Unlock your property’s full potential with professional additions and ADU construction in Los Angeles. Whether you need extra living space, a private guest house, or a second-story expansion, our licensed team transforms homes with expert craftsmanship and precision.
Custom Home Additions and ADUs for Every Need
From in-law suites to detached guest homes and compact casitas, we design and build ADUs and home additions that seamlessly match your home’s architecture and your lifestyle needs. Whether you’re planning for multigenerational living, rental income, or simply more breathing room, our team delivers turnkey solutions tailored to your goals.
“An ADU or home addition can transform your property into a multi-functional living space and increase resale value.”
Want to see what’s possible? Explore our completed ADU projects in our gallery for design inspiration.
Types of Additions & ADUs We Build
We specialize in a wide range of home additions and ADU types, each designed to maximize your property’s potential. Whether attached or detached, ground-level or elevated, our expert builders bring your vision to life.
Garage Conversions
Transform your underused garage into a fully livable ADU perfect for rentals, guests, or home offices. This is one of the fastest and most affordable ways to add functional space to your property in Los Angeles. With a typical build time of 8–10 weeks, garage ADUs require minimal structural changes and avoid costly foundations. Our team handles everything from design to permits, ensuring your garage conversion Los Angeles project stays on schedule and budget. Whether you’re planning for family expansion or rental income, a garage ADU delivers excellent ROI while boosting your home’s long-term value.
Detached ADUs (Backyard Units)
Ideal for independent living or multigenerational setups, detached ADUs offer unmatched flexibility and privacy. These backyard ADU constructions are separate from the main house and often feature full kitchens, bathrooms, and private entrances. They’re perfect for long-term rentals, aging parents, adult children, or even a personal retreat. Detached ADUs also allow for creative layout options, including patio integration and garden-facing windows. With proper design, your accessory dwelling unit in Los Angeles will feel like a fully separate home on your property.
Second Story Additions
Maximize vertical space on small lots with elegant second-floor additions — ideal for growing families or adding a luxurious suite. A second unit construction above your existing home avoids sacrificing backyard space while significantly increasing square footage. This is a great solution in neighborhoods with limited lot size or setback restrictions. We coordinate structural evaluations, roofing upgrades, and permits to ensure the addition is safe, beautiful, and fully code-compliant. Second-story additions also enhance curb appeal and can dramatically increase your property’s market value.
Interior Conversions (Basement, Attic)
Convert unused attic or basement space into cozy living areas without altering your home’s exterior footprint. Interior ADUs are discreet, cost-effective, and ideal for creating studios, offices, or guest suites. These projects typically require less permitting and fewer exterior changes, which speeds up approval. Proper insulation, lighting, and layout planning are key to making these compact spaces livable and energy-efficient. Whether you’re building an in-law unit or just need more usable space, interior ADU conversions are a smart investment in Los Angeles.
Attached Room Additions
Add extra bedrooms, bathrooms, or living areas directly to your main structure — seamlessly integrated and permit-ready. Attached room additions are ideal for families who want more space without the cost of a full detached ADU. These additions are built to match your existing architecture, keeping your home’s look consistent and attractive. With our design-build approach, we ensure smooth transitions between old and new spaces. Whether you’re expanding your master suite or adding a home office, this type of addition provides both comfort and convenience.
| Type | Best Use Case | Avg Build Time | Permitting Needed |
|---|---|---|---|
| Garage ADU | Rental income | 8–10 weeks | Yes |
| Detached ADU | Multi-gen living | 10–14 weeks | Yes |
| Second Story | Max lot use | 12–16 weeks | Yes |
Looking to enhance your outdoor space too? Check our patio remodeling solutions for backyard ADUs.
Our Process: From Plans to Permits to Construction
We simplify your ADU construction journey in Los Angeles with a proven 5-step process. From initial design to final inspection, our team manages every detail, ensuring compliance, quality, and peace of mind.
- Site Assessment & Design: We visit your property, review zoning and recommend layout options tailored to your goals.
- Permit Navigation: Our experts handle LA’s complex permit system — from planning to approval.
- Material Selection: Choose finishes, fixtures, and energy-efficient windows to maximize sustainability and comfort.
- Construction: Licensed ADU builders carry out the build using vetted materials, local codes, and safety standards.
- Final Walkthrough: We inspect everything with you and ensure the ADU is 100% move-in ready and code compliant.
Why Choose Californiarenovation for Your Addition?
With over 200 completed ADU and home addition projects across Los Angeles, Californiarenovation is trusted by homeowners for high-quality, compliant construction. We’re fully licensed, bonded, and insured — and we manage every step in-house, from drawings to final paint.
“From concept to final walk-through, we handle every step of your ADU project.”
We also provide interior and exterior painting services to ensure your new addition blends perfectly with your home.
How Much Does an ADU or Room Addition Cost in LA?
The total cost of an ADU or addition in Los Angeles depends on size, design, materials, and site conditions. Below is a general overview of what to expect. We offer detailed estimates, financing guidance, and advice on structural upgrades like roof improvements during second-story additions.
| Project Type | Size | Avg Cost Range | Garage Conversion | 350–500 sq ft | $95k–$140k | Detached ADU | 400–1,200 sq ft | $120k–$300k | Room Addition | 200–800 sq ft | $75k–$220k |
|---|
Frequently Asked Questions
How much does it cost to build an ADU in Los Angeles?
The answer depends on the size, design, and structure. The average cost to build an ADU in Los Angeles ranges from $95,000 for simple garage conversions to over $300,000 for fully detached units with premium finishes. Detached ADUs cost more due to foundation and utility needs. Permits, design fees, and construction timelines also affect pricing. Our team offers a detailed Los Angeles ADU cost breakdown with every quote to help you plan accurately.
Is it legal to convert my garage into a living space?
Yes, converting your garage into a living space is fully legal under the 2025 ADU regulations Los Angeles has adopted. You’ll need to meet zoning, fire safety, parking, and setback requirements. A garage conversion Los Angeles project requires permits from the Department of Building and Safety. Our experts help homeowners stay compliant while maximizing ROI. We guide you through every step, ensuring your adu garage conversion meets all current legal standards in LA.
What’s the difference between ADU and room addition?
The key difference between an ADU and home addition is that an ADU (Accessory Dwelling Unit) is an independent living unit with its own entrance, often used for rentals or guests. A room addition extends your home’s footprint without creating a separate dwelling. ADUs require separate permits and utilities. If you’re unsure, we offer expert guidance to help compare second unit construction with traditional los angeles room additions based on your goals and zoning.
Do I need separate utilities for an ADU?
Not always. Some ADUs use shared utilities, but many homeowners opt for separate metering for water, gas, and electricity, especially in backyard ADU construction. Los Angeles allows both setups, depending on zoning and how you plan to use the space. If you’re building for rental income or family independence, we recommend separate systems. Our team evaluates your property and helps you plan efficient, code-compliant los angeles adu services with or without utility separation.
How long does the permitting process take?
The ADU permitting process in Los Angeles typically takes 4 to 8 weeks, depending on the type of construction and the current review backlog. Detached ADUs and garage conversion to livable space LA may have different review timelines. We handle all documents, architectural plans, and zoning checks to avoid delays. Thanks to our experience with los angeles adu permits, we speed up approvals and keep your project on track from day one.
Can I rent out my ADU legally in LA?
Yes, you can legally rent out your ADU in Los Angeles. The city allows long-term rentals of permitted ADUs, including in-law suite additions and guest house builder LA projects. However, short-term Airbnb-style rentals may be restricted. Our specialists will guide you through local rental laws and los angeles accessory unit builder standards to ensure full compliance. Renting your ADU can provide steady income and improve your overall property value.
Ready to Start Your ADU or Home Addition Project?
Whether you’re building an ADU for rental income or expanding your home for family needs, Californiarenovation is here to guide you every step of the way. We offer full-service project management, transparent pricing, and expert execution — all from one trusted Los Angeles team.
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“Our garage conversion turned out better than expected. The team handled permits, construction, and even painting. The new ADU now brings in steady rental income. Highly recommend!”
– Jessica M., Echo Park
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“They built a second story addition and connected it perfectly to our main home. Fast, clean, and professional. Even the roofing upgrade was included in the project. Very happy.”
– Alan R., Culver City
