The cost to build can vary considerably.
On high end, some developers have spent, reportedly, upwards of $4.0 million to build an express wash (1 acre and up). The average cost is between $2.0 and $2.5 million (2/3 to 3/4 acre). The low end is roughly $1.0 million for a mini-tunnel (less than 1/2 acre).
For example, I have several clients with small-scale washes on property measuring between 8,000 SF and 15,000 SF.
To put this into perspective, assume you plan a 2,700 SF 8-bay self-service facility on 1/2 acre of land for $1.0 million. It’s a location and you anticipate 50,000 visitors per year and average sales of $5.00 or gross $250,000.
Next, plan a 1,500 SF mini-tunnel on 1/4 acre for $1.2 million. Assume only 30,000 visitors per year but average sales of $7.50 or gross $225,000.
Here, difference in average sales is not economic theory (price elasticity) but value-added. Mini-tunnel cleans, shines and protects in 4-minutes, automatically (no work), little waiting plus free vacuums.
Now, compare business models (cost accounting).
Self-service = $250,000 / 2,700 = $93 / SF building
Mini-tunnel = $225,000 / 1,500 = $150 / SF building
$93 is the rate (unadjusted) at which self-service (plant) generates money through sales.
$150 - $93 / $93 = 0.61 or 61%
This means for every $1.00 in sales self-service generates mini-tunnel generates $1.61.
Most of my clients with mini-tunnel have average sales of $10.00 or $200 / SF building.
$200 - $93 / $93 = 1.15 or 115%
This means for every $1.00 in sales self-service generates mini-tunnel generates $2.15.
An alternative to mini-tunnel would be to plan a dual in-bay automatic.
If you follow the same procedure I described above, you could evaluate “self-service versus dual in-bay” and “dual in-bay versus mini-tunnel.”
Hope this helps.