For homeowners looking to maximize their property’s potential, Accessory Dwelling Units (ADUs) and Detached Accessory Dwelling Units (DADUs) offer versatile solutions. Whether for additional rental income, guest accommodations, or a dedicated workspace, selecting the right option depends on various factors, including zoning regulations, cost, and intended use.
Understanding the Differences
- ADU (Accessory Dwelling Unit): ADUs can be attached or detached. An attached ADU (AADU) is within or attached to the main residence, such as a basement apartment or addition approved as a separate dwelling.
- DADU (Detached Accessory Dwelling Unit): A dwelling in a separate building on the same property as the main home, such as a backyard cottage, with its own living facilities and entrance. Utility connections and metering depend on the approved design and provider requirements.
Zoning and Permitting Requirements
Start with the city or county responsible for permits at your address. Check current zoning, allowable unit count, size, height, setbacks, parking, utilities and site conditions before choosing an attached ADU or backyard cottage. Permit timing depends on the review path, project complexity, application completeness and any corrections or resubmittals. Confirm the expected process with the permitting authority before setting a construction start date.
Cost and Project Timeline
- ADUs: Attached ADUs: $250-$350 per sq ft. Includes site work, utilities and contingency. Excludes design/engineering plans and permit costs; sales tax is extra. Garage and basement conversions require separate quotes.
- DADUs: Preliminary planning figures are $300–$450 per sq ft, including site work, utilities and contingency. Design/engineering plans and permit costs are excluded; sales tax is extra. Final scope, finishes and unusual site conditions are confirmed in the written project estimate.
- Construction Duration: Approximately 3 to 5 months after permit approval. Design and permitting are separate.
Determining the Right Choice
- Rental Income: DADUs provide privacy, making them ideal for long-term tenants.
- Guest Accommodations: ADUs offer convenience while keeping guests close to the main home.
- Home Office or Studio: A DADU ensures a quiet, separate workspace.
- Multigenerational Living: ADUs allow family members to reside nearby while maintaining independence.
Why Choose NBE LLC?
At NBE LLC, we specialize in navigating the permitting process, ensuring high-quality construction, and delivering seamless project management. Our expertise helps homeowners maximize their investment while creating functional and aesthetically pleasing living spaces. Contact us today to discuss your ADU or DADU project.
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