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Price Per Square Foot for a New Home: Why Two Quotes on the Same Plan Can Both Be Honest and $100 Apart
Costs and financing Pricing From a builder
Price Per Square Foot for a New Home: Why Two Quotes on the Same Plan Can Both Be Honest and $100 Apart
“What do you charge per square foot?” is the question we get most and answer worst, because the honest answer is a range as wide as a driveway. Here is why, what the number is good for, and what to ask instead.
Short version: Price per square foot is a budgeting tool, not a comparison tool. Builders measure square feet differently (outside of wall or inside, basement in or out, garage in or out, two-storey spaces once or twice), include different things in the price (site work, septic, allowances, HST), and build to different specifications. In 2026 a finished custom house in Simcoe County and most of southern Ontario runs roughly $325 to $600 per square foot of finished floor area above grade, before land, with the basement finish, site work and services on top or inside depending on who is counting. Use the number to check you are in the ballpark, then compare builders on a written specification and a line-by-line quote.
Why the number moves: the measurement
Nobody agrees what a square foot is. A plan drawn at 1,800 square feet can be measured to the outside of the exterior walls (the builder’s habit, since that is what gets built), the inside (the buyer’s habit, since that is what you walk on), with or without the garage, with or without a finished basement, with a two-storey foyer counted once or twice. The same house is 1,650 square feet to one person and 2,900 to another, and dividing the same price by each gives numbers $200 apart. Before you compare anything, ask what was measured.
Why the number moves: what is in the price
- Site work, septic, well, driveway and hydro service: in one quote, excluded from the next. On a rural lot that is $60,000 to $150,000 of difference by itself.
- Allowances: a kitchen allowance of $25,000 and one of $60,000 produce different per-foot numbers and the same cabinets will cost what they cost.
- Basement: unfinished, roughed-in or finished, and whether its area is in the denominator.
- HST and the rebate: in or out. The HST calculator shows how large that swing is.
- Contractor overhead and profit: inside a fixed price, or added as a percentage on a cost-plus job. Fixed price vs cost plus explains both.
- The specification: a 2×6 wall with batts and builder-grade vinyl windows, or an ICF wall with triple-pane fibreglass windows and radiant floors. Same square footage, different house, different bills for thirty years.
Why the number moves: the house itself
Per-foot cost falls as a house gets bigger, because the kitchen, the bathrooms, the mechanical room and the foundation are the expensive parts and they do not scale with the bedrooms. A 1,200 square foot bungalow can cost more per foot than a 3,000 square foot two-storey from the same builder. Bungalows cost more per foot than two-storeys (more roof and foundation per floor area). Walkouts, complex rooflines, big window walls, a second kitchen for a suite, a lake lot with rock: each one moves the number. How much house you really need and designing to a target budget are the levers that matter.
What a real range looks like in 2026
| Tier | Finished, above-grade floor area | What you get |
|---|---|---|
| Builder-grade production | $275 to $350 per sq ft | Code-minimum envelope, standard finishes, subdivision lot already serviced |
| Custom, good quality | $350 to $450 per sq ft | Better envelope and windows, custom plan, mid-range finishes, rural site work extra |
| Custom, high performance | $425 to $600 per sq ft | ICF or equivalent envelope, triple-pane windows, radiant or heat pump, upgraded finishes |
| Luxury | $600 and up | No ceiling; the finishes decide |
These are the ranges on cost to build a house in Ontario and cost per square foot to build in Ontario, before land and usually before site services. A quote well under the bottom of a tier is excluding something; find out what before you celebrate.
How to use the number
- Use it to check you are in the ballpark: a 2,400 square foot custom house at $400 is roughly $960,000 before land and site, and if your budget is $600,000 the plan needs to change before the quotes come in.
- Then stop using it. Get a written specification and have every builder quote the same one. A specification schedule template is the document.
- Compare line by line: foundation, framing, envelope, windows, mechanical, electrical, finishes, site work, allowances, overhead. The differences will be in three or four lines, and those are the conversation.
- Ask what is excluded, in writing. The excluded list is where per-foot quotes go to hide.
- Be suspicious of the lowest number. A builder with no margin is a builder who will not be there for the warranty, or who will find the margin in your change orders. Why construction companies charge what they charge explains the margin.
Related guides on this site
Sources and further reading
Questions people ask
What does it cost per square foot to build a house in Ontario in 2026?
Roughly $325 to $600 per square foot of finished above-grade floor area for a custom house, before land and often before site services, depending on specification and location. Production builders on serviced lots can be below that; luxury has no ceiling.
Why do builders quote such different prices per square foot?
They measure square feet differently, include different things (site work, allowances, HST, basement), and build to different specifications. The same house can honestly be quoted $100 per foot apart.
Is price per square foot a good way to compare builders?
No. It is a budgeting check. Compare builders on one written specification, quoted line by line, with exclusions listed.
Does a bigger house cost less per square foot?
Usually. The kitchen, bathrooms, mechanical and foundation are the expensive parts and they do not grow with the bedrooms, so per-foot cost falls as area rises and bungalows cost more per foot than two-storeys.
Building in Simcoe County or on Georgian Bay?
We are ICFhome.ca, a family builder in Tiny Township with 45 years of custom homes behind us. Pick the path that matches where you are.
Reviewed and updated October 2026. Costs are Ontario ranges, not quotes; code references are to the Ontario Building Code in force at that date.
