Accessory Dwelling Units

The construction of an Accessory Dwelling Unit (ADU) involves several key steps, and the specific process can vary based on local regulations and zoning requirements. However, here’s a general guide to the ADU construction process

Research Local Regulations

Understand local zoning regulations, building codes, and permit requirements related to ADUs in your area. Some locations may have specific guidelines regarding ADU size, setbacks, and parking.

Consult with Local Authorities

Schedule meetings or consult with local planning departments to discuss your plans and confirm compliance with zoning regulations. Obtain information on required permits and fees.

Design and Planning

Collaborate with an architect or designer to create detailed plans for your ADU. Consider factors such as size, layout, and the intended use of the space. Ensure the design complies with local building codes.


Obtain the necessary permits for the ADU construction. This may include building permits, planning permits, and potentially other approvals, depending on local requirements.

Site Preparation

Clear the site where the ADU will be constructed. This may involve removing any existing structures or preparing the area for construction.

Foundation and Framing

Construct the foundation for the ADU, whether it's a slab, crawl space, or other types. Once the foundation is in place, proceed with framing the structure.

Utilities and Infrastructure

Connect or extend utilities such as water, sewer, and electricity to the ADU. Ensure that all connections meet safety and building code standards.

Construction of Shell

Build the structural elements of the ADU, including walls, roof, and exterior finishes. Install doors and windows, ensuring proper insulation and weatherproofing.


Interior Construction

Complete the interior construction, including insulation, drywall, flooring, and interior finishes. Install plumbing, electrical wiring, and HVAC systems as needed.

Fixtures and Appliances

Install fixtures and appliances in the ADU, such as a bathroom, kitchen, and any other necessary amenities. Ensure all installations meet building code requirements.

Final Inspections

Schedule final inspections with local building authorities to ensure compliance with all regulations and safety standards.

Landscaping and Exterior Features

Complete landscaping around the ADU and add any exterior features, such as walkways or outdoor spaces.

Certificate of Occupancy

Once all inspections are passed, and the ADU is deemed compliant, obtain a Certificate of Occupancy from local authorities. This certifies that the structure is safe and suitable for occupancy.

Client Walkthrough and Handover

Conduct a final walkthrough with the property owner to ensure satisfaction. Provide relevant documentation, such as warranties and maintenance instructions.

The ADU construction process requires careful adherence to local regulations and effective coordination among architects, contractors, and local authorities. Consulting with professionals experienced in ADU construction is recommended to navigate the process smoothly.