Could depend on how many hours are involved in the contract? The more hours, the more competative you can be with your pricing i.e If you pay your staff £6 per hour, charge £10, 100 hour a week contract, Nice Profit! Dont forget you will have to work in a Minimum of 20 days holiday pay for each operative per year. Will you supply materials/equipment? Would staff require training? Plus Your time as most clients would require monthly audits.