Preconstruction discipline.
Develop the scope, test the budget, identify risk, and plan procurement before mobilization.
Learn moreSouthern California General Contractor
Built well.
Managed intelligently.
Preconstruction, general contracting, and construction management built around disciplined execution and clear accountability.
Architectural context image. UnionStone project experience is identified separately and transparently.
Who UnionStone Is
The company is new. The experience behind it is not.
UnionStone Construction Group is a Southern California general contracting and construction management company built around disciplined project execution.
We bring ownership-level accountability, preconstruction discipline, and field coordination into one operating organization - not a loose collection of trades.
Our companyOperating Philosophy
Construction is coordination.
Capital. Design. Permitting. Trades. Schedule. Cost. Quality. Successful construction aligns those moving parts before they become field problems.
Continuous leadership.
The team planning the work remains accountable through construction, turnover, and closeout.
Learn moreTransparent controls.
Budget, schedule, selections, procurement, approvals, and changes are documented and communicated.
Learn moreThe UnionStone Process
One project. One operating discipline.
Decisions are organized into a clear sequence so ownership, design, permitting, procurement, and field execution stay aligned.
01
Define
Objectives, constraints, scope, and success criteria.
02
Plan
Budget, constructability, schedule, permitting, and risk.
03
Procure
Bid leveling, selections, long-lead items, and trade alignment.
04
Build
Field coordination, quality control, reporting, and decisions.
05
Close
Punch, documentation, turnover, and a deliberate finish.
Markets Served
Built for owners who need the work managed as carefully as it is constructed.
Architectural imagery is used for market context and is not represented as completed UnionStone-contracted work.
Core Principles
The principles came first.
01
Work harder than the people around you.
02
Become the person people rely on.
03
Leave the job better than you found it.
04
Communicate early, clearly, and continuously.
JD
Juan Doyer
Founder / President
Founder Profile
Both sides of the table.
Juan grew up around construction. His father established a family roofing and construction company in 1992, and from an early age Juan spent weekends and summers on jobsites, accompanying estimates, and learning how reputation is built and protected.
His experience later expanded across construction operations, estimating, project budgeting, client communication, subcontractor coordination, scheduling, permitting, change management, real estate, property acquisitions, and owner-side decision making.
Why UnionStone
Execution is the product.
Owner-level accountability
Responsibility remains clear from the first conversation through closeout.
Detailed scopes
Clear inclusions, assumptions, and decision points reduce ambiguity before work begins.
Cost awareness
Construction decisions are evaluated against budget, schedule, and long-term asset value.
Structured communication
Progress, risks, approvals, and changes are documented and communicated consistently.
Field coordination
Trades, materials, inspections, and decisions are sequenced around executable work.
Long-term relationships
What clients say after the project matters more than what we say before it begins.