Your contract should state that the contractor will use drop cloths or other coverings to keep the paint from spilling and getting all over your precious items. If the painting will be outside, how will they protect your shrubs and lawns? What will they do if paint ends up on your windows, and how do they plan to clean up the site? Stipulate that the contractor returns everything to pre-work conditions, especially if you're talking about the landscaping. House Painting