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Commercial · Tenant Fit-Outs & Leasehold ImprovementsTenant Fit-Out & Leasehold Improvement HVAC
Tenant fit-out and leasehold improvement HVAC is the work of making a base-building system suit a new floor plan: moving diffusers, returns and thermostats to match the new partitions, adding exhaust, and confirming the existing rooftop unit can carry the new use. In Ontario it passes three gates: a building permit with mechanical drawings, the landlord's written approval for anything touching the roof or the base building, and a close-out package at the end. The rule that saves the most money is to check the rooftop unit's capacity and condition before the lease is signed, not after the ceiling grid is up. ZK Mechanical does this work from Burlington across Halton, Hamilton, Peel and the west side of Toronto.
A tenant improvement that alters the heating, ventilation or air conditioning needs a building permit under the Ontario Building Code, filed with the municipality the unit sits in: the City of Burlington, Town of Oakville, Town of Milton, City of Hamilton, City of Mississauga or City of Brampton building department. The application carries mechanical drawings prepared by a designer who holds a BCIN with the building-services qualification, or by a professional engineer. Which of the two the building department accepts depends on the building's size and occupancy classification, so settle that at intake instead of after the drawings are finished. Gas piping is then installed by a TSSA-licensed gas technician, and new electrical circuits go through a licensed electrical contractor and the ESA.
The landlord's approval is a separate track from the permit, and it often takes longer. Most commercial leases require written consent before anyone cuts the roof, hangs load from the structure, ties into base-building ductwork or changes a rooftop unit, and many landlords insist that their own roofer makes and seals every penetration so the roof warranty survives. Ask for the tenant design criteria or tenant manual before design starts, because it lists approved equipment locations, after-hours rules and the documents due at the end. Who maintains the rooftop unit once you move in is a lease question, covered in who is responsible for HVAC in a commercial lease.
The typical scope is smaller than tenants fear and more fiddly than it looks on a floor plan. Every new full-height wall changes where supply air lands and how return air gets back, so diffusers move to suit the rooms, return grilles or transfer ducts are added for any room that would otherwise be cut off from the ceiling plenum, and each thermostat ends up in the zone its unit serves instead of inside a boardroom with the door closed. New washrooms need exhaust to the outside, a staff kitchenette may need its own fan, and ductwork crossing a fire-rated wall generally needs a fire damper at that wall. A cooking line with a grease hood is a different job with its own exhaust and make-up air design.
Capacity is the check that decides the budget. A change of use changes the load: an office that becomes a fitness studio, a clinic or a classroom puts more people in the same area, and the Ontario Building Code's ventilation requirements, which follow ASHRAE 62.1, call for more outdoor air than the old layout needed. We compare the rooftop unit's nameplate tonnage, heating input and measured airflow against the new occupant count and equipment heat, then tell you one of three things: it carries the load as it is, it carries it after repairs and a rebalance, or it has to be replaced or supplemented. A unit past 15 years old with a rusted heat exchanger or a failed compressor is a negotiation with the landlord, not a line in your fit-out budget.
Nobody can price a fit-out from the square footage alone, and we publish no flat figure for one. The quote moves with the number of diffusers and returns relocated, new exhaust runs and roof penetrations, engineering and permit drawings, repairs the rooftop unit needs, the air balance report and how much has to happen after hours. Bands for ordinary service work are on our pricing page. For the wider picture start at commercial HVAC; general contractors pricing a tender can go to HVAC subcontracting for general contractors, and anyone with drawings or a draft lease in hand can send them to the shop.
Equipment we install and service
The packaged unit the landlord left on the roof, often sized for a tenant two leases back. We record make, model, serial number, age, tonnage and gas input, test heating and cooling, and measure airflow so the capacity question is answered with numbers before the layout is final.
Flexible duct and diffusers are re-run to the new ceiling plan, and each enclosed room gets a way for air to leave: a return grille, a transfer duct or a door undercut that is large enough. A meeting room with supply air and no return path pressurizes, whistles at the door and never holds temperature.
One thermostat per unit, mounted in the space that unit serves and away from sun, supply air and heat-producing equipment. When one unit ends up feeding rooms with different loads, a remote sensor or a set of averaging sensors does more good than moving the thermostat a second time.
New washrooms are exhausted to the outside through the roof or a side wall, with the fan sized to the room and the discharge kept clear of the rooftop unit's fresh-air intake. Every fan added takes air out of the space, which is one reason the outdoor-air setting is rechecked at the end of the job.
What goes wrong in these buildings
- We signed the lease in the spring and found out in the summer that the rooftop unit cannot handle a full spin class.
- The city sent the permit application back because the mechanical drawings were not signed by a qualified designer.
- My contractor built the offices first and now the thermostat for the whole floor is inside the manager's office.
- The landlord will not release the tenant allowance until they get an air balance report and as-builts.
- The building only allows drilling and roof access in the evening, and nobody priced that.
- Three rooms have a supply diffuser and no return, and the doors whistle whenever the fan runs.
How it works
We walk the unit and the roof, pull the nameplate data, test the equipment, measure airflow and photograph the existing duct layout above the ceiling. You get a short written report stating what the base-building system can carry, which is the document to bring to the lease negotiation and to the designer.
The mechanical drawings go to the municipal building department with the permit application and to the landlord with the approval request, ideally in the same week. We answer the examiner's and the landlord's comments, and order long-lead equipment only once both have signed off so nothing arrives that cannot be installed.
Noisy work, roof access and any shutdown of base-building systems are booked in the windows the property manager allows, with fire-alarm and security notices given ahead of time. The job ends with the close-out package: an air balance report, the equipment start-up sheet, as-built mark-ups of the drawings and a warranty letter, plus the inspector's sign-off on the permit.
Common questions
Do I need a building permit to move a few diffusers?
The building department decides, not the contractor. New partitions, added exhaust, new duct mains or a change of use put the job under a tenant-improvement permit; a like-for-like diffuser shift under an unchanged ceiling may not need one. Call the building department with the unit address and a sketch before work starts, because guessing wrong means opening a finished ceiling for an inspector.
How do I know whether the existing rooftop unit is big enough for my business?
Compare three numbers: the unit's cooling tonnage and heating input from the nameplate, the airflow it delivers measured at the diffusers, and the load of the new use, which is driven by people, lighting, equipment and outdoor air. A use with more people per square metre than the last tenant needs more ventilation air, and that is usually what tips a marginal unit over. We put the comparison in writing before design begins.
What is in an HVAC close-out package?
Four documents satisfy most landlords and inspectors: an air balance report showing design and measured airflow at each diffuser and grille, a start-up sheet for new equipment with gas pressure, temperature rise and electrical readings, as-built mark-ups showing where ducts and devices ended up, and a warranty letter stating labour and equipment coverage with dates. Some landlords add operating manuals and a filter schedule.
Can the work be done while neighbouring tenants are open?
Mostly, with planning. Layout work above your own ceiling goes on during the day; coring, hammer-drilling, roof work over another tenant and any shutdown of shared equipment are normally restricted to evenings or weekends by the property manager. Tell us the building's rules at the quote stage, since after-hours windows change the schedule and the crew size more than any other single factor.
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