ADU BUILDER &
CONTRACTOR IN
THE BAY AREA
Building an Accessory Dwelling Unit in the San Francisco Bay Area requires more than drawings and a construction crew. It requires city-specific zoning knowledge, complete permit documentation, structural coordination, and disciplined project management.
Mendez & Son’s Construction operates as a design-build ADU builder serving homeowners in Palo Alto, Mountain View, San Mateo, Walnut Creek, Redwood City, and surrounding communities. We handle the process from concept through final inspection.
Builder selection determines whether the process moves efficiently — or stalls in review.
WHY ADUs ARE IN
HIGH DEMAND
Housing pressure across the Peninsula, South Bay, and East Bay is not new. High property values, limited inventory, and strong rental demand have made ADUs one of the most practical property upgrades available to homeowners.
Unlike cosmetic remodeling, an ADU creates an additional functional unit on your property. It changes how the property can be used. For many homeowners, that makes it a strategic investment rather than a design decision.
Independent Living Space
Add living space without relocating — privacy and function on your existing lot.
Rental Income
Create long-term income in a strong local rental market with a permitted secondary unit.
Property Value
A permitted ADU adds a legal functional unit — a meaningful difference at resale.
Future Flexibility
Family housing, guest space, home office, or downsizing option. Changes how the property works for decades.
TYPES OF
ADUs WE BUILD
Every property is different. We help homeowners evaluate which ADU type fits their lot, budget, and long-term goals.
Detached ADU
A standalone structure built in the backyard. Maximum privacy, strong rental appeal, and flexible layout possibilities. The most versatile option.
Detached ADU DetailsJADU
Connected to the main home through a shared wall. More efficient utility tie-ins and lower site impact compared to detached builds.
JADU DetailsGarage Conversion
Repurposes an existing structure into a legal living unit. Uses existing foundation and framing, often faster than ground-up builds.
Garage Conversion DetailsJADU
A Junior ADU created within the existing footprint of the home. Lower structural impact, smaller footprint, ideal for compact secondary units.
JADU & Design-BuildONE TEAM.
CONCEPT THROUGH
COMPLETION.
We operate as a design-build contractor. One coordinated team manages the project from planning through construction. This reduces disconnect between architect, engineer, and builder.
Feasibility
Lot evaluation, zoning review, utility location, access points, and intended use. We align scope with property constraints early.
Design & Planning
Plans developed with construction in mind. Layout efficiency, structural practicality, and build sequencing considered during drafting.Design decisions account for cost impact and inspection sequencing — not just aesthetics.
Permits
ADU permits require site plans, architectural drawings, structural calculations, energy compliance, and utility coordination.We manage submissions and respond to plan check comments.
Construction
Site prep, foundation, framing, rough mechanicals, inspections, insulation, finishes, final inspection. Scheduling, trades, and communication managed through Buildertrend.
LOCAL
PERMITTING
IS NOT UNIFORM
California legislation has made ADUs more accessible, but “easier” does not mean simple. Each city has its own interpretation of state law, its own submittal requirements, and its own review process.
Setbacks, height restrictions, lot coverage, utility connections, fire access, parking exemptions, and design standards all vary by municipality. Permit knowledge is not optional — it is central to project success.
As an ADU contractor serving Peninsula and East Bay cities, we prepare submissions correctly the first time and coordinate with each jurisdiction throughout review.
Common ADU Mistakes We Prevent
- Incomplete permit submissions that trigger plan check revisions
- Underestimating structural upgrades for garage slabs, roof loads, and bracing
- Overlooking utility capacity — panels, sewer laterals, water service sizing
- Designing without setback compliance — even inches of encroachment require redesign
- Choosing the lowest bid without coordination structure
When a builder is unfamiliar with local interpretation, homeowners pay for it in time and revisions.
BUILT FOR
RENTAL INCOME
OR FAMILY
The regional rental market remains strong. A permitted secondary unit provides legal rental structure, independent utilities where applicable, long-term income potential, and increased resale appeal. An ADU can help offset mortgage expenses or provide stable income during retirement.
Not every ADU is built for tenants. Many homeowners build for aging parents, adult children, live-in caregivers, or extended family. Multigenerational living is common throughout the Bay — an ADU provides independence while maintaining proximity.
Layout decisions differ when building for family versus rental. We discuss intended use early so the design aligns with your goals.
ADU CONSTRUCTION
PENINSULA
TO EAST BAY
Palo Alto does not review ADUs the same way Walnut Creek does. Mountain View differs from San Mateo. Even within the same county, interpretation varies between reviewers.
As a local ADU builder, we understand that compliance is city-specific. That experience reduces surprises.
All Areas We ServeCAPITAL SHOULDN'T
STALL YOUR
ADU PROJECT
In high-cost markets, liquidity can be a limiting factor even for financially strong homeowners. We assist clients in accessing renovation financing when appropriate.
This is not a promotional tactic. It is a practical option for homeowners who prefer not to tie up cash reserves. For qualified homeowners, approvals are straightforward and funding becomes available quickly.
If financing helps move your ADU forward, we can walk you through the process. If you prefer to fund independently, that works as well.
“Upfront capital should not be the reason a well-planned ADU sits on hold.”
— Mendez & Son's Construction
WORK WITH AN
EXPERIENCED
ADU CONTRACTOR
Every ADU project timeline depends on city review duration, scope complexity, structural requirements, site conditions, and utility coordination. Permitting alone can take several months.
We do not promise unrealistic timelines. Well-planned sequencing matters more than speed. We provide structured phases and realistic scheduling once plans and approvals are in place.
If you are considering a detached ADU, attached ADU, garage conversion, or JADU — schedule a consultation.
- ✓ Permit familiarity across Peninsula and East Bay cities
- ✓ Engineering coordination and organized construction management
- ✓ Clear communication via Buildertrend
- ✓ Practical decision-making, not sales pressure
- ✓ Structured phases with realistic scheduling
SCHEDULE YOUR
ADU CONSULTATION
We’ll review your property, discuss feasibility, and outline next steps. No pressure — just clarity.
Clear scope · Clear plan · Clear expectations
Serving Palo Alto · Mountain View · San Mateo
Walnut Creek · Redwood City · Bay Area