
21 Old Colony Rd Harwich — Photo 1 of 42
$849,000
21 Old Colony Rd, Harwich, MA 02645
Harwich, MA 02645
Beds
4
Baths
2
SqFt
2,031
Style
Single Family
Built
1965
Set on a spacious 1.3-acre lot in desirable Harwich Center, this 3-bedroom, 2-bath Cape offers exceptional space, versatility, and potential. The home features an enclosed porch, a flexible floor plan, and a one-car garage. An additional detached one-bedroom ADU has been completely gutted and is ready to be finished—ideal for guest accommodations, extended family, a home office, studio, or potential rental income, subject to town approvals. The expansive lot offers plenty of room to create a private outdoor retreat, with potential for a pool or future expansion. Ideally located near Brooks Park for pickleball and recreation, the Cape Cod Rail Trail, Harwich Center shops and restaurants, and the beaches, dining, and boutiques of Harwich Port. A unique opportunity with endless possibilities in the heart of Harwich!
Market Value Analysis
* Analysis is based on 23 actively listed and recently sold comparable properties strictly within Harwich, MA.
Property Details
Financials
Parking
Interior Specifications
Climate & Utilities
Building & Exterior
Property & Lot
Amenities & Appliances
Electric Water Heater
Geography
Population
11,288
U.S. Census Bureau, ACS 2024 5-Year Estimates (B01003)
Median Household Income
$104K
U.S. Census Bureau, ACS 2024 5-Year Estimates (B19013)
Renter-Occupied Homes
15.6%
U.S. Census Bureau, ACS 2024 5-Year Estimates (B25003)
New Construction Permits — Barnstable County
505 housing units permitted in the last 12 months (-51% vs the prior 12 months) — 123 in 5+ unit buildings
U.S. Census Bureau, Building Permits Survey (through Jul '26)
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 2,031 sq ft principal dwelling). Lot size: 58,117 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.
Listing Agent: Natalia Weiner
Listing Office: Gibson Sotheby's International Realty
MLS® Number: 73566214
Browse More Homes in Harwich
Explore other active listings in the area.
$724,900240 Chatham RdHarwich, MA3 bd2 ba1,732 sqft
$1,150,70021 Mill Pond RdHarwich, MA4 bd3 ba2,163 sqft
$1,395,0004 Aarons WayHarwich, MA4 bd3 ba2,900 sqft
$2,100,0005 Cliffs WayHarwich, MA4 bd4 ba3,107 sqft
$729,000129 BelmontHarwich, MA3 bd1 ba1,116 sqft
$1,299,000643 Main StHarwich, MA6 bd3 ba2,872 sqft


