Business Details
43 Years
experience
Federal Infrastructure Solutions Experts
Founded in 1983, Onyx Group has established itself as a trusted partner in federal facility planning, architectural consulting, and program support. With over four decades of specialized experience, our multidisciplinary team of certified architects, planners, and engineers delivers mission-critical solutions for federal agencies, including the Department of Defense, Homeland Security, and Transportation. Our approach integrates strategic planning, data-driven design, and compliance with federal standards to ensure projects align with long-term operational goals. We prioritize client collaboration, beginning with a deep understanding of objectives and constraints to craft tailored solutions that enhance functionality and sustainability.Our commitment to excellence is reflected in 125+ completed federal projects and a track record of exceeding regulatory expectations. By combining cutting-edge technology with traditional architectural principles, we shape environments that stand the test of time while addressing evolving security and infrastructure needs. Our teams expertise in NAVFAC, USACE, and AFCEC contracts underscores our leadership in complex federal engagements. We empower clients through transparent communication, innovative problem-solving, and a focus on delivering value across every project phasefrom initial planning to final implementation.
Services
Master Planning
Architecture
Construction Management
Environmental Consulting
Landscape Architecture
Interior Design
Technology Solutions
GIS Services
Facility Planning
Program Support
Details
- Year established: 1983
Highlights and features
- We have over 40 years of experience in federal architecture and planning.
- Our team includes certified planners, architects, and construction specialists.
- We specialize in NAVFAC, USACE, and AFCEC contract compliance.
- 125+ completed federal projects demonstrate our mission-focused expertise.
- We integrate innovative technology with proven engineering principles.
What people say
Exceeded federal standards
Strategic, data-informed planning
Responsive team
Actionable solutions
Technical precision
Services
Master Planning
We develop mission-aligned master plans for military and federal installations using data-driven methodologies. Our approach optimizes land use, facility lifecycle management, and operational efficiency while meeting federal compliance requirements. Clients benefit from scalable solutions that address current needs and future-readiness.
Architecture
Our architectural services focus on creating mission-ready environments that balance functionality and aesthetics. We specialize in federal facility design compliant with NAVFAC, UFC, and DoD standards. Projects emphasize durability, security, and adaptability for evolving defense infrastructure demands.
Construction Management
We provide comprehensive construction inspection services ensuring precision, safety, and regulatory adherence throughout project execution. Our team monitors timelines, budgets, and quality control to meet federal specifications while maintaining transparency with stakeholders.
People
Theresha Diallo
CEO
Theresha Diallo leads Onyx Group with 30+ years of experience in federal infrastructure planning. Her expertise in NAVFAC contracts and strategic facility management drives the firms mission-focused approach.
Philip Rush
Partner
Philip Rush, a licensed architect, specializes in federal facility compliance and sustainable design. With 25+ years in military infrastructure, he ensures projects meet rigorous technical and environmental standards.
Questions
What federal agencies do you work with?
We serve the Department of Defense, DHS, DOT, DOE, and GSA, among other federal clients.
How long has The Diallo Group been in business?
Founded in 1983, we have over 40 years of experience in federal infrastructure planning.
What services do you offer?
We provide master planning, architectural design, construction management, environmental consulting, and GIS services.
Are you certified for federal contracts?
We hold multiple federal contract vehicles including IDIQs with NAVFAC, USACE, and AFCEC.
What geographic areas do you serve?
We operate nationwide with offices in Virginia, Florida, California, and Hawaii.
