I think this could be a great partnership for both businesses. My suggestion would be to create a separate post-construction cleaning package with pricing based on the size of the property and the level of cleaning required. This way, the remodeling company can include your services in its project estimates, while you get a consistent source of new clients. I would also recommend agreeing on responsibilities, pricing, and payment terms upfront to avoid misunderstandings. Start with a few projects, evaluate the time and costs involved, and adjust your rates accordingly. A win win partnership is all about making sure both businesses remain profitable.