Contracts and one-off jobs are two businesses with two buyers. The office manager wants a monthly price per square metre; the tenant wants a fixed price by Friday — and the same page serves neither well.
Frequency and scope are the questions behind every enquiry: how often, what is included, who supplies the materials. Answering them turns a quote request into a comparable offer.
This is bought on trust because nobody supervises the work. Naming the staff who attend, saying whether they are employed or subcontracted, and publishing insurance details wins the contracts that price alone does not.