A residential design-build project for a home addition follows a structured sequence of phases to ensure structural integrity and compliance with local regulations. The process typically includes the following stages:

1. Zoning Research and Site Evaluation: This initial phase involves investigating local zoning codes (such as height limits and setback requirements) and assessing the property’s soil conditions to determine the feasibility of the project.
2. Design Development: Homeowners work with professionals to create architectural and engineering plans. This includes deciding between building up (adding a story) or building out (expanding the footprint) and selecting materials and finishes.
3. Permit Acquisition: Detailed plans, including stamped structural drawings from a licensed professional engineer, are submitted to the local building department (such as the City and County of Denver) for review and approval.
4. Foundation Work: Once permits are secured, the physical construction begins with site excavation and the installation of foundation systems tailored to the soil, such as helical piers or concrete footings.
5. Framing and Structure: The skeletal structure of the addition is built using lumber or steel according to the engineered designs.
6. Mechanical Rough-ins: This phase involves the installation of plumbing, electrical, and HVAC systems before walls are closed.
7. Interior and Exterior Finishes: This includes insulation, drywall, flooring, cabinetry, and exterior siding or landscaping.
8. Final Completion and Inspection: The project concludes with a final walkthrough and mandatory city inspections to verify that the work meets all safety standards and building codes.

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