New patio doors · Mississauga
Choosing and installing a new patio door
First, make sure the door needs replacing. Sticking and a lock that won't catch are usually rollers and hardware; see sliding door repair. A new door makes sense when the frame is soft or bent, water gets past it whatever you do, or the door is wrong for the room. Then the rules matter as much as the style: the opening size, the glass, and whether a condo board or a heritage plan has a say. We connect you with an independent local installer who measures, quotes and does the work.
- Sliding, French and tilt-and-turn
- Permit and approval rules explained
- Independent installers quote the job
Door styles
Sliding, French or tilt-and-turn: what fits the opening
Start with the opening and the floor space in front of it.
Sliding
One panel slides past a fixed one, so nothing swings into the room. It suits a narrow deck, a balcony or furniture near the door, and it's the usual like-for-like swap.
French
Two hinged panels give the full width when open but need room to swing. They can't take a standard sliding screen; many owners add a retractable screen.
Tilt-and-turn
One hinged panel that also tilts in at the top for air. It seals on all four sides and has no bottom track, but the panel is heavy and swings inward.
City permits
Same-size swap or a wider opening: the permit rule
The City of Mississauga doesn't require a building permit to replace a door with one of the same size. A new door or a bigger opening does need one, and zoning rules apply even without a permit. Confirm on the City's building permit page before you sign.
Measure the rough opening
The rough opening is the framed hole in the wall, not the door you see. The installer measures it and checks whether a stock size fits.
Same size: no City permit
A new door in the existing opening, with the header untouched, is a replacement. Condo and heritage approvals still apply where they exist.
Wider or new: permit first
Widening a slider or cutting a new opening changes the wall's structure. That needs a building permit and usually a new header over the door.
Glass and ratings
Safety glass and ENERGY STAR: what a new door should have
Ontario's Building Code calls for safety glass, tempered or laminated, in sliding glass doors. New patio doors come with it, and the installer confirms what the current code asks for yours.
Tempered or laminated
Tempered glass breaks into small, blunt pieces. Laminated glass cracks but holds together, and it softens traffic noise on a busy road.
ENERGY STAR certified
Certification means the door was tested for how well it holds heat. The label and listing count for a rebate, not a sales description.
Heritage district
Heritage district note: patio doors in Meadowvale Village
The Meadowvale Village plan asks owners to keep original doors where they can, and allows French patio doors only where they can't be seen from the public realm. Door work that follows the plan needs a Clearance to Alter from the City, a quick approval. A new or enlarged opening needs a Heritage Property Permit. The plan covers the village only, not the wider Meadowvale neighbourhood. Our heritage village guide covers both districts.
What affects the quote
Pricing a new patio door: the main factors
Every quote is built from the door and the opening:
- Door type and width, and how many panels
- Frame material and colour, including a condo's colour rule
- Glass: double or triple, low-E, laminated, blinds between the panes
- A stock size or a door made to order
- What the sill and subfloor look like after removal
- Trim, flooring and exterior finishing, and access to a suite
Measure the width and height of the opening inside the trim and send it with photos from inside and out. The installer measures again before ordering.
Condo buildings
Condo and condo-townhouse doors
In a condo tower, the balcony door is often a common element. The board may plan to replace every door in the building together, and it usually sets the frame colour and style. To change yours sooner, you need the board's approval before any order, often with an agreement that makes you responsible for the door afterwards.
Condo townhouses often follow the same rules. Check the declaration, then read the condo door replacement guide. Other door jobs are on the doors and screens page.
Ontario rebates
Rebates for ENERGY STAR doors
Ontario's Home Renovation Savings Program offers rebates on ENERGY STAR certified windows and doors, generally through a home energy assessment. New glass in an old door doesn't qualify; a full certified door can. Check the current rules before booking. If windows are going too, see replacement windows.
Common questions
Patio door replacement questions
Explore your options
Before you choose a new door
Local installers replace patio doors across the city, including Erin Mills, Meadowvale, Churchill Meadows, Applewood and Port Credit.
Measure the door opening and send a photo
Send the width and height with photos from inside and out, and say whether it's a house, a condo townhouse or a suite. We pass it to a local installer who quotes the door that fits.