Built to Last Forever with Lifetime Warranty
We stand by our replacement windows with a lifetime warranty guarantee – meaning you’ll never need to purchase another set.

With over twenty years serving the Toronto area, we understand the difference high-quality replacement windows or doors can make to the safety, security and energy efficiency of your Toronto house, and to the overall aesthetic and feeling that your home invokes.
Address: 160 Gibson Dr Unit 13, Markham, ON L3R 3K1
Phone: 416-756-0798
E-mail: info@thermobilt.ca
Open Hours (Markham Office):
Mon-Fri: 9.30am – 5.00pm
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Get the warmth of wood without the upkeep. Fibreglass resists dents, won’t warp or rot, and stays stable through Toronto’s humidity swings. Textured skins can be stained to mimic oak, mahogany, or fir—or painted to match a contemporary palette in neighbourhoods from Maple to Markham. Insulated cores and thermal breaks improve comfort at the entry, and you can pair the slab with a multi-point lock, privacy glass, and matching sidelites or a transom for daylight.
When it’s a good fit: You want a wood-look door with minimal maintenance, a durable surface for a busy household, and reliable performance in four-season weather.
French-style operation with timeless proportions, ideal for backyards in Leaside, Oakville, and Whitby. Add operable sidelites for cross-breezes, and specify a low-profile, thermally broken threshold so the doorway stays accessible without inviting water. With proper weather-seals and adjustable hinges, these doors feel solid, close quietly, and hold their alignment through four seasons.
Security & Accessibility Upgrades
Low-profile, thermally broken threshold preserves energy performance while easing passage for strollers and mobility aids—great for multi-generational homes.
Sliding doors save space and make everyday access to decks and balconies effortless—great for townhomes in Liberty Village and high-rise suites in North York. Look for smooth, durable rollers, tight weather-seals, and a low-profile, thermally broken threshold so the door glides easily and keeps drafts out. You can add triple-pane glass for year-round comfort and laminated panes to soften traffic or backyard noise; a sturdy screen system and multi-point lock round out security and day-to-day usability.
When it’s a good fit: Tight clearances where a swinging door would be awkward, balcony or patio access used many times a day, and larger openings where you want light, views, and reliable operation.
Rigid, secure, and well-insulated, steel doors are a workhorse—especially on street-facing homes from Queen West to Danforth. Modern skins resist dents and take paint beautifully for custom colours, while foam cores and thermal breaks help keep drafts out and indoor temperatures steady. Add a multi-point lock for even seal compression, and consider privacy glass with sidelites or a transom to bring in daylight without giving up discretion.
When it’s a good fit: busy entrances that see a lot of use, homes where durability and security are priorities, and projects that want strong performance at a sensible cost.
When width matters and vertical space is tight, sliding windows are a simple, economical choice. They’re common over decks, in basements, and along side yards where a crank would get in the way. For bedrooms or basements that require egress, we size the clear opening and select hardware to meet Ontario’s building code while keeping the project straightforward and predictable.
Tip: Prioritize smooth, durable rollers and a well-drained sill. If your wall faces prevailing winds, look for strong air-leakage ratings to keep drafts down.
A timeless fit for streetscapes in Cabbagetown, Roncesvalles, and older East York, double-hung windows keep the classic look while upgrading performance. Modern balances and weather-seals tighten up drafts compared with aging wood sashes, and tilt-in sashes make second-storey cleaning easy where ladders are awkward and road dust builds up.
When to choose: When you want to preserve heritage proportions while improving efficiency—especially on upper floors where easy cleaning matters.
Bow windows—four or more panels set in a gentle arc—create a wider panoramic view and a softer exterior line than bays. They’re great for spreading light across long rooms and lifting curb appeal on broader façades. As with any projection window, performance depends on the basics done right: an insulated seat, continuous head and sill support, and meticulous flashing so the assembly stays warm and dry through the GTA’s freeze–thaw cycles.
They shine in front sitting rooms and wide elevations—think Scarborough side-splits, newer builds in Vaughan, and long living rooms in North York—where a subtle curve can brighten the entire space.
Design notes: multiple narrow lites for a smooth arc; operable end units for cross-breezes; tune low-e coatings by orientation to welcome winter sun while tempering summer gain; confirm structural support for the projection depth.
Bay windows—typically three panels with a larger centre pane flanked by two operable units—add depth, daylight, and crisp architectural definition. They’re a familiar sight on Toronto semis and Scarborough side-splits. To keep them warm and dry through freeze–thaw, we specify proper structural support, an insulated seat, and careful flashing at the roof and side returns. For heritage façades, we scale mullions to the rhythm of the street so the original character stays intact while comfort improves.
They shine in living rooms and dining nooks where light and curb appeal matter—think side streets off Roncesvalles, near Trinity Bellwoods, and older brick homes in Cabbagetown.
Design notes: use a centre picture pane for views with casement or double-hung flankers for ventilation; include an insulated seat with moisture management; and match exterior cladding and trim to existing profiles.
Top-hinged awnings can stay open during light rain—ideal above kitchen sinks and in bathrooms. They’re practical for basements in Little Italy or The Annex, where privacy matters and street-level ventilation helps. Pair an awning with a fixed picture window for views plus airflow; the combination reduces condensation by keeping interior glass temperatures more even.
When people consider awning windows, they’re usually after fresh air even in a light rain, a simple over-sink or bathroom upgrade, and better control of winter condensation.
Side-hinged sashes seal tightly against the frame, which is why casements lead many energy-efficient windows Ontario upgrades. Crank them open to capture breezes off Lake Ontario; close them and the compression seal does the winter work. For bedrooms that require egress, casements often meet code with smaller rough openings than sliders. In Toronto’s climate, casement windows offer strong draft control and energy savings, making them a smart upgrade for bedrooms and main living spaces. Casement windows deliver better air-leakage control than sliders and, in triple-pane configurations, noticeably improve winter comfort near seating areas.
Where they shine: Bedrooms needing egress; windy exposures; rooms where you sit near the glass (warmer interior pane temperatures increase perceived comfort).
Design note: Narrow sightlines and equal-lite configurations complement brick semis in homes across the GTA.
We stand by our replacement windows with a lifetime warranty guarantee – meaning you’ll never need to purchase another set.
It may be hard to find another window company in Toronto that uses Cardinal Glass in all its windows and doors products, which features Neat Glass, a self-cleaning technology that keeps windows spotless in any weather.
Your windows will stand out amongst all the homes in the GTA thanks to customizable colour and design options that complement any décor.
Without sacrificing your view with extensive tinting and glare, our energy efficient replacement windows are designed to provide superior comfort no matter the season, reflecting outside temperatures out and keeping inside temperatures in.
Our well-insulated replacement windows for Toronto homes keep heating and cooling systems from working harder than they should, lowering your energy bill and reducing your carbon footprint.