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Custom home builder in Los Angeles, a family firm with forty years in this city.
Estates on the Westside, hillside homes above the basin, coastal houses in Malibu and the Palisades, and the family homes of the Valley. Addition Building & Design is a design-build firm: one team from the first drawing to the keys, and the people whose name is on the firm on your site.
Photograph · a custom home in Los Angeles
Los Angeles
One city, forty different ways to build.
A flat lot in Beverly Hills and a canyon lot in the Hollywood Hills are the same permit office and two different jobs. The coast weathers everything. The hills move. The Valley has its own zoning, its own overlays and its own review boards. A builder who has worked across all of it knows which questions to ask before the drawings start, and that is what keeps a Los Angeles custom home on its budget.
Mike Ross has been a builder in Los Angeles for four decades. The galleries on this site name projects in more than forty neighborhoods, from Manhattan Beach to Pasadena and from Malibu to Calabasas. Christine Ross, his daughter, runs the business and is usually the first person you will speak with. Four to five projects a year, chosen so the family can be present for each one.
The work
Built for the lot, the light and the way you live.
Los Angeles Mediterranean
A custom home in the Spanish tradition: thick walls, deep openings, a courtyard that carries the house.
Los Angeles Contemporary
A custom rebuild with the outdoor room as the center of the plan.
Holmby Hills
Outdoor living on a flat Westside lot, built to be used every month of the year.
Santa Monica Modern Farmhouse
Built new on a city lot, with a smart-home system designed in from the plans.
How we work
Design and construction under one roof, and one name on the contract.
One team
Design-build means the firm that draws the house is the firm that builds it. Mike settles the design with our design partners, has it engineered by our structural engineers, pulls the permit as contractor of record and walks the site. Already holding plans from your own architect? We build from them.
A fixed scope before you commit
After the survey and the soils report we build a line-item scope, tell you when the price locks, and put every change in writing before it happens. The number you sign is the number we build to. How a project runs, phase by phase.
The family on your site
Four to five projects a year, because that is how many the family can personally be present for. You work with the people who own the company, through every phase, with one phone number: 310.617.2722.
Where we build
Six neighborhoods we know street by street.
Pacific Palisades
Hillside and coastal custom homes, and five rebuilds under way since the fire.
Malibu
Coastal houses, a mid-century modern, and a contemporary rebuilt after fire.
Brentwood
A French custom home built from the ground up on a tear-down lot, and a job under way now.
Bel Air
A custom rebuild under concrete roof tiles, a hillside contemporary, a traditional with an ADU and pool.
Beverly Hills
A classic rebuilt on a tear-down lot, a two-story, and outdoor living with a pool house.
Hollywood Hills
A 4,000 square foot custom home on a slope, and a hillside rebuild detailed for embers.
- Pacific PalisadesWestside
- MalibuCoast
- BrentwoodWestside
- Bel AirWestside
- Beverly HillsWestside
- Hollywood HillsThe hills
- TopangaThe canyons
- AltadenaThe foothills
- Sherman OaksThe Valley
- EncinoThe Valley
- Studio CityThe Valley
- CalabasasThe west Valley
- Westlake VillageConejo Valley
- Hillside homesAcross Los Angeles
- Rebuilds after fireAcross Los Angeles
- Pacific Palisades fire rebuildRebuild
- Malibu fire rebuildRebuild
- Altadena fire rebuildRebuild
- Topanga fire rebuildRebuild
- Building from approved plansPalisades
- What a rebuild costsPalisades
- Every neighborhoodThe full list
A client's words
I had an amazing experience with Addition Building & Design. From start to finish, they were a company I could trust, providing high-quality work that was consistently on time and within budget.Rich and Dwight · Los Angeles · custom work
A family firm
You get the people whose name is on the firm.
A builder with forty years in Los Angeles, a daughter carrying the firm forward, a superintendent who is on site rather than on email, and a scheduler who tracks every dollar against the number you signed. Meet the team.
Questions Los Angeles families ask us
The answers you need before you commit.
The Westside, the hills, the coast and the San Fernando Valley, from Pacific Palisades and Malibu to Sherman Oaks, Encino and Calabasas. Our offices are in Sherman Oaks and Westlake Village. If your lot is within about an hour of either, we will come and walk it.
One firm holds the design and the construction under one contract. Mike Ross settles the design with our design partners, has it engineered by our structural engineers, pulls the permit and walks the site. Nothing is lost between an architect and a contractor, because there is one accountable team.
Both, under one contract. Our design partners draw the house with you and our structural engineers make it stand; Mike settles the design with them and holds the license that builds it. The features Los Angeles families ask us for most, indoor-outdoor rooms behind walls of glass, a kitchen built for cooking and company, a primary bath that reads as a spa, a theater, a wine room, a gym, solar with battery storage, are designed in from the first sketch, priced before you commit, and built by the same team.
Yes. Your architect stays the designer of record and we are the builder. We bring constructability and cost notes to the drawings before the price is set, and every field question during the build.
We do not quote a number before we have seen the lot. After a survey and a soils report we build a line-item, fixed scope, tell you when the price locks, and put every change in writing before it happens. The ground, the wildfire assemblies where they apply, and the window and door package move the number most. What moves a Palisades number is on our cost page.
Because that is how many the family can personally be present for. You work with the people who own the company, not a project manager you have never met.
Yes. Addition Building & Design, Inc. holds California contractor's license 925471 and carries the insurance a residential builder is required to carry. Both are yours to check before you sign.
Private Consultation
Begin with a conversation.
We take on a select number of significant projects each year. If you are considering a custom estate, a hillside build, or a full transformation, we would be glad to walk the property with you.