ADUs & Garage Conversions in Northern California
By Lermaxx Builders
Your Property Has More Potential Than You Think
That backyard corner or half-empty garage could be your next best investment.
An accessory dwelling unit, or ADU, turns unused space into a fully independent living area with its own kitchen, bathroom, and private entrance. Some homeowners build one for rental income, others to give aging parents or adult kids a place of their own, and plenty use it as a home office, studio, or guest suite.
If you already have a garage that's collecting boxes instead of earning its keep, a conversion can get you there faster and for less. Either way, Lermaxx Builders designs and builds the entire unit to code, so it's ready to live in from day one.
One Space, Plenty of Possibilities
The best part of an ADU is how many problems it can solve. Here's how Northern California homeowners are putting theirs to work.
Rental Income:
A well-built ADU can generate steady monthly income and start paying for itself. We design rental-ready layouts with the privacy and independence tenants look for.
Room for Family:
Give aging parents, adult children, or extended family a comfortable place of their own without giving up your own space. Aging-in-place features and single-level layouts keep it accessible for the long haul.
A Dedicated Workspace:
Trade the kitchen-table office for a real one. A detached ADU makes a quiet, separate studio, workshop, or work-from-home space that keeps your job and your home life apart.
Space for Guests:
Host family and friends in comfort with a private guest suite that gives everyone their own space. When it's not in use, it's flexible square footage you can put to work any way you like.
Frequently Asked Questions About ADUs & Garage Conversions
- What's the difference between an ADU and a garage conversion?expand_more
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An ADU is a self-contained living unit that can either be detached from your home or built as an attached addition, while a garage conversion transforms your existing garage into that living space.
A conversion usually costs less and moves faster since the structure is already there, but a detached ADU gives you more freedom in size and layout. We'll help you weigh which one fits your property and your goals.
- How much does it cost to build an ADU?expand_more
- Most ADUs and garage conversions land between $150,000 and $325,000, with fully custom units running $325,000 and up. The final number depends on size, whether you're converting existing space or building new, and the finishes you choose. Our Cost Guide breaks all three tiers down in detail.
- Can I rent out my ADU, and will it add value to my property?expand_more
- Yes on both counts. California law has made it easier than ever to build and rent ADUs, and a quality unit can bring in reliable rental income while adding real resale value to your home. We build every unit rental-ready, so the option is yours from the start.
Our Process
We start with a conversation about your goals, budget, and timeline, then visit your property to see the space firsthand. From there, you get a detailed written scope and honest estimate, so you know exactly what you're getting before any work begins.
Once you approve the scope, we handle the groundwork that keeps construction on track. We finalize the contract, coordinate any design, engineering, and permits your project needs, and line up schedules, subcontractors, and materials before we build.
Our crew builds to the approved scope with quality materials, a clean jobsite, and daily communication. We finish with a walkthrough, punch list, and full documentation, and hand you a completed space that's ready to enjoy.
Where We Work
Lermaxx Builders is based in Vacaville and builds for homeowners throughout Solano County and the greater Northern California area. Our team regularly works across the Bay Area, Napa Valley, and the surrounding communities listed. Don't see your town on the list? Reach out anyway, and we may be able to help.
Our Service Area
- American Canyon
- Antioch
- Benicia
- Concord
- Danville
- Dixon
- Fairfield
- Lafayette
- Napa
- Pleasant Hill
- San Ramon
- Vacaville
- Vallejo
- Walnut Creek
Our Remodeling Cost Guide
Have costs and project details right at your fingertips! Inside our comprehensive cost guide, you'll find:
- Costs for remodels, ADUs, and commercial renovations
- Cost tiers for each type of project
- What's included in each tier
More Room With the Space You Already Have
Let's Talk About the Possibilities
You don't have to move to get the extra space your life calls for. Tell us how you'd use it, and we'll show you what's possible on your property.