What the price covers
A legal second unit: its own kitchen and bathroom, a bedroom with an escape window, fire separation, a simple separate entrance, and the permits and inspections.
Basic, mid-range and premium
The same range split by finish level, as the basement calculator does: the lower half, the middle and the upper half of the published range.
| Project | Basic | Mid-range | Premium |
|---|---|---|---|
| Legal basement apartment median of 6 companies | $90 – $115 per sq ft | $102.50 – $127.50 per sq ft | $115 – $140 per sq ft |
At mid-range finishes, before HST, that works out to:
| Basement size | Mid-range total |
|---|---|
| 600 sq ft | $61,500 – $76,500 |
| 800 sq ft | $82,000 – $102,000 |
| 1,000 sq ft | $102,500 – $127,500 |
What each company publishes
The 6 GTA companies behind this range, cheapest first, in their own words. Our range is the middle (median) of their lows and highs.
| Company | Their price | What their page says |
|---|---|---|
| Leedway Group (Toronto) | $90 – $140 per sq ft | “a legal secondary suite runs $90–$140+ per square foot” |
| renoWOW! (Toronto) | $90 – $140 per sq ft | “Legal basement suite | $90 to $140+ | $75,000 to $115,000+ | Full kitchen, separate entrance, egress window, fire separation, permits, inspections.” |
| Dotch Construction (GTA) | $90 – $140 per sq ft | “Legal basement suite | $90–$140 | $72K–$112K” |
| ASM Construction (Scarborough / GTA) | $90 – $140 per sq ft | “Budget $90–$140 per square foot for a legal basement suite renovation in the GTA.” |
| Leo Constra (Toronto) | $90 – $150 per sq ft | “A legal secondary-suite build-out runs $90–$150 per square foot in the Toronto area as of 2026.” |
| Maserat Developments (Toronto) | $120 – $200 per sq ft | “Legal secondary suite: $120,000 – $200,000+ ($120–$200+/sqft)” |
Prices read on each company’s own page; newest read Oct 8, 2026. This is a budget range, not a written estimate or quote. Your exact price comes in a written estimate after a free in-home visit.
Our promise on every job
- Fixed price. Your written price won’t go up unless you sign a change.
- Finish date in writing. Late? We take $100 a day off your final payment.
- 10% to book. Then pay for each stage as it starts. Never more than one stage ahead.
- 5-year warranty. On our workmanship, in writing.
More basement prices
- Basement finishing$40 – $50 per sq ftMid-range
- Underpinning$45,500 – $72,000Extra, mid-range
- Separate entrance (walk-up)$21,000 – $27,000Mid-range
- Basement bathroom$17,500 – $22,500Mid-range
- Egress (escape) window$3,700 – $5,500 per windowMid-range
- Your own basementAnswer a few questions for your range. No email needed.
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