Full-Service Door and Window Care for Thornhill
Replacing a door is straightforward. Working out whether you actually need to is the harder part, and it is where most quotes go wrong. Windows & Doors Thornhill gives Thornhill owners a genuine assessment first, then handles whatever follows, from a hinge adjustment to complete window installation.
Our coverage runs from single-family homes to commercial storefronts, with the same standard of finish on both.
Assessment Before Sales
We measure and test before quoting, because a guess on the phone helps nobody.
Available When It Breaks
Failures rarely happen at a convenient hour. Our emergency crews work outside the schedule.
Costs You Can Plan Around
Fixed quotes let you budget properly instead of bracing for the invoice.
Finished to a Standard
Sealed, squared, tested, and cleaned. We do not consider a job done until all four are true.
Four Ways New Openings Improve a Property
Not a sales pitch, just what actually changes once the old units come out and modern ones go in.
Money Back Every Winter
An old window leaks heat continuously. Replacing it converts that constant loss straight into a lower monthly bill.
Stronger Position at Sale
New windows and doors remove the most common negotiating point a buyer has, and they photograph well.
Meaningful Security Gains
Modern frames resist prying and modern locks resist picking, in ways that decades-old hardware was never designed to.
Noticeably More Comfortable
The draught disappears, the noise drops, and the rooms hold their temperature from morning to night.
Complete Services in Thornhill
Door Repair
Most door faults are alignment rather than damage, and replacing the door fixes nothing if the frame moved. Property owners in Thornhill use Windows & Doors Thornhill for door repair, covering diagnosis, hinges, latches, frames, and weather seals.
Door Replacement
Swapping a door without addressing the threshold and seals just moves the draught somewhere else. Property owners in Thornhill use Windows & Doors Thornhill for door replacement, covering measurement, removal, fitting, thresholds, and weather seals.
New Door Installation
Putting a door where none existed means framing, headers, and finishes, not just the door itself. Property owners in Thornhill use Windows & Doors Thornhill for new door installation, covering framing, headers, fitting, trim, and making good.
Window Repair
Most windows written off as needing replacement need hardware and seals instead. Homeowners in Thornhill use Windows & Doors Thornhill for window repair, covering hinges, handles, gaskets, glazing units, and honest replacement advice.
Window Replacement
Replacement is worth it when the frame has gone; before that it is usually money spent early. Homeowners in Thornhill use Windows & Doors Thornhill for window replacement, covering survey, removal, fitting, insulation, sealing, and finishing.
New Window Installation
Cutting a new opening is structural work before it is glazing work, and the lintel comes first. Property owners in Thornhill use Windows & Doors Thornhill for new window installation, covering lintels, opening formation, fitting, and making good.
Built to Still Be Working in Twenty Years
Steel-Backed Frame Rigidity
The reinforcement is what keeps the sash meeting the seal evenly two decades in, which is where most of a window's long-term performance actually lives.
Recent Projects, Real Results
From new windows to entry doors, browse recent installations completed by our team.
Why Homeowners & Businesses Choose Us
Quality products, dependable service, and results that last — here is what sets our team apart.
Properly Insured Crews
One Number, No Drift
Booked Fast, Finished Fast
Long-Standing Technicians
What People Said Afterwards
Our front entry near Bayview Glen needed a full replacement. Windows & Doors Thornhill handled the frame, the sidelight, and the threshold, and the seal is genuinely airtight.
The kitchen window around Doncrest had a failed hinge and would only open two inches. Replaced the same visit and it swings wide again.
We had our patio slider over by Crestwood serviced before winter. New rollers, cleaned track, and a new lock. Money well spent.
Our unit just off Old Thornhill had a lock that would only work if you lifted the handle. They found the frame had settled and corrected the alignment.
Locked out of the house out toward Thornhill Woods on a Sunday. Same rate as a weekday, which I did not expect, and inside in half an hour.
Two upstairs windows at our place near Royal Orchard were misted through. New sealed units in and the bedrooms hold their heat properly now.
The office door around Grandview needed access control after we lost track of the keys. Fobs issued, old keys retired, and a log we can actually read.
Our storm door over by Brownridge had rusted hinges and a torn screen. Both replaced and it looks and works like a new door.
The glass in our back door just off Uplands cracked in the cold snap. Measured, ordered, and fitted inside a week with a temporary panel meanwhile.
Our back door lock out toward German Mills had started catching. Serviced rather than replaced, and they explained exactly why that was the right call.
Our Service Areas
Don't see your area listed? We likely still serve you — just ask.
The Things People Ask Before Booking
Most standard vinyl windows in Thornhill land between $650 and $1,400 installed, and the three things that move the number are the size of the opening, whether it is a slider or a casement, and the glass package you choose. A bay or bow window is its own quote and usually runs $2,200 to $4,500. We measure every opening and price it as its own line, so you can see exactly what adding or dropping one does to the total.
A typical eight to ten window home is one to two days on site, and a single entry door is a half day. We take out, fit and seal one opening at a time rather than stripping the whole house at once, so your home is never standing open and you can carry on around us. Custom sizes and special-order glass add 3 to 6 weeks before the install day, and you get that date when you order rather than when you chase us for it.
No. Windows & Doors Thornhill measures and quotes at no cost and with nothing attached to it. A full house takes about 45 minutes: we check every opening, look at the frames and sills for rot or water damage, and tell you what genuinely needs replacing against what has years left in it. The written quote reaches you the same week, itemised opening by opening rather than as a single number.
Every window we fit meets or beats the ENERGY STAR requirement for this climate zone, with low-E coated, argon-filled sealed units as the standard rather than an upgrade you pay extra for. On a Thornhill home replacing single pane or failed double glazing, most people notice the difference first in the draughts and the cold spots near the glass rather than on the bill. If your existing windows are still sound we will say so.
Our installation workmanship carries a 10 year warranty and Windows & Doors Thornhill honours it regardless of which of our crews did the original fitting. The windows themselves keep their manufacturer warranty, which on the sealed units and vinyl frames runs 20 years to lifetime depending on the line you pick. If a seal fails inside that period we handle the claim with the manufacturer ourselves instead of handing you a phone number.
Yes, and we do it right through the Thornhill winter. Each opening is out, in and sealed inside about an hour, so the house never drops more than a degree or two, and we work one room at a time with the rest of the home closed off. The foams and sealants we use are rated for cold weather installation. If the temperature or the wind makes it genuinely unsafe we move your date rather than push through it.
We remove and dispose of every old window and door, vacuum the work area and haul the debris away the same day — that is included, not a line added at the end. A straight replacement in an existing opening needs no permit in most Thornhill municipalities. If the project changes the size of an opening or cuts a new one then a permit is required, and we prepare the drawings and file the application for you.
Windows & Doors Thornhill carries full liability insurance and WSIB coverage, and we will send the certificates before any work starts if you would like them on file. Our own installers do the work — booked jobs are never passed to a subcontracted crew you have never met — and the person who quoted your job is there on the day. They walk every opening with you before packing up and show you how each new unit operates and locks.
Still have questions?
We are here to help. Reach out and our team will get you a clear answer.
Contact UsHere for Urgent and Planned Work
Emergency door and glass repairs plus planned window installations across Thornhill, all through the same Windows & Doors Thornhill team.
Call Any Time
Emergencies get answered around the clock. Everything else gets a reply within the working day.
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Confidential, always.
