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La Jolla Coronado Point Loma Del Mar Encinitas Mission Valley North Park Escondido Poway El Cajon
Contact (619) 9711354
San Diego, California

ADU & Room Additions
in San Diego

Maximize your property's value and living space with custom ADUs, garage conversions, and expertly built room additions throughout San Diego County.

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ADU under construction
Maximize Your Property

Expert ADU
Construction

California's ADU laws have made it easier than ever to add living space to your property — but navigating permits, design requirements, and construction timelines still takes expert guidance. At Chris Mejia Builder, we specialize in building accessory dwelling units and room additions that comply with San Diego's municipal codes and state regulations.

Whether you're planning a detached backyard unit, a garage conversion, or a Junior ADU, our team handles every phase from permit applications to final inspection. ADUs are one of the best investments San Diego homeowners can make — generating rental income, increasing property value by 20–30%, and creating flexible living spaces for family, guests, or a private home office.

01
ADU Options

Types of ADUs
We Build

  • Detached backyard ADUs
  • Attached ADUs
  • Garage conversions
  • Junior ADUs (Jr. ADU)
  • Second-story additions
  • Room additions & expansions
  • Permitted home office studios
  • In-law suites & guest houses
Carpenter framing a home addition wall
02
From Permits to Keys

Our ADU
Process

Navigating San Diego's ADU permitting process can be complex, but we make it seamless. We start with a free site consultation to evaluate your property's potential, then coordinate with architects and engineers to develop plans that meet the City of San Diego's zoning and building code requirements.

From there, we handle permit applications, utility hookups, and every phase of construction — framing, electrical, plumbing, HVAC, finishes, and landscaping. Our team manages all city inspections and ensures your new ADU or addition is fully permitted, code-compliant, and move-in ready.

Home construction framing in progress
Frequently Asked Questions

ADU & Room Addition FAQs

How much does an ADU cost in San Diego?

ADU costs in San Diego typically range from $150,000 to $400,000+ depending on the type (detached, attached, or garage conversion), size, finishes, and site conditions. Garage conversions tend to be on the lower end, while detached new-build ADUs with premium finishes will be higher. We provide detailed written estimates after a free site consultation.

How long does it take to build an ADU in San Diego?

Most ADU projects take 6 to 12 months from start to finish, including the permitting process. The City of San Diego's plan review typically takes 4–8 weeks, with construction running 3–6 months depending on the scope. We provide a detailed timeline during the estimate phase so you know what to expect.

Do I need a permit for an ADU in San Diego?

Yes, a building permit is required for all ADU construction in San Diego. The good news is that we handle the entire permitting process for you — including plan submittal, city reviews, and all required inspections. You won't need to deal with the city directly.

What is a Junior ADU?

A Junior ADU (Jr. ADU) is a small dwelling unit of 500 square feet or less that is converted from existing space within a single-family home, such as a bedroom or attached garage. Jr. ADUs are typically more affordable to build than full ADUs because they use the home's existing footprint, and they can include a small kitchen or kitchenette and a separate entrance.

Will an ADU increase my property value?

Yes. Adding a permitted ADU to your San Diego property can typically increase its appraised value by 20–30%. Beyond the property value boost, an ADU can generate $1,500–$3,000+ per month in rental income, making it one of the best long-term investments you can make in your home.

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Other Services

Custom Home Building
Ground-up custom homes built to your vision, from foundation to final finish.
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Home Remodeling
Full-home remodels including kitchens, bathrooms, and complete interior transformations.
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Commercial Build-Out
Tenant improvements and commercial construction for offices, retail, and restaurants.
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Outdoor Living
Patios, pergolas, outdoor kitchens, and hardscaping designed for San Diego living.
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Repair & Restoration
Structural repairs, water damage restoration, and home maintenance services.
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Start Your ADU Project

Ready to Add
Living Space?

Every project starts with a conversation. Tell us about your ADU or addition plans and we'll put together a free, no-obligation estimate — usually within 48 hours.

Get a Free Estimate (619) 9711354
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