Accessory
dwelling units
More usable space on the lot you already own, built by one company from the excavation to the door hardware. Detached units, garage conversions, additions, and junior units across Sonoma County.
Sebastopol, California Building since 1999 CSLB 740895 Planning, permitting, construction, final inspections
What it covers
What an ADU is
Room for a parent, an adult kid, a guest, a shop, or a tenant. The building barely changes. The lot does.
Where the unit can sit. How far the sewer and panel have to run. Whether a concrete truck can reach it. Those answers set the cost before anyone draws anything.
We walk the property and tell you. No charge.
Detached timber buildingCiddio photograph
Its own house in the yard. The most freedom in the layout, and the most site work.
- Yard
- Built on
- Foundation
- New
- Utilities
- New run from the house
A finished room, emptyCiddio photograph
Slab and shell already there. The work is floor, insulation, windows, systems.
- Yard
- Untouched
- Foundation
- Existing slab
- Utilities
- New systems in an existing shell
Framing a new wallCiddio photograph
Shares a wall with the house. Shorter utility runs. Roof and siding have to match.
- Yard
- Partly built on
- Foundation
- New, tied to the house
- Utilities
- Short runs from the house
Compact kitchen runCiddio photograph
A room inside the existing walls, made independent. The yard is untouched.
- Yard
- Untouched
- Foundation
- Existing
- Utilities
- Inside the existing walls
What is included
The full scope of an ADU build
One contract, one company answering for it. No hiring a framer, then chasing a cabinet shop, then trying to get an inspector out.
Site and structure
- Site prep and excavation
- Foundations and concrete
- Structural framing
- Utility trenching and connections
- Drainage and grading
Shell and systems
- Roofing and exterior finishes
- Windows, exterior doors, and weatherproofing
- Insulation and drywall
- Electrical, plumbing, and HVAC coordination
- Energy compliance items
Interior and finish
- Kitchen and bathroom build
- Cabinetry built in our shop
- Flooring, trim, and interior doors
- Railings and metalwork where needed
- Hardware and final fit
Permits and paperwork
- Project planning and permitting
- Working with your architect or designer
- Construction management
- Inspection scheduling
- Final inspections and sign-off
A finished interiorCiddio photograph
Electrical, plumbing, and HVAC are coordinated as part of the build and performed by licensed trade contractors, scheduled and held to the project timeline, so you are not managing separate companies yourself.
FAQ
Common questions about ADUs
Will my lot even work for an ADU?
That is the first thing we find out, and it costs you nothing. Some lots make an ADU easy and some make it expensive. You should know which one you have before you pay anyone for drawings.
What will it cost?
Not something anyone can answer honestly over the phone. The same unit costs very different amounts depending on the foundation, the utility runs, and the access. We walk the property, then price the real job, and tell you which parts of your lot are the expensive ones.
Do you handle the permit?
Yes. Planning and permitting are part of the job, and we work alongside your architect or designer if you have one. Requirements differ between the county and each city and have changed several times, so we check what applies to your address rather than what was true last time.
Detached unit, or convert the garage?
A conversion starts with a slab and part of a shell, which usually helps. A detached unit gives you the layout you actually want and keeps the garage. We will tell you which one your property favors, and why.
Can I stay in the house while you build it?
For a detached unit, almost always. For a conversion or an attached addition we sequence the work and contain the dust so the parts you rely on stay usable, and we tell you upfront if a stage means being out of a room for a while.
Do you build the cabinets and millwork for it too?
Yes. Cabinets, doors, stairs, and railings are built in our shop for the job. Small units are where that matters most: in a space that size a cabinet run is either fitted to the inch or it is wasted room.
Request an estimate
Send photos and a rough idea of what you want. We will walk the property and tell you what it takes, with no obligation and no sales visit.