John,
Consider what is possible from what is available. Here is a quick and dirty analysis.
All washes require some level of attention so there is no such thing as a truly unattended carwash.
Assume an owner’s average time to cover basic duties and responsibilities for a self-service is say between 25 and 30 hours a week. This is regardless of whether you pay yourself or not.
If you add a part-timer for 20 hours a week at $8.00 to help lighten the load, and this person was not involved in any activities that generate additional sales, all you have done is create labor cost of $640 per month plus any payroll expense.
In this case, I not involve this person in the in-bay production process. Instead, use attendant to educate customers on the
loyalty/card club program (increase sales per customer), demonstrate how to use the equipment, hand out brochures to explain benefits of in-bay’s total body protection or tire shine program (these are profit centers requiring no labor).
If you want to add labor to in-bay production process, you would want to make a profit from doing so. 40 hours at $8.00 is $1,280 a month plus payroll expense.
Let’s assume you can add on two services. One requires labor. The labor service generates additional sales of $4.00. Typically 25 percent of customers would buy this. The other involves a
loyalty program (accepting prepaid sales and coupons/warrants). This increases
loyalty from 10 percent to 15 percent or a 15% increase in base sales.
Let’s assume your base is 15,600 cars washed per year or 50 cars per day. This would equal design hour of roughly 12 cars an hour or requiring one in-bay with average cycle time of 5-minutes. Say, 15,600 times average sale of $6.00 equals $93,600 gross.
25% average extra sales would yield $1,300 a month less labor $1,280 leaves profit of $20.
If you add on the $1,170 generated from implementing
loyalty program brings earnings up by $2,470 ($1,300 + $1,170) less labor of $1,280 leaves profit of $1,190.
If you didn’t want to do
loyalty program, then you would need to do double the volume in $4.00 service, meaning you would need to almost double the sales rate (very difficult) or the in-bay capacity.
The real payoff from adding the additional labor would come from buy a faster machine.