We work very hard in estimating a project so that we include all potentially hidden costs. We work closely with the architect to clarify any questions in the plans, and can often offer suggestions for savings to the homeowner. We verify our estimate against previous completed projects whenever possible. Other than real 'unknowns' such as well-drilling costs, buried rock at the site, or renovations revealing significant problems hidden in the walls, we have confidence that our estimates fully cover all costs.