Key Takeaways:
- Every raised deck needs stairs — required by building code for decks with a single exit point
- Ontario Building Code: maximum rise 7.75" (200mm), minimum run 10" (250mm)
- Pre-cut stringers available at lumber yards — $15–$40 each for 3 to 8 steps
- Steel stringer brackets: $25–$60 per bracket — stronger and required for composite treads
- Budget $500–$3,000 for deck stairs depending on material and height
Building Code Requirements
Canadian building codes are specific about deck stairs. The National Building Code of Canada and provincial codes (OBC, BCBC, CCQ) all regulate:
| Requirement | Standard | Notes |
|---|---|---|
| Maximum riser height | 200mm (7.75") | Consistent rise — max 6mm variation between steps |
| Minimum tread depth | 250mm (10") | Measured from nosing to nosing |
| Minimum width | 900mm (36") | Clear width between railings |
| Handrail required | When 3+ risers | On at least one side |
| Guard required | When >600mm drop | Full railing height (42") on open side |
| Landing | Every 12 ft of vertical rise | Level platform min 900mm deep |
| Nosing overhang | 25mm (1") max | Prevents tripping |
Number of Steps Calculator
| Deck Height | Number of Risers | Stringer Length |
|---|---|---|
| 24" (2 ft) | 3–4 | 4–5 ft |
| 36" (3 ft) | 5 | 6–7 ft |
| 48" (4 ft) | 6–7 | 8–10 ft |
| 60" (5 ft) | 8–9 | 11–13 ft |
| 72" (6 ft) | 10–11 | 14–16 ft |
Stringer Options
Wood Stringers (Pre-Cut) — $15–$40 each
Available at Home Depot, Lowe's, and lumber yards across Canada. Pre-cut for standard 7.5" rise and 10" run. Made from pressure-treated lumber (2×12).
- 3-step: $15–$20
- 5-step: $25–$30
- 7-step: $30–$40
- Need 3 stringers for stairs up to 36" wide, 4 stringers for 36–48" wide
Steel Stringer Brackets — $25–$60 per bracket
Metal brackets that attach to a 2×12 board, creating precision-cut stair profiles. Required for composite stair treads — the wider bearing surface prevents composite board deflection.
- Peak Products and Pylex are the most common Canadian brands
- Adjustable models accommodate different rise/run combinations
- Galvanized or powder-coated for outdoor durability
Tread Materials
| Material | Cost/Tread | Maintenance | Slip Resistance |
|---|---|---|---|
| Pressure-treated | $5–$12 | Annual staining | Moderate (add grip strips) |
| Cedar | $10–$20 | Annual oiling | Moderate |
| Composite | $15–$30 | None | Good (textured surface) |
| PVC | $20–$35 | None | Good |
| Aluminum | $25–$40 | None | Excellent (non-slip surface) |
Non-Slip Safety
Deck stairs are the highest-risk area for slipping, especially in winter. Canadian solutions:
- Anti-slip stair treads: adhesive grip strips — $5–$15 per step
- Textured composite treads: built-in non-slip surface
- Stair lighting: LED strip lights or riser lights improve visibility at night
- Heated stair treads: electric heating cables prevent ice — $100–$200 per step
Cost Summary
For a standard 5-step staircase (36" wide, matching deck material):
| Component | PT Wood | Composite |
|---|---|---|
| 3 stringers | $75 | $75 (PT base) |
| Steel brackets | — | $150 |
| 5 treads | $40 | $100 |
| Railing (one side) | $150 | $250 |
| Fasteners | $25 | $40 |
| Total (materials) | $290 | $615 |
| Installed | $500–$800 | $900–$1,500 |
