What It Costs to Build a Self Storage Facility in Ontario

The first number most self storage investors see is a steel building quote. It is the least useful number in the project. A storage facility is budgeted per gross square foot of building, financed against the whole development cost, and repaid per net rentable square foot at the rent the local market will bear. A budget that does not connect those three is not a budget.

Indicative construction cost ranges

These are indicative 2026 Ontario ranges for hard construction cost per gross square foot. They are a starting point for a feasibility conversation, not a price.

• Single-storey drive-up buildings: roughly $70 to $120 per sq ft
• Multi-storey climate-controlled facilities: roughly $160 to $260 per sq ft
• Conversion of an existing retail or industrial building: roughly $50 to $120 per sq ft, before the cost of buying the building

The ranges are wide because the product is. A drive-up site of plain unheated buildings on good soil sits at the bottom of its band. A four-storey climate-controlled facility with two freight elevators, a heated loading bay, full sprinklers and a retail office sits at the top of its band or above it.

What moves the number

Drive-up buildings

• Building count and spacing: many short buildings cost more per square foot than fewer long ones, because every end wall, corner and gable is extra envelope
• Door count: roll-up doors are a large share of a drive-up building, and a unit mix weighted to small units carries many more doors per square foot
• Paving: drive aisles wide enough to reach doors and plough snow are a large paved area, and asphalt is priced by the site, not the building
• Snow and drift loads: closely spaced buildings drift snow onto each other, which increases frame and purlin sizes
• Frost protection: unheated buildings still need foundations and slab edges protected against frost heave

Multi-storey climate-controlled facilities

• Storeys: each floor above grade adds a structural floor, stairs, and fire separation requirements
• Freight elevators: usually one of the largest single items, and the number of elevators sets how well the facility performs on a busy Saturday
• Sprinklers: common in multi-storey storage, and sized to the classification of the building
• Heating, ventilation and dehumidification: sized for the envelope and the climate, and the reason climate-controlled space commands its rent
• Partitions and corridors: the interior steel partition and door system is a substantial package on its own

Conversions

• The existing slab and structure, and whether they can carry a mezzanine floor
• The sprinkler system, which was designed for the previous use and usually needs upgrading
• New openings, loading bays and an elevator where the building has none
• What the building survey finds, which is why conversions carry a larger contingency than new builds

What sits outside the construction cost

The ranges above are hard costs. A development budget also carries items that a building quote never includes:

• Land, or the purchase price of the building to be converted
• Site servicing, stormwater management and road or entrance works
• Development charges, which vary widely by municipality and by how the municipality classifies storage
• Planning and permit fees, and the consultants who prepare the applications
• Design, engineering and geotechnical fees
• Security, access control, cameras and management software, if not carried in the construction contract
• Financing costs through construction and lease-up
• Contingency

Gross area, rentable area and the real cost

Construction is priced on gross building area. Revenue is earned on net rentable area: the floor area inside the units. The difference is corridors, stairs, elevator lobbies, walls, the office and the loading area.

A single-storey drive-up building rents almost all of its floor area, because each unit opens directly to the outside. A multi-storey facility loses a larger share to corridors, stairs and elevators. So a multi-storey facility costs more per gross square foot and also delivers fewer rentable square feet per gross square foot. Divide the construction cost by the rentable area, not the gross area, before comparing two designs. Efficient corridor layouts and a unit mix matched to the market are where design pays for itself.

From an indicative range to a number you can finance

An indicative range tells you whether a site is worth pursuing. It is not what a lender will underwrite. The sequence we run is the same as on any development:

• Class C estimate: from a concept site plan, the unit mix and a building type, against the whole scope including site work and servicing
• Class B estimate: at developed design, once the structure, elevators, sprinklers and mechanical systems are defined
• Class A estimate: from complete documents, forming the basis of a fixed price

Each estimate narrows the range as the design narrows the decisions. The expensive mistakes on storage projects are made before the first estimate, when the land is bought without testing the zoning, the development charges and the rentable area the site can actually deliver.