SERVICES
At LLI Engineering, we offer a wide array of innovative services designed to meet and conquer today’s complex design challenges. Our dedicated team members are not only skilled professionals but are also recognized as leaders in the industry, bringing a wealth of knowledge and expertise to every project.
With LLI Engineering, you can trust that your vision will be transformed into reality through our commitment to excellence and a collaborative approach that drives success.
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HVAC & MECHANICAL ENGINEERING
LLI Engineering specializes in the design of HVAC systems for a wide range of facilities and applications, with a focus on technologically complex and mission-critical environments. Our team brings deep expertise to every project, delivering solutions that prioritize performance, efficiency, and long-term value.
We have extensive experience designing HVAC systems for telecom data centers, manufacturing and light industrial facilities, nuclear and radioactive environments, healthcare settings, and laboratories—where precision and reliability are essential.
Our approach emphasizes energy efficiency, sustainability, and optimized life-cycle costs, ensuring each system is tailored to meet the specific operational needs of our clients.
Our services include:
- HVAC System Design & Analysis
- High-Efficiency System Solutions
- Mission-Critical & Redundant System Design
- Clean Room & Laboratory HVAC Design
- Healthcare & Specialized Facility Design
- Code Compliance & Indoor Air Quality OptimizationWe are your trusted partner for mechanical systems that perform under pressure and adapt to the most demanding environments.
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ELECTRICAL ENGINEERING
We provide comprehensive Electrical Engineering services with a focus on power distribution, reliability, and cost-effective performance. From utility service to end-use equipment, we design systems that deliver efficient, dependable power for a wide variety of facility types.
We specialize in redundant power systems for mission-critical applications, including emergency and standby generators, UPS systems, and DC battery plants. Our experience spans data centers with Tier I–IV configurations, telecom facilities, and other high-demand environments where uptime is essential.
Our electrical team also performs detailed Power Quality Studies, including Arc Flash Analysis and Circuit Breaker Coordination, all in full compliance with NEC requirements. We are equipped to troubleshoot, evaluate, and optimize existing systems to improve performance and ensure safety.
Our services include:
- Power Distribution System Design
- Emergency & Redundant Power Systems
- UPS & DC Power Systems
- Tier I–IV Data Center Design
- Power Quality & Arc Flash Studies
- NEC Code Compliance & System Evaluations
- Electrical System Troubleshooting & UpgradesLLI Engineering brings precision, safety, and forward-thinking design to every electrical project—large or small.
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PLUMBING & FIRE PROTECTION ENGINEERING
LLI Engineering offers expert Plumbing and Fire Protection Engineering services, delivering comprehensive solutions for water distribution systems and fire safety in all types of facilities. Our team specializes in the design and implementation of complex systems, including dry-type fire protection systems, fire pump installations, and standby systems.
We understand the importance of minimizing construction costs and maximizing efficiency, which is why we prioritize careful coordination with other trades throughout the project lifecycle. Our goal is to ensure seamless integration and compliance with all relevant codes and standards.
Our services include:
- Plumbing System Design & Analysis
- Fire Protection System Design & Implementation
- Water Distribution System Planning
- Dry-Type Fire Protection System Design
- Fire Pump & Standby System DesignLLI Engineering is dedicated to providing safe, efficient, and cost-effective plumbing and fire protection solutions tailored to meet the specific needs of each project.
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STRUCTURAL ENGINEERING
LLI Engineering offers a full range of Structural Engineering services designed to support the integrity, safety, and performance of your project—whether it’s a simple pole building or a complex high-rise structure.
Our team is experienced in the design and analysis of diverse structural systems including foundation systems, steel, concrete, and timber framing, as well as architectural support systems. We also evaluate existing conditions and ensure long-term structural reliability.
From initial concept through final construction, we deliver practical, efficient, and code-compliant solutions tailored to each project’s unique demands.
Our capabilities include:
- Foundation Design & Analysis
- Steel, Concrete, and Timber Framing Systems
- Architectural Structural Systems
- Structural Investigation
- Structural Renovation & Retrofit DesignLLI Engineering combines innovation with deep technical expertise to bring confidence and clarity to your structural challenges.
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ARCHITECTURAL & INTERIOR DESIGN
We provide comprehensive Architectural and Interior Design services tailored to meet the unique needs of commercial, industrial, and multi-family housing projects. Our experienced team delivers thoughtful, functional, and aesthetically driven solutions that align with each client's vision, budget, and project goals.
From concept through construction, we collaborate closely with stakeholders to ensure seamless integration of design, engineering, and sustainability. Whether designing a dynamic workspace, a high-performance data center, or vibrant residential communities, LLI Engineering combines creativity with technical precision to bring each space to life.
Services include:
- Architectural Design & Planning
- Interior Space Planning & Finishes
- Code Compliance & ADA Accessibility
- Sustainable & Energy-Efficient Design Solutions
- Construction Documentation & AdministrationWith a commitment to quality, innovation, and responsiveness, LLI Engineering is your trusted partner in shaping the built environment.
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PROJECT MANAGEMENT & CONSTRUCTION ADMINISTRATION
We provide expert Project Management and Construction Administration services to guide your project from concept to completion—on time and within budget. Whether it’s a small design/build renovation or a complex data center or microgrid installation, our team has the experience and dedication to deliver results.
We specialize in coordinating multi-disciplinary teams, managing schedules and budgets, navigating permitting and compliance requirements, and ensuring construction quality every step of the way. No project is too challenging—we thrive on solving problems and driving success for our clients.
Our services include:
- Owner’s Representation & Stakeholder Coordination
- Schedule & Budget Management
- Bidding & Contractor Selection Support
- Construction Oversight & Site Visits
- Submittal & RFI Management
- Quality Control & Compliance Review
- Closeout & Punch List ServicesLLI Engineering is committed to being your reliable partner, ensuring your project moves smoothly from design through construction and beyond.
DESIGN-BUILD SERVICES
Wastewater Treatment
Telecom Cabinets and Enclosures
Design and Construction of Wastewater Treatment Facilities
LLI Engineering excels in providing Design-Build Services for wastewater treatment facilities, collaborating closely with our trusted construction partners to deliver seamless project execution.
From initial concept through to project completion, we work hand-in-hand with our clients to ensure that each facility is designed and constructed to meet the latest industry standards and regulatory requirements. Our integrated approach not only streamlines the construction process but also enhances communication, reduces costs, and delivers superior results.
Choose LLI Engineering for your next wastewater treatment project.
Design and Construction for Telecom
In partnership with LLI Construction, LLI Engineering delivers full-service design and construction of telecom cabinets and enclosures tailored to meet the unique needs of the telecommunications industry.
We are proud to serve notable clients such as Verizon, SEGRA, and Horizon Telcom, Inc. Our recent projects span the East Coast, with installations in South Carolina, North Carolina, Virginia, West Virginia, Maryland, Pennsylvania, New York, Ohio, and Tennessee.
With a focus on quality, efficiency, and innovation, LLI Engineering ensures that your telecom infrastructure is built to last and designed to perform.