Buying Process

TL;DR

① Open balconies and terraces never count as liveable square footage under Ontario’s HCRA rules — developers list them separately.
② Builder’s quoted square footage is measured from exterior walls, making it 5–10% larger than your actual usable interior space.
③ Verify the real number using the registered plan, Status Certificate, or MPAC’s AboutMyProperty tool.

You walk into a condo advertised at 550 square feet and feel like something is off — the kitchen seems tighter than you imagined, the bedroom barely fits a queen. You’re not wrong. The number on the brochure and the space you actually inhabit are two different things.

Builder’s square footage is measured from the exterior face of the outer walls — meaning the thickness of every wall, column, and mechanical chase is included in the total. That’s how developers calculate and advertise unit sizes, and it’s the number that ends up on MLS listings derived from developer floor plans.

Usable interior square footage is measured from the inside face of the walls — the space you can actually walk around in. This number is typically 5% to 10% smaller than the builder’s figure. A unit advertised at 550 sq ft might deliver only 500 to 520 sq ft of true interior space.

Neither measurement is dishonest on its own — the problem is when buyers assume the advertised number is the interior number, or when they compare two properties that used different methods. In 2026’s GTA condo market, where the average unit is around 627 sq ft at an average price of $626,650, that discrepancy translates directly into how you should evaluate price per square foot.

This is one of the most common points of confusion I see with condo buyers, especially those comparing pre-construction floor plans. The answer from Ontario’s Home Construction Regulatory Authority (HCRA) is unambiguous: open balconies and terraces do not count as liveable space and cannot be included in a condo’s advertised square footage.

The correct way for a developer to present this is to list the two numbers separately:

“Suite: 500 sq ft | Balcony: 60 sq ft”

You’re buying a 500 sq ft unit that happens to come with a 60 sq ft outdoor space. When lenders appraise the property, when you calculate maintenance fees per square foot, when future buyers compare your unit to others — only the 500 sq ft figures into the equation.

There are edge cases. Enclosed balconies (glass-enclosed year-round spaces) may qualify as interior area depending on construction specifics. Juliet balconies — decorative rail openings with no usable outdoor platform — are generally not counted. If you’re looking at a unit with any unconventional outdoor feature, ask your agent to pull the registered plan and confirm exactly what’s attributed as suite area before you make assumptions.

Trusting the listing alone is not due diligence. Here are the three sources that give you the most accurate picture:

① The Registered Condominium Plan
When a condo corporation is registered with the province, every unit receives an official legal description that includes its measured area. This is the most authoritative number — it’s the figure your lawyer relies on. Your lawyer can pull this from the Land Registry Office as part of the title search. If you’re buying pre-construction, the developer must provide this before closing under Ontario’s Condominium Act.

② The Status Certificate
For resale condos, the seller is required to provide a Status Certificate — a package of documents covering the condo corporation’s financials, reserve fund, legal matters, and unit details. Your lawyer should review this during your condition period. It will typically reference the registered plan and confirm the official unit area.

③ MPAC’s AboutMyProperty Tool
The Municipal Property Assessment Corporation (MPAC) maintains assessed values for every property in Ontario. Their free AboutMyProperty portal lets you look up a property by address and see the assessed area on record. This number may differ slightly from the developer’s figure — MPAC uses its own methodology — but it serves as a useful cross-reference, especially if the MLS listing area seems inflated.

Using all three sources together gives you the most complete picture. Discrepancies between them are worth investigating before you commit.

Price per square foot is one of the most cited metrics in condo real estate — and one of the most easily distorted. If two units use different measurement bases, the comparison is meaningless. Here’s how I help clients approach it properly.

Always use interior area as the denominator. Before calculating price per square foot on any unit, confirm whether the listed size includes or excludes the balcony, and whether it’s measured from exterior or interior walls. Normalize to interior square footage before you compare two different listings.

Keep pre-construction and resale separate. Pre-construction floor plans are almost always builder’s square footage from exterior walls. Resale listings on MLS often carry the same developer-originated number, but you can’t always assume consistency. Always ask where the number came from.

Value the balcony separately. A well-oriented, usable balcony has genuine lifestyle value — especially for a condo buyer who wants outdoor space without a backyard. Don’t fold it into the price-per-square-foot calculation, but do factor it into your overall offer assessment. A south-facing 80 sq ft terrace is worth something real — just price it as an amenity, not as living space.

Be especially careful with “junior” units. Studios and junior one-bedrooms under 450 sq ft tend to have proportionally thicker walls relative to total floor area, which makes the gap between builder’s area and interior area even more pronounced. A 420 sq ft junior 1-bed may live significantly smaller than the number suggests.

How to Verify Condo Square Footage

Arthur’s Note

AZ