American Helical: A Full-Service ADU Contractor in California
For homeowners looking to build an accessory dwelling unit (ADU) — whether for rental income or to expand family living space — American Helical operates as a general contractor offering an end-to-end solution, from initial consultation through to project completion. Licensed under CA LIC #1128975, they handle the full process of planning, design, permitting, and construction.
Working with a licensed ADU contractor is strongly advised, and American Helical integrates architectural designers throughout the entire process to help keep things efficient and organized from the start.
The Four-Step Process for Building an ADU
1. Planning
The process begins with a free consultation and estimate. This initial step is designed to help homeowners make informed decisions about building an ADU within their budget, timeline, and specific needs. American Helical includes architectural designers from this early stage to ensure the planning phase runs smoothly.
2. ADU Design
American Helical offers several design paths for homeowners:
- Pre-designed ADU models developed with an architectural designer
- Pre-approved ADU plans available across multiple California counties
- Custom ADU concepts built from scratch
- Prefabricated unit installation
Regardless of the design approach, site-specific considerations are incorporated to support the permitting and inspection process. As one example, Stanislaus County — in partnership with the cities of Ceres, Modesto, Oakdale, Riverbank, Turlock, and Waterford — offers seven different ADU plans for detached new construction, each with multiple exterior finish options, available free to property owners.
American Helical currently offers five pre-designed ADU models created by architectural designers, ranging in size and layout:
- 1 Bed / 1 Bath — 520 sq. ft.
- 1 Bed / 1 Bath — 560 sq. ft.
- 1 Bed / 1 Bath — 565 sq. ft.
- 1 Bed / 1 Bath — 635 sq. ft.
- 2 Bed / 1 Bath — 749 sq. ft.
These pre-designs take key permitting requirements into account and can serve as a starting point for planning discussions.
3. ADU Permitting
Once a design is finalized, American Helical manages the permit application process through the relevant local city or county review. Local municipalities have specific requirements that must be met. For example, the City of Modesto requires a complete permit submittal package that includes a full set of plans, energy calculations, truss calculations, and structural calculations. American Helical is familiar with these local requirements and guides homeowners through the process accordingly.
4. Construction
After permits are approved, American Helical's full-time crew begins construction. As a 3rd-generation builder and general contractor, they bring experience across all stages of the build. Inspections are required at multiple points during ADU construction, and their team is accustomed to meeting the quality and precision standards that home inspectors require for approval at each stage.
Serving Homeowners Across California
American Helical works with homeowners across multiple California counties, offering pre-approved ADU plans suited to various local jurisdictions. Their approach as an accessory dwelling unit builder is structured to reduce the complexity that often comes with ADU projects — coordinating design, permitting, and construction under one contractor rather than requiring homeowners to manage multiple separate parties.
For those considering a detached ADU, a backyard cottage, or a granny flat, American Helical provides a structured process intended to take a project from concept to a completed, permitted dwelling unit.