W. B. Guimarin & Co., Inc.

What W. B. Guimarin & Co., Inc. does

W. B. Guimarin & Co., Inc. (WBG) is a fourth-generation, family-owned mechanical contractor founded in 1903 and headquartered in Columbia, South Carolina. The company provides full-service commercial HVAC, plumbing, and mechanical services to healthcare, education, commercial, manufacturing, and institutional facilities throughout South Carolina. Its operations are organized across two divisions: Construction, which handles HVAC installation, new construction plumbing, medical gas installation, sheet metal fabrication, and pipe prefabrication; and Service, which delivers 24/7 emergency response, preventative maintenance plans, and strategic facilities management. WBG contracts both directly with end users and indirectly through general contractors and construction managers, and it operates three regional offices covering the Midlands (Columbia), Upstate (Greenville), and Lowcountry (North Charleston) markets.

WBG's underlying technology is conventional for a modern mechanical contractor rather than technologically differentiated. The company employs 3D BIM software for system design, Autobid estimating software for pricing work directly from construction documents, and an in-house sheet metal fabrication and pipefitting prefabrication shop. Its core differentiators are operational rather than technical: a 120-year operating history, ASHE Health Care Construction Certificate holders for healthcare work, factory-trained technicians across major HVAC brands, and a documented safety record of over one million man hours without a Lost Time Accident achieved twice in the past decade.

The company's revenue model combines project-based construction contracts (one-time) with recurring service and maintenance revenue (subscription-style) and facilities management engagements. Named customers span Prisma Health, Lexington Medical Center, University of South Carolina, Clemson University, Scout Motors, Becton Dickinson, Blackbaud, Marriott, and TD Bank, with leadership provided by President C. Carroll Heyward, Jr., and Executive Vice President/CFO Sidney Heyward Rex, representing the fourth generation of Heyward family ownership since the 2015 leadership transition.

Name

W. B. Guimarin & Co., Inc.

Legal name

W.B. Guimarin & Co., Inc.

Website

https://wbguimarin.com

Company type

Private

Founded year

1903

Operating status

Operating

Headcount range

101–250 employees

Short description

W. B. Guimarin & Co., Inc. is a fourth-generation, family-owned mechanical contractor providing commercial HVAC, plumbing, and mechanical services across South Carolina, serving healthcare, education, manufacturing, and institutional facility owners since 1903.

Ownership category

akta.pro rank

Product category

Mechanical Contracting and HVAC Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Building Equipment Contractors (2382), Architectural, Engineering, and Related Services (5413)

SIC

Construction - Special Trade Contractors (1700), Services-Engineering Services (8711)

akta.pro primary industry

HVAC & Refrigeration Contracting (IMAFALAB)

Keywords

• Commercial HVAC services
• Mechanical contracting
• Plumbing installation
• Facilities management
• Industrial process cooling

Headquarters

HQ city

Columbia

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure, Supply Chain

Revenue model

1. Construction Contracts: Project-based revenue from commercial HVAC, plumbing, and mechanical construction services for healthcare, education, commercial, manufacturing, and institutional facilities. Contracts are awarded through competitive bidding on new construction and renovation projects.
2. Service and Maintenance: Recurring revenue from 24/7 emergency service, preventative maintenance plans, and strategic facilities management. Services include HVAC repairs, equipment replacement, and facility optimization.
3. Small Projects and Retrofits: Revenue from retrofits, new construction additions, and replacement projects under the Service division, including data center/server room work, chiller services, and exhaust systems.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

W. B. Guimarin & Co., Inc. is a full-service mechanical contractor providing commercial HVAC installation, new construction plumbing, medical gas installation, sheet metal fabrication, pipe prefabrication, and process cooling for commercial, industrial, healthcare, education, and institutional facilities across South Carolina. The company also operates a Service division delivering 24/7 emergency HVAC and plumbing repair, preventative maintenance plans, and strategic facilities management. Pre-construction services include 3D BIM design, engineering assist, and estimating support.

Product overview

W. B. Guimarin & Co., Inc. is a full-service mechanical contractor offering a unified portfolio of construction and service solutions for commercial, industrial, and institutional facilities. The company operates through two primary divisions: Construction (new installation, HVAC, plumbing, medical gas, sheet metal fabrication, pipe prefabrication) and Service (preventative maintenance, emergency repairs, facilities management). Core offerings include commercial HVAC installation, new construction plumbing, medical gas installation, process cooling, temperature/humidity control, and strategic facilities management. The company leverages in-house fabrication capabilities to deliver projects with improved quality and faster delivery timelines.

Differentiator

Problem solved

Functional benefit

Products and services

• Construction Services Full-service mechanical construction including HVAC installation, new construction plumbing, medical gas installation, sheet metal fabrication, and pipe prefabrication for commercial, cultural, education, healthcare, and industrial facilities throughout South Carolina.
• HVAC and Plumbing Service and Maintenance Emergency and proactive service for commercial HVAC and plumbing systems including preventative maintenance plans, emergency repairs, and 24/7 on-call support for facility owners across South Carolina.
• Facilities Management Strategic facilities management including facility assessments, operating cost optimization, capital budgeting, and energy reduction strategies for commercial and industrial facilities.
• Pre-Construction Services Optimized HVAC and plumbing design using 3D BIM software, engineer assist services, and precise project estimating using Autobid software to support design/build project delivery.
• Sheet Metal Fabrication and Pipe Prefabrication In-house sheet metal fabrication and pipefitting prefabrication shop operated by skilled technicians using cutting-edge technology to improve efficiency, quality, and shorten project lead times.

Quantifiable outcome

• Over 100 projects completed on time in the last 5 years
• +3 more outcomes

Named customers19 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

13 partnerships are on record, tiered core, minor, industry and community.

• Prisma HealthcoreStrategic or Co-development PartnerPartnership with Prisma Health for in-house Employee Wellness Center at WBG's Columbia office. Provides streamlined onboarding with fit for duty exams, DOT physicals, medical screenings, and workplace wellness resources. Prisma Health staff run the on-site medical facility.
• M.B. Kahn ConstructioncoreStrategic or Co-development PartnerPartnering on Scout Motors Inc. Training Center project - a 32,000 sq ft EV manufacturing training facility in Blythewood, SC
• Utt ConstructioncoreStrategic or Co-development PartnerPartnering on HVAC upgrade project for Becton Dickinson (BD) manufacturing site in Sumter, SC
• Thompson Turner ConstructionminorStrategic or Co-development PartnerGeneral contractor partner on various construction projects; recognized WBG foreman Stephen Ray with safety award
• ASHRAEindustryOthersIndustry membership and technical standards organization for HVAC industry. WBG engineers and technicians participate in ASHRAE activities.
• ACCA (Air Conditioning Contractors of America)industryOthersIndustry association membership for HVAC contractors providing training, certification, and industry advocacy.
• ABC Carolinas (Associated Builders and Contractors)industryOthersConstruction industry association membership promoting merit shop construction and providing training and safety recognition.
• Carolinas AGC (Associated General Contractors of America)industryOthersConstruction industry association providing advocacy, training, and safety program recognition.
• SMPS Palmetto ChapterindustryOthersSociety for Marketing Professional Services chapter providing access to school district leaders, municipalities, and facility owners in South Carolina's A/E/C community.
• US Green Building CouncilindustryOthersIndustry association promoting sustainable building practices and LEED certification.
• Central Carolina Community FoundationcommunityOthersCommunity foundation receiving financial and in-kind support from WBG as part of corporate responsibility initiatives.
• United Way of MidlandscommunityOthersCommunity nonprofit receiving financial and in-kind support from WBG.
• Palmetto Health FoundationcommunityOthersHealthcare foundation receiving financial and in-kind support from WBG.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Limbach Holdings: Public mechanical contractor providing HVAC, plumbing, and building automation services across multiple U.S. regions. Highly comparable business model combining construction, service, and maintenance with design-assist capabilities, serving healthcare, education, and commercial clients.

Broad incumbents

• Comfort Systems USA: Large national mechanical contractor providing HVAC, plumbing, piping, and building automation services. A scaled incumbent with broader geographic reach and similar service offerings, including fabrication and service/maintenance.
• EMCOR Group: Large publicly-traded provider of mechanical and electrical construction, building services, and industrial services. Competes with WBG on commercial HVAC, plumbing, and large healthcare/industrial projects, with national footprint and significantly greater scale.
• APi Group: Public safety, security, and specialty services company with significant mechanical and HVAC service exposure. Operates as a holding company of specialty contractors serving similar institutional and commercial end markets.

Regional players

• John W. Danforth Company: Multi-state mechanical contractor based in New York/Ohio serving the Northeast and Mid-Atlantic. Direct comparable in business model (HVAC, plumbing, service) with similar regional concentration strategy, though operating in different geographies.
• Harris Company (Harris Mechanical): Regional mechanical contractor providing HVAC, plumbing, and building services primarily in the Mid-Atlantic and Southeast. Comparable in customer mix (commercial, healthcare, education) and integrated construction-plus-service model.
• Binsky & Snyder: Mid-Atlantic mechanical and plumbing contractor serving commercial, industrial, and institutional clients. Similar mid-sized specialty contractor profile with comparable construction and service offerings.
• Poole & Kent Corporation: Southeast-focused mechanical contractor (now part of Southland Industries) with deep regional presence. Direct comparable given Southern concentration and similar healthcare, education, and government client base.

Others

• M.B. Kahn Construction: South Carolina-based general contractor partnering with WBG on the Scout Motors EV training center project. Adjacent competitor (general contracting) and active collaborator; illustrates WBG's competitive set within the SC construction ecosystem.
• Thompson Turner Construction: Southeast-focused general contractor that has partnered with WBG on multiple projects. While a downstream GC partner rather than direct competitor, they hire mechanical subcontractors like WBG and represent the broader SC A/E/C competitive landscape.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/w--b--guimarin-&-co--inc-
• Xx.com/wbguimarin

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about W. B. Guimarin & Co., Inc.