ADUs & Additions Contractors in Los Angeles
ADUs & Additions Contractors
in Los Angeles
Expert ADU & Home Addition Services That Enhance Your Property
If you’re looking for trusted ADUs & additions contractors in Los Angeles, Cala Builders delivers full‑service design and build solutions that increase your living space, create rental opportunities, and enhance your property value. Whether you’re adding an accessory dwelling unit (ADU), expanding your home, or building a separate dwelling unit, our experienced contractors in Los Angeles handle every step with professionalism and care.
From initial concept and ADU design to construction and final inspection, our team supports you through the entire process. We work closely with homeowners to transform ideas into completed spaces that serve real needs — whether for rental income, multigenerational living, or added comfort.
What Are ADUs and Additions?
An ADU, short for Accessory Dwelling Unit, is a secondary living space located on the same property as the main home. ADUs may be attached, detached, or conversions of existing areas such as garages or attics. In Los Angeles, ADUs have become a popular way to expand residential space without the cost of a traditional home addition.
Additions, on the other hand, are expansions of your existing structure. These can include adding bedrooms, expanding kitchens, creating family rooms, or building second‑story expansions. Both ADUs and additions can significantly improve quality of life and increase long‑term property value.
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Licensed, insured, and trusted by property owners across Los Angeles County (License #1156496). Speak with a Cala Builders specialist to discuss your goals and receive a clear project scope and cost estimate, no pressure, no obligation.
Transparent Pricing
ADU Construction Cost in Los Angeles
ADU pricing in LA varies by type, size, site conditions, and finish level. The table below covers realistic starting points for each ADU type Cala Builders constructs across Los Angeles County. All prices include design, permits, and full construction.
| ADU type | Starting price | Typical range | Best for |
|---|---|---|---|
| Garage Conversion ADU Best valueFastest and most affordable ADU path using your existing garage structure | $85,000 | $85K – $140K | Homeowners with an existing attached or detached garage seeking the fastest, most affordable ADU path |
| Junior ADU (JADU)Converting an existing room within the primary home into a separate unit | $90,000 | $90K – $150K | Converting an existing room or portion of the primary home into a separate unit with its own entrance |
| Attached ADU Most popularA self-contained unit added to and connected with the main home | $110,000 | $110K – $200K | Adding a self-contained unit connected to the main home, ideal for multigenerational living or rental income |
| Detached ADUA fully standalone backyard structure with maximum privacy | $140,000 | $140K – $280K | A standalone backyard structure offering maximum privacy, with the strongest rental income potential in LA |
| Two-Story Detached ADUFull apartment-style unit maximizing square footage on smaller lots | $200,000 | $200K – $380K | Maximizing square footage on smaller lots, a full apartment-style unit with upper and lower floors |
| Hillside ADU PremiumEngineered for sloped or canyon lots with specialized foundation work | $180,000 | $180K – $350K | Sloped or canyon lots requiring engineered foundations, retaining walls, and site-specific structural planning |
What’s included in every Cala Builders ADU price: Site analysis, custom architectural design, all city permit fees and filing, foundation, framing, plumbing, electrical, HVAC, insulation, drywall, flooring, interior finishes, and final inspection sign-off. No hidden costs.
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Licensed, insured, and trusted by homeowners across Los Angeles County (License #1156496). Talk to an ADU specialist general contractor and find out exactly what your ADU will cost.
ADU Cost by Square Footage
Not sure which ADU type fits your budget? Use this size-based breakdown to estimate costs before committing to a configuration. All ranges reflect Los Angeles market pricing including design, permits, and full construction by Cala Builders.
| Size | Estimated Cost Range | Best ADU Type |
|---|---|---|
| 400 sq ft | $85K – $120K | Garage conversion / JADU |
| 500 sq ft | $95K – $140K | Attached / garage |
| 600 sq ft | $110K – $160K | Detached / attached |
| 800 sq ft | $130K – $210K | Detached |
| 1,000 sq ft | $155K – $250K | Detached |
| 1,200 sq ft | $180K – $320K | Two-story detached |
Los Angeles allows detached ADUs up to 1,200 sq ft. Larger units typically offer better cost-per-square-foot value. Final pricing depends on site conditions, finish level, and utility connections.
What affects your ADU cost in Los Angeles
01. Size & square footage
Larger ADUs cost more per project but less per sq ft. LA allows up to 1,200 sq ft for detached ADUs.
02. Foundation type
Slab foundations are the most affordable. Hillside or raised foundations add $15K–$60K depending on soil and slope.
03. Finish level
Standard finishes keep costs at the lower end. Premium appliances, custom tile, and high-end fixtures add $20K–$60K.
04. Lot conditions
Access, soil type, utility proximity, and existing structures on the lot all impact site preparation costs.
05. Permit complexity
Most LA permits are streamlined under SB 9 and SB 13. Complex lots or HOA oversight may require additional review.
06. Utility connections
Separate meter, new sewer lateral, or panel upgrade can add $8K–$25K depending on distance and capacity needed.
Why Build an ADU or Addition in Los Angeles?
Our ADU & Home Addition Services
Cala Builders offers a comprehensive suite of ADU design and build services tailored to your goals:
Types of ADUs We Build
We build a wide range of ADU configurations depending on your lot and goals:
- Detached ADUs – Standalone units with separate entry and living space
- Attached ADUs – Connected units that share a wall with the primary home
- Garage Conversions – Transforming underused garages into livable space
- Second‑Story Additions – Expanding vertically to add a new unit or living area
Each ADU type offers unique benefits. Our team helps you evaluate the best option for your property and lifestyle.
Working With Professional ADU Contractors
Choosing experienced ADU contractors matters. At Cala Builders, we bring deep knowledge of Los Angeles zoning laws, permitting requirements, and construction standards. Our team works closely with you to:
- Create designs that reflect your goals
- Manage costs and timelines effectively
- Communicate clearly throughout the project
- Deliver high quality finished spaces
We combine design expertise with project management skills to make your ADU or addition build as smooth as possible. Our approach focuses on clarity, collaboration, and quality results.
Frequently asked question
How long does it take to build an ADU in Los Angeles?
Typical timelines vary based on size and complexity, but most ADU projects take several months from design to completion.
Do I need a permit to build an ADU?
Yes, permits are required. Our team helps secure all necessary approvals, including compliance with local building codes and zoning requirements.
Can I live in my home while the ADU is being built?
In most cases, yes. We coordinate construction to minimize disruption and maintain safety.
Will a new ADU increase my property taxes?
Adding an ADU or major addition may affect property taxes. We can help guide you through expected changes and local regulations.
Can I convert an existing space to an ADU?
Yes. Garage conversions and attic conversions are common strategies that often cost less than full new construction.
Start Your ADU or Addition Project Today
An ADU or home addition is one of the most rewarding ways to expand your living space and build long‑term value. As trusted ADUs & additions contractors in Los Angeles, Cala Builders delivers professional design and build services that make your project a success.
📞 Call us today to schedule a consultation and take the first step toward your new living space. Let’s build something that enhances your property and your lifestyle.
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