Building a house is a complicated process that involves knowledge of architectural design, building codes, zoning regulations and basic construction elements. A residential building contractor oversees the construction of individual houses and multi-unit housing projects. A commercial building contractor oversees the The contractor has indicated that there is just one last item to take care of…signing the construction contract. Before you sign, it is imperative that you review and understand the contract. The contractor won’t tell you this, but you may also wish to (and you have the right to) negotiate certain contract terms. Construction contractors, often known as construction managers, plan and supervise a variety of construction projects, such as residential buildings, commercial construction, or public works projects.