21 Branch St, Boston, MA, 02108
About This Home
Positioned on Beacon Hill's desirable South Slope, 21 Branch Street is a tastefully renovated single family carriage house featuring a rare private garage. With storybook views & beaming sunlight, this elegant home offers a charming private deck, 2 bedrooms plus an oversized den/ family room (or guest bdrm) & 2 bathrooms. The gracious entry foyer w/ marble floor sets the stage for this exceptional offering. The lovely formal living, dining & open concept kitchen offers an excellent layout & sun beams into the picturesque spaces where multiple exposures show surrounding architecture & gardens. The well-appointed kitchen features granite, notable appliances, eye catching light fixtures/hardware, and an inviting island. This floor is complemented by 2 fireplaces and 8 windows. The primary suite is the entire top floor w/ more incredible sunlight, a luxurious closet and bath & a front facing deck. Fabulous suite-like 2nd bed & bath w/fireplace offer complete privacy. Truly exceptional!
Getting Around
Walker's Paradise
Rider's Paradise
Very BikeableSchools
Construction
Condition
- Year built: 1899
Materials
- Foundation: Other
- Roof: Rubber,Other
- Construction materials: Brick,See Remarks
Type & Style
- Home type: SingleFamily
- Architectural style: Carriage House,Other (See Remarks)
- Property subType: Single Family Residence
Interior
Appliances
- Appliances included: Range,Dishwasher,Disposal,Refrigerator,Freezer,Washer,Dryer
Bedroom2
- Level: First
- Area: 210
Bedrooms & Bathrooms
- Bedrooms: 2
- Bathrooms: 2
- Full bathrooms: 2
Dining Room
- Level: Second
- Area: 126
Family Room
- Level: Second
- Area: 216
Features
- Flooring: Wood
- Number of fireplaces: 3
- Fireplace: Yes
- Finished area above ground: 1,832
Heating & Cooling
- Heating features: Forced Air,Electric Baseboard
- Cooling features: Central Air,Ductless
Interior Area
- Total structure area: 1,832
- Total interior livable area: 1,832 sqft
Kitchen
- Level: Second
- Area: 126
Living Room
- Level: Second
- Area: 156
Master Bathroom
- Features: Yes
Master Bedroom
- Level: Third
- Area: 208
Property
Details
- Parcel number: 3356343
- Attached to another structure: Yes
- Zoning: Res
Features
- Patio & porch: Deck - Roof
- Exterior features: Balcony / Deck,Deck - Roof
Lot
- Lot size: 797 sqft
- Features: Gentle Sloping,Other
Parking
- Total spaces: 1
- Parking features: Attached
- Has garage: Yes
- Attached garage spaces: 1
- Covered spaces: 1
Climate Risk is Financial Risk
Every home has a financial story beyond the listing price. Below, you’ll see the climate risks that could affect this property — and in Bills & Affordability, how those risks may influence repairs, insurance, utilities, and long-term value.
Biggest Threats for This Home
- Heat Wave
- Inland Flooding
- Lightning
- Tsunami
How This Home’s Risks Compare
FEMA Declared Disasters Across Massachusetts Counties
Understanding the Costs
Financial advisors generally recommend spending no more than 30% of your gross household income on housing costs. In practice, many households stretch to 35% or beyond — especially in high-cost markets.
Estimated Costs Today
| Monthly | Annual | |
|---|---|---|
| Mortgage | $17,672 | $212,064 |
| Home Insurance * | $650 | $7,800 |
| Property Taxes | $3,355 | $40,260 |
| Electricity | $361 | $4,335 |
| Total | $22,038 | $264,456 |
Income You'd Need if You Spent...
Massachusetts FAIR Plan Programs
How Costs Could Change Over Time
Climate risk is quickly impacting all of the major home ownership costs. Adjust the growth rates and percentage of income spent on housing below to see how your housing costs could change over the next 10 years — and what income you'd need to keep up.
Comparing Against the Market
Price Per Sq Ft
vs Other Active Listings
Avg $/sqft
vs Homes Sold Last Month
Median $/sqft
Current Market Trends
Median Price Per Square Foot
The median price per square foot of homes sold in this area each month. Compare this to this listing's price per square foot to gauge whether the home is priced in line with recent sales.
Historicals for This Listing
Zestimate History ($/sqft)
Price History
| Date | Event | Price |
|---|---|---|
| 2026-05-12 | Listed for sale | $3,495,000 |
| 2025-10-06 | Sold | $3,000,000 |
| 2025-09-13 | Contingent | $3,100,000 |
| 2025-09-08 | Price change | $3,100,000 |
| 2025-06-24 | Listed for sale | $3,295,000 |
| 2023-10-13 | Sold | $3,200,000 |
| 2023-08-22 | Price change | $3,249,000 |
| 2023-05-30 | Listed for sale | $2,995,000 |
| 2023-05-23 | Contingent | $2,995,000 |
| 2023-05-18 | Listed for sale | $2,995,000 |
| 2019-06-26 | Sold | $2,395,000 |
| 2019-04-10 | Listed for sale | $2,295,000 |
| 2010-12-29 | Sold | $1,442,500 |
For Sale by Agent
View on Zillow