A back door does more work than it gets credit for. It is the one you use every day, coming in from the garage, carrying groceries, letting the dog out, stepping onto the deck. It is also a common entry point for break-ins, and one of the least-considered components in a renovation. This guide covers every back door choice that matters in Ontario: types, materials, glass options, security, sizes, real 2026 prices, and design ideas that work in Toronto and the GTA.
Key Takeaways
- A back or rear door is any exterior door that leads to the backyard, deck, garage, or side yard — separate from the main front entry.
- The four main back door types in Canada are single steel or fibreglass doors, French doors, sliding patio doors, and screen doors.
- Fibreglass and steel dominate the Ontario market — fibreglass for warmth and woodgrain looks, steel for security and price.
- A back door with glass adds light and curb appeal but requires the right glazing (Low-E, Argon, tempered) to remain energy-efficient.
- Installed back door prices in Ontario for 2026 typically run $1,400–$3,000 for single doors and $2,200–$6,000 for French or sliding patio doors.
- Security upgrades — multi-point locks, deadbolts, reinforced strike plates, smart locks — matter more on the back door than the front, because backyards are less visible from the street.
What Is a Back or Rear Door?
A back door is any exterior door that opens from a living area to the backyard, deck, patio, garage, or side yard. The terms back door, rear door, and side door are often used interchangeably. Side doors usually open onto a side yard or driveway, and back doors face the rear of the property.
In most Toronto homes, the back door sits off the kitchen, mudroom, or family room. It carries the daily traffic and serves as a secondary emergency exit. Upgrading it improves three things at once: security, energy efficiency, and the look of your home's back.
Types of Back Doors
There are four mainstream back door types installed in Ontario homes, each suited to a different opening and use case.
Single Back Doors
One solid panel, usually steel or fibreglass, sometimes with a glass insert. The most affordable and adaptable back door installed for kitchen exits, side entrances, and garage entries. Sizes range from 24" to 36" wide; 32" and 34" are most common in Toronto homes.
French Doors
Two hinged panels meeting in the middle, usually with full glass in each panel. They bring serious natural light into the room and suit back entrances leading to decks, gardens, or dining rooms. One panel typically serves as the daily door, while both open to move furniture.
Sliding Patio Doors
A sliding patio door has glass panels moving horizontally on a track. Standard sizes are 5, 6, and 8 feet wide; three- and four-panel versions reach up to 16 feet. They dominate kitchens and family rooms — no swing arc, full glass view, maximum daylight.
Screen Doors
A secondary door installed in front of the main back door — lets air through while keeping insects out. Retractable systems pull out only when needed, which makes them nearly mandatory for back doors that get heavy summer use.
| Type | Best Use | Typical Width | Light/View | Price Range (installed) |
|---|---|---|---|---|
| Single back door | Side entry, kitchen exit | 24"–36" | Low to medium | $1,400 – $3,000 |
| French double door | Back of house, dining area | 5'–6' | High | $3,500 – $6,000 |
| Sliding patio door | Kitchen, family room, walkout | 5'–16' | Maximum | $2,200 – $8,000 |
| Screen door | Add-on for any back door | Matches the main door | n/a | $400 – $1,200 |
Back Door Materials: Steel vs Fibreglass vs Wood vs Composite
The material determines how the door performs and how long it lasts. Four dominate the Canadian market.
| Material | Insulation (R-value) | Durability | Maintenance | Look | Typical Slab Price |
|---|---|---|---|---|---|
| Steel | R-10 | High (dents possible) | Low | Smooth, painted | $700 – $1,500 |
| Fibreglass | R-15+ | Excellent | Very low | Smooth or woodgrain | $1,500 – $3,000 |
| Wood | R-6 | Moderate | High | Authentic wood | $1,800 – $4,000+ |
| Composite | R-10–14 | High | Low | Smooth, painted | $1,200 – $2,500 |
- Steel is the best value for security and price. Insulated steel slabs resist forced entry and perform well in Ontario winters. The trade-off is that steel dents and the painted finish can scratch.
- Fibreglass is the premium choice for exposed back entrances. It mimics stained or painted wood, will not rot, dent, or rust, and has the highest insulation value of any door material. Most quality back door installations in Toronto today are fibreglass.
- Wood is the most beautiful but needs repainting or restaining every few years and reacts to humidity. Only really suitable for entrances under a covered porch.
- Composite blends steel pricing with some of fibreglass's moisture resistance — a middle option for utility entrances.
Glass Options for Back Doors
A glass back door lets light in and offers a view of the yard. The options that matter:
- Clear glass — maximum light, no privacy.
- Privacy / sandblasted glass — diffuses light, blocks the view from outside. Common for ground-floor back doors visible to neighbours.
- Decorative glass — patterned inserts that add curb appeal.
All glass on a modern back door should be double-glazed with Low-E coating and Argon fill to meet ENERGY STAR performance in Ontario.
Back Door Ideas for Canadian Homes
Design choices that work in Toronto and the GTA, configurations that hold up in Canadian weather:
- Full-glass steel or fibreglass door with privacy glass. Maximum daylight without exposing the kitchen to the neighbours.
- Black or dark grey fibreglass exterior. The most-requested back door colour across the GTA in 2026.
- French doors with internal grills. Classic look, no exterior cleaning.
- Sliding patio door with built-in miniblinds. Solves the window-covering problem for a large glass door.
- Dutch door for a kitchen back exit. The top half opens for ventilation; the bottom keeps pets and toddlers in.
- Half- or three-quarter-glass single door. The sweet spot between privacy and light for ground-floor entrances.
Back Door Security: Why It Matters More Than the Front
Back doors are the entry point Toronto burglars prefer; backyards are screened by fences; the back is less visible than the front; and homeowners typically invest in their front door while leaving older slabs and weak deadbolts on the back. The security upgrades that actually move the needle:
- Solid steel or fibreglass slab — never a hollow-core door.
- A multi-point locking system that engages the frame in 3+ points with a single handle turn.
- Grade 1 or Grade 2 deadbolt with at least a 1-inch throw.
- Reinforced strike plate with 3-inch screws into the framing studs.
- Smart lock or keypad lock — eliminates the need for hidden spare keys.
- Tempered or laminated glass on any door with a glass insert.
For back doors with high security needs, an integrated multi-point lock with reinforced framing is the closest residential equivalent to a commercial-grade door.
Back Door Cost in Ontario (2026)
Installed prices for back door projects in Toronto and the GTA in 2026, including supply, delivery, removal, and installation:
| Project | Typical Installed Price | Notes |
|---|---|---|
| Standard single steel back door | $1,400 – $2,400 | Most common kitchen/side entry |
| Single fibreglass back door | $2,000 – $3,500 | With a glass insert and a woodgrain finish |
| Single back door with sidelite | $2,500 – $4,500 | Adds light to mudrooms / dark entries |
| French back door (double) | $3,500 – $6,000 | Standard 5–6 ft, double-glazed |
| Sliding patio door (6 ft, 2-panel) | $2,000 – $3,000 | Most common backyard walkout |
| Sliding patio door (8 ft, 2-panel) | $3,000 – $4,000 | Open-concept kitchens, lakefront homes |
| Retractable screen door | $800 – $1,200 | Add-on for any back door |
Add: brick-to-brick installation (+$300–$600), upper-floor walkouts (+$200–$500), custom colour (+10–15%), and framing changes if the opening size changes.
Standard Back Door Sizes in Ontario
- Single back door: 30", 32", 34", or 36" × 80" — 32" and 34" most common.
- French double: 60" (2 × 30") or 72" (2 × 36") × 80".
- Sliding patio: 60", 72", or 96" × 80"; custom widths to 16 ft for multi-panel doors.
Custom sizes add 20–50% to cost and lead time. Replacing within the existing opening is significantly cheaper than enlarging it.
How to Choose the Right Back Door
The right back door depends on what is behind it:
| Scenario | Recommended | Why |
|---|---|---|
| Kitchen walkout to deck | Sliding patio or French door | Maximum light, easy traffic |
| Side door/driveway entry | Single steel or fibreglass | Security + price |
| Garage-to-yard utility door | Single fibreglass, no glass | Durable, secure, no privacy concerns |
| Mudroom back exit | Single fibreglass with half glass | Light + privacy + insulation |
| Open-concept family room | 8-ft sliding patio (3-panel) | View and indoor-outdoor flow |
| Heritage or character home | French doors with grills | Period-appropriate look |
| Limited interior swing space | Sliding patio door | No swing arc inside |
Professional Back Door Replacement in Toronto and the GTA
At Vinyl Light Windows & Doors, we manufacture and install back doors across Toronto and the GTA, as well as single steel and fibreglass doors, French doors, sliding patio doors, and matching screen systems. Every installation uses ENERGY STAR-rated insulated glass with Low-E coatings, multi-point locking where appropriate, and full exterior finishing.
Our standard service covers on-site measurement, door manufacturing to fit your opening, installation by in-house crews, removal of the old door, exterior finishing, and hardware setup.
Contact us for a free in-home estimate — we will assess your opening, recommend the right door, and provide a transparent, no-obligation quote.
The best back door is the one matched to how you use it. A glass sliding door makes a kitchen walkout feel twice as large. A single steel door keeps a side entry secure for under $2,000, installed. A fibreglass French set turns the back of the house into the focal point. What separates a good back door from a bad one is rarely the spec on paper; it is whether the door is the right size for the opening, properly glazed for Ontario's climate, and installed so it seals and locks as engineered.
