Every custom kitchen renovation is unique to you and your home, and upon completion of a design phase, you’ll need a detailed construction proposal with your exact project costs. But before embarking on a design phase, clients need to know potential cost ranges for their project as a baseline feasibility for taking on the work in designing the space. Cost ranges are primarily based on two key components: 1) Construction and Installation Costs and 2) Customer Purchases: Fixtures, Appliances and Finishes.