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How a Home Addition Works With Us
Every home addition starts with a free consultation at your home. From there, we design the addition in 3D so you can see how the new space connects to your existing house before construction begins.
You get a written scope, timeline and change-order process before work starts. We handle all permit applications, plan checks and inspections, whether your project goes through the Los Angeles Department of Building and Safety (LADBS) or another city. Hillside lots in areas like Encino, Sherman Oaks and Woodland Hills can need grading permits and geotechnical reports, and we plan for those during design.
One project manager leads your addition from design through final inspection and gives you daily updates during the build. Most additions take 6 to 18 months including design and permitting, depending on their size and the approvals your lot needs. See our design-build process for each step.
Explore Endless Possibilities for Your
Home Addition
A few of the home additions we have built for homeowners in Los Angeles, Sherman Oaks, Studio City, North Hollywood, Woodland Hills, West Hills, Torrance, Cerritos, Pico Rivera, Simi Valley, Newbury Park, Orange and Lake Forest.
Our Latest Projects
Home Addition Contractor in Los Angeles Since 2001
Built To Perfection, Inc. (CSLB #837987) has been building and remodeling homes in Los Angeles since 2001. We build room and primary-suite additions, second stories, and expansions to the front or rear of a home, designed so the new space looks like it was always part of the house.
Recent additions include The South Bay Expansion, an 800 sq ft addition in Torrance that expanded both the front and rear of the home, and The Hillside Modern Addition in Woodland Hills, which added living space and spa-style bathrooms. You can see more in our portfolio.
Where We Build Home Additions
We build home additions across Los Angeles County and Orange County, including the San Fernando Valley, the Westside and Malibu, Pasadena, the South Bay and Orange County.
Many additions include a new bathroom or a larger kitchen. We handle those as part of the same project, with the same team. See our bathroom remodeling and kitchen remodeling services for what those include.
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Your Full-Service Home Addition Partners
Bedroom & Master Suites
Sleep easy with custom-designed bedrooms where you can relax and unwind in style.
Garage Conversions
Unlock the potential of your garage by transforming it into a home office, studio, rental unit, or extra living space.
New Bathrooms
Add value and convenience with beautifully designed and expertly constructed bathrooms.
Foundations
Make sure your home is rock-solid and built-to-last so you can live worry-free.
So, what’ll it cost you?
The guessing game is over.
Get a detailed price estimate for your home addition.
Download Our Pricing Guide
Home Additions FAQ
What is a home addition?
A home addition is the process of expanding your current living space by adding new rooms, floors, or other functional areas. This can include adding a new bedroom, kitchen, bathroom, or even a second story. Home additions are ideal for homeowners looking to increase space without the need to move.
How much does a home addition cost?
Home additions with Built To Perfection start at $50,000 in Los Angeles County and Orange County. The final cost depends on the size of the addition, whether it is a ground-floor room addition or a second story, the finishes you choose, and what your lot needs for permits, such as grading or geotechnical reports on a hillside. For context, the 2025 Cost vs. Value report puts a midrange primary suite addition in Los Angeles at about $183,000 and an upscale one at about $387,000, and a midrange bathroom addition at about $64,000. Our room addition cost guide for Los Angeles walks through what drives the number. Every addition is designed in 3D and built on a fixed-price contract. After a free consultation at your home, you get a written scope, timeline and estimate before any work starts.
How long does it take to complete a home addition?
Most home additions take 6 to 18 months from the first design meeting to final inspection. Design and permitting usually take the first part of that time, and construction the rest. A single-room addition sits at the shorter end, while a second story or a hillside lot that needs grading permits and geotechnical reports takes longer. You get a written timeline before work starts, and your project manager gives you daily updates during the build.
Do I need a permit for a home addition?
Yes. Almost every home addition in Los Angeles County and Orange County needs a building permit, and many also need planning or zoning approval. We handle the permit applications, plan check corrections and inspections for you, whether your project goes through the Los Angeles Department of Building and Safety (LADBS) or another city. If your lot is on a hillside, we also plan for grading permits and geotechnical reports during design.
Will a home addition increase the value of my home?
It often can. A permitted addition adds finished square footage, and an extra bedroom, bathroom or primary suite can make a home more useful and more appealing to future buyers. How much value it adds depends on your neighborhood, the size and quality of the addition, and how well it fits the rest of the house. Many homeowners also compare the cost of adding on with the cost of selling and buying a larger home. A local real estate agent or appraiser can give you a value estimate for your area.
Ready to make space for what matters most?
Schedule a free consultation at your home to talk through the size, timeline and budget for your addition.