What TG Gallagher does

TG Gallagher is a privately held mechanical contracting firm founded in 1940 and headquartered in Waltham, Massachusetts, with a secondary operating presence and 130,000 SF ISO 9001:2015 certified prefabrication facility in Andover, MA. The company designs, installs, and maintains HVAC, plumbing, and fire protection systems through four core service lines — Fire Protection, HVAC, Plumbing, and Service & Maintenance — delivered via design-build, design-assist, GMP, and mechanical prime contracting methods. TGG serves enterprise clients in healthcare, higher education, life sciences, and commercial real estate across New England (Massachusetts and Maine specifically cited), with named customers including Mass General Brigham, Beth Israel Lahey Health, Boston Children's Hospital, Maine Medical Center, Harvard University, MIT, Northeastern, Thermo Fisher Scientific, Pfizer, Dana-Farber, and Liberty Mutual.

Underlying the service delivery is a technology stack anchored by Building Information Modeling (BIM) and Virtual Design and Construction (VDC), 3D laser scanning for existing conditions, Trimble Total Station field layout, and SysQue software for prefabrication drawings. A dedicated 130,000 SF fabrication shop on over 7 acres produces prefabricated pipe racks, pump skids, bathroom pods, and multi-trade assemblies, with the company claiming 20% waste reduction versus traditional site-built methods and a work environment 7x safer than typical job sites. The Service & Maintenance division offers 24/7 emergency response, preventative maintenance, NFPA 25 compliant inspections, facility assessments, and capital planning, which together generate a recurring revenue stream alongside project-based installation work.

The business model is primarily project-based, with pricing established through competitive bidding, design-build estimates, and direct negotiation on a per-project basis; revenue streams span one-time installation contracts, recurring service agreements, and professional services for capital planning. Marketing is relationship-driven and direct — leveraging the company website, industry affiliations (AGC MA, MCAA, GBPCA, PWC), community engagement, and a co-op/internship talent pipeline rather than paid performance or channel marketing. The firm is leadership-stable and independently owned, with CEO Brian Potter (career tenure since 1982, President 1992, CEO transition), President Shawn Guertin, COO Mike Betts (joined 2004), and CFO Chris Foley (joined 2018).

Name

TG Gallagher

Legal name

TG Gallagher

Website

https://tggallagher.com

Company type

Private

Founded year

1940

Operating status

Operating

Headcount range

101–250 employees

Short description

TG Gallagher is a New England mechanical contractor founded in 1940 that designs, installs, and maintains HVAC, plumbing, and fire protection systems for healthcare, higher education, life sciences, and commercial clients across Massachusetts and Maine.

Ownership category

akta.pro rank

Headquarters

HQ city

Waltham

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Mechanical Contracting Services: Project-based revenue from HVAC, plumbing, and fire protection installation for commercial, healthcare, higher education, and life sciences facilities. Revenue is generated through various delivery methods including design-build, design-assist, GMP, and mechanical prime contracts.
2. Service and Maintenance Contracts: Recurring revenue from preventative maintenance, deferred maintenance, facility assessments, and 24/7 emergency services for existing mechanical systems.
3. Capital Planning Services: Long-term capital planning and budgeting services for facility mechanical systems evaluation and equipment replacement planning.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels4 records

Core offering

TG Gallagher is a premier mechanical contractor that designs, installs, and maintains HVAC, plumbing, and fire protection systems for healthcare, higher education, life sciences, and commercial facilities across New England. The company operates a 130,000 SF ISO 9001:2015 certified prefabrication facility and uses BIM/VDC technology to coordinate mechanical systems before construction, delivering projects via design-build, design-assist, GMP, and mechanical prime methods.

Product overview

TG Gallagher is a mechanical contractor providing integrated HVAC, plumbing, fire protection, and maintenance services for commercial, healthcare, higher education, and life science facilities. The company operates as a unified service organization with four core service lines—Fire Protection, HVAC, Plumbing, and Service & Maintenance—supported by technology capabilities including Building Information Modeling (BIM) for virtual design and coordination, and a 130,000 square foot ISO 9001:2015 certified prefabrication facility for off-site manufacturing of mechanical assemblies. These services are delivered through design-build, design-assist, GMP, and mechanical prime delivery methods across New England.

Differentiator

Problem solved

Functional benefit

Products and services

• Fire Protection

Quantifiable outcome

• 20% waste reduction through prefabrication
• +2 more outcomes

Named customers13 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core and minor.

• MMS (Modular Mechanical Solutions)coreStrategic or Co-development PartnerSister company for specialized fabrication services. MMS crafts and delivers customized mechanical solutions that complement TG Gallagher's on-site installation capabilities.
• Building PathwayscoreStrategic or Co-development PartnerWorkforce development partnership supporting selection, training, preparation, and job placement of underrepresented groups seeking careers in the mechanical construction industry. TG Gallagher employs candidates from their pre-apprenticeship program and for full-time positions.
• United States Army Reserve Private Public PartnershipminorStrategic or Co-development PartnerEmployment partnership program sharing opportunities with the veteran population and their family members.
• Helmets to Hard HatsminorStrategic or Co-development PartnerProgram connecting military veterans to careers in the construction industry, specifically supporting the veteran population and their families.

Scale indicators8 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• EMCOR Group: Largest publicly traded mechanical and electrical construction services firm in the U.S. Provides HVAC, plumbing, and fire protection across commercial, healthcare, industrial, and institutional clients — overlapping directly with TGG's core service lines and verticals, but at far greater national scale.
• APi Group: Diversified safety and specialty services platform with a sizable mechanical services and fire suppression installation business. Overlaps with TGG's fire protection service line and life-safety work but operates as a much broader holding company.
• Comfort Systems USA: National HVAC and mechanical contracting platform serving commercial and industrial customers. Competes with TGG in commercial HVAC installation and service, with broader geographic reach but less regional specialization in healthcare/life sciences.

Direct peers

• McKinstry: Mechanical, electrical, plumbing contractor and energy services firm with strong presence in healthcare, higher education, and life sciences on the West Coast. Highly comparable service portfolio including prefabrication capabilities and recurring service revenue.
• HB Mechanical: Multi-trade mechanical contractor delivering HVAC, plumbing, and specialty systems for healthcare, higher education, and commercial clients with in-house prefabrication capabilities — closely comparable mid-market peer with similar vertical focus.
• U.S. Engineering: Large mechanical contractor with deep healthcare, higher education, and life sciences expertise, including design-assist and design-build delivery. Comparable in vertical mix and integrated prefab/service offering, though operating across a wider geography.
• Southland Industries: Full-service mechanical contractor delivering HVAC, plumbing, and fire protection with significant in-house prefabrication and BIM/VDC capabilities — closely mirroring TGG's integrated service-plus-prefab model across commercial and institutional markets.
• Limbach Holdings: Specialty mechanical systems contractor focused on healthcare, higher education, and life sciences — a near-identical vertical mix to TGG. Operates design-build, design-assist, and maintenance service offerings for institutional clients, directly comparable in service model and customer base.

Regional players

• Murphy Company: Mechanical contractor serving commercial, healthcare, and institutional markets with HVAC, plumbing, and process piping — comparable service mix and customer segments to TGG, but concentrated in the Midwest/Mid-Atlantic regions.
• Harris Company: Mid-Atlantic mechanical contractor providing HVAC, plumbing, and building services to commercial and institutional clients — same service portfolio as TGG, with strong recurring service revenue emphasis, but operating in a different regional footprint.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/tggallagher
• Facebookfacebook.com/tg-gallagher-325515044153198
• LinkedInlinkedin.com/company/thomas-g-gallagher-inc

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 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 TG Gallagher