The applicant should provide an estimate of the value of owner or volunteer labor. Project Name: Street Address: Cost Breakdown: • Do not include any mechanical, plumbing or electrical (M.All documents to include the application, plans, license, calculations, or other supporting information must be in a PDF format and be separate attachments. Discover the cost to build a house in Fairfax, VA factors, prices, and insights. Plan your dream home with accurate estimates.