643 Main St Harwich — Photo 1 of 42
$1,399,000
Investment Analysis — 643 Main St
Harwich, MA 02645
Based on HUD Small Area Fair Market Rent for Barnstable Town, MA MSA, a 6-bedroom in 02645 carries an estimated $3,860/mo in gross rent — about a 2.11% cap rate and $29,539/yr in estimated NOI at the $1,399,000 list price. Adjust every assumption in the calculator below.
Beds
6
Baths
3
SqFt
2,872
Style
Single Family
Built
1919
A rare opportunity in Harwich Center! Set on approximately 1.5 acres, this one-of-a-kind property offers endless possibilities with a main home, a separate ADU with its own private driveway, and a detached mixed-use garage. With a total of 6 bedrooms, it's ideal for multigenerational living, extended family, or guests, while the ADU also provides excellent rental history. The detached garage offers incredible flexibility for a business, workshop, storage, hobby space, or additional rental opportunity, with plenty of room for vehicles, bikes, and tools. Outside, enjoy a beautifully landscaped backyard with multiple sheds ready to become a man cave, she shed, home bar, art studio, or your own private retreat around the fire pit. Properties offering this much space, versatility, and potential rarely come to market in Harwich Center. Don't miss your chance to make this truly unique property yours!
ADU Potential
Massachusetts allows one accessory dwelling unit by right in single-family zoning districts statewide (M.G.L. c. 40A §3; 760 CMR 71.00, effective Feb 2025). Estimated maximum ADU size for this property: 900 sq ft (the lesser of 900 sq ft or half the 2,872 sq ft principal dwelling). Lot size: 62,291 sq ft.
Based on listing data, which indicates the property type — not the zoning district. Local dimensional, septic (Title 5), and historic-district requirements still apply. Not legal advice — verify with the municipality.
Estimates — not financial advice
These figures are illustrative estimates for informational purposes only — not an appraisal, valuation, or guarantee of rent, income, or returns, and not financial, tax, or investment advice. Rent is either the figure reported on the MLS listing — in-place rent that may differ from market and is not verified against the actual leases — or, where the listing reports none, an estimate from HUD Small Area Fair Market Rents, a government benchmark that may differ from actual market rent. Each figure is labelled with its source. Cap rate, NOI, and returns depend on the assumptions shown, which you can change. MLS and other third-party data may be inaccurate or out of date. Verify all figures independently and consult your own financial, tax, and legal advisors before making any investment decision.
Property Details
Financials
Parking
Interior Specifications
Climate & Utilities
Building & Exterior
Property & Lot
Amenities & Appliances
Electric Water Heater • Water Heater • Range • Dishwasher • Microwave • Refrigerator • Washer • Dryer
Neighborhood
Golf • Bike Path • Conservation Area • House of Worship • Public School
Geography
Floorplan Breakdown
Structural Layout
Living Room
Lvl First18.6 x 11.6
Flooring - Wall to Wall Carpet
Dining Room
Lvl First10.8 x 11.7
Flooring - Wall to Wall Carpet
Kitchen
Lvl First16.5 x 11.7
Flooring - Wood, Kitchen Island, Cabinets - Upgraded, Recessed Lighting
Office
Lvl First9.1 x 11.6
Flooring - Wood
Family Room
Lvl First21.8 x 27.3
Flooring - Wall to Wall Carpet, Recessed Lighting
Master Bedroom
Lvl First11.7 x 17.1
Closet, Flooring - Wall to Wall Carpet
Bedroom 2
Lvl Second14 x 11.2
Bedroom 3
Lvl Second10.3 x 11.11
Closet, Flooring - Wood
Bedroom 4
Lvl Second9.4 x 8.4
Closet, Flooring - Wood
Bedroom 5
Lvl Second9.1 x 9.3
Closet, Flooring - Wood
Bathroom 1
Lvl First11.7 x 5.4
Bathroom 2
Lvl Second6.9 x 8.4
Listing Agent: Richard J. Waystack
Listing Office: William Raveis Harwich Port
MLS® Number: 73555500
