DESIGN-BUILD
Commercial HVAC design-build, under one contract
Engineering, fabrication, installation, and commissioning of mechanical systems for office towers, plants, rental multi-residential buildings, and critical environments (data centers and indoor greenhouses). Turnkey projects delivered with a controlled schedule, an optimized budget, and a single point of contact.
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- Projects deliveredAcross Canada since 1927
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- Certified specialistsLEED, CEM, CMVP, RCx, RBQ, CMMTQ
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- Certified engineersIn Quebec and across Canada
What you get
One mechanical contractor, fully integrated management
An approach built for procurement teams that have already measured the impact of a fragmented mechanical scope — and chosen an integrated, clear, controlled solution.
Single point of accountability
One contract, one schedule, one dedicated point of contact for your project. We deliver smooth, uninterrupted execution, adapted to the requirements of every sector.
Engineering, fabrication, install — in-house
300+ certified engineers and technologists under one roof. LEED, CEM, CMVP, RCx, RBQ, CMMTQ.
ASHRAE / LEED-grade documentation
Calculations, drawings, commissioning reports, and ESG-ready performance data you can hand to your tenants, lenders, and auditors.
Performance after commissioning
We monitor the systems in operation and track the first cycles to validate real-world performance and confirm the project's targets are met.
Flagship project
Altoria / Aimia Tower — LEED-certified Montréal office tower
A new-construction Montréal office tower for which Kolostat designed and built the full mechanical scope. LEED-certified and part of the portfolio that has earned Kolostat multiple ASHRAE awards for innovative energy and sustainable-design projects.
- LEED
- Certified office tower
- ASHRAE
- Award-recognized portfolio
- Design-build
- Full mechanical scope
How we work
From first conversation to commissioning
Meet
Data capture and analysis to determine the optimization potential of your facilities. Free.
Visit
Site visit and analysis of your facilities by a certified engineer.
Diagnose
Engineering proposal with cost, schedule, and grant eligibility.
Build
Execution, commissioning, and performance monitoring.
Where this leads
Design-build by building type
The same in-house team, sector-specific engineering — sized for the codes, uptime constraints, and procurement model that apply to you.
Commercial
Office towers, multi-residential, and mixed-use — built around rentability, ESG, and operating cost per square foot. Bell, TELUS, MACH, BentallGreenOak, CAPREIT.
Industrial
Plants, processing, agri-food, indoor agriculture — engineered around uptime constraints and code compliance. Husky, thyssenkrupp, Bristol-Myers Squibb, Zodiac Aerospace.
Institutional
Hospitals, universities, school boards, archives, and government facilities — built to a 30-year asset life. Library and Archives Canada, CHU Sainte-Justine, Jewish General Hospital.
New construction
Full-scope mechanical installation for commercial and institutional new construction — HVAC, plumbing, gas, sheet metal, controls. Across Quebec and Ontario.
HVAC capabilities
The full mechanical stack, in-house
Heating, ventilation, AC, piping, sheet metal, and controls — engineered, fabricated, installed, and commissioned by the same team.
Procurement FAQ
What our clients ask before signing on
Can Kolostat act as the prime mechanical contractor on a design-build or stipulated-price project?
Yes. We carry RBQ licensing (1269-6704-94) and CMMTQ membership, and we routinely act as prime mechanical on design-build and stipulated-price delivery models for commercial, industrial, and public-sector clients — including new-construction mandates such as Library and Archives Canada.
Can you take a project from schematic design through to commissioning?
That is the core of our design-build offering. A single in-house team owns engineering, equipment selection, fabrication, installation, controls integration, and commissioning — with performance monitoring after handover so the numbers in service match the design intent.
Do you self-perform mechanical and controls work in-house?
Yes. Our multidisciplinary team — engineers, designers, draftsmen, control technicians, project managers, millwrights, and service professionals — brings the bulk of mechanical, piping, and controls work in-house. The integrated team is the reason design-build is our core delivery model.
How do you manage work in occupied buildings without disrupting tenants?
We routinely execute projects in occupied buildings without disrupting tenants — sequencing shutdowns, running temporary services, and scheduling invasive work outside tenant hours. Our service division (25+ trucks, 24/7 dispatch) backs the construction team when off-hours coverage is required.
Can grant funding be folded into a design-build project?
Yes — and the project is designed around it. Through our Energy division, we identify eligible measures (ÉcoPerformance, Énergir, Hydro-Québec, NRCan), file analysis and implementation applications, and report post-installation. Up to 75% of project cost has been grant-financed on past projects.
Do you deliver ASHRAE / LEED-grade documentation?
Yes. Our project history includes multiple ASHRAE awards for innovative energy and sustainable-design work, and LEED-certified deliveries including Bell Canada HQ (Nun's Island) and the Altoria / Aimia Tower in Montréal. Calculations, drawings, and commissioning reports are produced to the documentation standards those certifications require.
Request a quote
Tell us about your project
Submit right here — a Kolostat engineer will follow up to scope the work. Email or phone is required.
Get started
Have a design-build mechanical scope?
One contract from engineering to commissioning. RBQ-licensed (1269-6704-94), CMMTQ-certified.