421 Brock St is a 3-bedroom, 3-bathroom semi-detached home in Brockville, listed for $628,000. It has 1100-1500 sq ft of living space.
1Endless possibilities!
2The primary bedroom offers a walk-in closet and stunning ensuite.
3Enjoy the convenience of main-floor laundry, a cozy fireplace in the living room and patio doors leading to your new private deck - your very own outdoor oasis!
ONE PROPERTY. Endless possibilities! What an opportunity to own a newer (2010) legal semi-detached home offering the perfect combination of lifestyle, flexibility and income potential! Imagine the possibilities! Live on the main floor while rental income from the lower-level suite helps offset your mortgage and living expenses. Tired of condominium living? Enjoy the freedom of homeownership without monthly condo fees, with a tenant occupying the other unit. Perfect for multi-generational living, larger or extended families, or investors looking for income potential. So many options! THE MAIN FLOOR: Step inside and discover a beautifully designed open-concept layout featuring 1,246 sq. ft. of living space, a chef-inspired kitchen, dining area and living room - perfect for everyday living and entertaining! The primary and second bedrooms showcase new plank LVP flooring. The primary bedroom offers a walk-in closet and stunning ensuite. Enjoy the convenience of main-floor laundry, a cozy fireplace in the living room and patio doors leading to your new private deck - your very own outdoor oasis! You'll love entertaining here! THE LOWER LEVEL: Currently tenanted, this impressive 1,059 sq. ft. living space features its own separate entrance and offers an open-concept living room, dining area and kitchen, a generously sized bedroom with ample closet space, and a beautiful 4-piece bathroom. Carpet-free throughout, this is a wonderful self-contained living space offering privacy and independence.Additional features include a freshly painted main floor, new deck and new patio door/window. Conveniently located close to shopping, amenities, parks and the Brockville Country Club.Whether you're looking to supplement your income, accommodate family or enjoy a spacious home with added flexibility, this property checks all the boxes! Why settle for one possibility when you can have so many? Book your private showing today!
3 bedrooms, 3 bathrooms, about 1,100 sq ft, works out to roughly $571 per square foot, the bed-to-bath ratio is generous. Chat with Zara if you'd like a deeper read on whether this semi-detached fits your budget and timing.
Inside 421 Brock St
Every detail from the listing, in one place.
Type
Semi-Detached
Style
Bungalow
Living space
1100-1500 sq ftas stated on the listing
Parking
4 spaces
Basement
Apartment, Finished
Features & systems
Parking & garage
Parking spaces
4
Interior
Basement
Apartment · Finished
Lot & land
Lot size (sqft)
4929.87
Listing & possession
Property style
Bungalow
Property class
Semi-Detached
421 Brock 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® X14159584$628,000
Sourced from MLS®. Includes earlier listings of this property on record.
What's it worth?
How 421 Brock St Compares to the Brockville 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
$3,085
/mo
based on the purchase price of $628,000
$125,600 cash
$502,400 financed
$423,153 total interest
Principal54%$502,400
Interest46%$423,153
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.
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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 Brockville
Other 2–4 bed homes for sale in Brockville around $628K.
Average days on market50Homes sold in about 50 days on average.
Sale-to-list ratio97.8%On average, homes sold below asking.
Active listings167Homes for sale here right now.
Median vs prior 90 days+8.1%Compared with May 11 – Aug 9, 2026: prices up.
Based on 126 sales from Aug 9 – Nov 7, 2026 (111 in the prior 90 days). Aggregate MLS® figures for closed sales; individual sold prices are shown only to signed-in members.
Questions About 421 Brock St
How much is 421 Brock St listed for?
421 Brock St is listed at $628,000 (MLS® X14159584). Summitly updates the price as soon as the MLS® record changes.
Is $628,000 a good price for 421 Brock St?
Summitly rates it Well Above Market: the asking price is 15% or more above Zara's estimate, an estimate built from recent sales in Brockville. 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 421 Brock St changed?
No — 421 Brock St is still listed at its original asking price of $628,000.
How many bedrooms and bathrooms does 421 Brock St have?
421 Brock St has 3 bedrooms and 3 bathrooms, with about 1,100–1,500 square feet of living space. It is a semi-detached home in Brockville.
How much would the monthly mortgage be on 421 Brock St?
About $3,085 a month — principal and interest on $628,000 with 20% down ($125,600), 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 421 Brock St compare with other homes in Brockville?
Its asking price of $628,000 is about 45% above the median sold price in Brockville over the last 90 days, $432,450, across 126 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 421 Brock St been sold before?
Summitly has no earlier MLS® sale or lease of 421 Brock St on record from the last two years. Older records aren't shown under TRREB rules.
Where is 421 Brock St?
421 Brock St is in Brockville, ON. Schools, transit, parks and shops nearby are under Location & lifestyle on this page.
How long has 421 Brock St been on the market?
1 day — 421 Brock St was listed on November 6, 2026.
What is the price per square foot of 421 Brock St?
About $419 to $571 per square foot: the asking price of $628,000 over the 1,100–1,500 sq ft the listing gives as its size range.
Does 421 Brock St have parking or a garage?
Yes — the listing gives 4 parking spaces.
Does 421 Brock St have a basement, and is it finished?
The listing describes the basement as: Apartment, Finished.
