I gave up trying to price per circuit commercial/industrial testing and quoted a day rate with an estimated duration. We agreed we would do a full initial inspection and test fixing faults and defects that were practicable during the course of the inspection. If they could give us of one of their maintenance staff with building knowledge, authority and a full set of keys it would be much quicker and cheaper. The maintenance guys were usually happy to take notes, foot ladders, carry gear, bring tea and run round telling people to shut down computers and machines. They would know the building layout and things like 'Production Room 3' was now 'Accounts', and 'There is no key for the lift room - just push the door really hard - it swells up when it rains' . Because our time was costing the client money, we would be given priority, immediate answers to our questions, van parking in the loading bay and generally treated like royalty. We could tell them that because we were 100% confident with all the initial test results we could start a rolling system of sample testing for subsequent years saving ÂŁ100s. We would end up doing all the remedial work and new installation work too, with the same level of co-operation. We had several clients each providing between 10 and 20 man weeks work per year at any one time. We had to build their trust, we could have ripped them off but we didn't, and we didn't feel that we were being ripped off either. It worked for both sides really well. This rarely happened when working on a price-per-circuit basis.