Why Your New Condo Is Smaller Than the Floor Plan: How Builder Square Footage Really Works
Stated area vs. usable area, why balconies don’t count, and the 2% rule that decides whether you have a case
Why is my pre-construction condo smaller than the square footage shown on the floor plan?
According to Ontario’s HCRA Directive 3 – Floor Area Calculations (effective 2021), the “stated area” a builder prints on a floor plan is measured to the exterior face of outside walls and to the centre line of the walls separating one unit from another — so it includes structural walls and mechanical shafts you can’t actually use, which is why stated area is always larger than the usable (carpet) area under your feet. The same floor plan can also measure differently by floor: the industry convention is to use a mid-building floor, so lower units can be smaller because structural members are thicker. Ontario allows a +/- 2.0% variance, and whether anything larger is fixable depends on your Agreement of Purchase and Sale (APS) — not on Tarion.
Source: Ontario Home Construction Regulatory Authority (HCRA) Directive 3 – Floor Area Calculations (2021); Condominium Act, 1998 (Ontario); Tarion.com
You finally get the keys, move the furniture in, and the unit just doesn’t feel like the 650 square feet on the brochure. In most cases the builder didn’t lie — it’s that “the number on the floor plan” and “the floor area you can actually use” are two different measurements. The real problem is that almost no buyer asks, before signing, how the builder measured that square footage. So they price the unit per square foot, compare buildings, and run their whole budget off a figure that was measured to the outside of the walls. Here’s how Ontario’s measurement rules actually work, why balconies don’t count toward interior area, the variance threshold that matters, and exactly what to read in your contract.
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The builder measures to the outside of the walls, not the floor you stand on
Stated area is not usable area — the gap is walls and shafts
1. Stated / saleable area — the number printed on the floor plan and price list, measured to the outside of the walls.
2. Usable / carpet area — what you can actually use once wall thickness and shafts are removed.
3. Balcony / terrace — usually listed separately and excluded from interior area (next section).
There’s no fixed percentage for how big the gap is; it depends on wall thickness, how irregular the layout is, and whether structural columns cut through the suite. Long, narrow units or ones loaded with bearing walls and shafts “shrink” more. When you’re shopping, don’t just stare at the stated number — have your agent estimate the usable area and compare on that basis.
Why balconies and terraces aren’t counted in interior area
ℹ️Practical tip: When you get a floor plan, subtract the balcony/terrace from the headline number first, then have your agent estimate the usable interior area — and compare buildings on that figure, not on the stated number from the price list.
The same unit type measures differently by floor
Your legal unit boundaries live in the declaration
Price per square foot can quietly mislead you
+/- 2% is the line — beyond it, your contract matters, not Tarion
⚠️Don’t count on Tarion for area: the new-home warranty doesn’t cover floor area calculations, and the marketing materials warn that area may vary. If you want a remedy for a shortfall, the time to get an area/compensation clause into the deal is before you sign — with a real estate lawyer who knows pre-construction.
💡 One line to remember: stated area is a sales measurement — taken to the outside of the walls, including structure, based on a middle floor, and excluding balconies — not the floor area you can actually use. Before you sign, ask how it was measured, compare on usable area, read the declaration, and confirm the area clause in your APS. Those four checks head off almost every “it shrank at closing” surprise.
Frequently Asked Questions
The floor plan said 700 sq ft but my unit measures 660. Can I get money back from the builder?
Two steps. First, Ontario allows a +/- 2.0% variance — 2% of 700 is about 14 sq ft, and 660 is 40 sq ft (about 5.7%) short, which exceeds the tolerance. Second, whether it’s recoverable depends on your APS, because the Tarion warranty doesn’t cover floor area. If your contract has an area or compensation clause, follow it; if not, you’re negotiating with the builder or getting a lawyer’s read — there’s no automatic refund. Keep the floor plan, price list, and any measurement records.
Why isn’t my balcony counted in my interior square footage?
Under Ontario’s HCRA floor area directive, open and enclosed balconies are excluded from a unit’s interior floor area unless they’re heated, insulated, and designed as year-round habitable space per the Building Code. That’s why listings often read “X sq ft interior + Y sq ft balcony.” When you compare price per square foot, keep the balcony separate so you don’t overstate the interior living space.
Why does the same unit type show a different square footage on different floors?
Because HCRA lets builders state area using a representative “middle floor” with a note that lower units may be smaller — structural members are thicker and mechanical rooms take space — while higher units can be slightly larger as the structure tapers. So the floor-plan number is a representative figure, not an exact measurement of your specific suite, and floor-driven deviation is often structurally expected.
How do I know which spaces actually belong to my "unit"?
Read the condominium’s declaration and description — the legal documents required by the Condominium Act, 1998 that define your unit boundaries. They set where the unit begins and ends, and whether the balcony, parking, and locker are part of the unit or exclusive-use common elements. The builder’s disclosure statement includes a draft declaration, so review it alongside the floor plan before you sign.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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