Plan Architecture
“The measurement was done well and the technologist took care of all the small problems of the project.”
Best Architects in Longueuil, QC
15 firms listed · 9 in Longueuil · 1 open 24/7 · 1 open weekends · 12 rated 4.5+
Data verified October 21, 2026
YHS Architecte
“I had my house plans drawn up by YHS Architecte, very good service, the house is superb.”
Planimage Inc
“Very professional throughout plan creation, suggestions and honest with plan costs.”
Groupe PDA Inc.
Plani Studio
GR7 Architecture
The 15 firms listed for Longueuil, QC provide architectural services. The building types they take, the services they include and the registrations they claim are taken from their own websites, and the ratings and quotes come from public reviews.
Area overview: Longueuil, QC
9 of the 15 firms we list are based in Longueuil; the other 6 serve Longueuil from Montreal (4 km). The firms on this page are rated from 4.0 to 5.0 across 497 reviews; 2 have 50 or more reviews and 12 are rated 4.5 or higher. When customers rate these firms on specific qualities, they most often praise professionalism (91%), responsiveness (68%) and quality (62%). 1 is open around the clock and 1 is open on weekends. 1 shows a licence on its website. 7 have ten or more years of experience, the longest 30 years. 1 offers emergency call-outs. We have a website on file for 14 of the firms on this page; 10 publish a contact page and 10 list a public email. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book.
What can an architect's website tell me?
14 of the 15 firms here give a web address. Look for photographs of finished buildings rather than renderings, and for work of your type and scale. A firm that designs schools and a firm that designs laneway houses are answering different questions, and the portfolio usually says which one you are looking at.
Boudrias & Legare
Signalisation Saic Inc
LLA Architecture
Montréal Designers Incorporée
Construction Daniel Dargis Inc.
“He was generous of his time and clearly explained to me all the documents and services that I was entitled to request from the contractor in question.”
Groupe SP Réno Urbaine
“A big special thank you to our project manager Jean-François!”
Ciccariello Architecture
“Great service, very good knowledge of construction...”
Tangible Architecture
“Superb experience with Alexandre for the realization of my renovation plans for my Triplex!”
Guillaume Lévesque Architect
“In its design, it was able to navigate well and respect certain space restrictions in order to optimize the limited space.”
Why these companies made our list
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