We do everything in house one mechanic employed full time, but we do not advertise to the retail market we only work for the trade, lots of reasons but in the end this route worked out to save us a fortune we zero headaches.
quick example, Phone rings hello Mr Jones how can i help you, hi you fitted new brake pads for me last months and now i have an eml light on, aw ok bring it down and we will have a look, Mr Jones your 02 sensor has failed, well no way i am paying for that it was fine until you touched my brakes !!!!.......good bye retail customers.
The work he does on the trade cars doesnt bring in a fortune but pays his wage and then all the work completed on our stock is labor free with enough left over to buy a few pizza's.