R&Y CO.
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Lic. CSLB · CA
RAMIREZ & YANG CO.
SINCE 1994 · LOS ANGELES
№ 001
RAMIREZ
& YANG CO.
Southern California's design‑build firm — one set of hands from first sketch to final inspection.
Design, engineering and construction — under one roof.
I — How we work

Four things we hold to.

01
Thought through before it's built.

We draw the building, price it and plan the sequence ourselves, in detail, before anything is ordered. Surprises get found on paper, where they cost nothing.

02
The price holds.

Construction always throws something at you — a pad that needs more compaction, a trench that hits something. Those are ours to solve. The price moves only if you change the design.

03
You pay for work that exists.

Every invoice is tied to a line of the budget and to work you can see on site. No lump-sum draws ahead of the work.

04
One person is accountable.

The person who designed your project is the person pricing it and the person on site with the crew. Nothing is lost in a hand-off.

II — PRACTICE

A Southern California design-build firm: custom homes, RCFE care homes, barndominiums, ADUs, and restorations. Drawings and field execution under one license, end to end on every project.

III — Standing
FIG. 02
01
Building in SoCal · est. 1993
0
yr.
02
Completed residential and commercial projects
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03
SoCal cities served
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Point of contact · first sketch to final inspection
1
IV — Territory
FIG. 03 · MAP

Where we've built
since 1993.

1995
0 / 42 PROJECTS
0 CITIES
95
00
05
10
15
20
25
NP A C I F I CLOS ANGELESSAN BERNARDINOORANGERIVERSIDE
Awaiting plot
V — Founder

Engineering rigor.
Construction craft.
One standard.

Founder · 01
SYSTEMS · BUILD
PORTRAIT · YANG
Yang
Software engineer + GC · Systems lane
CA Lic. GC (B)Design exp.Founding Eng. · TexturaAcq. Oracle

Engineering rigor applied to design-build construction. Founding engineer at Textura, the construction-finance platform later acquired by Oracle that processes billion-dollar-monthly volume for general contractors and developers nationally. A licensed General Contractor in California (Class B) with hands-on design experience, Yang owns the design-build seam end-to-end — feasibility sketch through final inspection, no handoff between phases, no detail lost in translation. The engineering background runs the quality side: work built to pass inspection the first time, not after corrections. At R&Y, Yang is on site leading the field crews — the person who drew the plans and priced the job is the one building it. The systems he built run underneath: every client sees the same budget we do — line items, what has been billed against each, and where the money is, in real time. Custom homes, care homes, barndominiums, ADUs, restorations. Engineering for quality and reliability. Design for one process, sketch to keys.

VI — Flagship ADU Build
Walnut, CA · 2020

Walnut 2020
RENOVATION + ATTACHED ADU + JADU

COVER · WALNUT 2020
Scope
Full renovation + attached ADU + JADU
Area
1,200 sf → ~3,000 sf 1 unit → 3 units
Duration
10 months to build
Role
Design–build A + GC

A 1962 single-story ranch on a corner lot in Walnut. A detached unit would have fit, but it would have shaded the main house, given the yard up to setbacks and split the property for good — so we designed an attached ADU and a junior ADU within the existing structure: three legal units under one roofline, with the original home fully livable for the owner.

One mechanical design serves all three units — centralized air and hydronic radiant floors — cutting utility costs while adding comfort. From the street the house still reads as a single home: no awkward massing, no obvious rental footprint, and the flexibility to recombine the spaces later.

Gallery · 06 PLATES
← SWIPE
X — Office

Diamond Bar.
California.

  • D-01
    DIAMOND BAR
    1370 Valley Vista Drive, Suite 200, Diamond Bar, CA 91765
XI — Begin

Schedule a feasibility call.

Pick a time that works for you. We'll review your project together, no obligation.

Call(909) 551-4566
RAMIREZ & YANG CO.
Design-Build · Building since 1994
№ 001
Practice
  • Work
  • Founder
  • Process
Licensure
  • CSLB #1157101
  • OSHA 30
  • EPA RRP
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The work speaks.
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