925.891.4220

CA CONT LICENSE # 977589

Since 1999 Trinity Devco founded by Jim  Slevin  has built Apartment Complexes, High End Custom Homes in Fairfield CA, Production Housing, Commercial Construction, Production Land Development, Home or Multi-Family Restoration along with numerous smaller contracts including Home Remodel, Room Additions and Commercial Tenant Improvements in the Fairfield CA, & Surrounding San Francisco area.


Three words come to mind to describe Trinity Devco Inc.: Design / Builder / Owner.  You see we at Trinity strive to partner with our customers.  Whether contracted as Design Build Team, or Builder for Owner, or in Partnership with others, we offer no surprises and the ability to build it right the first time.

Trinity has a proven track record in Upper Project Management, and Project Supervision from Land Acquisition, Forward Planning with Project Entitlements, and Land Development through Home or Multi Family Development.  Complete Project Development while maintaining a high proficiency in all computer applications with complete and accurate systems of Construction Documentation.

All large or small Trinity projects can include the Design/ Build agreement. Trinity works well with selected Architects for Design Build Projects.


Custom Home / Estate Home Development Fairfield CA
Commercial Fairfield CA
Multi-Family Fairfield CA
Single Family Fairfield CA
Civil Construction Fairfield CA
Large Remodel / Room Addition Fairfield CA
In-House Trinity Crewman Fairfield CA
Design Build Fairfield CA
Consultant Services Fairfield CA
Project Development Fairfield CA