Garage Conversion ADU Contractors in the Bay Area
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Turn Your Garage Into a Permitted ADU
Converting a garage is one of the most practical ways to add an ADU in the Bay Area. The walls, roof and foundation are already there, and California law makes garage conversions easier to permit than new construction. Axiom Renovation (CA Lic. #1105006) handles the whole job: site assessment, design, permits, utility work and construction.
For San Jose specifics, see our San Jose garage conversion page.
Why Garage Conversions Are Easier to Permit
- No new setbacks: converting an existing structure generally does not require meeting the setbacks a new building would need, as long as fire safety is met.
- Parking does not have to be replaced: under state law, a city generally cannot require you to replace the parking spaces lost when a garage becomes an ADU.
- Attached or detached: a detached garage can become a full ADU. An attached garage can become an ADU, and in some cases a junior ADU.
Local rules still apply, so we confirm them for your parcel before design starts.
Process
Our ADU Process
Step 1
Initial Consultation
We begin with a thorough initial consultation to understand your needs, assess your space, and discuss your vision, budget, and timeline.
Step 2
Planning and Design
At Axiom Renovation, we understand that the planning and design phase of an ADU project is crucial to its success. Our dedicated project managers will work closely with you to understand your goals, design ideas and budget for the project.
Step 3
Material Selection
We guide you through selecting high-quality materials that fit your design and budget, ensuring durability and aesthetic appeal.
Step 4
Demolition and Preparation
Careful demolition and preparation work are performed to ready the space for construction, minimizing disruptions and ensuring a clean work environment.
Step 5
Construction and Installation
Our skilled craftsmen handle the construction phase, including obtaining permits, scheduling appointments, and the actual construction and installation with precision, building the new space according to the approved design.
Step 6
Electrical and Plumbing Work
Licensed professionals conduct all electrical and plumbing work, ensuring everything is up to code and seamlessly integrated into the new ADU.
Step 7
Painting and Finishing
We pay close attention to detail during the painting and finishing stage, ensuring all surfaces are properly prepared and beautifully finished.
Step 8
Fixture and Appliance Installation
We expertly install all fixtures and appliances, ensuring they function correctly and fit perfectly with the overall design.
Step 9
Final Touches and Clean-Up
Final touches are added, and a thorough clean-up is performed, leaving your new space pristine and ready for use.
Step 10
Final Walkthrough and Client Satisfaction
We conduct a final walkthrough with you to ensure every detail meets your expectations and address any remaining concerns, ensuring your complete satisfaction.
What a Garage Conversion Involves
A garage was built to store cars, not to be lived in, so most conversions include:
- Replacing the garage door with an insulated wall, windows and an entry door
- Raising or leveling the floor and adding a moisture barrier over the slab
- Insulation, drywall and energy upgrades to meet California’s Title 24 energy code
- New plumbing for a kitchen and bathroom, often with a trench to the main sewer line
- Electrical work, which may include a panel or service upgrade
- Egress windows, smoke and CO alarms, and fire separation where the garage is attached
Garage Conversion or New Detached ADU?
A conversion is usually the faster and simpler path when the garage is structurally sound and has enough ceiling height. A new detached ADU makes more sense when you want more space, a different layout, or the garage is in poor condition. During the site assessment we look at both options and explain the trade-offs. See Bay Area ADU builders and junior ADUs for the other options.
Frequently Asked Questions
Can I convert my garage into an ADU?
In most Bay Area cities, yes. California law allows existing garages to be converted into ADUs, and cities generally cannot require you to replace the lost parking.
Do I need a permit to convert a garage?
Yes. A garage conversion into living space needs a building permit, and the finished unit must pass inspection to count as a legal ADU.
Do I have to replace the garage parking?
Generally no. State law prevents most cities from requiring replacement parking when a garage is converted into an ADU.
Can an attached garage become an ADU?
Yes. An attached garage can usually be converted into an ADU, with fire separation and a separate entrance. In some cases it can become a junior ADU instead.
What usually needs upgrading in a garage conversion?
Most conversions need a new wall and windows where the garage door was, floor leveling, insulation, plumbing for a kitchen and bathroom, and electrical work that sometimes includes a panel upgrade.