DESIGN-BUILD

Turnkey 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 across Canada, delivered with a controlled schedule, an optimized budget, and a single point of contact.

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Trusted by

2,000+
Projects deliveredAcross Canada since 1927
300+
Certified specialistsLEED, CEM, CMVP, RCx, RBQ, CMMTQ
25+
Certified engineersIn-house engineering for projects 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 — integrated

    300+ specialists, including engineers and technologists credentialed in LEED, CEM, CMVP and RCx. Kolostat is a CMMTQ member and holds RBQ licence 1269-6704-94 (Quebec).

  • 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
See more projects in the commercial sector

How we work

From first conversation to commissioning

  1. Meet

    Data capture and analysis to determine the optimization potential of your facilities. Free.

  2. Visit

    Site visit and analysis of your facilities by a certified engineer.

  3. Diagnose

    Engineering proposal with cost, schedule, and grant eligibility.

  4. Build

    Execution, commissioning, and performance monitoring.

Where this leads

Design-build by building type

One Kolostat team, sector-specific engineering — sized for the codes, uptime constraints, and procurement model that apply to you.

  1. Commercial

    Office towers, multi-residential, and mixed-use — built around rentability, ESG, and operating cost per square foot. Bell, TELUS, MACH, BentallGreenOak, CAPREIT.

  2. Mission-critical

    Data centers, laboratories, and cleanrooms — redundant mechanical systems engineered around uptime, controlled environments, and validated commissioning.

  3. Industrial

    Plants, processing, agri-food, indoor agriculture — engineered around uptime constraints and code compliance. Husky, thyssenkrupp, Bristol-Myers Squibb, Zodiac Aerospace.

  4. 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.

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.

Boilers, heat pumps, and hydronic distribution sized for the building’s actual load profile — not the code minimum.

Commercial heating

Custom ductwork and air-handling units engineered around code, IAQ, and acoustic constraints. Fabricated in our own shop.

Commercial ventilation

Chillers, rooftop units, and DX systems specified for peak day and the shoulder seasons your operations team actually lives in.

Commercial AC

Process, glycol, steam, condenser, and domestic-water piping fabricated and welded by CMMTQ-certified pipefitters.

Commercial piping

Custom ductwork, fittings, specialty assemblies, and certified welding — fabricated in-house and installed by the same delivery team.

Sheet metal fabrication

Sequences and BAS programming written by the team that installed the mechanicals — no integration handoff to debug.

HVAC controls

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. In Quebec, 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. One Kolostat team leads 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 deliver turnkey HVAC projects?

    Yes — turnkey delivery is what our design-build model is built for. One Kolostat team leads engineering, fabrication, installation, controls, and commissioning of heating, ventilation, and air-conditioning systems under a single contract, with a controlled schedule, an optimized budget, and a single point of contact.

  • Where does Kolostat deliver design-build projects?

    Across Canada. Founded in 1927, Kolostat delivers projects across Canada from its Laval head office and its offices in Montréal, Toronto, Newmarket and Calgary. Maintenance, repair and 24/7 service are offered in Quebec and Ontario.

  • 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. In Greater Montréal and the GTA, 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. For Quebec projects, our Energy division identifies eligible measures (ÉcoPerformance, Énergir, Hydro-Québec, NRCan), files analysis and implementation applications, and reports post-installation. On past Quebec projects, up to 75% of project cost has been grant-financed.

  • 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.

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