Villa Park is Orange County’s smallest city — and one of its most exclusive, known for large
lots, custom homes, and a semi-rural, equestrian feel. Those generous lots make Villa Park ideal for
room additions and ADUs. Katz Design & Builders is a licensed design-build firm (California CSLB
#1089060) that designs and builds additions, ADUs, and expansions across Villa Park, matched to the
scale and quality of its homes.

Why Villa Park homeowners choose Katz Design & Builders

We build to Villa Park’s standard. Custom-quality additions and ADUs that fit
larger, higher-end homes.
We make the most of large lots. Room to add a suite, a casita, or a full ADU
— we design it to feel like part of the estate.
Licensed, insured, accountable. CSLB #1089060, fully insured, fixed price, one
project manager.
Design-build under one roof. Design, budget, and construction from one team.

Our Villa Park addition & ADU services

Room additions & second stories

Primary suites, larger kitchens, family rooms, or full second stories, engineered and matched to the
home.

Detached ADUs & casitas

Guest houses and ADUs designed to the city’s zoning and setbacks and the character of the property.

Garage conversions

Convert space into a suite, office, or gym, done to code.

Whole-home expansion

When the project is larger, we coordinate additions and remodeling as one build.

What to expect: our process

Consultation & site visit — we assess your lot and goals and talk
budget honestly.
Design & fixed proposal — drawings, selections, itemized price and
schedule before construction.
Permits & approvals — handled through the City of Villa Park.
Build — one project manager, a clean site, updates to completion.

Villa Park additions & ADUs — FAQ

Are Villa Park’s large lots good for an ADU?

Yes — the generous lot sizes make Villa Park especially well-suited to detached ADUs and
casitas. We’ll assess what your property supports.

Do I need permits for an addition or ADU?

Yes. Both require permits and must meet zoning, setback, and building code. We prepare the plans and
manage the full process.

How long does an addition or ADU take?

Depending on scope, most run several months. You’ll get a realistic schedule up front.

Planning your project? See our ADU cost guide for Los Angeles & Orange County.

As your general contractor in Villa Park, Katz Design & Builders manages your entire project — design, permits, and construction — under one roof.

Nearby areas we serve

Katz Design & Builders also serves nearby communities including Yorba Linda, Costa Mesa, Westminster, Brea. Explore our ADU services or see all the areas we serve.