L’Assomption · old town to the Ange-Gardien
Windows and doors in L’Assomption
Made for the old town and the newer streets
New windows and doors in L’Assomption, made to your openings at the factory, fitted by our own crews and quoted on paper.
- ★ 4.5 · 484 Google reviews
- RBQ licensed
- Free in-home estimate
- 9,200+ projects · 35+ years
- Canadian-made, ENERGY STAR-certified windows
- Installed by our own crews
- Rénoclimat paperwork done with you, up to $300 per eligible window
★★★★★“Excellent customer service and flawless install. Windows came out amazing.”Marco S., Google review, September 2026
Get your free in-home estimate
Four quick steps. No pressure, no obligation.
- ★ 4.5 · 484 Google reviews
- RBQ 5735-2130-01
- Free written quote
- 9,200+projects across Greater Montréal
- 35+years installing windows and doors
- 4.5★average Google rating
- RBQlicensed contractor 5735-2130-01
What a house in L’Assomption asks of its windows and doors
L’Assomption has 23,442 residents (2021 census) over about 99 km². The centre sits on a peninsula shaped by the bends of the L’Assomption river. It became a town on 1 January 1888, and the Collège de l’Assomption dates from 1832.
A heritage core with its own inventory
The city’s by-law lists heritage buildings from a 2007 study of the town’s built heritage. The list includes addresses on rang de l’Achigan. If your house is on that list, the windows and the front door are part of what the city reviews.
Old-town streets in their own planning sector
The streets around Saint-Ignace, Saint-Ursule, Saint-Joseph and Sainte-Anne carry their own planning sector. A new door or window on the street side is seen by every neighbour, and the city may review it. We bring frame colour and grille samples to the front step, not only to the kitchen table.
Newer streets along the Ange-Gardien
The by-law treats the residential stretch of boulevard de l’Ange-Gardien as a village-style sector. On a house there, a change of window should follow the spirit of the original style. We draw each opening on the quote so you can see what stays and what changes.
Rang de l’Achigan and the heritage list
Rang de l’Achigan appears on the city’s heritage inventory. On older houses we never assume a standard size. We measure the rough opening and the wall depth, then order the unit to fit.
Does L’Assomption require a permit to replace windows and doors?
Often yes, and in the old town a PIIA review can come on top. We read the city’s by-law 302-2015 and its PIIA by-law 156-2008 and its amendments on 12 November 2026. The city says its compilations have no legal value, so confirm with the city.
The permit rule for renovations
By-law 302-2015 requires a building permit to renovate a main building. The exception covers work that costs $3,000 or less in labour and materials. Even then, the work must leave the foundations and structure alone, must not close an existing window or add a new one and must not replace the exterior cladding. Read article 73 in the by-law.
PIIA reviews exterior changes in named sectors
Under by-law 156-2008 as amended in 2011, exterior renovation or modification of a main building in a PIIA sector goes to the council for approval. A job that does not change the architecture or outward appearance is exempt. The city lists the sectors in its PIIA by-law page. Among them are the Saint-Ignace, Saint-Étienne, Saint-Jacques, Saint-Pierre and Saint-Jean-Baptiste sectors and a north heritage sector.
Window criteria on the Ange-Gardien
In the residential sector of boulevard de l’Ange-Gardien between rue Beaupré and rue Tardif, a window change must follow the original style. An opening may grow by 20% at most, and openings should be taller than wide. Amending by-law 156-9-2012 sets these criteria.
One call to the planning division
Call the urban planning division at 450 589-5671 or write to bureauducitoyen@ville.lassomption.qc.ca. Give your address, the number of openings and their sizes. Our quote names every opening with its size and style, and you can attach it.
WindowsuPVC and hybrid, triple-pane, double Low-E glass
Front entry doorsSteel or fiberglass, with decorative glass options
Patio doorsSliding and stackable patio doors
Garage doorsInsulated garage doors, installed with the restHow we serve L’Assomption
Vieux-L’Assomption and the church quarter
About 49 km and 47 minutes from our Saint-Laurent showroom, without traffic. We photograph the façade and bring samples of frame colours so that you can judge them against the brick or stone.
Rue Saint-Ignace and the old-town streets
50 km and 48 minutes. These streets sit in a PIIA sector, so we plan the visit around the questions the city will ask.
Ange-Gardien and rang de l’Achigan
48 km and 45 minutes to the Ange-Gardien, 51 km and 49 minutes to rang de l’Achigan. Each house here gets its own measured quote.
L’Assomption is 48 to 51 km from our showroom
From our Saint-Laurent showroom at 1190 Rue Bégin, our crews reach L’Assomption by Highway 40 east and the regional roads beyond. We got each time from OpenStreetMap road routing to the named place. It is rounded and assumes free-flowing roads.
- Vieux-L’Assomption (église, rue Saint-Pierre)49 km · 47 minDirections
- Boulevard de l’Ange-Gardien48 km · 45 minDirections
- Rue Saint-Ignace50 km · 48 minDirections
- Rang de l’Achigan51 km · 49 minDirections
A few recent projects
How your project runs
- Free in-home estimate
An estimator measures every opening and checks the frames.
- Written quote
Products, finishes and installation work, confirmed in writing.
- Installation by our crews
Our own installers do the work, covered by the 25-year transferable warranty.
- Rénoclimat
We prepare the paperwork with you, up to $150 per eligible opening.
“Excellent customer service and flawless install. Windows came out amazing.”
Marco S., Google review, September 2026
Questions L’Assomption owners ask
Must I get a permit before changing windows in L’Assomption?
The by-law asks for a building permit for most renovations of a main building. Work that costs $3,000 or less is exempt only if it also leaves openings and cladding alone. Confirm with the planning division before you order.
What does PIIA mean in L’Assomption?
It is a review of how exterior changes fit the look of the area. In the old-town sectors and for listed heritage buildings, the council approves the plans. Ask if your address is covered.
Can I change the size of a window in the old town?
It depends on the sector. On the Ange-Gardien stretch, the by-law caps growth at 20% and asks for openings taller than wide. We draw the proposed size on the quote.
Is a patio door possible for my L’Assomption house?
Yes. We take the rough opening on site and place the order at that size. Whether it slides, swings or spans a wide wall, the quote is in writing.
Can I get a Quebec grant for new windows?
Yes. According to Québec’s Rénoclimat page, updated 13 October 2026, each window can earn $300. A house is capped at $4,500 and a larger building at $6,000. The program terms on quebec.ca decide eligibility, and we help with the paperwork.
Get your free L’Assomption estimate at home
We measure at your home and send a written quote.
Sources
- Ville de L’Assomption, Règlement 302-2015 relatif à l’administration des règlements d’urbanisme (compilation administrative, sans valeur légale)
- Ville de L’Assomption, Urbanisme: règlements PIIA 156-2008 et modifications (page lue le 2026-11-12)
- Ville de L’Assomption, Division urbanisme et développement du territoire (page lue le 2026-11-12)
- Centris.ca, L’Assomption: profil de la population (Recensement 2021, Statistique Canada)
- Wikipédia, L’Assomption
- Gouvernement du Québec, Rénoclimat: nouveautés (page mise à jour le 2026-10-13)
- OpenStreetMap Nominatim and OSRM, driving distances from 1190 Rue Bégin