4379 William St is a 3-bedroom, 1-bathroom detached home in Frontenac, listed for $549,900. It has 1500-2000 sq ft of living space.
1Nestled in the quaint village of Harrowsmith, sits this well maintained and updated three bedroom, two-storey home.
2Some of the features include; a front porch, large fenced rear yard, a firepit, 1.5 bathrooms, laundry on the second floor and a mudroom for extra storage.
3The home has a warm and cozy feel throughout, book your showing, you won't be disappointed.
Nestled in the quaint village of Harrowsmith, sits this well maintained and updated three bedroom, two-storey home. Some of the features include; a front porch, large fenced rear yard, a firepit, 1.5 bathrooms, laundry on the second floor and a mudroom for extra storage. The home has a warm and cozy feel throughout, book your showing, you won't be disappointed.
3 bedrooms, 1 bathroom, about 1,500 sq ft, works out to roughly $367 per square foot. Chat with Zara if you'd like a deeper read on whether this detached fits your budget and timing.
Inside 4379 William St
Every detail from the listing, in one place.
Type
Detached
Style
2-Storey
Living space
1500-2000 sq ftas stated on the listing
Parking
3 spaces
Basement
Partial Basement
Features & systems
Parking & garage
Parking spaces
3
Interior
Basement
Partial Basement
Lot & land
Lot size (sqft)
5445
Listing & possession
Property style
2-Storey
Property class
Detached
4379 William 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® X14149954$549,900
Sourced from MLS®. Includes earlier listings of this property on record.
What's it worth?
How 4379 William St Compares to the Frontenac Market
Zara compares it with recent sales of similar homes nearby. It's a guide, not an appraisal.
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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
$2,701
/mo
based on the purchase price of $549,900
$109,980 cash
$439,920 financed
$370,528 total interest
Principal54%$439,920
Interest46%$370,528
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 Frontenac
Other 2–5 bed homes for sale in Frontenac around $550K.
Average days on market53Homes sold in about 53 days on average.
Sale-to-list ratio94.0%On average, homes sold below asking.
Active listings318Homes for sale here right now.
Median vs prior 90 days−0.5%Compared with May 8 – Aug 6, 2026: prices down.
Based on 186 sales from Aug 6 – Nov 4, 2026 (153 in the prior 90 days). Aggregate MLS® figures for closed sales; individual sold prices are shown only to signed-in members.
Questions About 4379 William St
How much is 4379 William St listed for?
4379 William St is listed at $549,900 (MLS® X14149954). Summitly updates the price as soon as the MLS® record changes.
Is $549,900 a good price for 4379 William St?
Summitly rates it Excellent Deal: the asking price is 10% or more below Zara's estimate, an estimate built from recent sales in Frontenac. 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 4379 William St changed?
No — 4379 William St is still listed at its original asking price of $549,900.
How many bedrooms and bathrooms does 4379 William St have?
4379 William St has 3 bedrooms and 1 bathroom, with about 1,500–2,000 square feet of living space. It is a detached home in Frontenac.
How much would the monthly mortgage be on 4379 William St?
About $2,701 a month — principal and interest on $549,900 with 20% down ($109,980), 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 4379 William St compare with other homes in Frontenac?
Its asking price of $549,900 is about the same as the median sold price in Frontenac over the last 90 days, $550,000, across 186 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 4379 William St been sold before?
Summitly has no earlier MLS® sale or lease of 4379 William St on record from the last two years. Older records aren't shown under TRREB rules.
Where is 4379 William St?
4379 William St is in Frontenac, ON. Schools, transit, parks and shops nearby are under Location & lifestyle on this page.
How long has 4379 William St been on the market?
1 day — 4379 William St was listed on November 3, 2026.
What is the price per square foot of 4379 William St?
About $275 to $367 per square foot: the asking price of $549,900 over the 1,500–2,000 sq ft the listing gives as its size range.
Does 4379 William St have parking or a garage?
Yes — the listing gives 3 parking spaces.
Does 4379 William St have a basement, and is it finished?
The listing describes the basement as: Partial Basement.
