Since Interiors have so many variables your bids can vary greatly for what appears to be no real sensible reason. However, there are 2 main reasons for this, prevalent Poor Estimating Skills (Guestimating) with especially Franchise type outfits and paying a group of Painters a “Whatever” type of amount of money to do the job no matter how long it will take to complete. It is essential that your Contractor can explain exactly how he ascertained a bid number for you and what the estimated materials will be on the Project. This will help you avoid having unhappy or rushed Painters on your Job where the experience and the End Result will be in question. Don’t forget to Verify Insurance for an active Workers Comp and Liability Policy as many Contractors will let the Insurance expire in Winter Months. Finally make sure your Contractor is registered with the Secretary of State with a Certificate of Good Standing on File.