Cost-effective Solutions For Every Project

At ONeil Engineering Services, Inc., our experienced mechanical, electrical, and plumbing engineers have a reputation of efficiency and resourcefulness, and they leverage state-of-the-art tools and software to provide our clients with customized analysis and design. Our team delivers innovative and cost-effective solutions for every project, in every market sector.

Our clients can expect our engineers to work closely with them to gain a thorough understanding of the scope and objectives for their proposed projects. This collaborative approach allows our engineers to provide the most comprehensive and cost-effective proposal to align with every client’s scope, schedule, and budget.

With ONeil Engineering Services, Inc., you’re confident you’re working with a premier provider of expert, specialized, and customized services to suit your specific, individual needs.


We offer consultation and design
engineering services in these areas:

  • Mechanical
  • Electrical
  • Plumbing
  • Gas Piping

Project types include:

  • Commercial construction
  • Tenant up-fits
  • Restaurants
  • Multi-family residential developments
  • Renovations and adaptive reuse of historical sites
  • Data Centers

Core Competencies

Mechanical and Plumbing
  • Building HVAC systems
  • HVAC building load and energy analysis
  • Computer room AC systems
  • Plumbing systems
  • Natural gas and propane design
  • Failure analysis and equipment studies
  • 3D coordination drawings for BIMSystem design
  • Evaluation of existing building mechanical systems
Critical Facilities
  • HVAC & process piping
  • 3D coordination drawings for BIM
  • Fuel storage & distribution
  • Thermal energy storage
  • Humidity control systems
  • Critical cooling plant and distribution systems
  • Building automation systems
  • Chilled water and boiler plants
  • Computer room AC systems
  • Building load and energy analysis
  • Medical gas design
Non-Critical Facilities
  • Building HVAC systems
  • Premium efficiency heat pump systems
  • Geothermal systems
  • Water source heat pump systems
  • Domestic, sanitary and storm sewer piping
  • System design
  • Hot water storage system design
  • Hot water storage heating
  • Plumbing systems
  • HVAC system commissioning
  • Emergency power supply systems
  • Power monitoring & control systems
  • Power system studies and Analysis
  • Energy code/COMCheck
  • Fire alarm and detection systems
Critical Facilities
  • Emergency power supply systems
  • Uninterruptible power supply (UPS) systems
  • Critical facilities electrical distribution
  • SCADA/PLC control systems
  • Power monitoring & control systems
  • Branch circuit monitoring systems
  • Advanced Power System studies
  • Short circuit
  • Protective device coordination
  • Arc-Flash hazard risk analysis
  • Load flow & voltage drop
  • Neher-McGrath cable heating
  • Systems reliability
  • Harmonic analysis
  • Uptime tier analysis
  • Critical systems commissioning
Non-Critical Facilities
  • Low and medium power distribution systems
  • Lighting design
  • Interior and exterior lighting design photometric calculations
  • Energy Code/COMCheck
  • Fire alarm and detection systems
  • Structured cabling systems

Additional Competencies

  • Third-party inspections for MEP installations
  • Mission-critical applications (design and commissioning)
  • Data center environments (design and commissioning)