Detached ADUs
A stand-alone backyard cottage, designed to match the main house — like it was always there.
Accessory Dwelling Units
The ADU builder for Placer County backyards
A rental unit, a place for parents, a home office that's actually a home — ALC builds detached ADUs, attached units, and garage conversions from first sketch to final inspection.
ALC Building & Renovations is an ADU builder serving Lincoln, Rocklin, Roseville, Loomis, and greater Placer County. California law now makes an accessory dwelling unit possible on most single-family lots — but between site checks, plans, city review, and inspections, the paperwork is half the project. We handle all of it as your general contractor, and owner Alejandro Tomas is on site for every build.
Larger lots in Loomis and established neighborhoods in Roseville are especially strong ADU candidates, and every estimate starts with a free walk of your actual yard.
What We Build
What's included
Garage conversions
The fastest path to a legal second unit: your existing footprint, rebuilt as a real home.
Attached ADUs & JADUs
Additions with their own entrance, or junior units carved from space you already own.
Straight Answers
What building an ADU really depends on
People ask what an ADU costs, and the honest answer is: it depends on your parcel. These are the factors that move the number — and why every ALC estimate starts on site, free, and ends in writing.
- Utility connections. Distance to sewer, water, and panel capacity often matter more than square footage.
- Site access and grading. A flat backyard with side access builds cheaper than a tight, sloped one.
- Size and finish level. A studio conversion and a two-bedroom detached unit are different projects.
- Your city's rules. Setbacks, height, and parking requirements vary between Lincoln, Rocklin, Roseville, Loomis, and unincorporated Placer County — we confirm your parcel's rules before you spend a dollar.
FAQ
Common questions
Do you handle ADU permits in Placer County?
Yes. Whether your lot answers to the City of Lincoln, Rocklin, Roseville, the Town of Loomis, or Placer County, ALC prepares the plans and handles submittal, corrections, and inspections as part of the build.
How long does it take to build an ADU?
A garage conversion typically moves faster than a detached unit, and permit review time varies by city. At your free estimate we map a realistic timeline for your specific lot — and the schedule goes in writing.
Is building an ADU worth it?
For many Placer County homeowners, yes — as rental income, family housing, or long-term property value. It depends on your lot and goals, which is exactly what the free on-site walkthrough is for.
Can you match the ADU to my existing house?
That's the standard we build to. Siding, rooflines, windows, and trim are designed so the ADU reads as original to the property, not bolted on.
Tell us about your project
Free on-site estimate, written pricing, and the owner on every job.