Quick Comparison: Cost per Square Foot by Roof Type (Ontario 2026)
| Roof type | Cost / sq ft installed | Lifespan | Total cost over 50 years |
|---|---|---|---|
| 3-tab asphalt shingles | $4 – $7 | 15–20 years | $12 – $21 / sq ft (3 replacements) |
| Architectural asphalt shingles | $6 – $10 | 20–25 years | $12 – $20 / sq ft (2 replacements) |
| Designer / luxury asphalt | $8 – $13 | 25–30 years | $16 – $26 / sq ft (2 replacements) |
| Metal shingles | $8 – $14 | 40–50 years | $8 – $14 / sq ft (1 install) |
| Standing seam metal | $12 – $18 | 50+ years | $12 – $18 / sq ft (1 install) |
| Corrugated metal | $6 – $10 | 30–40 years | $12 – $20 / sq ft (1–2 installs) |
| Flat roofing (TPO) | $8 – $13 | 20–25 years | $16 – $26 / sq ft (2 installs) |
| Flat roofing (EPDM) | $7 – $12 | 25–30 years | $14 – $24 / sq ft (2 installs) |
| Modified bitumen | $6 – $11 | 15–25 years | $12 – $33 / sq ft (2–3 installs) |
| Cedar shingles | $14 – $22 | 20–30 years | $28 – $44 / sq ft (2 installs) |
| Natural slate | $25 – $50 | 75–100+ years | $25 – $50 / sq ft (1 install) |
| Clay tile | $20 – $40 | 50+ years | $20 – $40 / sq ft (1 install) |
| Synthetic slate / shake | $15 – $25 | 30–50 years | $15 – $25 / sq ft (1 install) |
Total Project Cost by Home Size (Typical Ontario Detached)
| Roof size | Asphalt arch. | Standing seam metal | Flat TPO | Cedar |
|---|---|---|---|---|
| Small (1,200 sq ft roof) | $7,200 – $12,000 | $14,400 – $21,600 | $9,600 – $15,600 | $16,800 – $26,400 |
| Mid (1,800 sq ft roof) | $10,800 – $18,000 | $21,600 – $32,400 | $14,400 – $23,400 | $25,200 – $39,600 |
| Large (2,500 sq ft roof) | $15,000 – $25,000 | $30,000 – $45,000 | $20,000 – $32,500 | $35,000 – $55,000 |
| Estate (3,500 sq ft roof) | $21,000 – $35,000 | $42,000 – $63,000 | $28,000 – $45,500 | $49,000 – $77,000 |
What Drives Cost Within Each Roof Type?
Tear-off vs. over-existing
Full tear-off of existing shingles + disposal: adds $1.50–$3.00 per square foot. Most metal and premium roofing requires tear-off; basic asphalt can sometimes be installed over a single existing layer (Ontario Building Code allows max 2 layers total). Tear-off is the right answer for any 40+ year roof system because it lets us inspect and repair the deck.
Roof complexity (pitch, dormers, valleys, skylights)
A simple gable roof installs faster than a complex roof with multiple slopes, dormers, valleys, chimneys, and skylights. Each dormer or valley adds flashing work. Each skylight adds penetration sealing. Complexity can shift total cost 15–30% above the per-square-foot baseline.
Deck condition
If the existing roof deck is rotted, soft, or damaged from prior leaks, sections need to be replaced before new roofing goes on. Typical deck repair: $4–$10 per square foot of replaced area. Most projects have minor deck repair; some older homes need significant replacement.
City and permit fees
Toronto, Mississauga, Brampton, Vaughan, Markham, Oakville, Burlington, and most GTA municipalities require permits for roof replacement. Permit fees: $200–$800 depending on the city and roof size. Smaller cities may not require permits for like-for-like replacements. Heritage districts add review time and approval requirements.
Underlayment and ice/water shield
Ontario Building Code requires ice-and-water shield at eaves, valleys, and around penetrations. Quality installations use synthetic underlayment over the rest of the deck (vs. felt). These materials are typically $1–$3 per square foot added cost and are non-negotiable for a properly built roof.
Lifecycle Cost: Why Cheap Roofs Aren't Cheap
Looking only at upfront cost is the most expensive mistake in roof selection. Consider a 1,800 sq ft roof over 50 years:
- **3-tab asphalt at $5.50/sq ft** — replaces every 17 years. 50-year cost: $5.50 × 3 = **$16.50/sq ft** plus tear-off labour each cycle (~$2/sq ft × 2 = $4). **Total: ~$20.50/sq ft = $36,900**
- **Architectural asphalt at $8/sq ft** — replaces every 22 years. 50-year cost: $8 × 2 = $16/sq ft plus one tear-off ($2/sq ft). **Total: ~$18/sq ft = $32,400**
- **Standing seam metal at $15/sq ft** — single installation lasts 50+ years. **Total: $15/sq ft = $27,000**
- **Slate at $35/sq ft** — single installation lasts 75–100+ years. **Total: $35/sq ft = $63,000** but lasts well beyond 50 years
Standing seam metal is often the lowest 50-year total cost for a permanent home. The premium asphalt option costs more long-term than metal once replacement labour is included. The choice depends on how long you intend to own the property.
Material-by-Material Buying Guide
3-tab asphalt shingles — when to choose
Lowest upfront cost. Good if you're selling within 5–7 years and the new owner can replace later. Otherwise, 3-tab is rarely the best lifecycle choice anymore — architectural shingles cost only $1.50 more per square foot and last 5+ years longer.
Architectural asphalt — the GTA default
Best value for most Ontario homeowners staying 10–20 years. Good colour selection, decent lifespan, predictable cost. Available with 25–30 year manufacturer warranties from major brands (IKO, Owens Corning, GAF, BP). The most common new-roof choice in the GTA.
Metal roofing — the long-term winner
Best for homeowners planning to stay 15+ years. Highest upfront cost in the 'mainstream' category but lowest 50-year cost. Standing seam looks contemporary; metal shingles look traditional. Survives Ontario winters dramatically better than asphalt. See our metal roof cost guide and metal vs shingles comparison.
Flat roofing (TPO/EPDM/modified bitumen) — for additions and modern homes
Required on rear additions, garages, modern infill homes with flat designs, and any low-slope section. TPO is the most common new install — white reflective surface, heat-welded seams, 20–25 year warranty. EPDM is the value choice. Modified bitumen for foot-traffic / terrace applications. See our flat roof cost guide.
Cedar shingles — heritage and traditional architecture
Beautiful but requires maintenance and shorter lifespan than metal. Best on heritage properties, post-and-beam designs, and homes where the look matters more than the longevity. Fire treatment is recommended in many Ontario municipalities.
Slate / clay tile — heritage estates and forever homes
Highest cost, longest lifespan. Only consider for: heritage homes where the original was slate or tile, premium custom builds, or homes you genuinely plan to own for generations. Structural assessment required — slate weighs significantly more than asphalt and many older roof structures need reinforcement.
Frequently Asked Questions
Get a Real Quote for Your Actual Roof
These ranges are guides. Your actual cost depends on roof size, complexity, deck condition, and the materials you choose. Buildoreno provides free in-home estimates across Toronto and the GTA — metal roofing, flat roofing, and complete tear-offs. 25+ years of GTA roofing experience, 4.9★ Google reviews, manufacturer-backed warranties up to 50 years. Call (647) 254-0877.
Owner-Operator at Buildoreno with 25+ years of hands-on GTA construction experience. Last reviewed June 2026.