Duplexes in St. Louis MO 2026: Prices, Rents, and the Catch
The short version: St. Louis is not on the Foothold Index. 46 of 343 listings survived the screen, but the median surviving deal leaves an owner-occupant $1,369 a month worse off than renting comparable space. Entry price is $315,000; the problem is the payment, not the price tag.
Why St. Louis duplexes fail the Foothold screen
Every listing goes through seven checks and a single failure removes it. In St. Louis, of 343 listings:
- 292 of 343 failed the neighborhood violent-crime ceiling.
- 186 of 343 failed the abandoned-property (other-vacant) ceiling.
- 60 of 343 failed the gross-yield ceiling: a yield above 25%, which usually means a repair bill wearing a rent number.[S3]
Listings can fail more than one check, so these counts overlap. The dominant one here is the neighborhood violent-crime ceiling. The 46 that cleared everything are the only buildings the numbers below describe.
How much does a duplex cost in St. Louis in 2026?
What the two prices mean: entry ($315,000) is the 25th percentile of the 46 surviving listings and typical ($365,000) is their median price. Both are list prices. The monthly figures on this page are for a different surviving listing, which I call the median deal: a 2-unit, 4-bedroom building at $335,000 in ZIP 63109.
What is the average rent in St. Louis in 2026?
A one-bedroom in St. Louis rents for about $1,048 a month, the average of Zumper’s and Apartment List’s asking rents for mid-2026. The model scales that figure by ZIP with HUD’s FY2026 Small Area Fair Market Rents, so a building in a cheaper ZIP is measured against a cheaper rent. A two-bedroom is about $1,180 on HUD’s FY2026 small-area fair market rents, the median across 30 ZIPs, and $1,425 on Zumper’s asking-rent data for June 2026.
What you pay each month living in one unit and renting the other
The full payment on the median surviving deal, with an FHA loan at 3.5% down and a 6.71% 30-year fixed rate, is $3,277 a month including mortgage insurance, property tax and insurance. The rented unit brings in $1,064. After a 19% maintenance and vacancy allowance, about $859 of that counts, so your share of the month is about $2,418, against $1,048 to rent a one-bedroom nearby. That gap is why St. Louis did not make the ranked list.
How the mortgage rate changes the gap in St. Louis
| Mortgage rate | Median deal, per month, versus renting |
|---|---|
| 5.00% | $1,010 behind renting |
| 5.50% | $1,112 behind renting |
| 6.00% | $1,216 behind renting |
| 6.50% | $1,323 behind renting |
| 6.71% (model rate) | $1,369 behind renting |
| 7.00% | $1,433 behind renting |
| 7.50% | $1,544 behind renting |
What this means for you: even at 5.00% the median deal is $1,010 a month behind renting, so no realistic rate cut closes the gap here. The building has to be cheaper, or the rent higher, before this works.
How much income do you need to buy a duplex in St. Louis?
- Full payment$3,549On the typical building at 6.71%
- Income, front-end guideline$137,390Payment at 31% of gross income
- Income, back-end guideline$99,04843%, with no other debt
- Median household income$81,679What the median household here earns
On the typical $365,000 building the full payment at 6.71% is about $3,549 a month. FHA’s front-end guideline (payment at 31% of gross income) puts that at $137,390 a year. The back-end guideline (43%, with no other debt) puts it at $99,048. An FHA lender can also count 75% of the second unit’s rent toward your income. The median household here earns $81,679.
The assistance test: HUD puts the St. Louis area median income at $113,500 for a four-person household (FY2026). Most down payment programs cap eligibility at 80% of that, which HUD publishes as $90,800 for four people and $63,600 for one. The $137,390 front-end figure above sits $46,590 over that four-person limit. Household size and each program’s own cap decide it.
Down payment and assistance for a St. Louis duplex
Renting the other unit to a Section 8 voucher tenant in St. Louis
- The tenant pays a share set from income. The housing authority pays you the rest, up to a cap called the payment standard.
- The payment standard is set by ZIP code. For scale, HUD’s FY2027 metro-wide two-bedroom Fair Market Rent for the St. Louis, MO-IL HUD Metro FMR Area, in effect from October 1, 2026, is $1,349 (FY2026: $1,218), and a basic-range payment standard runs from 90% to 110% of the published figure that applies.
- The tenant’s share is capped at move-in. When the rent is above the payment standard, a family moving in cannot take on a share above “40 percent of the family’s adjusted monthly income”.
- The unit passes an inspection first. HUD is moving voucher inspections to its newer NSPIRE standard, but under Notice PIH 2026-18 housing authorities “may continue using HQS as previously defined or other HUD-approved inspection methods as their inspection standards until February 1, 2027”.
The short version: with a Housing Choice Voucher, the tenant pays a share of the rent set from their income and the housing authority pays you the rest, up to a cap called the payment standard. In St. Louis the main voucher agency is the St. Louis Housing Authority. I did not find a current two-bedroom payment standard on the pages I read, so ask the housing authority for the figure that applies to the building.
HUD requires housing authorities in this metro to set payment standards from Small Area Fair Market Rents, ZIP code by ZIP code, so the figure depends on the building’s ZIP. For scale, HUD’s FY2027 metro-wide two-bedroom Fair Market Rent for the St. Louis, MO-IL HUD Metro FMR Area, in effect from October 1, 2026, is $1,349 (FY2026: $1,218), and a basic-range payment standard runs from 90% to 110% of the published figure that applies.
The catch: the payment standard is a ceiling, not an offer.
HUD’s rule is that “the PHA may not approve a lease until the PHA determines that the initial rent to owner is a reasonable rent”, judged against rents for similar unassisted units.
The housing authority’s monthly payment is the lower of the payment standard or the gross rent, minus the tenant’s share, and when the rent is above the payment standard, a family moving in cannot take on a share above “40 percent of the family’s adjusted monthly income”.
A rent well above what similar units nearby get can fail even when it sits under the payment standard.
The inspection: before the lease starts, HUD’s rule requires that “The unit has been inspected by the PHA and passes HQS”; HQS are HUD’s Housing Quality Standards. HUD is moving voucher inspections to its newer NSPIRE standard, but under Notice PIH 2026-18 housing authorities “may continue using HQS as previously defined or other HUD-approved inspection methods as their inspection standards until February 1, 2027”.
What Missouri law says about voucher tenants: Missouri has no statewide protection, and since August 28, 2025 state law bars local ones: no county or city “shall enact, maintain, or enforce any ordinance or resolution” that “Prohibits landlords from refusing to lease or rent” a rental property “to a person because the person’s lawful source of income to pay rent includes funding from a federal or other housing assistance program” (RSMo §441.043).
Locally: St. Louis passed a source-of-income ordinance covering Section 8 in 2015, but since August 28, 2025 Missouri law bars cities from maintaining or enforcing such ordinances. Source of income is not a federal protected class: the Fair Housing Act’s rental rule lists “because of race, color, religion, sex, familial status, or national origin”. This summarizes what the laws say; it is not legal advice.
One more 2026 fact: in December 2025 HUD recommended that housing authorities “Stop issuing new vouchers (except HUD-VASH and new FYI vouchers)” to keep 2026 costs inside their funding. Fewer new voucher holders may be searching while that lasts, so ask the housing authority whether it is issuing.
| St. Louis voucher basics | As read September 28, 2026 |
|---|---|
| Main voucher agency | St. Louis Housing Authority |
| Two-bedroom payment standard | Not found on the pages read; ask the housing authority |
| Payment standards set by | ZIP code (HUD requires Small Area FMRs here) |
| HUD FY2027 two-bedroom Fair Market Rent, from October 1, 2026 (St. Louis, MO-IL HUD Metro FMR Area) | $1,349; FY2026: $1,218 |
| Missouri source-of-income law | No; a 2025 state law made local ordinances unenforceable |
| Local rule | St. Louis passed a source-of-income ordinance covering Section 8 in 2015, but since August 28, 2025 Missouri law bars cities from maintaining or enforcing such ordinances |
FHA loan limits in St. Louis (2026)
FHA, the Federal Housing Administration, is the loan program that lets an owner-occupant buy a two-to-four-unit building with 3.5% down. It caps how large a loan it will insure, county by county. St. Louis City and St. Louis County, MO, sit at the national floor for 2026, so the standard limits apply. The cap rises with the number of units, which matters for house hacking: a duplex gets a higher limit than a single-family house.
| Property size | 2026 FHA limit, St. Louis City and St. Louis County |
|---|---|
| 1 unit | $541,287 |
| 2 units (duplex) | $693,050 |
| 3 units | $837,700 |
| 4 units | $1,041,125 |
The FHA limit was one of the seven checks every listing here was screened against. The checks that removed listings in St. Louis were the neighborhood violent-crime ceiling, the abandoned-property ceiling and the gross-yield ceiling; the FHA limit does not appear among them. At these price points, listings fall out on condition, neighborhood or yield long before they approach the two-unit cap.
Source: HUD Mortgagee Letter 2025-23, limits effective for FHA case numbers assigned on or after January 1, 2026. Re-read from hud.gov on September 2, 2026.
What a failed screen does not mean for St. Louis buyers
It does not mean nobody should buy in St. Louis, and it does not mean the city is a bad place to live. The screen asks one narrow question: can a first-time owner-occupant buy a two-to-four-unit building here, with an FHA loan at 6.71% (Freddie Mac PMMS, week of September 3, 2026), live in one unit, rent the others, and carry a payment that fits local incomes with a cost of owning near or below renting, in a neighborhood that passes a safety and abandonment check.
The way around it: a local buyer with cash, a renovation budget, a contractor, or knowledge of a specific block can beat any screen. This one is built for someone who has none of those things yet. Rates, prices and listings all move, and the screen is re-run when the data is refreshed.
What this page does not tell you
- Flood insurance is not modeled anywhere in this analysis. Budget for it separately.
- Condition is screened statistically, not inspected. A cheap building can still be a money pit.
- The rent figure is a market benchmark, not a signed lease. Verify achievable rent on the specific unit.
- An FHA owner-occupant loan requires you to live in one of the units for at least a year.
- Accessory dwelling unit rules for St. Louis are not sourced on this page yet.
Ready to start looking?
If your numbers work and you’re ready to actually shop for a duplex, these are St. Louis-area agents and brokerages whose own websites show real small-multifamily and investor work. I don’t know them personally and I’m not endorsing anyone, so treat it as a starting point for your first few calls, not a ranking. A good fit will be comfortable with two-to-four-unit listings and can point you toward Missouri’s MHDC First Place down-payment assistance for first-time buyers.
Grus Realty Group
4SaleStLouis
Their multi-family page speaks directly to owner-occupants who live in one unit and rent the others.
Invest St. Louis
Independent MO brokerage
Specializes in multi-family, with dedicated 2–4 unit listings and investor-buyer resources.
St. Louis Real Estate Society
Locally owned brokerage
Runs a dedicated “Multi-Family 2–4” listings section and helps buyers spot which St. Louis multi-families actually cash-flow.
Mogul Realty
Brokerage + property management
A brokerage and property manager that guides duplex and multi-family investors from purchase through management.
“Buying a duplex to live in one unit is a great way to enter the market and drastically reduce your cost of living. It is a proven strategy to build equity while having your mortgage significantly offset by rental income. To maximize your returns, I would suggest renting the other unit as a short- or mid-term rental.” — Peter MacKercher, broker, Mogul Realty
Our note: with an FHA loan, the borrower signs a contract not to rent any part of a two-to-four-unit home for less than 30 days (24 CFR 203.16), so on FHA the mid-term version, a lease of 30 days or more, is the one that fits.
STL MultiFamily
Dino Benos · STL Real Estate Center
An entire brokerage built around St. Louis multifamily properties for buyers.
Salient Realty Group
Licensed MO brokerage
St. Louis multifamily specialists who advise buyers on their next two-to-four-unit deal.
Are you one of these agents? Feel free to add VanToVault to your resources page. Your buyers get a free, no-signup rent-vs-own calculator and a St. Louis down-payment-assistance guide, and I’ll keep your listing here current. Want an edit, or to be added? Get in touch.
Run your own numbers for St. Louis
Starts on the median surviving deal in this report. Move any slider to see what changes.
Cash to close is separate: down, before closing costs. Taxes and insurance scale with price at this metro’s modeled rate. The rent allowance is , the figure used for St. Louis throughout this report.
Next step
These are St. Louis averages. The specific building you are looking at will not match them — its price, its rent, its payment and the assistance you qualify for are all particular to it.
The First-Property Bundle is how you run that building: six calculators including the house-hack analyzer, the playbook, and a 15-minute workflow for finding the down payment assistance in your own county.
This page stays free either way.
Keep comparing: first-time buyer programs in Missouri, and the duplex numbers for Kansas City and Louisville.
Where these numbers come from
- Listing prices and counts: active two-to-four-unit listings (Realtor.com, Movoto), screened for price floor, FHA county limit, price per square foot, gross yield, neighborhood violent crime, abandoned-property share and home-value trend.
- Rents: the one-bedroom figure is the average of Zumper and Apartment List metro asking rents (May to July 2026; RentCafe stands in for Zumper in Cleveland and Scranton, and is Buffalo's only series, August 31, 2026); the model scales it per ZIP by HUD FY2026 Small Area Fair Market Rents relative to the metro FMR. The two-bedroom figure is the HUD FY2026 SAFMR median across the ZIPs where surviving listings sit, with Zumper's two-bedroom asking rent as a second reading. Six metros carry a single one-bedroom series (Bakersfield, Buffalo, Rochester, Scranton, Syracuse, Youngstown).
- Local economy: unemployment is the BLS metro rate where one is published and the state rate otherwise; rental vacancy is the Census Housing Vacancy Survey state rate for every metro; median household income is ACS 2024 one-year (B19013); population is the Census Vintage 2025 metro-area estimate.
- Neighborhood safety screen: violent crime by ZIP, CrimeGrade.org, anchored to FBI city-level rates (Table 8, 2019).
- Mortgage rate: 30-year fixed, Freddie Mac Primary Mortgage Market Survey: 6.71% is the rate used throughout this analysis. The rate chart re-runs the same screen at each rate.
- Loan terms and mortgage insurance: FHA 3.5% minimum down payment and MIP schedule, HUD Handbook 4000.1. Income guidelines: FHA 31% / 43% qualifying ratios, same handbook. Area median income and the 80% limit: HUD FY2026 Income Limits (Section 8), huduser.gov.
- Property taxes: county effective property-tax rates. Insurance: state average premiums, scaled to price.
- Down payment assistance: state and local program terms, checked for two-to-four-unit eligibility.
- All of it, as one file: the open data page (CC BY 4.0).
- The St. Louis Housing Authority, landlord page; read September 28, 2026.
- HUD, Designated Small Area Fair Market Rent (SAFMR) Areas (last updated August 2024): "The following 65 metro areas are designated as mandatory SAFMR areas by HUD."
- Code of Federal Regulations, 24 CFR 982.503 (payment standard basic range), 982.505 (the monthly payment), 982.507 (reasonable rent), 982.508 (the 40% limit at move-in) and 982.305 (inspection before the lease); read September 28, 2026.
- HUD, Notice PIH 2026-18 (July 15, 2026), NSPIRE administrative procedures for voucher programs.
- Source-of-income law: Revised Statutes of Missouri §441.043 (as amended by HB 595, effective August 28, 2025); 42 U.S.C. §3604(a); read September 28, 2026.
- NAHRO, HUD Recommends PHAs Cease Issuing New Vouchers (December 23, 2025).
- HUD, FY2026 Fair Market Rents (revised), St. Louis, MO-IL HUD Metro FMR Area (METRO41180M41180); read September 28, 2026. FY2027 figures: HUD, FY2027 Fair Market Rents, St. Louis, MO-IL HUD Metro FMR Area (METRO41180M41180), effective October 1, 2026; read September 29, 2026.
Figures reflect the Foothold model run at the 6.71% model rate (Freddie Mac PMMS, week of September 3, 2026) on listings from June to August 2026, and are estimates for comparison, not an appraisal or a loan quote. Verify the numbers on any specific building before making an offer.
Questions people ask about buying a duplex in St. Louis
How much does a duplex cost in St. Louis?
A duplex in St. Louis costs $315,000 at the entry level (25th percentile) and $365,000 at the median, measured across the 46 two-to-four-unit listings that passed the 2026 Foothold screen out of 343 found. Both are list prices.
What is the average rent in St. Louis in 2026?
Average rent in St. Louis is about $1,048 a month for a one-bedroom, the average of Zumper and Apartment List asking rents for mid-2026, and about $1,180 for a two-bedroom on HUD FY2026 small-area fair market rents, the median across the ZIPs in this report.
Is it cheaper to own a duplex than to rent in St. Louis?
Owning the example deal on this page, a $335,000 two-unit, and renting the other unit costs about $2,418 a month all-in, against about $1,048 to rent comparable space, so renting is about $1,369 a month cheaper before equity.
Can you still buy a duplex in St. Louis with an FHA loan?
A two-to-four-unit building in St. Louis can be bought with an FHA loan at 3.5% down like anywhere else; there were 343 of them listed when this ran. The Foothold screen removed 297 of them on neighborhood, price or yield checks, which is a statement about the listings on the market, not about the loan.
Why is St. Louis not on the Foothold Index?
A metro makes the Foothold Index only if its median surviving deal costs no more than renting plus 10%, and the payment fits inside a 48.5% debt-to-income ceiling. St. Louis had 46 survivors of 343, and the median deal I work through on this page runs $1,369 a month behind renting, far past that 10%.[S1]
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Sources
- [S1] Van to Vault, read 24 September 2026: “A metro is then ranked only if its median surviving deal costs no more than renting plus 10%, and the payment fits inside a 48.5% debt to income ceiling.” vantovault.com.
- [S2] Missouri Housing Development Commission (MHDC), read 24 September 2026: “March 2026 manual ("Revised 3/11/2026"): "A 100% forgivable second loan equal to 4% of the total mortgage amount to help with down payment and closing costs"; FAQ: "How much is the DPA mortgage amount? – The MHDC DPA 2nd mortgage amount is exactly 4% of…” mhdc.com.
- [S3] Van to Vault, read 24 September 2026: “Yield ceiling" / "Gross yield above 25%" / "Usually a repair bill wearing a rent number.” vantovault.com.
- [S4] Van to Vault, read 24 September 2026: “Of the 11 ranked, 8 leave an owner ahead of renting month to month. The other 3 rank on entry price and durability.” vantovault.com.
If you use Google, you can pick Van to Vault as a preferred source. Google can then mark this site as preferred in your Top Stories and, where it shows them, in AI Mode and AI Overviews.
Your numbers
What would a duplex in St. Louis cost you each month?
The calculator opens at this page's entry price, $315,000, with $1,048 rent from the other unit and a 6.71% rate. Put in your own price, rent and down payment to see what moves.
Open the calculator with these numbers Check a specific building in Deal Math