The city compiles a master list of registered contractors who work within the city. You can download the list here.
Note: The city does NOT endorse or recommend these contractors. This is just a list of who has registered. So again, these are not recommendations. As always, buyer beware when choosing a business to hire. The best advice is to ask your neighbors and friends in the area who they have used and get positive referrals before ever signing on with a contractor.