ADU Construction contractor serving Anaheim and Orange County CA - Ulloa Construction

CSLB Lic. #1144906. Licensed & Insured.

ADU Construction in Anaheim
& Orange County

Get a Free Estimate(714) 487-1860

ADU construction in Orange County has become one of the smartest investments a homeowner can make. An Accessory Dwelling Unit adds living space, rental income potential, and long-term property value, all without the cost and disruption of moving. Ulloa Construction builds detached ADUs, attached ADUs, and garage conversion ADUs throughout Anaheim, Irvine, Fullerton, and the greater Orange County area. We handle the full scope: architectural planning support, permit acquisition from your city's building department, foundation work, framing, utility connections, and complete interior finish. Every ADU we build is licensed under CSLB #1144906 with full general liability and workers' compensation insurance.

Serving all of Orange County, from Anaheim to San Clemente and everywhere in between.

What's Included in Our ADU Construction Service

  • Site evaluation, design consultation, and architectural planning support
  • Permit acquisition with city building department and utility providers
  • Foundation design and construction: slab-on-grade, raised, or stem wall
  • Framing, roofing, and exterior envelope construction
  • Electrical, plumbing, and HVAC rough-in and finish
  • Full kitchen and bathroom construction and build-out
  • Insulation, drywall, paint, flooring, and interior finish
  • Garage conversion ADU: insulation, electrical, plumbing, and living space conversion

How It Works

Simple Steps.
No Surprises.

  1. Step 01

    Free Consultation

    We visit your home, assess the scope, and discuss your vision. No cost and no obligation.

  2. Step 02

    Custom Proposal

    You receive a detailed written estimate covering materials, timeline, and total cost. No hidden fees, no surprises.

  3. Step 03

    Expert Build

    Our licensed OC crew gets to work with daily progress updates and strict quality checkpoints at every stage.

  4. Step 04

    Final Walkthrough

    We walk through every detail with you before considering the job complete. Your satisfaction is the standard.

Start with a Free Consultation

See the Transformation

Drag the slider to compare. Real work by our crew in Orange County.

Before ADU Construction project in Anaheim CA by Ulloa Construction
After ADU Construction completed by Ulloa Construction in Orange County CA
AFTER
BEFORE

Why Choose Ulloa Construction

20+ Years Experience

Two decades serving Anaheim and Orange County homeowners with proven craftsmanship.

OC Licensed & Insured #1144906

CSLB License #1144906, full general liability, and workers' compensation on every project.

Seismic Code Specialists

All work meets California seismic requirements. This is critical for Orange County remodels and additions.

Frequently Asked Questions

Common questions from Orange County homeowners about adu construction.

Can I build an ADU on my Orange County property?
Most single-family properties in Orange County can accommodate at least one ADU under current California law. In addition to a standard ADU (up to 1,200 square feet for a detached unit), you may also be eligible to add a Junior ADU (JADU) up to 500 square feet converted from existing interior space. We evaluate your property, lot size, setbacks, and city-specific requirements during a free initial consultation to tell you exactly what you can build.
How much does an ADU cost in Orange County?
ADU construction in Orange County typically costs $120,000 to $350,000 depending on type and size. A garage conversion ADU (converting an existing garage into a living unit) generally runs $100,000 to $180,000. A new detached ADU built from the ground up typically runs $175,000 to $300,000. High-end custom ADUs in cities like Irvine, Newport Beach, or Yorba Linda can run higher. Ulloa Construction provides free, detailed written estimates for every ADU project.
How long does it take to build an ADU in Orange County?
From the start of design through final inspection, most ADU projects in Orange County take 6 to 12 months. The permitting phase alone can take 2 to 4 months depending on city plan check workload. Construction on a detached ADU typically takes 3 to 5 months after permits are approved. Garage conversions are generally faster, often completing in 3 to 4 months total.
What are the setback and size rules for ADUs in Orange County?
Under California law, detached ADUs can be up to 1,200 square feet (or up to 50% of the primary dwelling's square footage, whichever is greater in some jurisdictions). Setback requirements are generally 4 feet from the rear and side property lines for new detached ADUs. Junior ADUs (converted from existing interior space) can be up to 500 square feet with no minimum setback. Requirements vary by city, and we review your specific lot and applicable city rules during the planning phase.
Can I rent out my ADU in Orange County?
Yes, ADUs are legal to rent throughout Orange County and California. Long-term rentals (30 days or more) are generally permitted without restriction. Short-term rentals (Airbnb or VRBO style) may be subject to local ordinances depending on your city. A one-bedroom ADU in Anaheim currently rents for approximately $1,600 to $2,200 per month, and in coastal cities like Irvine or Newport Beach, rates are typically higher.
Do you handle the ADU permit process in Anaheim and other OC cities?
Yes, we handle the full ADU permit process in Anaheim, Irvine, Fullerton, Orange, and cities throughout Orange County. This includes coordinating with architectural designers on plan sets, submitting applications to your city's building department, managing plan check comments and revisions, and scheduling all required inspections from foundation through final. We know the ADU permit process in Orange County's major cities and use that knowledge to keep your project moving.

Get a Free ADU Construction Estimate

Fill out the form and we'll be in touch within 24 hours. No obligation, no pressure.

CSLB #1144906 · Licensed & Insured · No spam, ever.

Ready to Start Your ADU Construction?

Call (714) 487-1860 or fill out the form for a free, no-obligation estimate.

Get a Free Estimate(714) 487-1860

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