ADU Builder in El Dorado Hills, CA

El Dorado Hills combines view lots, newer estates, and room to build — ideal conditions for a detached second dwelling that matches the quality of the main home. Golden Valley Development is a family-owned, licensed design-build contractor based in Loomis, and we bring the same one-team process to El Dorado Hills ADU projects: design, engineering, permits, and construction, start to finish.

What we build in El Dorado Hills

Detached ADUs up to 1,200 sq ft — a guest house, in-law residence, rental unit, or purpose-built leisure space (golf simulator, theater, gym) engineered around the activity, with finishes matched to communities like Serrano and the surrounding hills.

Attached ADUs — an architecturally matched addition sharing a wall and utilities with your home.

Garage conversions and JADUs — turn existing square footage into legal, permitted living space.

El Dorado Hills permitting — through El Dorado County

El Dorado Hills is unincorporated, so ADU projects run through El Dorado County’s planning and building departments — different from the city processes in Folsom or Roseville next door. We handle site planning, structural engineering, Title 24 energy compliance, and county permitting in-house, and our site assessment flags hillside, grading, and utility-run cost drivers common on EDH lots before you commit to anything.

What an El Dorado Hills ADU costs

Most of our custom ADUs land between $150,000 and $400,000 depending on type, size, and site conditions — sloped view lots can add sitework. Our 2026 ADU cost guide breaks down ranges by type, and a free site assessment gets you a real number for your parcel.

One team, from 3D design to keys

Family-owned, CSLB licensed (#1030793) and insured. See your ADU in 3D before we break ground — with $1,000 off design right now.

Get your free El Dorado Hills site assessment → or call (916) 671-0802.

Also serving Folsom, Granite Bay, Roseville, Rocklin, Loomis, and greater Placer County.