i have done intermittent insurance work.
a potential customer will phone me saying they have a some tiles blown off, or the bath overflowed and the ceiling is down, or the mower went through the patio doors or whatever.
if the customer wants you specifically to do the job, then you need a colleague in the trade who can provide an alternative more expensive quote. this does not guarantee you get the job but it helps.
the customer may even ask you to load the quote to deal with the excess which they have to pay.
once the job is complete, the insurance will either pay the money direct to you or send it to the policy holder, who then pay you.