Car Wash Construction: The Specialty Tunnel and Self-Serve Facilities Beyond General Commercial Construction

Car washes have grown substantially with express tunnel washes dominating new construction. Tunnel/express washes are conveyor-driven exterior washes with quick throughput. In-bay automatic washes wash one car at a time in stationary bays. Self-serve washes provide bays where customers wash their own cars. Detail and full-serve operations have additional staff-driven services. Specialty plumbing with water reclaim, specific drainage, equipment installation, and customer-facing components distinguish car wash construction. Understanding car wash construction helps GCs serve this growing specialty.

This post covers car wash construction.

Car Wash Types

Multiple car wash formats:

Multiple car wash formats. Tunnel/express most common new construction — conveyor pulls cars through tunnel of equipment, exterior wash, dryer at exit. In-bay automatic with single bay where car is stationary while equipment moves. Self-serve with multiple manual bays. Full-serve with staff hand-washing. Detail centers for thorough cleaning. Express detail for faster service. Specific to market — express dominates new construction due to throughput and revenue.

Tunnel Construction

Tunnel structure substantial:

Tunnel construction substantial. Concrete tunnel structure typical. 120-180+ feet typical length for full wash sequence (presoak, soap, wash, rinse, wax, rinse, dry). Specific equipment mounting points. Substantial drainage trenches throughout. Lighting throughout for customer experience and equipment visibility. Glass viewing for customers in vacuum bays watching their cars. Specific customer flow from pay station through tunnel to vacuum/dry area. Pay station integration with tunnel entry.

Water Reclaim

Water reclaim reduces costs and impact:

Water reclaim systems reduce water use and costs. Underground reclaim tanks collect wash water. Filtration and treatment removes solids, oils. Recycled water used for prewash and soap rinse stages. Fresh water for final rinse to prevent spotting. Substantial water savings 60-80% vs no reclaim. Code requirements increasingly common in water-restricted areas. Specific to local water authority — some areas mandate reclaim or limit total water use per wash.

Drainage

Drainage extensive:

Drainage extensive throughout. Trench drains throughout tunnel for wash water. Substantial drainage capacity — thousands of gallons during peak. Sand/grit interceptors as pre-treatment. Oil/water separators remove petroleum from wash water. Connection to sewer with pre-treatment as required by POTW. Site drainage for parking and queuing areas. Specific permits including industrial wastewater discharge sometimes.

Equipment Installation

Equipment manufacturer-installed:

Equipment installation typically by manufacturer or specialty installer. Specific manufacturer (Sonny's, NS Wash Systems, others) provides equipment. Conveyor system pulls cars through. Wash arches and friction equipment apply soap, water, friction. Detergent/wax dispensing. Dryers with high-velocity air at exit. Coordination between construction (tunnel concrete, plumbing rough-in) and equipment installation. Specific utilities at each piece (water, power, compressed air).

Site and Queue

Site supports operations:

Site supports operations. Queue lanes substantial during peak — 20+ car queue capacity. Pay station with multiple lanes typical. Stack-up area before tunnel for short queue. Vacuum/dry area after tunnel where customers vacuum interiors. Specific traffic flow from arrival through queue, pay, wash, vacuum, exit. Site drainage including for queue and vacuum areas. Lighting for night operations — car washes typically open extended hours.

Building

Customer-facing building:

Customer-facing building combines functions. Pay station and entry. Customer waiting area in some formats (less in express). Restrooms. Office space for operations. Equipment room (mechanical) for pumps, compressors, controls. Chemical storage with appropriate containment. Quality finishes for brand experience. Signage prominent for visibility from road. Building design contributes to brand recognition for chain operators.

Bottom Line

Car wash construction includes tunnel/express, in-bay automatic, self-serve, and full-serve formats. Tunnel construction substantial concrete structure. Water reclaim systems reduce water use. Drainage extensive. Equipment installation typically by manufacturer with construction coordination. Site supports queue, payment, and vacuum operations. Customer-facing building completes facility. For GCs serving automotive services and chain operators, car wash construction is growing specialty deserving expertise. Quality construction supports operations for years; deficient construction (drainage, water management, equipment integration) creates persistent operational issues. Express car wash growth makes this expanding specialty.