Business Details
23 Years
experience
Emergency
services
Your Trusted Civil Engineering Partner in Honolulu
Manthos Engineering combines creativity, technical expertise, and modern client engagement methods to deliver civil engineering projects on time and within budget. Established in 2003, we specialize in serving public and private clients across Hawaii, including the Department of Transportation, Department of Health, and Honolulu Housing Authority. Our teams deep understanding of regulatory requirements and commitment to exceeding project expectations ensures compliance with all applicable codes while maximizing return on investment.With decades of collective experience in highway administration, construction management, and environmental compliance, we provide end-to-end solutions from initial survey to final inspection. Our focus on innovation, safety, and sustainable practices addresses complex challenges in infrastructure, land development, and disaster recovery. By maintaining membership in technical societies and adhering to industry best practices, we ensure our clients benefit from cutting-edge methodologies and proven project execution strategies.
Services
Project Management
Construction Management
Traffic Studies
Erosion Study and Control
Highway and Freeway Rehabilitation
Project Design
Environmental Impact Studies
Land and Site Reclamation
Structural Restoration
ADA Compliance Solutions
Details
- Year established: 2003
Highlights and features
- We have over 20 years of experience working with Hawaii government agencies.
- Our team includes engineers with decades of highway and infrastructure experience.
- We ensure projects meet all applicable codes and standards.
- We focus on adding value to maximize your ROI.
- We manage projects from initial survey to final inspection.
Services
Project Management
We provide end-to-end project management for civil engineering initiatives, ensuring seamless coordination from planning to completion. Our team guarantees adherence to timelines, budgets, and regulatory standards while delivering solutions tailored to client needs. With expertise in public infrastructure and private development, we optimize project outcomes through proactive risk mitigation and stakeholder communication.
Construction Management
Our construction management services ensure quality control and compliance across all project phases. We oversee contractors, materials, and timelines to meet specifications while maintaining safety protocols. With experience in highway upgrades and environmental remediation, we deliver complex projects efficiently, whether managing microtunneling operations or asphalt overlays for major roadways.
Traffic Studies
We conduct comprehensive traffic studies to improve roadway efficiency and safety. Our engineers analyze flow patterns, develop mitigation strategies, and design infrastructure upgrades. From urban intersections to highway systems, we implement data-driven solutions that reduce congestion and enhance mobility for drivers and pedestrians while aligning with municipal planning goals.
Environmental Impact Studies
We evaluate potential environmental effects of development projects to ensure regulatory compliance and sustainable practices. Our studies cover land use, water quality, and habitat preservation, providing actionable recommendations for minimizing ecological footprints. This service supports clients in obtaining permits while balancing infrastructure needs with environmental stewardship.
Highway Rehabilitation
We specialize in restoring aging highway infrastructure through targeted rehabilitation strategies. Our work includes concrete replacement, pavement management, and drainage improvements to extend roadway lifespans. By employing advanced materials and construction techniques, we enhance safety and durability for critical transportation corridors like Honolulus Airport Viaduct.
People
Pericles M. Manthos
Member Manager, Civil Engineer
Founder with 30+ years of experience in highway administration and infrastructure projects. Former State Highways Administrator overseeing $200M+ annual programs and FEMA-certified for disaster response.
Martin Okabe
Project Manager
40+ years of engineering expertise, including 9 years as Hawaii DOT Oahu District Engineer. Led public-private partnerships for intelligent transportation systems and managed major highway maintenance operations.
Jianren Lei
Project Manager
27-year veteran in civil engineering with specialized skills in landfill design, geotechnical investigations, and ADA compliance. Recipient of the Dick Harding Technical Excellence Award for environmental engineering work.
Christopher Firby
Project Engineer
14 years of construction inspection experience, including Connecticut DOT projects. Managed Hawaiis Ft. Weaver Road Widening and Kalaheo Avenue sewer projects with expertise in microtunneling and utility coordination.
Tanya Bayados
Construction Management
Experienced in DOT highway projects across Oahu and Maui. Specializes in project closeout processes, change order reviews, and inspection services for tsunami damage repair and shoreline improvements.
Questions
What civil engineering services do you offer?
We provide project management, construction oversight, traffic studies, highway rehabilitation, environmental assessments, and ADA compliance solutions.
Do you work with government agencies?
Yes, we collaborate extensively with Hawaii DOT, City & County of Honolulu departments, and federal entities on infrastructure projects.
How do you ensure project compliance?
Our team follows all local, state, and federal regulations while maintaining industry best practices and safety standards throughout project execution.
Can you handle emergency infrastructure repairs?
Yes, we have experience in disaster recovery projects including post-Hurricane Iniki restoration and emergency highway repairs.
What makes your firm different?
Our deep local knowledge, decades of government contracting experience, and focus on maximizing client ROI through value engineering set us apart.
