Check for membership RBP (REGISTERED BUILDING PRACTITIONER)every re stumping buisness must hold this this registration and be financially registered
Ask how many years he or his workers have been in this industry (because some companies hire anyone to do your job without experience and experience counts)
Price: A cheap price doesn't mean you will get a quality job.I.E: levelling and straightness of stumps and quality workmanship
Ask whether a permit will be given .This is a must for resale purposes.
Ask if there are any hidden extra's in price,(as many quotes aren't what they seem in final payments)
Ask if treated pine cleats are an extra or included in price
Ask to see examples of work
Ask for references and contact at least one to confirm
Ask who will actually be re stumping or underpinning your house – will the be at least one fully qualified tradesperson onsite at all times?
EXTRA USEFUL LINK THAT MAYBE OF HELP