Car wash site plans

The layout in one line: queue, pay, tunnel, vacuums

An express exterior car wash plan arranges four things in sequence: the stacking lanes that hold cars before the pay stations, the tunnel and its conveyor, the exit with its dryers, and the free vacuum field. Codes regulate the queue, the noise and the neighbors far more than the building, so the site is sized from the outside in.

A preliminary site plan from the studio draws all four at real dimensions and carries a site data table built for this use: acreage and zoning, tunnel length and rated throughput, stacking required against provided (with the code's per lane or per entrance wording), vacuum count, parking required against provided, setbacks, buffers, and the measured distance from the tunnel exit and vacuum field to the nearest residential line. That is the sheet a developer takes to a pre-application meeting, a lender or a contractor before the engineer of record builds the sealed set on it. The state by state regulations guide collects the state layer.

Tunnel length, throughput and land

Equipment makers publish the throughput that sets the program, and every figure in this section is a manufacturer or vendor rating, not a measured result. Sonny's published express layouts pair each tunnel length with a maximum hourly rating and a sample property ^{[7, 8, 9]}:

Other vendors rate their systems in the same range, in cars per hour (cph):

A conveyor at 1 ft/s works out to about 180 cph, but a vendor notes that "no express site actually sustains that" ^[16]. Plan the queue for the rating you underwrite, not the brochure peak.

California filings, used here as illustrations of what the program needs on the ground, are out-of-state examples for most readers: a Mister Car Wash in Santa Maria on 0.92 acres with a 5,381 sf tunnel building (staff report, Sept. 6, 2023) ^[17]; Blue Wave Express in Pittsburg on 1.36 acres with a 100-ft tunnel, three pay lanes and 22 vacuum stalls ^[18]; Davis Express on 1.74 acres with a 5,758 sf building and 21 vacuum bays ^[19]; and a Fresno project that pairs a 3,500 sq ft tunnel with a 16-stall vacuum area and a 21 ft parapet ^[20]. The vendor's Tommy Express prototype calls for 1+ acre and a 135 x 40 ft building on a 130 ft tunnel ^[21]. In Richardson, Texas, an express wash of about 5,000 sf with one tunnel and 20 outdoor vacuum bays was denied by the City Council on Oct 9, 2023, with noise, neighborhood opposition and water use cited, after the City Plan Commission had "narrowly approved the request by a 3-2 vote" (news report) ^[22].

Stacking lanes and pay station math

Stacking is usually the standard that sets the length of the site. Express and automatic counts in the codes run from 3 per service position in Tyler, Texas to 10 per lane in Tallmadge, Ohio and St. Charles, Illinois, and full-service washes in Pembroke Pines, Florida need 18 entrance spaces ^{[1, 2, 3, 23]}. St. George, Utah requires 5 spaces before the pay point and no queuing on the right of way ^[24]. Where a code sets no count, the test is performance: Frisco, Texas makes on-site circulation that holds all stacking one of its SUP conditions ^[25].

Three rules turn the count into a drawing:

• Linear queue equals spaces times space length. 10 spaces at 20 ft is 200 ft (St. Charles, Tallmadge); 8 spaces at Charlotte's 18 ft general size is 144 ft ^{[2, 3, 32]}.
• Per lane or per entrance. A code written per lane (Tallmadge) doubles the requirement when you add a second pay lane; a code written per entrance (Mayfield Heights) does not. In St. Charles, dual pay lanes each hold 12 to 13 cars before they merge after the pay station, 28 in total against a 10-space minimum, and the staff report projects 80 PM peak hour trips (40 in, 40 out) ^[3].
• Count exit spaces and vacuum parking separately. Pembroke Pines counts exit spaces on their own and requires 1 parking space per vacuum, separate from exit stacking ^[23].

In Mansfield, Texas, SUP finding (4) asks whether the driveways and parking are laid out so that cars and pedestrians move safely and conveniently without harming the public or neighboring sites (§155.080(F)(4)) ^[34]; the Mansfield model project shows how that finding shapes the queue.

Vacuum stall geometry

The vacuum producer is a noise source in its own right. Hillsborough County's EPC rule holds pumps and compressors to 55 dBA Leq, measured at least 40 ft across a residential property line ^[36]. A plan that puts the producer room and the vacuum canopies on the commercial frontage, behind the building from the nearest homes, avoids arguing how that rule classifies the equipment.

Water reclaim requirements

Of the state rules on record, only California sets a statewide reclaim floor. Water Code §10951 requires an in-bay or conveyor wash permitted and constructed after Jan 1, 2014 to recycle and reuse at least 60 percent of its wash and rinse water, or to take supplier recycled water for at least 60 percent; self-service wand washes are excluded, and §10953 leaves cities and counties free to require more ^{[4, 5]}. Elsewhere the rule is local.

In metro Atlanta the rule is close to regional: Hapeville's ordinance recites that the Metropolitan North Georgia Water Planning District "has mandated that all jurisdictions in the District's geographical area implement said model ordinance" ^[37]. The Atlanta metro page and the Georgia state page carry the local layer. Reclaim is real money on the pro forma: owners "have paid in excess of $100,000 for reclaim systems," per trade press ^[39], and a Minnesota Pollution Control Agency fact sheet puts recycling systems at $60,000 to $200,000 and plumbing modifications at $10,000 to $30,000 ^[40]. The plan reserves the reclaim tanks and equipment room; see also our post on water conservation in car wash design.

Wastewater pretreatment

The International Carwash Association's industry research reports that "Greater than 99 percent of professional car washes discharge effluent to a sanitary sewer" ^[41], so the local sewer use ordinance is the binding rule set. Expect device sizing with the plumbing plans, installation before the certificate of occupancy, and a pump-out schedule.

The preliminary plan locates the trap, separator and reclaim pit beside the tunnel; the engineer of record sizes them and designs the plumbing.

Dryer and vacuum noise

Few codes set car-wash-specific limits. Most apply the general property-line ordinance, so the operative document is the applicant's acoustic study, and the plan decides what that study can show: exit orientation, tunnel doors, wall heights and the distance to the nearest home.

Codes also regulate the layout directly. St. George requires tunnel sides facing residential to be fully enclosed ^[24]; Fort Worth provides that "No car wash dryer shall face a residential district or use" ^[57]; Tallmadge bans outdoor loudspeakers and menu board speakers ^[2]; Ogden orients tunnel and bay openings away from residential and bars operation from 8 p.m. to 8 a.m. in its C-1 zone ^[29]; Pembroke Pines bars a tunnel entrance or exit facing adjacent residential property ^[23]. Mitigation is measurable: in a Sherman Oaks (Los Angeles) study, VFD and plate features brought levels to 56 dBA at the entrance, a further 9 dBA reduction brought them to 47 dBA, and an 8 ft wall added about 4 dBA ^[52]. The drawing and the acoustic study must describe the same walls, doors and exit orientation.

Separation standards

The moratorium and cap wave, 2022 to 2026

Since 2023 the hardest constraint on new express washes has been saturation politics: moratoria, per-capita caps and spacing tests. The stated reasons repeat across the record: market saturation, queues spilling onto streets and pedestrian corridors, single-use buildings that are hard to reuse, codes with no use-specific standards and, in Mission, Texas, drought. Most rows below rest on news reports; the Avon and Warren rows rest on city documents.

Construction has slowed but not stopped: the International Carwash Association puts new construction at "estimated to exceed 500 units per year" ^[74]. Professional Carwashing & Detailing reported builds "topping out at around 850-900 new stores in 2023," with annual builds now closer to 550, plus or minus 100, and express washes "well into 90%" of new builds; industry counts differ on whether the peak came in 2022 or 2023 ^[75]. Builder estimates, which are partly marketing material, put an all-in Texas express tunnel at $3.0M to $7.0M, with equipment at $1.4M to $2.1M ^[76]. Our post The tunnel boom has peaked maps where the pipeline went.

Hearing records show what this means for a plan. In Mansfield, Texas, the Planning and Zoning Commission denied SUP25-004, a tunnel car wash at 1561 E Broad St, on Feb 19, 2026 ^[77]. The Hillsborough County model project and the Tampa metro page carry the Florida record.

State rules that reach the plan

Stacking, noise, separation and moratoria are set city by city. A handful of state rules still reach the plan:

The combo pages carry Texas car washes and Florida car washes in depth.

Approval paths

In Mansfield the SUP fee is $2,500 plus $100 per acre, with a $7,500 maximum (OR-2379-24) ^[85].

Which stages take an unsealed plan. Mansfield's SUP submittal requires a seal only on the metes and bounds description, which a registered surveyor signs and seals (§155.080(D)(3)) ^[34]. The St. Charles staff report reviews the project against plan policies "relevant to review of the Concept Plan," so that city runs a concept stage ^[3]. In unincorporated Hillsborough County the Planned Development general site plan is certified by the county, and staff have required the applicant to "Remove the notating 'For Concept Purposes Only' from the PD site plan" (PD 24-0676) ^[86], so the preliminary plan becomes a binding exhibit and is drawn at final dimensions. Where a jurisdiction requires sealed civil and building sets, the preliminary plan is what the engineer of record builds them on. The preliminary versus final site plan guide sets out the split.

What the engineer of record adds

Renderings for the hearing

Boards that hear car washes ask for pictures of the queue and the neighbors' view. In Colonie, New York, a planning board asked for vacuum and mechanical sound data, stacking on the plan, turning templates, lower light poles with down-lighting, non-white fencing and street landscaping, and required elevations and renderings on resubmission ^[87]. Mansfield's SUP plan must include architectural renderings or elevations with all exterior materials labeled (§155.080(D)(8)(l)(2)) ^[34]. The car wash rendering page sets out the view set tied to the site plan.

State, metro and sibling pages

• Texas: the Texas car wash page, the Mansfield model project and the Texas gas station page.
• Florida: the Florida car wash page, the Hillsborough County model project and the Tampa metro page.
• Georgia: the Georgia gas station page and the Gwinnett County gas station model project.
• Fuel on the same pad: the gas station site plan hub, the truck stop site plan hub and the Waller County truck stop model project.
• Market context: car wash development in 2026.