Multi-Family and Mixed-Use Construction in Calgary

Multi-family and mixed-use construction in Calgary turns on one early question: is the building Part 9 or Part 3 under the National Building Code – 2023 Alberta Edition? The answer decides the structure, the fire protection, the engineering and much of the cost. A three-storey rowhouse project and a six-storey apartment with shops at grade can have similar unit counts and very different budgets, and that difference is set before anyone draws a floor plan.

Part 9 or Part 3?

Part 9 covers smaller buildings: generally three storeys or less and a limited footprint, such as rowhouses, stacked townhouses and small walk-up apartments. They can be designed more prescriptively and are often wood-framed.

Part 3 covers larger and more complex buildings, including most mid-rise apartments and almost every mixed-use building with commercial space at grade. Part 3 buildings need full engineering, sprinklers, more demanding fire separations and exits, and usually more complex mechanical systems. Commercial space on the ground floor generally pushes a building into Part 3 even when the residential part alone would not be.

Separating homes from shops

In a mixed-use building, the residential floors are separated from the commercial floor by rated fire separations, and each commercial unit is separated from its neighbours. That separation has to account for every duct, pipe and cable that passes through it, and each one needs a tested firestop.

Sound and smell matter just as much. A restaurant below apartments needs its kitchen exhaust taken up through the building to the roof, with a rated shaft, and its make-up air and equipment chosen with the neighbours in mind. A gym needs floor isolation so weights dropped at 6 a.m. do not wake the apartment above. If you know what kind of tenants you want at grade, plan the base building for them, as we describe on our strip mall and retail plaza page.

Sound between units

Buyers and renters notice noise between units more than anything else. The building code sets minimum sound ratings for walls and floors between dwellings, and good builders aim above them. Wood-frame floors need careful assemblies, with resilient channels, insulation, a topping or underlay, and attention to plumbing penetrations and outlet boxes, to keep footsteps and voices from carrying.

Podiums and wood frame

A common mid-rise form in Calgary is a concrete podium, holding the parkade and the ground-floor commercial units, with several storeys of wood-frame residential above. The concrete podium handles the commercial uses, the parking and the fire separation at the bottom. The wood frame keeps the residential floors cost-effective.

Wood frame shrinks as it dries, more over several storeys than people expect. Plumbing stacks, elevator shafts, exterior cladding and anything tied to the concrete core need details that allow for that movement.

Underground parking

Underground parking is usually the most expensive part of a multi-family building per stall. Excavation, shoring when the site is tight against neighbours or the street, waterproofing, ventilation, sprinklers and the ramp all add up. The development permit sets the parking requirement, and the number of stalls below grade often decides whether a project works financially.

Office-to-residential conversions

Calgary's downtown has been converting vacant office towers to homes through the Downtown Development Incentive Program, which pays $75 per square foot. The City's goal is to remove 6 million square feet of vacant downtown office space by 2031, and by October 2025 about 21 buildings, roughly 2.7 million square feet, had been approved, adding more than 2,600 rental homes. Conversions are their own kind of project, as our office fit-out page explains.

What multi-family construction costs

The range moves with the building height and type, the amount of underground parking, the commercial area at grade and its services, the finish level of the suites and the site conditions. Parking and the podium are the costs that surprise developers most.

Calgary approvals for multi-family projects

Most multi-family and mixed-use projects in Calgary need a development permit, and many need a land use redesignation first if the site is not already zoned for the density proposed. Redesignation goes through City Council and takes time. The development permit reviews the building's design, height, parking, landscaping and how it fits the street.

Once the development permit is issued, the building permit follows, along with trade permits for plumbing, gas, electrical and mechanical work. For larger projects, the City may also require off-site improvements such as sidewalks, utility upgrades or contributions to infrastructure. Those costs belong in the pro forma from the start.

Utilities and site servicing

A new multi-family building often needs larger water, sanitary and storm connections than the lot had before, and often a new transformer for the electrical service. Inner-city sites in older neighbourhoods sometimes face undersized mains in the street, which the developer may have to upgrade. These are among the costs that change a project's numbers most, and they are worth checking before buying the site.

Commercial units at grade

The commercial units in a mixed-use building are leased like any other retail space, so the shell should be ready for the tenants you hope to attract. Put sanitary stubs, separate meters, a rated exhaust shaft for at least one restaurant-ready unit, and enough electrical capacity in the base building. Tall ceilings and good storefront glazing make the units easier to lease.

Schedule

Mid-rise buildings take well over a year to build once the permits are in place. The parkade excavation and podium come first, then the residential floors, the building envelope and finally the interiors floor by floor. Calgary winters slow concrete work and exterior trades, so the schedule should place the excavation and podium in the warmer months where possible.