42 Union St is a 3-bedroom, 1-bathroom detached home in St. Catharines, listed for $349,900. It has 1100-1500 sq ft of living space.
1Approved shovel-ready triplex development opportunity in St.
2Calling all investors,builders, and savvy buyers.
3Situated in a desirable neighbourhood close to schools,Montessori and childcare centres, parks, public transit, shopping, and everyday amenities, withconvenient access to downtown St.
Approved shovel-ready triplex development opportunity in St. Catharines! Calling all investors,builders, and savvy buyers. This is a rare chance to begin construction immediately with anapproved triplex permit already in hand, avoiding months of planning delays and significantsoft costs. Plans are completed for approximately 3,900-4,000 sqft of total build, designed asthree self-contained residential units featuring efficient layouts, multiple washrooms, andmodern exterior elevations tailored for strong rental appeal. Ideal for investors seekinglong-term hold cash flow, a BRRRR strategy, or builders looking for a ready-to-go project withapprovals secured and equally attractive for a buyer looking to live in one unit and rent theother two for supplemental income. Situated in a desirable neighbourhood close to schools,Montessori and childcare centres, parks, public transit, shopping, and everyday amenities, withconvenient access to downtown St. Catharines, Brock University, the Pen Centre, and majorroutes. A turnkey multi-unit opportunity in a growing rental market.
3 bedrooms, 1 bathroom, about 1,100 sq ft, works out to roughly $318 per square foot. Chat with Zara if you'd like a deeper read on whether this detached fits your budget and timing.
Inside 42 Union St
Every detail from the listing, in one place.
Type
Detached
Style
1 1/2 Storey
Living space
1100-1500 sq ftas stated on the listing
Parking
2 spaces
Basement
Partial Basement, Unfinished
Features & systems
Parking & garage
Parking spaces
2
Interior
Basement
Partial Basement · Unfinished
Lot & land
Lot size (sqft)
0
Listing & possession
Property style
1 1/2 Storey
Property class
Detached
42 Union St Price & Sale History
Earlier listings of this property, list-price changes, and the most recent annual property tax on the listing.
For saleListedThis listingMLS® X13791532$349,900
Sourced from MLS®. Includes earlier listings of this property on record.
What's it worth?
How 42 Union St Compares to the St. Catharines Market
Zara compares it with recent sales of similar homes nearby. It's a guide, not an appraisal.
Independent mortgage broker · OAC · rates subject to change and underwritingMortgage Squad →
Referral disclosure: Summitly may refer you to Mortgage Squad Advisors, an affiliated mortgage partner. You are free to choose any lender or mortgage professional.
Monthly cost
Enter a rate to see the monthly cost
An estimate, not a quote. Utilities and insurance are extra.
Affordability calculator
Estimated monthly payment
$1,719
/mo
based on the purchase price of $349,900
$69,980 cash
$279,920 financed
$235,766 total interest
Principal54%$279,920
Interest46%$235,766
20% down · 25-yr amortization · 5.50% rate. Principal & interest only — taxes, condo fees, and insurance not included.
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Figures are Summitly estimates for illustration only — not from TRREB or the MLS® feed, and not a mortgage approval, appraisal, or financial advice.
Rental income potential
Est. monthly rent
low–high
Gross yield
rent × 12 ÷ price
Cap rate (est.)
net of tax + fees
Summitly AI estimate for discussion only — not from TRREB or the MLS® feed, and not an appraisal or investment advice. Yield and cap rate are derived from the estimated rent versus the asking price.
For homeowners nearby
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Mortgage financing is arranged through Mortgage Squad Advisors. Summitly is the technology platform that powers this site. Estimated values, AI insights, calculator results, and rental projections shown on this page are generated by Summitly and are not provided by, reviewed by, or sourced from TRREB, the MLS®, or the listing brokerage; they are not appraisals or opinions of value. The trademarks REALTOR®, REALTORS®, and the REALTOR® logo are controlled by the Canadian Real Estate Association (CREA) and identify real estate professionals who are members of CREA. The Coldwell Banker® name and logo are trademarks of Coldwell Banker Real Estate LLC.
Similar homes for sale nearby in St. Catharines
Other 2–3 bed homes for sale in St. Catharines around $350K.
Average days on market39Homes sold in about 39 days on average.
Sale-to-list ratio96.4%On average, homes sold below asking.
Active listings726Homes for sale here right now.
Median vs prior 90 days+1.8%Compared with May 12 – Aug 10, 2026: prices up.
Based on 526 sales from Aug 10 – Nov 8, 2026 (506 in the prior 90 days). Aggregate MLS® figures for closed sales; individual sold prices are shown only to signed-in members.
42 Union St is listed at $349,900 (MLS® X13791532). Summitly updates the price as soon as the MLS® record changes.
Is $349,900 a good price for 42 Union St?
Summitly rates it Excellent Deal: the asking price is 10% or more below Zara's estimate, an estimate built from recent sales in St. Catharines. The rating is an automated opinion, not an appraisal; "What's it worth?" on this page shows how it is worked out. See Zara's estimate
Has the price of 42 Union St changed?
No — 42 Union St is still listed at its original asking price of $349,900.
How many bedrooms and bathrooms does 42 Union St have?
42 Union St has 3 bedrooms and 1 bathroom, with about 1,100–1,500 square feet of living space. It is a detached home in St. Catharines.
Is 42 Union St close to transit?
The nearest rapid-transit station is St. Catharines GO Station (Lakeshore West GO), about 780 m (about a 10-minute walk) in a straight line. Distances are straight-line, not walking routes; check the transit agency for routes and schedules.
How much would the monthly mortgage be on 42 Union St?
About $1,719 a month — principal and interest on $349,900 with 20% down ($69,980), a 25-year amortization and an assumed 5.5% interest rate. The mortgage calculator on this page lets you change the down payment, amortization and rate.
How does 42 Union St compare with other homes in St. Catharines?
Its asking price of $349,900 is about 38% below the median sold price in St. Catharines over the last 90 days, $559,950, across 526 closed sales on the TRREB MLS®. A city median mixes every type and size of home, so the comparable sales on this page are the closer guide.
Has 42 Union St been sold before?
Summitly has no earlier MLS® sale or lease of 42 Union St on record from the last two years. Older records aren't shown under TRREB rules.
Where is 42 Union St?
42 Union St is in St. Catharines, ON. Schools, transit, parks and shops nearby are under Location & lifestyle on this page.
How long has 42 Union St been on the market?
53 days — 42 Union St was listed on September 16, 2026.
What is the price per square foot of 42 Union St?
About $233 to $318 per square foot: the asking price of $349,900 over the 1,100–1,500 sq ft the listing gives as its size range.
