Key Takeaways
•The Starting Layer: Two public sources give averages for all Dorchester rentals, not just three-deckers. On Oct. 23, 2026, ApartmentFinder.com listed $2,395 for a one-bedroom, $3,230 for a two-bedroom and $4,186 for a three-bedroom. On Oct. 22, 2026, Boston Pads listed $2,396, $2,742 and $3,142. They are a first input, not a final answer, and the two sources differ most on the larger units.
•The Trap: Many tidy "Dorchester" rent tables online are for Dorchester County, Maryland. There, HUD's fiscal year 2027 (FY2027) three-bedroom benchmark is just $1,605.
•The Market Right Now: Boston Pads put the average Dorchester monthly rent at $3,163 on Oct. 22, 2026, down 3.0% from a year earlier and down from $3,245 on Aug. 31. One condo, 246 Boston St. #1, cut its ask from $3,600 to $3,100 between Jun 9 and Sep 3. One listing is not a trend.
•The Bottom Line: Dated closed leases in MLS PIN, the listing database Massachusetts agents use, which marks a listed rental as leased, carry more proof than any average. HUD's Boston-area figures work as a check, and asking rents mark a ceiling.
Why Is the First Dorchester Rent Table You Find From Maryland?
If you own or plan to buy a Dorchester three-decker, you need to know what each unit should rent for right now. You may be pricing a vacancy, planning a renovation or testing whether the rents can help carry the mortgage.
A search for "Dorchester rent by bedroom" often returns clean tables for Dorchester County, Maryland. They look reliable. They come from HUD, they are current for FY2027 and they are broken out by bedroom count. Sites like BNBCalc also repackage them by ZIP code under "Dorchester" headlines.
But Dorchester County is on Maryland's Eastern Shore. Its ZIP codes, such as 21613, start with 216 or 218, not with Boston's 021.
HUD's FY2027 figures for Dorchester County, Maryland are:
•$970 for a one-bedroom
•$1,159 for a two-bedroom
•$1,605 for a three-bedroom
Three three-bedroom units at $1,605 equal $4,815 a month. Used as a Boston ceiling, that figure would understate income and the building's value. A Boston three-decker needs Boston ZIP codes, checked across several sources.
What Does a Dorchester Three-Decker Rent for by Bedroom Count?
ApartmentFinder.com listed Oct. 23, 2026 averages across all Dorchester rentals of $2,395 for a one-bedroom, $3,230 for a two-bedroom and $4,186 for a three-bedroom. Boston Pads' Oct. 22, 2026 averages were $2,396, $2,742 and $3,142. The one-bedroom figures agree. The two- and three-bedroom figures do not, and the three-bedroom gap is about $1,000 a month. Both sets include apartment buildings, condos and multi-family units.
For many three-deckers, the two- or three-bedroom rent is the key number. Floor-through units often have more bedrooms, and larger units usually drive the building's value.
That does not mean every three-bedroom rents for the average. Condition, layout, parking, laundry, transit and walkability all move the number. Apartments.com gives Dorchester a walkability score of 50 out of 100.
How Should You Build the Right Dorchester Rent Ladder?
Build it in layers, ranked by how much proof each one carries.
Layer 1: MLS PIN closed leases. These are signed leases, and they carry the most proof of the three layers. Comps are similar nearby units that recently leased in the same Boston ZIP code, sorted by bedroom count, condition and layout. Older "Class C" units, which are less updated, belong in a separate group from gut-renovated ones. Class C here is an agent's label for older, less-updated units, not a building class from a data provider.
Layer 2: HUD Boston-area figures. HUD publishes a Small Area fair market rent, a federal rent benchmark set for each ZIP code. Its FY2027 figure for Boston's ZIP 02124 is $2,650 for a two-bedroom. The illustrative range runs from $2,385 to $2,915.
FY2027 HUD SAFMR bands for ZIP 02124 by bedroom count
HUD FY2027 Small Area Fair Market Rents and illustrative 90%/110% bands for ZIP 02124, effective October 1, 2026.
90%
SAFMR
110%
| Series | Label | Value |
|---|---|---|
| 90% | Studio | $1,917 |
| SAFMR | Studio | $2,130 |
| 110% | Studio | $2,343 |
| 90% | 1 bedroom | $2,007 |
| SAFMR | 1 bedroom | $2,230 |
| 110% | 1 bedroom | $2,453 |
| 90% | 2 bedrooms | $2,385 |
| SAFMR | 2 bedrooms | $2,650 |
| 110% | 2 bedrooms | $2,915 |
| 90% | 3 bedrooms | $2,862 |
| SAFMR | 3 bedrooms | $3,180 |
| 110% | 3 bedrooms | $3,498 |
| 90% | 4 bedrooms | $3,159 |
| SAFMR | 4 bedrooms | $3,510 |
| 110% | 4 bedrooms | $3,861 |
That is $580 (18%) below ApartmentFinder.com's $3,230 two-bedroom average and $92 (3%) below Boston Pads' $2,742. The HUD figure works as a check for older units, not as a renovated comp. For units leased through the Housing Choice Voucher program, current payment standards come from the local housing authority.
Layer 3: Asking rents from sites like Zumper. These show what landlords hope to get. They mark a ceiling, and each needs a date.
Dates matter. A condo at 246 Boston St. #1 asked $3,600 on Jun 9, 2026, per Redfin listing history. By Sep 3, its asking rent was $3,100. The listing came down on Sep 22.
246 Boston St #1 asking rent cuts in 2025–2026
MLSPIN rental event history for the 1-bed, 622-square-foot unit at 246 Boston St #1 in Dorchester.
| Series | Label | Value |
|---|---|---|
| Asking rent | May 20, 2025 - Listed for Rent | $3,500 |
| Asking rent | May 29, 2025 - Rental Removed | $3,500 |
| Asking rent | Jun 9, 2026 - Listed for Rent | $3,600 |
| Asking rent | Aug 19, 2026 - Listed for Rent | $3,400 |
| Asking rent | Aug 21, 2026 - Price Changed | $3,400 |
| Asking rent | Sep 3, 2026 - Price Changed | $3,100 |
| Asking rent | Sep 22, 2026 - Rental Removed | $3,100 |
If you price too high, you may lose more in vacancy than you gain in rent.
Long-held three-deckers often have units leased below current market rents. The gap may be real, but it closes only as leases turn over.
What Does the Class C vs. Renovated Spread Mean for Your Rent Roll?
The spread is the difference between what current leases actually pay and a renovated closed-lease rent. It is a test, not guaranteed income.
You can usually count it only after a unit turns over naturally or after a real renovation. Even then, vacancy time, renovation costs and lease-up costs come off the rent.
One listing's cuts show how fast an ask can move. They do not measure the market.
Upfront costs matter too. Massachusetts law (M.G.L. c.186, s.15B) lets a landlord collect only these at the start of a lease, and since Aug. 1, 2025 the same limit also binds the landlord's agent:
•first month's rent
•last month's rent
•a security deposit of no more than one month's rent
•the purchase and installation cost for a key and lock
Who pays the broker fee is a cost to model. Under the Massachusetts broker-fee law that took effect Aug. 1, 2025, the person who hires the broker pays the fee (Mass.gov, checked Oct. 23, 2026). If it falls to the owner, it adds to lease-up costs.
In May 2026 the Boston Globe quoted the CEO of BostonPads saying many landlords raise rents or list properties themselves to avoid the broker fee. NBC Boston reported in September 2026 that renters who believe they were charged a broker fee by a broker they did not hire can file a complaint with the Attorney General's Office.
One industry source's view is that some higher asking rents may be cost recovery. That is a claim, not a measured finding.
On June 23, 2026, the Supreme Judicial Court ruled that the statewide rent-control question could not go on the November 2026 ballot because it included a religious-facilities exemption (WBUR, read Oct. 23, 2026). Supporters have hinted they could try again in 2028. The proposed cap would have exempted owner-occupied buildings with four or fewer units, according to Shelterforce. The current status of any new proposal is a question for an attorney.
One conservative test: If the rent spread shrinks, does this building still work?
What Are the Strongest Arguments Against This Approach?
The main objection has three parts. First, investors and lenders use Zumper-style asking rents. Second, closed leases plus HUD checks are overkill for a three-unit building. Third, the wrong-Dorchester error is too obvious to matter.
The error is less obvious than it seems. BNBCalc's "Dorchester" Section 8 (housing-voucher) table, a third-party site, lists a $1,850 three-bedroom figure for Maryland ZIP 21835. An automated data pull could drop that into a Boston model.
A small building leaves less room for a miss. In a three-unit building, each unit is roughly a third of the rent roll. At 246 Boston St., the asking rent fell $500 in under three months, from $3,600 to $3,100, per the listing data above. On one unit, a $500 miss adds up to $6,000 a year. Lenders weigh rent when they size a loan, so a miss can matter there too.
Asking rents work as a first screen. Closed leases show what units actually leased for.
Another fair pushback is that HUD fair market rents are not market rents. That is correct. They help you gauge older Class C units. Renovated rents should come from closed MLS PIN leases in the right Boston ZIP codes.
For older units, comparing dated closed leases with the HUD figures for the Boston ZIP code is a useful test. If they line up, the Class C rents look realistic.
Which Dorchester Rent Numbers Carry the Most Proof in 2026?
Boston ZIP codes carry the proof here, and Maryland tables do not. Among Boston figures, dated closed leases carry the most.
The neighborhood-wide averages from ApartmentFinder.com and Boston Pads are a starting reference. Both include all property types.
Dated MLS PIN closed leases, adjusted for ZIP code, condition, unit size and timing, outrank those averages.
A rent-roll test looks at:
1. ZIP code: in Boston, not Maryland.
2. Date: every rent figure carries one.
3. Rank: closed leases above averages and asking rents.
4. Comps: current rents kept separate from renovated comps.
5. Unit size: compared by bedroom count.
6. Costs: vacancy, broker and renovation costs subtracted.
7. A rent roll built on current leases is a more conservative test than a best-case rent for every unit.
A rent roll built on dated closed leases shows how much room a building has if rents or policy change.
Dated closed leases in the building's own Boston ZIP code are the comparison that matters against the averages above.
This article is general information, not legal or tax advice. Talk to your CPA and attorney about your own situation.
