Accessory Dwelling Unit (ADU) Construction

Accessory Dwelling Units have become one of the fastest-growing segments of Oregon's housing market, driven by landmark legislation like House Bill 2001 that requires cities to allow ADUs on most residential lots. 3-A Construction, LLC is at the forefront of this movement, helping homeowners across Oregon add manufactured ADUs to their properties for rental income, family housing, aging-in-place solutions, and property value enhancement.

A manufactured ADU offers significant advantages over a site-built accessory dwelling. Factory construction means shorter timelines, lower costs, and consistent quality, while still meeting all Oregon building codes. We install single-section manufactured homes as ADUs on urban and suburban lots, handling everything from site evaluation and permitting through foundation construction, utility connections, and final inspection.

Navigating ADU regulations can be confusing, as requirements vary between jurisdictions even under Oregon's statewide framework. We understand the specific ADU rules for cities and counties throughout Oregon, including maximum size limits, setback requirements, parking provisions, owner-occupancy rules, and design standards. Our team manages the entire permitting process and prepares all required documentation including site plans, utility plans, and engineering drawings.

Site preparation for an ADU requires careful planning, especially on lots with existing homes and utilities. We evaluate access routes for home delivery, identify utility connection points for water, sewer, and electrical, and design the site layout to maximize the use of available space while meeting all setback requirements. Our excavation crews are experienced at working on tighter lots where precision is essential.

Whether you are a homeowner looking to add rental income, a family wanting to keep aging parents close, or an investor building housing supply, an ADU makes financial and practical sense. With 3-A Construction, LLC, you get a single contractor who handles every phase of the project — no need to coordinate between builders, plumbers, electricians, and permit consultants. One Call. One Crew. Start to Finish Done Right.