If say, it's a 1,000 sq M @ say £ 1.50.
If you turn up with five helpers and knock it off in a few hours, why should the client worry about the job cost compared to one man taking a few days.
Playing devils advocate here from a commercial customers point of view.
5 helpers x 4 hours @ £10/hr
The main guy with the skills/knowledge etc 4 hours @ £50
Total value in the customers eyes for cleaning = £400 but probably figure in tax, insurance, paye, fuel, chemicals etc and he wouldn't argue with £700
That's the bottom line, depending how well it is sold at quote stage and explaing time issues because all the kit has to be taken up 4 floors would get it a bit higher.
Like I said this is not my view but what I expect the customer to think about cleaning.
We do a bit of contract cleaning and you'd be surprised how many jobs we lose to £7.50/hour crews. And this is what the commercial customer thinks is acceptable for cleaning?