No. 01
Hollywood Hills Residence
A 4,000 square foot hillside new build, opened to the city below through full-height glazing and a cantilevered pool terrace.
Custom Homes · Hillside Construction · Fire Rebuilds
A luxury design-build firm in Los Angeles.
Addition Building & Design is a family-led design-build firm crafting custom estates, hillside residences, and resilient rebuilds across the most storied neighborhoods of Los Angeles.
Signature Work
Fewer projects. Deeper attention.
No. 02
Bel Air Estate Rebuild
A complete custom rebuild in the French tradition, carried from the first drawing to the final fixture by a single accountable team.
No. 03
Mt. Washington Hillside
A terraced residence set into a steep canyon lot, its planted roofs stepping with the slope it was engineered to hold.
The Firm
Most firms are built for volume.
Ours is built for the home in front of us.
For more than a generation, Los Angeles families have trusted us with their most ambitious residential work: homes on demanding hillsides, estates rebuilt after fire, and properties transformed end to end. Design and construction live under one roof here, and leadership stays close to every site, so nothing is lost between the drawing and the build.
40+
Years of building leadership
8×
Qualified Remodeler Top 500
4.9
Houzz rating, project after project
Bel Air · Contemporary Hillside Renovation
What we build
Four disciplines. One accountable team.
No. 01
Custom Estates & New Residences
Ground-up homes conceived for their site, their light, and the way you intend to live.
→ No. 02Hillside Construction
Engineering-led building on the demanding slopes other firms decline.
→ No. 03Resilient Rebuilds
Fire rebuilds and fire-resistant construction, managed with discretion and care for families returning home.
→ No. 04Whole-Home Transformations
Estate renovations and additions that read as though they were always part of the house.
→
The Approach
From first sketch to final walkthrough.
I.
Introduction
A private consultation at your property or our Sherman Oaks studio. We listen first.
II.
Design
Architecture, interiors and budget take shape together under one roof.
III.
Approvals
Permitting, hillside review and engineering, managed quietly on your behalf.
IV.
Construction
Our leadership stays close to the site and to you, with one point of contact.
V.
The Reveal
A final walkthrough, a considered handover, and a relationship that continues.
Leadership
A family firm, in its second generation.
Mike Ross
Founder & CEO
Over 40 years as a builder in Los Angeles, and still hands-on. Mike is a published author and national speaker on leadership who serves on the boards of Pepperdine University, the Los Angeles Sports Council, and LA5 Rotary.
Christine Ross
Managing Partner
Named to Professional Builder’s Top 40 Under 40, Christine leads the firm’s second generation. A member of the Beverly Hills Chairman’s Circle, she is currently deepening the firm’s expertise in construction law.
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.