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Isothermic Portes et Fenêtres — Sherbrooke
- PVC and hybrid windows (casement, awning, sliding, tilt-and-turn, single-hung, fixed)
- Aluminum windows
- Wood windows
- Bay and bow windows and architectural shapes
- Steel and aluminum entry doors
- Patio and balcony doors
- Folding (bifold) doors
- Garage doors
- Curtain wall, window wall and unitized façade systems
- Certified installation
- Free in-store or virtual consultation and quotes
- After-sales service and replacement parts
- Financing
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A.P.S. Rénovations Inc. — Portes et fenêtres Sherbrooke
- PVC windows
- Hybrid PVC-aluminum windows
- Aluminum windows with thermal break
- Wood-interior windows
- Steel entry doors
- Fiberglass entry doors
- Storm doors (contre-portes)
- Patio doors
- Decorative door glass inserts
- Replacement thermopane sealed units
- Custom-cut glass and mirrors
- Door, window and patio-door hardware and repair parts
- Aluminum railings and decking
- Humidex humidity control systems
- Installation by certified installers
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Fenexart — Contracto 2000 inc. (Sherbrooke)
- Casement and awning windows
- Double-hung windows
- Sliding windows
- PVC windows
- Hybrid aluminum-PVC windows
- Wood and Double Nature windows
- Sealed glass unit (thermos) replacement
- Steel entry doors
- Patio doors
- Custom made-to-measure fabrication
- In-house measurement and installation
- Old window and door removal
- Energy Star / RénoClimat-eligible replacements
- Free in-home quotes
- After-sales warranty service
Windows & Doors in Sherbrooke: A Local Buyer's Guide
Sherbrooke's oldest housing was built where the water power was. Andrew Paton's woollen mill opened beside the Magog River gorge in 1867 on a 99-year lease of the river's hydraulic rights from the British American Land Company, and the workers' rows that filled in around it — a district locals nicknamed "la petite Beauce" after the region most of the hands came from — still frame the streets below Wellington. Add the seven municipalities folded in by the 2002 merger (Ascot, Bromptonville, Deauville, Fleurimont, Lennoxville, Rock Forest, Saint-Élie-d'Orford) and you get roughly 46.6% of the city's 86,019 private dwellings dating from before 1980, per the 2021 census. Much of that older stock is now rental: Sherbrooke has Quebec's highest concentration of university students at about 10.3% of its population, and plexes converted for students are where original wood sashes and mid-1980s single-hung aluminium have survived longest.
🌡️ Climate & what to buy
Begin with condensation resistance rather than glazing count. Sherbrooke sits in a river basin that pools cold air overnight — the official record low is −41.2 °C (15 January 2004), with a January daily mean around −11.9 °C — while pulling 1,100.4 mm of annual precipitation and 286.5 cm of snow. That pairing of deep cold and high moisture load is why the first complaint here is almost never heat loss through the glass; it is water beading on the frame and the bottom edge of the sealed unit by mid-January. Ask the installer for the CSA A440.2 report and look at the Temperature Index / condensation resistance figure, not just the ER number. In practice that means a warm-edge (non-metallic) spacer and a low-conductivity frame — PVC or a PVC-interior/aluminium-exterior hybrid, which is the dominant choice in the Estrie market — rather than a thermally broken all-aluminium unit that will still sweat at −25 °C. Triple glazing with two low-E coatings and argon is the ordinary way to reach the ENERGY STAR Canada threshold (ER ≥ 34 or U ≤ 1.22 W/m²·K), which is the level Rénoclimat requires for its grant, so it is worth specifying whether or not you claim the money. Second priority, and a genuinely local one: exposure. Homes on the escarpment above the Magog gorge, on the flanks of Mont-Bellevue, and on the open western subdivisions of Rock Forest take wind-driven rain hard. Ask what CSA A440 air (A), water (B) and wind-load (C) ratings the quoted product carries and whether they were chosen for your exposure or are simply the manufacturer's base rating. On mill-era and Vieux-Nord masonry openings, also confirm how the sill pan and flashing will be detailed — brick openings a century old rarely drain the way a modern rough opening does.
📋 Permits & bylaws
Sherbrooke publishes a plain "Un permis ou non?" test, and replacing doors and windows appears explicitly on the list of work allowed with no permit or certificate — provided you keep the same dimensions and all four of the city's conditions hold: foundations, framing and partitions are not modified; floor area and volume are not increased; the estimated cost of the work (materials plus labour, taxes excluded, and counting all work together) is under $25,000; and the building is not inside a PIIA area. Break any one of those and you need a permit or certificate of authorization first. Enlarging an opening, cutting a new one, or converting a window to a patio door changes the dimensions and triggers an application on its own. The PIIA condition is the one that catches Sherbrooke owners off guard. PIIA — rendered as SPAIP on the city's English pages — is by-law no. 1205, and the city runs an interactive PIIA map plus Appendices 1 and 2 of the by-law so you can check an address before signing anything. Reporting on the by-law has described four classes of heritage control across 56 zones, ranging from a class where the window model can be changed freely to a class where the original architectural elements of the whole exterior envelope must be respected and damaged parts conserved, repaired, or reproduced in materials of the same nature and form. Applications in the more restrictive classes go through the borough CCU and, for the tightest class, need a favourable recommendation from the central CCU as well; the city's own guidance says to plan for additional delay when SPAIP approval is required. On fees, a construction permit for a main building runs $254 plus $5 per additional $1,000 of declared work value, capped at $3,385; certificates of authorization and other permit types are priced separately in by-law no. 1202 (see section 1.3.7). Verify current thresholds and fees with the Division des permis before you order product — by-law amounts change.
💰 Rebates & incentives
These are commonly available as of mid-2026; verify current details and amounts directly with each program before you count on them. Rénoclimat is the provincial program that actually covers glazing: it pays $150 per eligible opening for doors and windows certified ENERGY STAR for Quebec's climate, and it is strictly replacement in an existing opening — a new opening, a re-glaze, a sash swap, or a frameless door does not qualify. Rénoclimat is audit-gated, so book the pre-work energy evaluation before the installers arrive; doing the work first forfeits the grant, and the post-work evaluation releases payment. Total Rénoclimat assistance is capped per dwelling (reported at $38,500 across all measure types), which matters if you are also doing insulation or air sealing in the same year. Hydro-Québec's LogisVert does not cover doors and windows — it handles heat pumps and other equipment — so do not let a salesperson fold it into a windows quote; the two programs are complementary, not stackable on the same glass. On the federal side, the picture has changed and older quotes are stale: the Canada Greener Homes Grant is closed to new applicants and the Canada Greener Homes Loan stopped accepting applications on 1 October 2025, which ends the roughly $250-per-opening federal top-up that used to combine with Rénoclimat. What replaced it is income-tested: the Canada Greener Homes Affordability Program was extended to Quebec on 29 June 2026, delivered in coordination with the province and Hydro-Québec, and offers no-cost retrofits to low- and median-income owners and renters — worth checking eligibility if your household qualifies, though its emphasis is insulation, air sealing and heat pumps rather than glazing. Sherbrooke does not currently advertise a municipal windows subsidy of its own, so budget on Rénoclimat alone unless your income qualifies you federally.
📅 Best time to install
Sherbrooke's booking calendar is bent by its students before it is bent by its weather. Quebec leases turn over on 1 July, and with roughly 40,000 postsecondary students returning by late August, owners of plexes around the Université de Sherbrooke, Mont-Bellevue and Lennoxville all chase the same handful of July-and-August slots to get work done in a vacant unit. If you are an owner-occupier competing with that, book outside it. The second local constraint is paperwork: if your address falls inside a PIIA zone under by-law 1205 — most of the Vieux-Nord does — the CCU review adds weeks that no installer can compress, so start the application in late winter for a fall install. Then the province-wide construction holiday takes the last two weeks of July out of the calendar entirely. What is left, and what actually works best here, is late August through mid-October: openings are dry, sealants and low-expansion foam cure properly above about 5 °C, and crews are not yet racing the first hard frost. January and February are the cheapest months to get a quote and the worst months to have a wall open on a gorge-side lot.
Serving neighbourhoods across Sherbrooke: Vieux-Nord — the 1890–1920 merchant and professional houses north of the centre, Queen Anne and Second Empire, and the district most likely to sit inside a PIIA/SPAIP zone under by-law 1205; expect CCU review and expect to match original sash divisions and profiles. · Centre-ville and Wellington Sud — mill-era brick and the workers' rows that grew around the Paton complex on the Magog River gorge; masonry openings, tall narrow proportions, and sill and flashing details that need rebuilding rather than reusing. · Mont-Bellevue — the borough around the Université de Sherbrooke, heavy on 1950s–70s bungalows and split-levels plus plexes converted for students; large single-hung and slider openings from the 1980s are the common replacement job. · Fleurimont — Sherbrooke's postwar east side, one of the seven municipalities merged in 2002, dominated by modest 1950s–70s detached homes and duplexes where the original wood or early-aluminium units are now well past service life. · Lennoxville — the anglophone borough around Bishop's University, with Victorian brick alongside 1960s stock; a mix of heritage-sensitive frontages and straightforward suburban replacements within a few blocks of each other. · Rock Forest–Saint-Élie–Deauville — the largely post-1990 western suburbs annexed in 2002, on open, wind-exposed lots where the argument is less about heritage matching and more about water-tightness and wind-load ratings.
Why Hire a Local Window & Door Expert in Sherbrooke?
Working with a local professional in Sherbrooke means faster service, climate-right materials, and someone who knows Quebec building codes and stands behind the work.
- ✅ Faster response times — local crews schedule estimates and installs quicker than out-of-town providers.
- 🌡️ Climate-specific advice — they know which materials perform best in Sherbrooke.
- 📋 Permits & bylaws — avoid delays or fines with a contractor who knows the local rules.
- 🔧 Reliable aftercare — if an issue arises, your contractor is a call away, not in another city.
- ⭐ Trusted reputation — local businesses live and die by word-of-mouth and reviews.
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Common Window & Door Services in Sherbrooke
Local pros in Sherbrooke handle everything from energy-efficient upgrades to full entryway transformations. The most-requested services:
Window Replacement & Installation
Upgrade old or damaged windows with energy-efficient double-pane, triple-pane, or low-E glass units.
Door Replacement & Installation
Improve curb appeal and security with quality front doors, patio sliders, and custom entry systems.
Sliding & French Patio Doors
Add functionality and natural light with space-saving sliding doors or elegant French doors.
Custom Window Solutions
Bay windows, bow windows, or oversized picture windows for unique architectural needs.
Energy-Efficient Upgrades
ENERGY STAR® certified windows and insulated doors built for Sherbrooke's climate.
Window & Door Repairs
Fix cracked frames, foggy glass, faulty locks, and weather stripping — without full replacement.
Retrofit & Full-Frame Installation
Choose retrofit (keeping the existing frame) or full-frame installation for a complete upgrade.
Condensation & Draft Solutions
Resolve air leaks, poor sealing, and moisture build-up for better indoor comfort.
Average Cost of Windows & Doors in Sherbrooke, Quebec
Costs vary by material, size, style, and installation method. Typical Sherbrooke price ranges:
| Service Type | Average Cost (Installed) |
|---|---|
| Standard Vinyl Window (per unit) | $450 – $900 |
| Triple-Pane Window (per unit) | $700 – $1,200 |
| Bay or Bow Window | $2,000 – $4,000+ |
| Entry Steel Door | $1,000 – $1,800 |
| Fiberglass Entry Door | $1,500 – $2,500 |
| Sliding Patio Door | $1,200 – $2,800 |
| French Door (Double) | $1,800 – $3,500 |
Frequently Asked Questions
How does Mullions choose the top 3 companies in Sherbrooke?
Each business is evaluated against our 30-point review standard — reputation, customer reviews, licensing, online presence, and business integrity — before being featured.
Is it free to request quotes in Sherbrooke?
Yes. Submitting the quote form is completely free for homeowners, and your request goes to all featured companies in Sherbrooke at once.
Do I need a permit to replace windows or doors in Sherbrooke?
Sherbrooke publishes a plain "Un permis ou non?" test, and replacing doors and windows appears explicitly on the list of work allowed with no permit or certificate — provided you keep the same dimensions and all four of the city's conditions hold: foundations, framing and partitions are not modified; floor area and volume are not increased; the estimated cost of the work (materials plus labour, taxes excluded, and counting all work together) is under $25,000; and the building is not inside a PIIA area. Break any one of those and you need a permit or certificate of authorization first. Enlarging an opening, cutting a new one, or converting a window to a patio door changes the dimensions and triggers an application on its own. The PIIA condition is the one that catches Sherbrooke owners off guard. PIIA — rendered as SPAIP on the city's English pages — is by-law no. 1205, and the city runs an interactive PIIA map plus Appendices 1 and 2 of the by-law so you can check an address before signing anything. Reporting on the by-law has described four classes of heritage control across 56 zones, ranging from a class where the window model can be changed freely to a class where the original architectural elements of the whole exterior envelope must be respected and damaged parts conserved, repaired, or reproduced in materials of the same nature and form. Applications in the more restrictive classes go through the borough CCU and, for the tightest class, need a favourable recommendation from the central CCU as well; the city's own guidance says to plan for additional delay when SPAIP approval is required. On fees, a construction permit for a main building runs $254 plus $5 per additional $1,000 of declared work value, capped at $3,385; certificates of authorization and other permit types are priced separately in by-law no. 1202 (see section 1.3.7). Verify current thresholds and fees with the Division des permis before you order product — by-law amounts change.
What does it cost to replace windows in Sherbrooke?
Most windows run $450–$1,200 per unit installed depending on material and glass; a full-home project is typically $8,000–$18,000. See the price table below.
How soon will companies respond?
Most featured local companies respond within one business day.
Windows & Doors in Nearby Cities
- 📍Montreal
- 📍Quebec City
- 📍Laval
- 📍Gatineau
- 📍Longueuil
- 📍Saguenay
- 📍Levis
- 📍Trois-Rivières
- 📍Terrebonne
- 📍Repentigny
- 📍Saint-Jean-sur-Richelieu
- 📍Drummondville