal options, and any restrictive use clauses. Short remaining lease terms on otherwise attractive sites are a meaningful issue and should be addressed in deal structure.

Commercial diligence

This is the section that most acquirers under-invest in, and it is the section where Wash Index provides the most direct value to buyers.

Trade area validation. Is the site’s catchment area what the seller and the broker say it is? Pull:

• Updated AADT counts.
• Trade area demographics at 3-mile and 5-mile or appropriate isochrone radii.
• Review-derived signal on competing sites (volume, rating, and structured analysis of customer-reported wait times, quality, and pricing perception).

Competitive landscape. Map every competing site within the relevant trade area:

• Operator, format, age, equipment condition (where observable).
• Performance signal (review volume and rating trajectory as proxy for traffic and customer satisfaction).
• Pricing structure and membership program.
• Recent openings and any visible construction or permits for planned new sites.

Saturation analysis. Calculate express tunnels per 10,000 households in the trade area. Compare against benchmarks. Flag any market that’s at or past the threshold where new sites cannibalize rather than expand demand.

Planned development. Search permits, zoning agendas, and broker pipelines for planned new car wash development within the trade area. A target that looks fine today but has two competitor sites permitted within two miles is not the same target it looks like in the static analysis.

Red flags that should slow or kill a deal

Patterns we’d encourage buyers to take very seriously:

• Declining capture or RPC trend over the trailing 12–24 months without a clear, fixable cause.
• Membership churn accelerating in recent quarters, particularly if a new competitor opened nearby.
• Member roster that the seller cannot produce in clean, exportable form with billing status and tenure.
• Significant deferred maintenance evident from equipment inspection.
• Environmental issues or open regulatory matters.
• Concentration risk — multi-site deals where one site contributes a disproportionate share of EBITDA, particularly if that site has any of the above issues.
• Saturation indicators in the trade area that the seller’s narrative ignores.

How to structure the diligence sprint

A workable cadence for a $20–80 million transaction:

• Weeks 1–2: financial data room review, initial site visits, equipment inspection scoping.
• Weeks 2–4: equipment inspections completed, member roster validation, environmental site review, commercial diligence on trade areas.
• Weeks 4–6: quality of earnings completion, real estate review, integration planning, draft revised model.
• Weeks 6–8: final committee approval, definitive documentation.

This is compressible but not by much. Skipping or shortcutting any of these workstreams is where post-close surprises come from.

What this work is worth

A thorough diligence process on a single-site or small-platform deal typically costs $75,000–250,000 across all advisors and third parties. On a larger platform deal, $500,000–1.5 million. These numbers feel large until you weigh them against the cost of a deal that closes on bad information. Particularly in the current environment — tighter multiples, less margin for error — diligence quality is one of the highest-leverage line items on the deal budget.