A standard two-panel vinyl sliding patio door usually costs between $2,200 and $3,500 installed in the GTA, based on rates from fall 2026. Triple-pane glass and French doors push the patio door installation cost higher. Cutting a brand new opening in the wall adds the most.
Most of the patio door jobs we do in Markham are replacements, where the old door comes out and a new one goes into the same opening. That’s the least expensive kind of patio door installation, and it’s what most homeowners are pricing when they look up patio door replacement cost.
This guide is for Markham homeowners looking to install or replace a patio door. I’ll break down the costs, where the money goes and how to read a quote along with some bonuses of what you can expect.
How Much Does Patio Door Installation Cost in Markham?
Most Markham homeowners pay about $2,200 to $3,500 for the cost to install a standard sliding patio door in an existing opening, and $3,500 to $5,000 or more for upgraded sliders or French doors. Where you land can vary depending mostly on the door type and how much repair the opening needs.
Here are typical installed price ranges for the Toronto area:
Door type | Typical installed cost (GTA) |
|---|---|
Two-panel vinyl sliding glass door | $2,200 to $3,500 |
Two-panel slider with triple-pane glass | $2,500 to $4,300 |
Premium slider (fibreglass, wood-clad, upgraded hardware) | $3,500 to $5,000 |
French doors (exterior pair) | $2,500 to $5,000+ |
Three- or four-panel sliding doors | $3,000 to $5,000+ |
Bifold doors or multi-slide systems | $5,000 to $10,000+ |
These ranges are before 13% HST. Luxury multi-panel or bifold systems can run well above standard patio door pricing. Nationally, patio door installation costs are often quoted around $600 to $6,000, while full installed projects commonly land around $1,200 to $6,000+ depending on scope. When you compare quotes, also ask whether interior trim and exterior aluminum capping are included, since some companies price those separately.
National price guides often quote lower numbers. HomeStars puts the average cost of a sliding glass door in Canada at $1,000 to $3,500 installed, and notes that GTA prices run 10 to 15 percent higher. Most homeowners nationally pay around $2,200 for a standard sliding door, and sliding glass door costs are often quoted at $1,000 to $3,500 installed. Most of that gap is labour. Door installers in York Region and Toronto cost more per hour than installers in smaller towns.
What Goes Into the Total Cost?
A patio door quote should break out the separate door cost, labour, removal of the old door, and any repairs to the opening, with the price of materials shown clearly where relevant. Labour alone often accounts for about 30% to 40% of the total budget. Seeing each piece separately makes it easier to compare two quotes side by side, especially when common extra charges include removal and disposal of the old unit and structural repairs.
The Door Itself
The door is the biggest part of the bill. A stock 5 or 6 foot vinyl slider at a Canadian big-box store lists for roughly $1,000 to $1,900 in materials before anyone installs it, with vinyl patio doors typically the cheapest option available. Contractor-grade doors with better rollers and higher-rated glass cost more, and custom sizes cost more again.
Labour
There are two ways to replace a patio door in the same opening, and replacing an existing door there usually carries lower labour costs than cutting a new opening. A panel or insert swap keeps the old frame and only changes the moving parts. A full frame replacement takes everything out down to the rough opening, which is the framed hole in the wall, and puts in a complete new door. Most patio door replacements in Markham are full frame, because sliders are sold as one assembled unit.
Most installers charge $200 to $1,000 for labor. Labour for a simple swap in a sound frame usually runs $200 to $500. A full frame replacement takes longer and needs two people, so labour can reach $800 or more.
Good labour on a sliding glass door installation covers more than lifting the new door into place. The installer should strip old caulking and insulation from the opening, check that the sill is level, shim the frame, fill the gaps with low-expansion foam, and caulk the perimeter. They should also add flashing, which is metal or membrane that steers water away from the door. Skipping any of those steps is how a new patio door ends up drafty by February.
Removal, Disposal and Surprise Repairs
Removal and disposal charges for existing doors can add $100 to $500, depending on their size and weight. The bigger unknown is what we find underneath it.
On older Markham homes, the subfloor under the sill sometimes has rot from years of water sitting against the door. This happens a lot where a deck was built level with the threshold and drains toward the house. Fixing a soft sill or subfloor can cost extra, roughly $100 to $500 before the new door goes in. The actual cost depends on what’s hiding behind the old trim, so a good quote tells you up front how that will be handled if it comes up after work begins.
What Other Factors Change the Price?
Door type and frame material move the price the most, followed by door size and glass type. Here’s how each one plays out.
Frame Material
Vinyl is the most affordable patio door frame and handles Ontario freeze-thaw cycles well. It never needs painting.
Fibreglass and other composite frames cost more but stay stable through temperature swings. They’re low maintenance and can take paint.
Aluminum frames are slim and strong, but aluminum lets heat escape quickly. If you go this route, ask for a thermally broken frame, which has an insulating strip inside that slows the heat loss.
Wood or wood-clad doors look the warmest and cost the most. The interior side needs refinishing over time.
For most homes here, vinyl gives the best value. Wood-clad makes sense if you’re matching wood windows or trim.
Door Size and Panels
Standard sliding patio doors usually come in a [two panels] configuration and are 5 or 6 feet wide and about 80 inches tall, which is the most common setup in Markham homes. Doors in those sizes are mass-produced, so they cost the least. Three- and four-panel sliders let in more natural light, but the glass is heavier and the wall needs a stronger header above the opening. A custom door size for an older opening also costs more because it requires special manufacturing.
Glass Type
Double-pane Low-E glass with argon gas between the panes is the standard choice for energy efficiency in any Ontario home; single-pane glass has poor insulating properties and is not a good choice for patio doors here. Low-E is a thin coating on the glass that reflects heat back into the room, and multiple panes help bring in natural light while improving insulation at a fair price. Triple paned glass has three panes instead of two and usually adds $300 to $800 per door. In cold climates, that upgrade improves insulation, cuts heat loss, and makes the room near the door noticeably more comfortable in January.
Building code calls for safety glass in patio doors, and that’s almost always tempered glass. It’s already built into the price.
If you’re weighing triple-pane for the whole house, our post on triple pane windows covers the same trade-off.
Can You Replace a Patio Door Without Replacing the Frame?
Sometimes you can, if the existing frame is solid and replacement parts are still available. Most sliding glass doors older than 20 years get a full frame replacement instead.
There are a few cheaper fixes to know about:
Only the glass: If one sealed glass unit has fogged up between the panes, replacing just the glass costs about $250 to $1,000 per panel.
One panel: Replacing a single sliding panel can work, but the new panel has to come from the same maker and match the frame exactly.
Rollers and track: A door that drags can often be fixed with new rollers for $110 to $300.
My rule of thumb is that repair makes sense on a door under about 15 years old where the trouble is isolated to one component. If the frame is bent and you can feel a draft along the bottom, a new door is the better use of your money.
How Much Does It Cost to Add a New Opening?
Plan on roughly $1,400 to $4,000 on top of the door itself to cut a new opening. That covers framing a new header and finishing the wall inside and out. In some cases, masonry, drywall repair, or exterior finishing is also quoted by the square foot.
A lot of homes in Markham have brick veneer on the back wall. Cutting brick and setting a steel lintel, the beam that holds up the brick above the door, takes a mason’s time. Those jobs sit at the upper end of that range and can go past it. Turning an existing window into a patio door is often cheaper than starting from a solid wall, because part of the header work is already done. It still counts as a bigger opening, though.
Permits are where people get tripped up. In Markham, replacing a door with no change to the rough opening does not need a building permit. Cutting a new opening or making an existing one wider does, because that’s structural work. [Confirm with City of Markham Building Standards before publishing] Your contractor should handle the drawings and inspections.
Are French Doors Cheaper to Install Than Sliding Doors?
No, French doors usually cost more to install than sliding patio doors of the same width, and exterior units typically run about $1,200 to $4,500 installed. They have two operating panels and a multipoint lock, which latches at the top, middle, and bottom for security. Both doors also need careful adjustment so they seal tight. Similar-style interior doors can cost less because they are not exposed exterior units, even when they use the same glass-paneled hinged design to bring in natural light.
French doors need clear space to swing. If your kitchen table sits right inside the patio door, a slider is the practical choice. The good news is that the same rough opening can usually take either style, so switching from a slider to French doors doesn’t always mean structural work.
Should You Buy a Big-Box Door or Hire a Patio Door Installer?
A big-box store can be the cheaper way to buy a standard-size door, but a local patio door installer gives you more control over the fit and the warranty. If you want fresh air, ask whether the patio door package includes a screen or retractable screen for ventilation while keeping insects out. Home Depot and similar stores offer installation through subcontracted crews, so ask who will actually do the work.
Can you install one yourself? It’s possible if you’ve installed exterior doors before. For most people I’d say professional installation is worth the money. A new sliding glass door is heavy enough to need two people, and it has to be set dead level or the panels will drag and the locks won’t line up. A small mistake in the flashing shows up later as water damage in the subfloor.
When you compare door installers, ask each one the same questions:
Is the price for a full frame replacement or a panel swap?
Who handles rot if you find it, and at what rate?
Is the door ENERGY STAR certified?
What warranty covers the product, and what covers the labour?
Our door installation page explains how we handle a patio door job from measuring to cleanup.
How Long Does Patio Door Installation Take?
A straightforward sliding glass door installation or patio door replacement takes about three to five hours, and a full frame replacement with repairs can take a full day. A new opening can stretch to two or three days once framing and interior finishing are included.
You don’t have to wait for spring. We install doors all winter, and the house is only open for a short time while the old door comes out. I go through this in more detail in why winter is a good time to install windows and doors.
Are There Rebates for Energy Efficient Patio Doors in Ontario?
Yes, Ontario’s Home Renovation Savings Program pays $100 per rough opening for ENERGY STAR certified windows and doors. A patio door counts as one opening.
There are conditions. You need a home energy assessment before any work starts and a second assessment with the same energy advisor after it’s done. You also have to complete at least two upgrades to get rebates. A patio door on its own won’t qualify, but a patio door plus new windows or attic insulation can. Programs like this can change or close with little notice, so check the current rules on Home Renovation Savings before you book anything.
The federal Canada Greener Homes Grant and the Greener Homes Loan are both closed to new applicants. Some websites still advertise them, so don’t count on that money.
How Long Does a Patio Door Last?
A quality vinyl or fibreglass patio door lasts about 20 to 30 years with basic care. Rollers and weatherstripping wear out sooner and usually need attention every 5 to 10 years.
These are the signs it’s time to start getting quotes:
- You can feel cold air along the bottom or sides in winter.
- There’s fog or moisture between the panes of glass.
- The door drags or jumps off its track.
- The frame is cracked, bowed, or soft near the sill.
A lot of homes in Markham built in the 1980s and 1990s still have their original sliding glass door. If yours is one of them, it’s likely near the end of its life, and a new energy efficient door will make a real difference to the comfort of that room and your energy bills.
How to Save Money on Patio Door Replacement
Most homeowners can bring their patio door replacement cost down a bit without cutting corners:
Stick with a standard patio door size if your opening allows it.
Do the patio door together with your windows, since one crew and one trip costs less per opening. Our guide to window replacement cost can help you budget both.
Ask about late fall and winter scheduling, when installers are often less booked than in the spring rush.
Get at least two written quotes with the same scope, so you’re comparing the same door and the same work.
The lowest number is rarely the best deal. A door that’s installed out of level or poorly flashed will cost you more in a few years than you saved up front.
Get a Patio Door Quote From Edmunds
If you’re pricing a new patio door, we’ll come out, check the opening and sill, and give you a written quote with no surprises. Call us at 905-472-0276, visit our door installation page, or drop by our showroom at 3400 14th Ave, Unit 28, Markham, to book your free in-home estimate.
Steve Gibson
President & CEO, Edmunds Home Improvements
Steve Gibson has over 35 years of hands-on experience in home renovation across
Markham and the Greater Toronto Area. As President and CEO of Edmunds Home
Improvements — a company serving the community since 1947 — Steve specializes in
roofing installation and repair, siding, window replacement and installation, and
door installation. A longtime local resident, he took ownership of Edmunds in 1989
and has built the company into one of the GTA’s most trusted exterior renovation
contractors. Edmunds is fully insured (WSIB and $5 million public liability) and
is a BBB Accredited Business and ENERGY STAR partner.
