Help a tradesperson understand your job before they visit. Describe the problem, where it is happening and when you would like the work completed.
A useful enquiry includes
The type of work, your location, photographs where relevant, access arrangements and your preferred dates. Ask for a written breakdown of labour, materials and any other charges.
Compare like for like
A price only makes sense alongside the scope. Check whether each quote covers the same work and discuss questions before accepting it.