An execution-led public-infrastructure group.
Founded in 2003, Diarch Group operates as the trusted execution partner for central ministries and Bihar state departments. Twenty-two years, 248+ projects, one operating philosophy: deliver on commitment.
A quietly dependable execution partner for the public sector.
Diarch Group was founded in Patna in 2003 to bring engineering discipline and contractual integrity to public infrastructure delivery in Bihar. Two decades later, we operate across eight verticals, in every administrative division of the state and on selected central works elsewhere in eastern India.
We do not chase scale for its own sake. We pursue projects where we can apply our delivery framework end-to-end — and where our clients value predictable, documented and audit-ready execution.
Our work is judged by completion certificates, not press releases. That is the standard we are most proud of.
Mission
To deliver public infrastructure that is engineered to last, executed with integrity and documented to standard.
Vision
To be the most trusted execution partner for state and central public-infrastructure programmes in eastern India.
Promise
On every contract: transparent bidding, calibrated execution, full compliance, on-time delivery.
Twenty-two years, six defining milestones.
Each milestone reflects an inflection point — in capability, geography, or institutional trust.
Founded in Patna
Diarch Group incorporated to undertake civil works for the Bihar state government.
First Highway Project
Awarded a NH widening contract by MoRTH, marking entry into central government works.
ISO Triple Certification
Achieved ISO 9001, 14001 and 45001 certification — a first in our peer group at the time.
CPWD Class-I Empanelment
Empanelled as Class-I contractor with Central Public Works Department.
Smart City Programmes
Delivered the Patna ICCC and entered the urban-infrastructure delivery vertical.
₹ 1,840 Cr cumulative delivery
Crossed the milestone of ₹ 1,840 Cr in cumulative contracted infrastructure delivery.
The leadership that signs off on every project.
Decades of public infrastructure execution. Every major project carries a personal sign-off.
Ranjan Kumar Ojha
Chief Executive Officer
Leads Diarch Group across strategy, execution and government partnerships. Decades of hands-on experience delivering public infrastructure and large-scale civil works across Bihar.
The principles we hire for, and judge ourselves by.
Every member of the organisation — from site engineer to managing director — is held to these five operating principles.
Integrity
Transparent bidding, honest reporting and zero tolerance for compromise on contract obligations.
Excellence
Engineering rigour, calibrated quality systems and a relentless focus on delivery outcomes.
Accountability
Every project, every milestone, every line item — traceable, documented and owned.
Sustainability
GRIHA-aligned construction practices, resource efficiency and lifecycle-aware design.
Innovation
BIM-led design coordination, digital site logs and pre-engineered methods to compress delivery cycles.