What Kelson does

Kelson is a tier-one mechanical contracting, engineering, and service company founded in 1944 as Geo. A. Kelson Company Limited and now operating as Kelson Mechanical Inc. The firm designs, installs, and maintains mechanical infrastructure — including HVAC, plumbing, sheet metal, building automation, medical gas systems, and energy management — for complex institutional, commercial, and industrial buildings. Core verticals served are healthcare (acute care hospitals, cancer centres, long-term care facilities), education/universities (research labs, residences, athletic facilities), government/civic (courthouses, correctional facilities, transit), and commercial office. The company operates from a head office in Sharon, Ontario, with regional offices in Kingston (Kelson Mechanical Eastern Inc.) and the Greater Toronto Area, and has executed projects extending into the Northwest Territories.

The company's service portfolio spans the full project lifecycle: design services (Design-Build, Design-Assist, Integrated Project Delivery, Modular Design, BIM using Revit/Navisworks/Autodesk Fabrication), construction (preconstruction, lean construction, manufactured/modular construction, commissioning), service and maintenance (24/7 emergency service via Kelson Service Inc., preventative maintenance, facility management), and specialized energy solutions (ASHRAE-level energy audits, retro-commissioning, central plants and district energy, biomass, cogeneration/CHP, geothermal). In-house prefabrication and — following the May 2022 acquisition of JC Rogers Sheetmetal — in-house sheet metal manufacturing support BIM-enabled modular delivery.

Revenue is generated primarily through project-based construction contracts ranging from $10M to $450M+ in value, won via competitive tendering or negotiated design-build/IPD arrangements, supplemented by recurring service and maintenance revenue. Customers include William Osler Health System, Royal Ottawa Hospital, Southlake, Sunnybrook, York University, Sanofi Pasteur, and Stanton Territorial Hospital. Distribution is direct: prime contractor or subcontractor to general contractors (e.g., Ellis-Don) and consortiums (e.g., Boreal Health Partnership, Healthcare Infrastructure Company of Canada). The company is privately held, third-generation family-run, employee-owned, with 251-500 employees, and pursues a stated "build, grow and acquire" growth strategy actively soliciting acquisitions in HVAC, plumbing, electrical, service/maintenance, and consulting engineering.

Name

Kelson

Legal name

Kelson Mechanical Inc.

Website

https://kelson.on.ca

Company type

Private

Founded year

1944

Operating status

Operating

Headcount range

251–500 employees

Short description

Kelson is a tier-one Canadian mechanical contracting, engineering, and service firm founded in 1944 that designs, installs, and maintains HVAC, plumbing, and energy systems for healthcare, educational, government, and commercial facilities, primarily in Ontario.

Ownership category

akta.pro rank

Headquarters

HQ city

Ottawa

HQ country

Canada

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Construction Contracts: Project-based mechanical systems installation contracts for new construction and major renovations in ICI sector. Revenue earned through competitive tendering and negotiated contracts on projects ranging from $10M to $450M+ in construction value.
2. Service and Maintenance: 24-hour emergency service, preventative maintenance, and facility management services for existing mechanical systems. Provides recurring service revenue from established client relationships.
3. Acquisitions: Growth strategy involving acquisition of complementary businesses in HVAC, plumbing, electrical, service/maintenance, and consulting engineering sectors to expand capabilities and market presence.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Kelson is a mechanical contracting company that designs, installs, and services HVAC, plumbing, building automation, and energy management systems for institutional and commercial facilities. The firm delivers projects through design-build, design-assist, Integrated Project Delivery (IPD), BIM, and prefabrication methods, with a primary focus on healthcare, education, and government clients. It also provides ongoing service, maintenance, and energy optimization for the systems it installs.

Product overview

Kelson is a tier-one mechanical contracting, engineering, and service company providing comprehensive building mechanical systems. The company operates as a single unified service portfolio organized around the project lifecycle: Design services (Design-Build, Design-Assist, Integrated Project Delivery, Modular Design, BIM), Construction services (preconstruction, lean construction, modular construction, commissioning), Service & Maintenance (24/7 emergency service, preventative maintenance, facility management), and specialized Energy services (energy audits, central plants, biomass, cogeneration, geothermal). The company also grows through strategic acquisitions of complementary mechanical businesses. All offerings center on HVAC, plumbing, and building automation systems for institutional, commercial, and industrial facilities.

Differentiator

Problem solved

Functional benefit

Products and services

• HVAC System Design and Installation Design, fabrication, and installation of heating, ventilation, and air-conditioning systems for institutional and commercial buildings, delivered primarily to healthcare, education, and government facility owners in Ontario.
• Plumbing Systems
• Building Automation and Energy Management
• Design-Build and Design-Assist Services
• Integrated Project Delivery (IPD) and BIM Services
• Off-Site Prefabrication
• Mechanical Service and Maintenance

Quantifiable outcome

• 75+ years of continuous operation as third-generation family business
• +3 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Ten partnerships are on record, tiered core and minor.

• Dalton Engineering and ConstructioncoreStrategic or Co-development Partner · 30 October 2023Kelson teamed up with Dalton Engineering as construction manager for the St. Anne's School conversion project in Aurora. Kelson provided mechanical solutions while Dalton oversaw the overall project management and construction standards.
• Boreal Health PartnershipcoreStrategic or Co-development Partner · 30 October 2018Kelson partnered with Boreal Health Partnership for the Stanton Territorial Hospital project, which included Bird/Clark Joint Venture as design/build construction manager and Carillion Canada as FM provider.
• Crossey Engineering LimitedcoreTechnology or IntegrationKelson collaborated directly with Crossey Engineering as the engineering partner for Stanton Territorial Hospital, assisting in the design process and lending mechanical construction expertise.
• Hidi Rae Consulting EngineerscoreTechnology or IntegrationKelson collaborated with Hidi Rae Consulting Engineers on the Waypoint Centre for Mental Health Care project, assisting in design process and contributing mechanical construction expertise.
• Ellis-DoncoreStrategic or Co-development PartnerLong-standing partnership with Ellis-Don on major P3 hospital projects including William Osler Health Centre, Royal Ottawa Hospital, and Sunnybrook Hospital Wellspring Centre donation project.
• Parkin Architects LimitedcoreStrategic or Co-development Partner15+ year relationship working together on P3 hospital projects including Southlake Hospital redevelopment, Royal Ottawa Hospital, William Osler Hospital, and New Oakville Hospital.
• HH Angus and Associates LimitedcoreStrategic or Co-development PartnerLong-term partnership spanning several decades on mechanical contracting projects where HH Angus provides mechanical design and Kelson serves as installing mechanical contractor.
• The Mitchell Partnership Inc. (TMP)coreStrategic or Co-development PartnerClose working relationship for 20+ years on hospital projects including William Osler Hospital and Royal Ottawa Hospital under provincial government procurement plans.
• HTS Engineering Ltd.minorChannel Partner/ Reseller/ DistributorSupplier relationship spanning 20+ years where HTS Engineering has supplied hundreds of millions of dollars worth of HVAC equipment and controls to Kelson projects.
• Healthcare Infrastructure Company of CanadacoreStrategic or Co-development PartnerKelson was part of The Healthcare Infrastructure Company of Canada consortium for the Royal Ottawa Hospital project, responsible for mechanical design and construction.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Black & McDonald: One of Canada's largest integrated mechanical, electrical, and facility services contractors. Directly comparable to Kelson as a multi-trade ICI mechanical contractor with national footprint, design-build delivery, and recurring service/maintenance revenue across healthcare, institutional, and government clients.
• Modern Niagara Group: Major Canadian mechanical and electrical contractor serving commercial, institutional, and industrial clients. Directly comparable to Kelson in HVAC, plumbing, building automation, and energy services with similar Design-Build/IPD delivery and a national service/maintenance book.
• Ainsworth: Canadian-based mechanical, electrical, and technical services firm with national reach. Closely comparable to Kelson across HVAC, building automation, energy retrofits, and 24/7 service — though typically larger and more national in footprint.
• Plan Group: Toronto-based mechanical and electrical contractor focused on complex commercial, institutional, and healthcare projects. Direct peer in Design-Build delivery, BIM, prefab, and ICI mechanical scope in the Ontario market where Kelson is concentrated.

Regional players

• Quirion Metal: Quebec-based mechanical/sheet metal contractor serving commercial and institutional clients. Comparable in mechanical contracting and sheet metal fabrication, but operates primarily in Quebec rather than competing head-to-head in Ontario.

Broad incumbents

• Johnson Controls: Global HVAC equipment OEM and building automation/services incumbent. Comparable as a supplier/competitor in HVAC equipment, controls, and energy services for institutional buildings, though at vastly greater scale and with proprietary product lines rather than pure contracting.
• Trane Technologies: Global HVAC and building services incumbent. Overlaps with Kelson in HVAC equipment supply, energy services, and building decarbonization retrofits — a competitor and partner on larger institutional projects, though not a direct contracting peer.
• Carrier Global: Global HVAC, refrigeration, and building automation incumbent. Comparable in refrigeration/HVAC equipment, controls, and service offerings that overlap with Kelson's mechanical contracting and energy services, but operating as a manufacturer/service franchise rather than a contractor.

Others

• EllisDon: Major Canadian general contractor and P3 developer (long-standing Kelson partner on P3 hospitals including William Osler, Royal Ottawa, and Sunnybrook). Comparable as a project owner/partner shaping the same P3 healthcare pipeline Kelson targets, though EllisDon is a GC rather than mechanical specialist.
• PCL Constructors: One of Canada's largest general contractors with significant ICI and healthcare/P3 work. Comparable as a project partner/competitor on the same institutional project pipeline that drives Kelson's mechanical scope, though at a much larger and more diversified scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries3 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 Kelson