ADU Construction in San Diego, CA

Home 360 Construction builds permitted ADUs for San Diego homeowners who want added living space or rental income.

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  • Adds a fully independent living unit to your existing San Diego property without purchasing new land
  • Creates a potential long-term rental income stream in one of California's highest-demand housing markets
  • Supports multigenerational living by giving family members a private space with a separate entry
  • Increases assessed property value by adding permitted, livable square footage to your lot
  • Converts underused garage or backyard space into a code-compliant, income-producing structure
  • Reduces project risk through a contractor who knows San Diego city and county submittal requirements
A newly constructed detached ADU in a San Diego backyard, showing a single-story unit with a private entrance, smooth exterior finish, and a small patio adjacent to the main residence. The structure sits on a residential lot typical of San Diego neighborhoods, with the primary home visible in the background.

Expert ADU Construction in San Diego, CA

Home 360 Construction handles ADU construction for San Diego homeowners from the ground up. We manage detached new builds, attached additions, and garage conversions on single-family lots across the city. Our work covers site evaluation, plan preparation, city submittal, and full construction through final inspection. San Diego's ADU rules have shifted significantly in recent years. The City now caps units per lot under its updated Bonus Program, and properties in the Coastal Overlay Zone face separate review requirements. Knowing which rules apply to your specific address before breaking ground saves time and money. We work with homeowners who want a private space for family members, a long-term rental unit, or a flex space that can serve both purposes over time. If your property is in the city or unincorporated county, we can assess what your lot allows and walk you through each step. Call Home 360 Construction to talk through your ADU project in San Diego.

What's included

  • Adds a fully independent living unit to your existing San Diego property without purchasing new land
  • Creates a potential long-term rental income stream in one of California's highest-demand housing markets
  • Supports multigenerational living by giving family members a private space with a separate entry
  • Increases assessed property value by adding permitted, livable square footage to your lot
  • Converts underused garage or backyard space into a code-compliant, income-producing structure
  • Reduces project risk through a contractor who knows San Diego city and county submittal requirements
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ADU Construction FAQ

Common questions about adu construction in San Diego, CA.

Yes, most San Diego residential lots with an existing single-family home are eligible for at least one detached ADU. The exact size and placement depend on your zone, lot dimensions, and whether your property falls inside the Coastal Overlay Zone.

We build detached new construction ADUs, attached ADUs, and garage conversions on San Diego properties. Each type has different size limits and site requirements, so we assess your lot before recommending an approach.

A detached ADU in San Diego can be up to 1,200 square feet, and an attached ADU can be up to 50% of the primary home's floor area, also capped at 1,200 square feet. ADUs up to 800 square feet are protected under California state law regardless of local lot coverage limits.

In most San Diego cases, you are not required to replace off-street parking spaces when a garage is converted or demolished to build an ADU. Exceptions apply in certain areas such as the Beach Impact Area of the Parking Impact Overlay Zone.

Yes, San Diego homeowners can rent out a permitted ADU as a long-term rental unit. State law removed owner-occupancy requirements for ADUs permitted between 2020 and 2024, and current city rules continue to allow rental use.

San Diego ADU regulations have changed multiple times in recent years, and rules differ between the City of San Diego and unincorporated county areas. A contractor familiar with local submittal processes helps avoid costly redesigns and keeps your project moving through plan check.

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What San Diego County homeowners say.

5.0
21 Google reviews

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Home 360 Construction did three different projects at my house. 1. Retaining walls, concrete work, and a large shed. 2. Guest bathroom, new flooring, repiping and sewer line replacement. 3. Master bath remodel. Excellent work in all areas. I would highly recommend this company for any of you upcoming projects, remodels and new builds.

Kenneth Telles Google review · March 2026

Have had multiple amazing experiences with Heron and Home 360! They’ve handled full turnkey remodels for me and we were thrilled with the service, process and results! Would highly recommend if you want a professional experience with a kind, capable and thoughtful team.

Joe Worth Google review · April 2026

We love our kitchen remodel. Jennifer is a great designer with an eye for details. Heron did a fantastic job doing the construction. We definitely will use them for our future projects.

Nasrin Azordegan Google review · March 2026

I recently had my flooring replaced by Construction 360, and I couldn’t be happier with the results. The team was on time, worked hard throughout the entire project, and delivered excellent quality. Their pricing was very reasonable, especially considering the level of craftsmanship and professionalism they provided. Everything was completed smoothly and efficiently. I would definitely recommend Construction 360 to anyone looking for reliable and high-quality work.

7NonnaCarol Google review · March 2026

We write this review with so much gratitude for working with 360 Home Construction INC! Heron and his team were professional, knowledgeable, good communicators, kept to a schedule and arrived at our home on time daily. They had a great respect for our wishes, kept to the budget and when faced with unforeseen conditions discussed options with us. When and if needed, change orders were issued and work continued. Heron and his team’s workmanship and attention to detail was exceptional, they always left our home clean and were easy to work with. He remodeled our 1989 home into present day living and we totally trusted him! Our home is beautiful and we highly recommend Heron and his team, 360 Construction INC!!

anastasia studer Google review · April 2026

Proudly Based in San Diego, CA

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Hours

  • Monday 8:00 AM - 5:00 PM
  • Tuesday 8:00 AM - 5:00 PM
  • Wednesday 8:00 AM - 5:00 PM
  • Thursday 8:00 AM - 5:00 PM
  • Friday 8:00 AM - 5:00 PM
  • Saturday Closed
  • Sunday Closed