OneStop ADU

OneStop ADU is a turnkey ADU design and construction company serving homeowners and property investors throughout San Diego County. Based in San Diego, the company provides a streamlined approach to building accessory dwelling units, combining feasibility studies, pre-designed plans, permitting, financing assistance, construction, and optional property management. Its in-house licensed building team has more than 25 years of experience constructing homes and multifamily projects in the San Diego area.

An accessory dwelling unit (ADU) — also referred to as a granny flat, casita, backyard home, guest house, or secondary dwelling unit — is an additional independent living space located on the same property as a primary residence. OneStop ADU focuses on traditionally built ADUs rather than prefabricated units.

ADU Services

1. Pre-Designed ADU Plans: OneStop ADU offers six pre-designed floor plans ranging from a 400-square-foot studio to a 1,200-square-foot four-bedroom, two-bathroom unit. Using pre-designed plans can reduce the time and complexity associated with starting an ADU design from scratch.
2. Multiple Exterior Styles: Homeowners can choose from three architectural styles — Contemporary, Craftsman, and Spanish/Mediterranean — with curated interior and exterior finish selections.
3. ADU Feasibility Studies: Before beginning a project, the company conducts a basic feasibility study to review local and state regulations, allowable ADU sizes, and potential placement on the property.
4. ADU Design & Construction Drawings: Construction pricing includes architectural plans, structural plans, and Title 24 documentation for its pre-designed ADU options.
5. Permitting: OneStop ADU manages the permit-processing process and works to simplify approvals for homeowners. The company also highlights pre-approved ADU plan programs in several San Diego County cities.
6. Traditional ADU Construction: The company’s in-house licensed building team constructs ADUs using conventional site-built construction methods rather than delivering prefab units.

What OneStop ADU Offers Beyond Construction

OneStop ADU positions itself as a comprehensive one-stop solution for ADU development. In addition to planning and construction, the company assists clients with several aspects of the development process, including:

• Initial feasibility studies
• Architectural and structural plans
• Title 24 documentation
• Permit processing
• Electrical upgrades
• Required solar installation
• Project management
• Lender matching and financing coordination
• Optional property management for rental ADUs

For homeowners planning to rent their ADU, OneStop ADU also offers access to property management services through its affiliated company, Onyx Property Management.

Pre-Approved ADU Plans

OneStop ADU also works with pre-approved ADU plan programs in several San Diego County communities. Its website identifies programs or partnerships involving:

• San Marcos
• Escondido
• La Mesa
• El Cajon
• Imperial Beach
• Carlsbad

These programs can potentially reduce paperwork and shorten portions of the approval process for qualifying projects.