A custom staircase project in Ontario has four distinct design decisions that determine your total cost, timeline, permit requirements, and final visual outcome. Getting clear on each decision before your first contractor conversation means a faster, more accurate quote and no surprises at project close. This guide walks you through the four decisions, explains the tradeoffs, and gives you the reference specs you need.
Decision 1: Configuration — What Shape Is Your Staircase?
The staircase configuration is the floor plan shape — how the staircase turns (or doesn’t) between the lower and upper floor. This determines the overall footprint required, the number of treads, and the landing requirements.
- Straight: Single flight, no turns. Most common in open-plan Ontario homes. Smallest footprint along the length of the run.
- L-shaped (quarter-turn): One 90° turn at a landing mid-flight. Common where the staircase must turn to fit the floor plan. Requires a landing platform — adds to overall footprint.
- U-shaped (half-turn): Two 90° turns, full 180° change in direction. Used where the staircase must stay in a compact vertical stack. Common in townhomes and traditional two-storey homes.
- Curved or spiral: Custom arc or helical geometry. Highest fabrication complexity and cost. Spiral is a separate structural design from mono-stringer — not addressed in this guide.
Decision 2: Structural System — What Holds Up the Treads?
- Mono-stringer (floating): Single central steel beam. Engineering required. True floating visual. 15–25% cost premium over double-stringer.
- Double-stringer (open riser): Two side beams. Open riser visual. No engineering required.
- Wood box stringer (traditional): Enclosed timber stringer. Closed riser. Most cost-effective.
→ Mono-stringer staircase guide | Floating vs. traditional comparison
Decision 3: Tread Material — What Are the Steps Made Of?
- White oak (standard): Janka 1,290 lbf. Stains evenly. Ray fleck grain. Baseline pricing.
- Black walnut (premium): Janka 1,010 lbf. Rich natural dark colour. +$3,000–$5,000 per 13-tread flight vs. white oak.
- Hard maple: Janka 1,450 lbf. Near-white natural colour. Best specified natural/clear-coated.
→ Full staircase materials guide — treads, stringers, and railings
Decision 4: Railing — What Borders the Staircase?
- Glass panel (post-and-channel): $120–$160/lf. Maximum contemporary visual. Most specified with floating staircases.
- Steel baluster: $65–$90/lf. Most cost-effective. Clean contemporary look.
- Cable railing: $90–$130/lf. Industrial/coastal aesthetic. Horizontal stainless cable.
→ Glass railing cost Ontario | Cable railing Ontario guide
OBC Specs That Define Your Design Envelope
Every custom staircase in Ontario must satisfy OBC Part 9. These specs are non-negotiable — they define the minimum and maximum dimensions your design must work within:
| Parameter | Closed Riser | Open Riser |
|---|---|---|
| Rise (riser height) | 125–200mm | 125–200mm |
| Run (tread depth) | 210mm min | 250mm min |
| Clear width | 860mm min | 860mm min |
| Headroom | 1,950mm min | 1,950mm min |
| Handrail height | 865–965mm | 865–965mm |
| Guardrail height | 920–1,070mm | 920–1,070mm |
| Infill gap (100mm rule) | N/A (closed) | Max 100mm sphere |
→ Full OBC Part 9 staircase requirements
The C.O.R.S Design Process
- Consultation: Free on-site visit in Barrie/Simcoe County. We measure the opening, assess the existing structure, and confirm what configurations are feasible in your specific space.
- Design drawings: We produce shop drawings showing your staircase in your space, with all OBC dimensions confirmed. Not a generic rendering — actual fabrication-ready drawings.
- Material review: Tread samples and stain options reviewed at the consultation visit.
- Quote: Written all-in quote within 5 business days of measurement. Permit application, engineering (if mono-stringer), fabrication, delivery, and installation — all one price.
→ C.O.R.S staircase services in Barrie and Simcoe County
→ Full Ontario staircase cost guide — all configurations and materials
→ Book your free consultation