San Fernando is its own 2.4-square-mile city inside the Valley — 1920s bungalows and Spanish cottages near downtown, postwar stuccos toward the edges, and multigenerational households on almost every block. It's also our home turf: Guillen Construction is based right here at the Mission Hills line, so a walkthrough usually happens within days.
San Fernando runs its own ADU process — smaller counter, faster conversations — and its lots were made for this: alley garages behind 1920s bungalows and postwar homes with room in back. Most of what we build here is family housing: a permitted unit for parents or a newlywed kid, built so it can earn rent later.
We're based in Mission Hills, so San Fernando is home turf — walkthroughs usually happen within a couple of days.
ZIP codes: 91340 · Serving all of San Fernando and the surrounding San Fernando Valley.
A complete small home in your backyard — foundation, framing, systems, and finishes, up to 1,200 sq ft under state law.
The fastest, most affordable path to a rentable unit: foundation checks, insulation, systems, and a finish that doesn't feel like a garage.
Additions and junior units carved from existing space, with the required separate entrance and kitchen done to code.
Not every backyard building needs a full kitchen — we build casitas, studios, and offices to the same standard.
Trenching, sewer connections, panel upgrades, and meters — the part of ADU budgets everyone forgets. We price it up front.
Architectural plans, structural engineering, Title 24, and city plan check — or we build from the plans you already have.
Typical 2026 Los Angeles-area ranges including construction; plans, permits, and utility fees vary by city and site. Many owners see the unit pay for itself in 7–12 years of rent.
Permits here go through the City of San Fernando's own Community Development Department on First Street — a small, independent city hall we work with constantly, since our shop is minutes away. We prepare the plans, pull the permits, and meet the inspectors — you never stand in a city line.
Turnkey garage conversions typically run $100k–$180k and detached new-build ADUs $250k–$400k+ — San Fernando sits squarely in those ranges. Utilities and site conditions move the number, which is why we start with a free site check and give you a written, line-item price.
We're based in Mission Hills, so San Fernando is home turf — walkthroughs usually happen within a couple of days. Estimates are free and come back as a written, line-item scope — not a guess over the phone.
Free on-site estimates. Straight answers on price, permits, and timeline — no runaround.
We reply within one business day — usually faster.