Get recommendations and references. Talk to friends, family and others who have used contractor services for similar work.
Get at least three quotes in writing. Insist that contractors visit your home to evaluate what needs to be done.
Check the history of complaints against the contractor. You can get this information from the consumer affairs office (DACO).
Get the names of the suppliers and find out if the contractor makes the payments on time.
Confirm that the contractor is insured. This must have a civil liability insurance, a material damage insurance and a compensation insurance for work accidents for their …