23-23A William St is a 4-bedroom, 2-bathroom duplex in Cornwall, listed for $289,000. It has 1500-2000 sq ft of living space.
1The main floor features two bedrooms, a 4-piece bathroom, forced-air gas heating, and a renovated kitchen.
2It retains most of the original trim and hardwood floors.
3The main-floor unit has access to portion of the basement and the main floor apt features a private front and rear porch, a private yard, and a detached heated garage workshop - a hobbyist's dream.
WELL-MAINTAINED OWNER OCCUPIED DUPLEX duplex that has been in the same family since 1955. The main-floor owner's unit is vacant, in very nice condition, and has been extremely well maintained - first by the parents and then by their son. The main floor features two bedrooms, a 4-piece bathroom, forced-air gas heating, and a renovated kitchen. It retains most of the original trim and hardwood floors. The main-floor unit has access to portion of the basement and the main floor apt features a private front and rear porch, a private yard, and a detached heated garage workshop - a hobbyist's dream. The second-floor two-bedroom apartment is leased and requires appropriate notice for all showings. Seller requires SPIS signed & submitted with all offer(s) and 1 full business day irrevocable to review any/all offer(s) with the Estate's Lawyer.
4 bedrooms, 2 bathrooms, about 1,500 sq ft, works out to roughly $193 per square foot. Chat with Zara if you'd like a deeper read on whether this duplex fits your budget and timing.
Inside 23-23A William St
Every detail from the listing, in one place.
Type
Duplex
Style
2-Storey
Living space
1500-2000 sq ftas stated on the listing
Parking
5 spacesYes garage
Basement
Full
Features & systems
Parking & garage
Garage
Yes
Parking spaces
5
Interior
Basement
Full
Lot & land
Lot size (sqft)
0
Listing & possession
Property style
2-Storey
Property class
Duplex
23-23A 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® X14112946$289,000
Sourced from MLS®. Includes earlier listings of this property on record.
What's it worth?
How 23-23A William St Compares to the Cornwall Market
Zara compares it with recent sales of similar homes nearby. It's a guide, not an appraisal.
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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
$1,420
/mo
based on the purchase price of $289,000
$57,800 cash
$231,200 financed
$194,731 total interest
Principal54%$231,200
Interest46%$194,731
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 Cornwall
Other 3–6 bed homes for sale in Cornwall around $289K.
Average days on market43Homes sold in about 43 days on average.
Sale-to-list ratio97.0%On average, homes sold below asking.
Active listings233Homes for sale here right now.
Median vs prior 90 days+4.2%Compared with Apr 26 – Jul 25, 2026: prices up.
Based on 287 sales from Jul 25 – Oct 23, 2026 (182 in the prior 90 days). Aggregate MLS® figures for closed sales; individual sold prices are shown only to signed-in members.
Questions About 23-23A William St
How much is 23-23A William St listed for?
23-23A William St is listed at $289,000 (MLS® X14112946). Summitly updates the price as soon as the MLS® record changes.
Is $289,000 a good price for 23-23A 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 Cornwall. 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 23-23A William St changed?
No — 23-23A William St is still listed at its original asking price of $289,000.
How many bedrooms and bathrooms does 23-23A William St have?
23-23A William St has 4 bedrooms and 2 bathrooms, with about 1,500–2,000 square feet of living space. It is a duplex in Cornwall.
How much would the monthly mortgage be on 23-23A William St?
About $1,420 a month — principal and interest on $289,000 with 20% down ($57,800), 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 23-23A William St compare with other homes in Cornwall?
Its asking price of $289,000 is about 31% below the median sold price in Cornwall over the last 90 days, $416,000, across 287 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 23-23A William St been sold before?
Summitly has no earlier MLS® sale or lease of 23-23A William St on record from the last two years. Older records aren't shown under TRREB rules.
Where is 23-23A William St?
23-23A William St is in Cornwall, ON. Schools, transit, parks and shops nearby are under Location & lifestyle on this page.
How long has 23-23A William St been on the market?
1 day — 23-23A William St was listed on October 22, 2026.
What is the price per square foot of 23-23A William St?
About $145 to $193 per square foot: the asking price of $289,000 over the 1,500–2,000 sq ft the listing gives as its size range.
Does 23-23A William St have parking or a garage?
Yes — the listing gives 5 parking spaces. Garage: Yes.
Does 23-23A William St have a basement, and is it finished?
