At June 2026, the $1,488 Zillow Observed Rent Index for five-digit label 37421 is the current rental snapshot. That label is both a Zillow ZIP market identifier and a Census ZCTA match; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. The supplied Redfin median sold price is $374,415. Annualizing ZIP ZORI and dividing it by that sale-price median produces a 4.77% cross-source screening ratio. It places a monthly asking-rent index beside a for-sale median, not a unit-level operating result. The immediate tension is directional: resale price rose 1.50% year over year while ZORI gained 1.25%. ZORI is a typical observed asking-rent index blended across rental types, not a lease-transaction series or a measured rent for an individual dwelling.
Redfin’s direct rolling-three-month ZIP resale observation describes the for-sale market, not rental transactions. It recorded 222 homes sold and a median marketing time of 42 days. There were 557 active listings, up 16.18% from a year earlier, while inventory stood at 347 homes, up 21.00%. Months of supply measured 4.7. Sale-to-list signals were also below a uniformly competitive reading: the average sale-to-list ratio was 98.30%, 18.07% of sales closed above list, and 25.93% went off market within two weeks. The combination of a higher resale-price median with more listed supply challenges any simplistic interpretation of the positive rent reading as evidence of a uniformly tightening housing market. These are resale-liquidity signals only and do not provide rental comparables.
The rent history points to steady but cooler growth than the more distant path. Exact same-month annualized ZORI change was 1.25% over one year, 1.21% over three years, and 3.86% over five years. The latest direction therefore broadly confirms the recent three-year pattern, yet it breaks from the faster pace embedded in the five-year record. Coverage reached 99.02% of available monthly history. Monthly rent changes translate to 2.89% annualized variability, so one current index reading carries some month-to-month noise rather than precision equivalent to a fixed contract rent. The largest observed peak-to-trough decline was 2.46%, a separate indication that past ZORI movement was not uninterrupted. Transparent national discovery ranks among history-eligible ZIPs were 1,886 for momentum, 1,416 for stability, and 1,902 for the balanced measure, where lower rank is higher. These are backward-looking measurements, not forecasts or investment recommendations.
Source definitions explain why the rent benchmarks should not be merged. In the matched Census ZCTA, ACS 2024 five-year median gross rent was $1,405. ACS is a five-year survey of occupied renter homes and includes selected utilities, whereas ZORI is an asking-rent index. The supplied local current fiscal-year HUD FMR/SAFMR two-bedroom standard is $1,830; HUD FMR/SAFMR is an administrative, bedroom-specific standard rather than asking rent. For wider asking-rent context, the Chattanooga city scope is $1,504.99, the Hamilton County scope is $1,528, and the Chattanooga, TN-GA metro scope is $1,519. Those city, county, and metro figures are context only, not replacements for the direct ZIP rental observation.
The bedroom ladder is a modelling exercise, not a bedroom-rent survey. It scales the ZIP ZORI using the supplied local HUD ladder to produce modelled monthly estimates of $1,293 for a studio, $1,350 for one bedroom, $1,488 for two bedrooms, $1,854 for three bedrooms, and $1,984 for four bedrooms. Because the shape comes from HUD standards while the base comes from Zillow ZORI, these figures are modelled estimates rather than measured bedroom rents. They help keep bedroom comparisons internally consistent across the supplied sources, but they cannot establish the advertised price, condition, utilities, lease terms, or availability of a particular unit.
Income and burden data provide a separate affordability screen. The matched ZCTA’s median household income is $82,517. Applying the arithmetic 30% screen to current ZORI produces required annual income of $59,520 and an asking-rent-to-income screen of 21.64%. This is arithmetic, not advice or an applicant qualification rule, and area-wide median household income is not a renter-specific income distribution. ACS estimates that 3,639 of 8,875 renter households had gross-rent burdens at or above thirty percent, equal to 41.00%. That burden statistic is useful evidence of survey-reported household pressure, but it does not prove affordability, payment history, or burden for a particular household or dwelling.
Housing stock supplies another boundary on interpretation. The ZCTA contained 24,063 housing units, with 22,278 occupied and 1,785 vacant, for a 7.42% vacancy rate. Renter occupancy represented 39.84% of occupied homes. The vacancy count encompasses units classified for rent, for sale, and seasonal use, so it should not be read as a count of currently rentable units at ZORI or at the modelled bedroom estimates. Likewise, the stock total includes different structure types and ownership arrangements. These ACS figures describe aggregate housing conditions in the statistical area rather than a live inventory feed for an individual address.
The evidence supports a source-labeled snapshot rather than a property-level conclusion. A property-level interpretation would require checks of the current advertised rent, exact bedroom count, utility charges, lease length, concessions, availability date, building type, interior condition, and precise address. A purchase-context comparison would also require sale-date, condition, and list-history checks that the ZIP median cannot supply. The observed tension remains important: rent growth has stayed positive and relatively stable in the recent history, while resale prices also increased but inventory expanded. Neither pattern establishes causation, future direction, or economics for a particular property. The separate Zillow, ACS, HUD, and Redfin universes should remain separate when reading that tension.
","findings":[{"body":"Current ZORI and the direct ZIP resale median both increased year over year, but they describe different markets. The annualized rent-to-price figure is only a cross-source screening ratio because it combines Zillow asking-rent data with Redfin sale-price data. Higher resale inventory alongside a higher sale-price median adds a meaningful counterweight to a simple tight-market interpretation.","title":"Rent and resale are directionally positive but not interchangeable"},{"body":"The one-year and three-year same-month annualized ZORI changes are nearly aligned, while the five-year pace is materially faster. That pattern identifies recent stabilization relative to the longer historical path. High coverage supports the historical read, but the observed variability and drawdown mean the current index remains a time-specific snapshot rather than a fixed rent guarantee.","title":"Recent rent growth matches the medium-term pace"},{"body":"ACS median gross rent reflects occupied renter homes and selected utilities, HUD FMR/SAFMR is an administrative bedroom standard, and ZORI tracks a blended typical asking-rent index. The bedroom figures are modelled by scaling ZORI with the local HUD ladder. Their usefulness is comparative consistency, not evidence of measured rents by bedroom count.","title":"ACS, HUD, and ZORI answer different rent questions"},{"body":"The ZCTA has a measurable vacancy rate and a substantial renter share, but vacancy categories include more than rental vacancies. ACS burden data are similarly aggregate household estimates. Neither measure identifies a currently available apartment, the rent on that unit, the utility structure, or whether a specific household would face rent burden.","title":"Aggregate availability does not identify an available unit"}],"risks":["ZORI blends rental types into a typical asking-rent index, so it cannot establish the contract rent, concessions, utility treatment, condition, or availability for a particular apartment or house.","ACS estimates apply to the matched ZCTA statistical area over a five-year survey period and include selected utilities in gross rent. They are not current listing data and do not match USPS delivery geography exactly.","The bedroom ladder is modelled from ZIP ZORI and HUD standards, while the 30% income screen is arithmetic. Neither establishes a measured bedroom rent, tenant qualification outcome, or household-specific affordability result.","Redfin is a rolling three-month ZIP resale observation. Its price, inventory, marketing-time, and sale-to-list measures do not describe rental transactions, and the cross-source screening ratio cannot establish property-level economics."],"qa":[{"a":"The label is used as Zillow’s ZIP market identifier and is matched to a Census ZCTA for ACS data. A ZCTA is a Census statistical area designed for tabulation; it is not identical to a USPS delivery ZIP. Zillow and ACS therefore remain related but source-distinct geographic evidence universes.","q":"What geography does 37421 represent in this report?"},{"a":"The measures are built differently. Zillow ZORI is a typical observed asking-rent index blended across rental types, while ACS median gross rent is a five-year survey measure for occupied renter homes and includes selected utilities. The difference does not prove that a currently advertised unit is mispriced or that either source is incorrect.","q":"Why is ACS median gross rent lower than Zillow ZORI?"},{"a":"No. They are modelled monthly estimates created by scaling the ZIP-level ZORI with the supplied local HUD bedroom ladder. HUD FMR/SAFMR is an administrative bedroom-specific standard rather than asking rent. The modelled figures provide a consistent relative ladder but do not replace actual bedroom-specific rental listings or signed leases.","q":"Are the bedroom estimates observed rents for studios through four-bedroom homes?"},{"a":"Redfin provides direct ZIP for-sale evidence, including sold-price, inventory, marketing-time, and sale-to-list signals. Zillow provides an asking-rent index. Dividing annualized ZORI by the median sold price creates only a cross-source screen. It does not convert resale observations into rental transactions or identify economics for any particular property.","q":"How should the resale data be related to the rental data?"}],"sources":[{"key":"apartment_list_time_on_market","name":"Apartment List Time on Market — listing liquidity","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/category/data-rent-estimates"},{"key":"apartment_list_vacancy","name":"Apartment List Vacancy Index — rental vacancy","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/apartment-list-vacancy-index-methodology"},{"key":"census_zcta_facts","name":"Census ACS five-year — ZCTA housing and income","release":"ACS 2024 5-year ZCTA","pulledAt":"2026-08-08","url":"https://api.census.gov/data/2024/acs/acs5.html"},{"key":"hud_zip","name":"HUD USPS crosswalk and Small Area FMRs — ZIP rent fallback","release":"ZIP-CBSA 2025Q4 + SAFMR 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