ResCom ADU, LLC

ResCom ADU is a residential and commercial ADU builder based in Walnut Creek, California, providing an end-to-end approach to accessory dwelling unit projects. The company handles permits, design, engineering, construction, and utility hookups, allowing homeowners to work with one team from initial planning through completion. ResCom says its management team brings more than 100 years of combined experience in construction, real estate, sales, management, and financing.

An accessory dwelling unit — also referred to as a granny flat, in-law suite, backyard cottage, or secondary dwelling unit — is an additional independent living space located on the same property as a primary residence. ResCom ADU offers a range of ADU models and custom design options intended for extended-family living, home offices, studios, gyms, or rental income.

What ResCom ADU Offers Beyond Construction

ResCom ADU provides a turnkey ADU process, handling the major stages required to take an ADU from concept to a completed, usable unit. Its services include permitting, architectural design, engineering, construction, and utility hookups.

The company offers pre-approved ADU plans in addition to customized designs. According to ResCom, using pre-approved plans can help save time and money while expediting the permitting process. Its published models start at 640 square feet, with smaller options also available.

ResCom’s current portfolio includes multiple standardized models. For example, Model 1 is a two-bedroom, one-bathroom design measuring approximately 675 square feet, while other models provide one-bedroom or studio-style layouts. The company lists starting prices of $100,000 for its published models, although actual project costs will depend on the property and scope of work.

A notable aspect of ResCom’s construction approach is its use of Structural Insulated Panels (SIPs). The company’s SIP system combines an EPS insulation core with oriented strand board skins and incorporates framing, insulation, electrical conduits, and sheathing into a single building component. ResCom promotes the system for energy efficiency, reduced construction waste, faster installation, and improved thermal performance.

The company also incorporates Net-Zero Construction Technology, which it says can reduce heating and cooling costs. Its ADU designs are available in architectural styles including Mediterranean, Contemporary, and Craftsman.