ADUs & Accessory Dwelling Units in San Rafael, CA
Detached, attached, garage-conversion & junior ADUs.
ADUs & Accessory Dwelling Units in San Rafael starts with understanding the local housing. San Rafael is part of our extended Bay Area, Wine Country, and Central Coast service area.
Around San Rafael, seismic design and hillside wildfire exposure are part of planning adus & accessory dwelling units, alongside a mix of historic downtown homes and newer hillside construction.
This page covers adus & accessory dwelling units specifically for San Rafael. For the full service details, see our ADUs & Accessory Dwelling Units page, or explore all the remodeling work we do in San Rafael.
San Rafael's housing spans early-1900s homes near the historic downtown and Gerstle Park, mid-century modern and ranch homes in Terra Linda and Sun Valley, and custom hillside houses in Dominican and Peacock Gap. Much of Marin sits on hilly terrain, so hillside foundations, drainage, and access shape how we plan additions and structural work. Two regional realities are central: seismic risk from the nearby San Andreas and Hayward fault systems makes foundation bolting, cripple-wall bracing, and retrofit relevant during remodels of older homes; and Marin's wooded hillsides carry significant wildland-urban-interface fire exposure, so ignition-resistant materials and defensible space matter. High Bay Area property values make quality kitchen, bath, and whole-home renovations, additions, and ADUs common, and Title 24 energy compliance applies to envelope and system work. We serve the broader Marin area beyond San Rafael, including Mill Valley and Novato.
From Downtown San Rafael, Sun Valley, and Gerstle Park to the rest of San Rafael, we match every adus & accessory dwelling units project to the age, construction, and condition of your specific home rather than a one-size-fits-all spec.
- Detached, attached, and garage-conversion ADUs
- Junior ADUs (JADUs) within the existing home footprint
- Feasibility review against your lot, setbacks, and utilities
- Full architectural plans and Title 24 energy compliance
- Ministerial / streamlined permitting under state ADU law
- New electrical, water, sewer, and gas connections or sub-panels
- Kitchens, bathrooms, and complete interior finishing
- Rental, home-office, and multigenerational layouts
- Foundation and framing suited to your site
- Coordination of the whole project under one contract
- 01
Feasibility & Site Review
We look at your lot size, setbacks, existing structures, and where utilities run, then confirm what type and size of ADU your property and jurisdiction allow under California's statewide rules and any applicable local ordinance.
- 02
Design & Plans
We develop the floor plan, elevations, and Title 24 energy documentation, tailoring the unit to how you'll use it — rental, family suite, or flex space — and to how it sits alongside the main home.
- 03
Permitting
California requires ADU applications to be reviewed ministerially, without a discretionary hearing, and on a defined timeline. We submit the plans, respond to plan-check comments, and pull the permit for your city or county.
- 04
Construction & Utilities
We build the foundation, framing, and shell, run the electrical, plumbing, and any gas or HVAC, and complete the interior — kitchen, bath, flooring, and finishes — coordinating each inspection along the way.
- 05
Final Inspection & Handoff
We complete the final building inspection, walk the finished unit with you, and hand off the space ready to occupy or rent.
Typical timeline: Typically 4 – 9 months. We provide a written schedule after assessing your San Rafael home.
Permit requirements for adus & accessory dwelling units in San Rafael are handled through City of San Rafael — Community Development (Marin County for unincorporated areas). Because California building rules — including the Title 24 energy code and local amendments — vary from one jurisdiction to the next, we confirm what your specific address requires and pull the permits and schedule the inspections the scope calls for.
- Permits are required for structural, electrical, plumbing, and mechanical work
- Seismic retrofit measures such as foundation bolting and cripple-wall bracing are often relevant given regional earthquake risk
- Hillside homes in wildland-urban-interface fire zones must use ignition-resistant materials under California Building Code Chapter 7A
- Accessory dwelling units receive ministerial approval under California state law — we prepare and submit all applications
Get Your Free ADUs & Accessory Dwelling Units Estimate in San Rafael
Free, no-obligation in-home consultation across Marin County — we respond within one business day with a fixed-price proposal.
Does California make it easier to build an ADU?
Yes. State law requires local governments to review ADU applications ministerially — meaning by objective standards rather than a discretionary hearing — and within a set timeframe. It also sets baseline size allowances and setback rules that apply statewide. Cities can add some local standards, so we confirm the exact rules for your jurisdiction during feasibility.
How big can an ADU be?
State law establishes size allowances that generally permit a detached ADU up to a defined square footage, with a smaller footprint always allowed under streamlined standards. Garage conversions and attached units follow their own rules tied to the existing structure. The exact maximum for your property depends on lot size, unit type, and local ordinance, which we verify before design.
Do I have to live on the property to have an ADU?
Under current statewide law, jurisdictions generally cannot impose an owner-occupancy requirement on a standard ADU, which is part of what makes them work as rentals. Junior ADUs (JADUs), which are carved out of the existing home, do require the owner to occupy the property. We confirm how these rules apply to your specific plan.
Can an ADU have its own utilities?
Yes. Depending on the design and your existing service, we run dedicated or sub-metered electrical, water, sewer, and gas as needed. For detached units this often means new trenching and connections; garage conversions and JADUs may be able to tie into existing service. We plan the utility approach during design.
How long does an ADU take to build?
Timelines vary with unit type, site conditions, and the permitting queue in your jurisdiction. A garage conversion or JADU is typically faster than a ground-up detached unit. We give you a realistic, written schedule after feasibility and design.
Do I need a permit for adus & accessory dwelling units in San Rafael?
It depends on the scope. City of San Rafael — Community Development (Marin County for unincorporated areas) sets the requirements for San Rafael, and they can differ from neighboring California jurisdictions. We confirm what your project needs before we start and handle the permit and inspection process as part of the job.
Do you handle adus & accessory dwelling units on both older and newer San Rafael homes?
Yes. From Downtown San Rafael, Sun Valley, and Gerstle Park to the rest of San Rafael, San Rafael in Marin County spans a range of housing eras and construction types, and we tailor the adus & accessory dwelling units plan to the age and condition of your specific home rather than a one-size-fits-all template.
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