September 2026 Rental Leasing Time: What 34 Days Can Tell You

September 2026 rental leasing time reached 34 days in Apartment List’s national series, even as its vacancy index fell to 7.0%. The figures describe different populations and different time periods. For operators, the listing interval is a benchmark; the full period without rent depends on the property’s turnover calendar.

September’s longer leasing interval

Published September 29, 2026, and labeled the October 2026 report, the release measures September conditions. Leasing time was two days longer than in both August 2026 and September 2025. Vacancy declined from February’s 7.3% peak. These comparisons use the September 29 edition; the report’s web page updates monthly.

What apartment time on market captures

Apartment List’s December 11, 2024 methodology defines time on market as the median interval between the original listing date and lease date for apartments leased during the month. Although the monthly report uses “average” in its narrative, the methodology specifies a median. Still-unleased listings do not yet contribute a completed interval.

The series uses transactions feeding Apartment List’s rent model. That model’s repeat-transaction methodology excludes units with only one observed leasing episode. Its transaction sample should therefore not be assumed identical to the vacancy sample.

The public time-on-market explainer does not specify whether withdrawals and relistings reset the clock or how intervening unlisted days are handled. Do not assume those gaps are consistently captured.

Why vacancy can fall while leasing takes longer

Under the August 2023 vacancy methodology, Apartment List averages daily available-unit shares within each property, then weights properties by unit count. This is a monthly inventory measure.

Its sample requires at least 10 units, a six-month platform history and at least one monthly vacancy reading of 15% or less. New developments in initial lease-up remain excluded until they qualify. The sample favors larger properties and can change over time. Those eligibility rules cannot simply be transferred to the separate leasing-time series.

The distinction between inventory and completed intervals helps explain how the measures can diverge. When older listings finally lease, they can lengthen the reported median while removing apartments from available inventory. For a fixed group of buildings, fewer apartments entering availability can also reduce inventory even if leasing intervals lengthen.

These are possible mechanisms, not findings about what drove September’s results. Renewals could contribute to fewer apartments becoming available, but the two national indicators alone cannot establish that explanation. A falling inventory total does not tell an operator whether the oldest available unit is becoming easier to lease.

Compare the benchmark with your property’s calendar

A national median cannot supply a building’s expected downtime. Apartment List publishes local series at city, county, metro and state levels, subject to coverage requirements. Choose a consistent geography and month when comparing these or other rental data and reports with your own records.

Season also matters. Apartment List describes leasing intervals as generally shorter during summer. Compare the same month across years alongside the latest monthly change.

For a small building, assemble comparable turnovers by bedroom count, condition and season. Record the sample size, typical interval and slowest cases. Keep currently unleased units visible separately; completed leases alone can conceal a growing backlog.

For each turnover, record the dates that explain the rent gap:

• When the previous tenant’s rent obligation ends.
• When repairs and cleaning finish, and when advertising starts.
• When a lease is secured, occupancy begins and new rent starts.

Under the measure’s listing and lease endpoints, make-ready days before the first listing fall outside the interval. Work performed while the listing is active can overlap it. Any gap after the measured lease date but before rent begins requires a separate allowance. These are consequences of the endpoints, not estimates of how often those situations occur.

Use actual calendar dates to remove overlaps. Advertising before the previous tenancy ends can make listing time longer than the period without rent. Delaying advertising until repairs finish can make the rent gap longer than listing time.

Put rental downtime assumptions into cash flow

Consider a hypothetical apartment renting for $1,800 monthly. Assume the previous rent obligation has ended, seven days of preparation occur before listing, and new rent begins five days after leasing. For illustration, those periods do not overlap. Use a simplified $60 daily rent allowance, calculated as $1,800 divided by 30.

The outer cases are sensitivity tests, not published percentiles. In this example, each additional 10 days costs $600 before expenses. The national median does not estimate the average dollar loss across your turnovers.

For an annual budget, multiply the loss per comparable turnover by the expected turnover count, allowing for different rents and timing. If an existing vacancy allowance already includes those losses, reconcile the estimates instead of adding both. Keep cleaning invoices, repairs and leasing fees separate from foregone rent; our guide to separating downtime from other turnover costs explains that distinction.

Review these rental operating assumptions with your property manager or accountant. Choose the base case from the building’s records, then test whether available cash covers the slower case.