This Cost Estimating Guide (Guide) sets out a consistent framework for estimating capital project and program costs at the conceptual and detailed levels. Permit Application Forms:.The Construction phase typically takes 6-12 months. Most ADU projects take 12-18 months to complete, but some extend to 24 months or more. Simplify your construction services with our user-friendly template! Easily document project details, client requirements, and estimates. Contact Us: City Hall Address: 2263 Santa Clara Avenue Alameda, CA 94501 (510) 747-7400