Top MEP Engineering Firms in South Carolina for AEC Projects

National MEP Engineers

This is a firm that works on every South Carolina project with an emphasis on one core challenge, which is the state’s dual climate. Coastal Charleston comes with high-velocity hurricane zone requirements, while Upstate battles peak humidity that stresses mechanical systems throughout the year.

National MEP Engineers’ South Carolina-registered PEs stamp electrical, mechanical, plumbing, and fire protection sets for every project. Their work adheres to the 2021 SC Mechanical Code, 2023 National Electrical Code, and 2021 SC Fire Code. Engineering experts of the firm specify NEMA 4X enclosures, epoxy-coated coils, and marine-grade alloys to tackle salt air corrosion in the Lowcountry. Moreover, dedicated outdoor air systems effectively control humidity-driven microbial growth.

Capabilities:

• PE-stamped mechanical, electrical, plumbing, and fire protection design
• Salt-air corrosion mitigation using NEMA 4X enclosures and marine-grade alloys
• Energy modeling aligned with the 2024 SC Building Code and COMcheck approval

Sectors Serving:

• Commercial offices and retail
• Healthcare and hospitals
• Educational institutions
• Industrial and manufacturing facilities
• Hospitality and government buildings

Optima Engineering

Optimal Engineering operates its South Carolina office out of Greenville, which gives the firm direct reach into the Upstate’s healthcare and manufacturing corridor. The mechanical team designs HVAC systems for data centers, laboratories, and clean rooms, taking into account that these spaces need tight humidity and pressure control in a state like South Carolina. This state’s humidity makes dehumidification management key for Optima’s data center and laboratory clients.

Electrical engineers at the firm deal with arc flash studies, power quality analysis, and photometric design. The plumbing group is responsible for engineering hot- and cold-water systems across the Carolinas. Fire protection rounds out their offering with standpipe, sprinkler, and fire pump design.

Capabilities:

• HVAC design for laboratories, data centers, and clean rooms
• Arc flash, power quality, and photometric analysis
• Fire pump design and sprinkler system specification

Sectors Serving:

• Healthcare and medical centers
• K-12 schools and higher education
• Commercial and multifamily properties

DWG Consulting Engineers

DWG has worked from its Mount Pleasant office since 1991. That gives the organization over three decades of hands-on experience with Charleston’s coastal conditions. Currently a 100% employee-owned firm with offices in Greenville and Mount Pleasant, DWG renders mechanical, electrical, plumbing, and fire protection engineering under a comprehensive suite.

This company has grown into the largest locally owned MEP firm in South Carolina, tripling in size since 2008. Experts at DWG Consulting Engineers design systems curated to meet code while standing up to the region’s storm exposure and heavy drainage requirements. On top of that, this firm ties this approach directly to its sustainability commitments. Charleston roots give DWG the firsthand knowledge of flood elevation and hurricane-rated electrical protection.

Capabilities:

• Mechanical, electrical, plumbing, and fire protection engineering under one firm
• Stormwater and high-intensity rainfall drainage design
• LEED-focused sustainable systems engineering

Sectors Serving:

• Coastal commercial and mixed-use development
• Multifamily and residential communities
• Institutional and municipal projects

Gunderson Engineering

Since 2014, Gunderson Engineering has completed over 185,000 projects across the USA. Its MEP team now also serves York County, along with the entire state of South Carolina. This firm has licensed engineers in 23 states, providing South Carolina clients with access to a broad bench of HVAC, plumbing, and electrical designers.

The mechanical team of Gunderson focuses on thermal comfort analysis and energy modeling, while the electrical team handles power distribution, emergency systems, and fire alarm design. The organization also publishes market-specific guidance for cities across York County, from Fort Mill to Rock Hill, tailoring MEP suggestions to each community’s building stock. Gunderson also designs pool mechanical systems, a unique niche that only a few MEP firms offer.

Capabilities:

• HVAC design, thermal comfort analysis, and energy modeling
• Power distribution, emergency power, and fire alarm design
• Structural redline and peer review services

Sectors Serving:

• Residential and multifamily housing
• Healthcare and education facilities
• Government and municipal buildings

HDR

HDR’s approach to MEP design is just one part of a much bigger, employee-owned engineering practice with a footprint across the Southeast. This company’s mechanical engineers lean on computational fluid dynamics modeling to test temperature, airflow, and contaminant movement before construction starts. This data-driven method helps catch problems early.

On the other hand, its electrical team performs short circuit analysis, arc flash calculations, and standby power design. HDR’s plumbing and specialty gases group handles lab waste, medical gases, and fire suppression systems for complex healthcare and science facilities. This firm combines this technical depth with specialized instrumentation and controls engineers who consolidate building systems through a single operator interface.

Capabilities:

• Computational fluid dynamics modeling for airflow and thermal performance
• Short circuit analysis, arc flash calculations, and standby power design
• Medical gas, lab waste, and specialty plumbing systems

Sectors Serving:

• Healthcare, science, and technology facilities
• Government and civic buildings
• Data centers and mission-critical facilities

IMEG Corp

The final name in this list is IMEG Group, which holds three international ASHRAE Society Technology awards, the highest recognition in mechanical engineering. The firm leadership also helped write the ASHRAE 90.1 energy standards used in the majority of US energy codes. This standard-writing role shows up in South Carolina projects through geothermal systems, central plant design, and energy recovery strategies meant for lasting efficiency.

IMEG’s mechanical specialties extend to chilled beam systems, industrial ventilation, and building automation. Its broader practice spans electrical, plumbing, fire protection, and technology design. Because IMEG runs active projects across South Carolina, it gives the organization direct familiarity with the state’s permitting and code environment. This company tracks new ASHRAE guidance, such as Standard 241, addressing airborne disease risk in high-occupancy buildings.

Capabilities:

• Central plant, geothermal, and chilled beam mechanical systems
• ASHRAE 90.1-informed energy modeling with LEED and WELL certification support
• Building automation systems and net-zero energy design

Sectors Serving:

• Healthcare and higher education
• Industrial and manufacturing facilities
• Sports, recreation, and hospitality