Window repair Newmarket
Newmarket is the coldest place we work, at 4,260 heating degree-days. Fogged, cracked and sweating windows fixed with new glass in your existing frame.
What to do while you wait.
Keep children, pets, and anyone without proper footwear away from the broken glass. Shards can scatter several feet from the break point.
Glass still attached to the frame can fall without warning and cause deep cuts. Leave loose pieces alone until our technician arrives.
If you must walk near the area, wear closed-toe shoes and work gloves. Thin slippers or bare feet are a serious hazard.
Use a heavy tarp, thick cardboard, or plastic sheeting secured with tape to block wind, rain, and debris until we arrive.
Take photos of the damage from both inside and outside. These help our technician prepare the right glass size and type before arriving.
Call 647-803-2730. Our emergency line is staffed 24/7 including nights, weekends, and holidays.
Overview
Newmarket is the coldest place we work. Building-code climate data rates it at 4,260 heating degree-days against 3,520 at Toronto City Hall, about 21% more heating demand and the highest figure in the GTA list. That shows up on the glass as more condensation on the room side and more winter cracks. In most homes the fix is new glass in the frame you already have.
The housing is mostly postwar and later: detached houses and townhouses around a 19th-century Main Street that is protected as a heritage district. Newmarket was settled from 1801 by Quaker families from Vermont and Pennsylvania, its population rose from 5,000 to 11,000 between 1950 and 1970, Upper Canada Mall opened at Yonge and Davis in 1974, and Highway 404 later pulled development east. By 2021 the town had 87,942 people in 31,239 private dwellings, 60% of them single-detached houses.
Newmarket's rules make a glass repair simple. Glass-only replacement keeps the existing frame, so it does not change the opening at all, and the Town's rules go further: even replacing doors or windows that are the same size as existing does not need a building permit, while creating new openings or increasing the size of them does. On Lower Main Street South, the heritage conservation district covering 72 properties, the Town exempts repairing broken window panes to original specifications from heritage permits, so a like-for-like pane repair can go ahead and only a whole-window swap or a design change needs approval first.
OhMyGlass Window and Door Repairs replaces the sealed unit or pane and keeps the frame. On cold-facing windows that sweat we will quote a warmer glass option if the frame can take it, and on Main Street we match the original glass so the repair stays within the heritage exemption. If a frame has failed, we will tell you it is a window-replacement job rather than a glass repair.
What fails where in Newmarket
Typical sealed-unit life is 10 to 25 years, and south-facing units often last less than 12. A house with 20 windows and original 1990s glass will usually have at least one fogged unit.
19th century onward, with older and heritage-sensitive windows. Broken panes, sash and glazing wear.
windows here have often been replaced once already, so it is the later-generation sealed units and worn cranks that fail.
original double-pane sealed units now past typical life, plus thermal cracks.
duplex units are 7% of Newmarket dwellings, a higher share than in Vaughan, Markham or Richmond Hill, so landlord or condo rules may decide who pays.
a crack that starts at the edge and runs straight in. It cannot be repaired, so the glass or sealed unit is replaced.
Living with the coldest glass in the GTA
Newmarket has recorded −35.2 °C and averages 122.2 cm of snow a year. By the national building-code climate-zone thresholds, 4,000 to 4,999 heating degree-days is Zone 6, while downtown Toronto at 3,520 falls in Zone 5.
at 21 °C indoors, double glazing tolerates about 41 to 49% relative humidity at −18 °C outside, falling to 32 to 39% at −29 °C. A cheap hygrometer tells you where you are.
and keep blinds open so room air reaches the glass.
when their sealed units are replaced. Classic NRC data shows triple glazing tolerating about 49 to 53% humidity at −29 °C, against 32 to 39% for double.
the centre of a pane can reach 15 to 25 °C while the edge in the frame sits at −10 °C or colder. Half-closed blinds, partial shade and heating vents aimed at the glass all add to the risk.
triple sashes are 30 to 50% heavier, so a triple unit often will not suit an existing frame. For a glass repair, low-E, argon and a warm-edge spacer are the usual upgrade, and triple pane that needs a new frame is a window-replacement job.
Where to go next in Newmarket
The service page that matches your job, and the nearest city hub.
Frequently asked questions: Newmarket window repair
Do I need a permit to replace window glass in Newmarket?
Generally not. Replacing a sealed unit inside an existing frame does not change the opening at all, and the Town of Newmarket lists even same-size window or door replacement as work that does not need a building permit. Creating new openings or enlarging existing ones does. Heritage rules apply separately on Lower Main Street South.
Can I fix a broken window on Main Street without a heritage permit?
Yes, if you repair it to the original specifications. The Town exempts repairing broken window panes to original specifications from heritage permits in the Lower Main Street South Heritage Conservation District, which covers 72 properties. Changing the window's design or replacing it outright counts as an alteration and needs a heritage permit.
Why do my Newmarket windows get so much condensation?
Mostly because it is colder here. Newmarket is rated at 4,260 heating degree-days against 3,520 downtown, and the colder the outside, the lower the indoor humidity the inside pane can take before it sweats. Keep winter humidity toward the low end of Health Canada's 30 to 50% range, run fans, and open blinds.
Is triple pane more worth it in Newmarket than in Toronto?
Somewhat more, because Newmarket has about 21% more heating degree-days than downtown, so both the energy saving and the condensation benefit are larger. It still only works where the frame can carry the thicker, heavier unit. In most existing frames, a low-E, argon replacement unit is the realistic upgrade.
Do you cover the newer neighbourhoods east of Yonge?
Yes, all of Newmarket, from the Main Street heritage district and downtown to the Yonge and Davis corridor and the newer neighbourhoods toward Highway 404.
Guides for this job
Local guide
Newmarket is rated at 4,260 heating degree-days, against 3,520 at Toronto City Hall, making it about 21% colder by heating demand and the coldest location in the GTA list.
Glass-only replacement doesn't change the opening, and Newmarket's building rules don't require a permit even for same-size window or door replacement; new or enlarged openings do need one.
The Lower Main Street South Heritage Conservation District covers 72 properties, and repairing broken window panes to original specifications is exempt from heritage permits.
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