Houses for Sale in St. Marys ON Under $3 Million

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Are you looking for houses under $3m for sale in St. Marys ON? Square Yards Canada offers a wide selection of properties that cater to various budgets in St. Marys. Browse through detailed listings with HD images and guides to find the ideal property that fits your budget and preferences in St. Marys. Whether you’re looking to buy houses under under $3m in St. Marys ON for residential living or as investment opportunities, our listings allow you to filter by amenities, property age, number of bedrooms and much more. Explore a diverse range of St. Marys houses for sale under under $3m, including freehold homes, condos, and commercial properties.

Last Updated: February 12, 2026

48 Photos

187 Southvale Road, Perth, ON , MLS #X12779924 , Image - 1

187 Southvale Road St. Marys, Perth, ON MLS® X12779924

Residential Freehold (Detached)

$734900.0

4 Beds
3 Baths
1500-2000 sq-ft

Welcome to this wonderful family home in a great neighbourhood in St Mary's. Located near multiple parks, walking trails, recreation centre, Little Fa

50 Photos

32 St Andrew Street S, Perth, ON , MLS #X12760724 , Image - 1

32 St Andrew Street S St. Marys, Perth, ON MLS® X12760724

Residential Freehold (Detached)

$749900.0

3 Beds
3 Baths
2000-2500 sq-ft

Absolutely stunning 3 bedroom 1 1/2 storey home in the wonderful town of St. Marys! Prepared to be amazed by this breathtaking century home. Old world

39 Photos

25 Thames Road, Perth, ON , MLS #X12373156 , Image - 1

Unit-27, 25 Thames Road St. Marys, Perth, ON MLS® X12373156

Residential Freehold (Modular Home)

$379900.0

Price drop by 5.0%

2 Beds
2 Baths
1100-1500 sq-ft

This beautiful 8-year-old bungalow offers spacious comfort, style and low-maintenance living in the desirable Maple Lane Park community. The thoughtf

45 Photos

20 Southvale Road, Perth, ON , MLS #X12679006 , Image - 1

Unit-17, 20 Southvale Road St. Marys, Perth, ON MLS® X12679006

Residential Condo & Other (Condo Townhouse)

$434900.0

3 Beds
2 Baths
1200-1399 sq-ft

Unit 17-20 Southvale Road. Book your showing to view this well-maintained and thoughtfully updated townhome backing onto a trail. The open-concept mai

6 Photos

428 Queen Street W, Perth, ON , MLS #X12403971 , Image - 1

Unit-#5, 428 Queen Street W St. Marys, Perth, ON MLS® X12403971

Residential Condo & Other (Condo Townhouse)

$399900.0

2 Beds
1 Baths
800-899 sq-ft

Pol Quality Homes is thrilled to announce the launch of a new condominium project in St. Marys, ON. This development features beautifully designed one

7 Photos

428 Queen Street W, Perth, ON , MLS #X12403980 , Image - 1

Unit-#3, 428 Queen Street W St. Marys, Perth, ON MLS® X12403980

Residential Condo & Other (Condo Townhouse)

$369900.0

2 Beds
1 Baths
700-799 sq-ft

Pol Quality Homes is thrilled to announce the launch of a new condominium project in St. Marys, ON. This development features beautifully designed one