Cornerstone Drafting and Design
“Hi Darryl, thanks for all your designs to help us make Melly's Workplace + Cafe so beautiful!”
Best Architects in Oshawa, ON
15 firms listed · 5 in Oshawa · 1 open 24/7 · 5 open weekends · 10 rated 4.5+
Data verified October 19, 2026
Ashley Designers
“The quality of their workmanship is outstanding, and their customer service is exceptional.”
Bronze Plaque USA
Benan Hanoudi Architectural Services
Cord Coordinated Design Inc.
Canada Hvac Design
“Adam is great to work with, very responsive.”
The 15 firms listed for Oshawa, ON 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: Oshawa, ON
5 of the 15 firms we list are based in Oshawa; the other 10 serve Oshawa from towns including Bowmanville (13 km), Whitby (8 km) and Ajax (16 km). 11 of the firms on this page have a rating, from 4.3 to 5.0 across 79 reviews; 10 are rated 4.5 or higher. 1 is open around the clock; 5 are open on Saturdays and 3 on Sundays. Domain records put 6 websites of the firms on this page at ten or more years old; the oldest dates from 2000. 1 offers emergency call-outs; 1 gives free estimates and 1 lists coupons or special offers. We have a website on file for all 15 of the firms on this page; 11 publish a contact page; 13 list a public email and 2 take bookings online. 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.
Does it matter if the firm is outside Oshawa?
5 of the 15 firms give an address in Oshawa, and the others come from other towns within 35 km. Familiarity with the municipality counts, because zoning bylaws and permit practice differ from one city to the next. Ask what they have had approved locally and how site visits will be handled.
RC Mechanical Inc
Hernez Design
“Over the pass years HERNEZ have been consistently growing and improving to the must high standards on the design and construction”
Durham Drafting and Design
“I gave Mike some sketches of a shed I had imagined, and he created drawings with everything up to legal standards.”
Mackitecture Inc.
“They listened to my design thoughts and were able to translate those into both unique and practical designs that worked in the subdivision.”
Barry Bryan Associates
Vizion Media Inc.
“Ray is very prompt, professional and competent.”
Danlyn Design
“Not only did he help us with the permit process as well, but when issues arose with the permit department themselves, Vlad was so fast at helping us get things sorted so the approvals could go through!”
J. R. Freethy Architect
AA Frias Architect Inc.
Why these companies made our list
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