Thirty-two days.
That is the national average time to lease a single-family rental right now. It sounds like an operational footnote. Run the arithmetic against current single-family rent growth and it turns into the single largest controllable number in your model.
Rents grew 1.3% year over year. One vacancy event costs you roughly six years of what that growth rate produces.
If your pro forma still runs on a 3% escalator, the gap between your spreadsheet and the market is quietly doing a large share of your projected return.
What 32 Vacant Days Actually Cost
Take a $330,000 rental at $2,200 a month. Those are assumptions, not quoted figures, but they are close enough to a median small-investor acquisition to be useful.
- Annual gross rent: $26,400
- One year of rent growth at 1.3%: about $343
- 32 days of vacancy: about $2,315 in lost gross rent
Divide the second number into the third. A single 32-day vacancy costs about 6.7 years of the incremental rent that today's growth rate generates.
Add a turn. Paint, clean, minor repairs and a leasing fee on a property like this plausibly runs $2,000 to $3,000, though turn costs vary enough by market and condition that no honest national figure exists. Call it $2,500 as a planning number and the full event lands near $4,815.
One fair caveat: rent growth compounds and persists, while a vacancy is a one-time hit. The comparison is not perfectly apples to apples. But it frames the priority correctly, because you will have several turns over a hold period and you do not control the growth rate at all.
Single-Family Rent Growth at 1.3%: The Backdrop
Single-family rents rose 1.3% year over year as of May 2026, down from 2.6% the prior year, according to Rentometer's mid-year 2026 report. The same report puts the SFR vacancy rate at 6.1% and average time to lease at about 32 days.
The seasonal picture is not uniformly soft. Rents rose 2.2% between February and May, ahead of the 1.9% gain over the same stretch in 2025. Spring still works. The annual number is what carries your model.
On the asset side, average SFR occupancy sits at 94.0% while cap rates have climbed to 7.3%, per CRE Daily's reporting on Arbor research. Those two facts belong together. Cap rates rose partly because the growth assumption underneath the asset class got smaller. The market already repriced for slower rent growth. Many pro formas have not.
What Low Single-Family Rent Growth Does to a Five-Year Model
Run the same $26,400 rent forward five years under both assumptions.
- At 3% growth: cumulative rent of about $140,161, ending at $29,713 in year five
- At 1.3% growth: cumulative rent of about $135,477, ending at $27,800 in year five
The cash-flow gap is roughly $4,684 over five years. Real, but survivable on its own.
The exit is where it compounds. That year-five rent gap of about $1,913 translates to roughly $1,186 of NOI at a 62% margin. Capitalized at 7.3%, that is about $16,250 of lost exit value on a single door.
Combined, a 3% assumption in a 1.3% market overstates a five-year outcome by roughly $21,000 per property. On ten doors, you have written yourself a $210,000 check that the market did not sign.
Joe's read: A growth assumption is the easiest number in the model to be wrong about, because nothing pushes back until year five. Vacancy tells you it is wrong in about thirty days. Build the model around the number that argues with you.
Why Vacancy Now Outweighs Escalation
For most of the last cycle, rent growth covered operational sloppiness. A slow turn cost you something, and next year's increase papered over it. At 1.3%, the paper is gone.
Three consequences worth internalizing.
The occupancy line moved to the top. A 94% average occupancy means roughly 22 vacant days a year baked into the class average. Every day you beat that average is a day of pure margin.
Renewal economics changed. Pushing a sitting resident for an above-market increase used to be close to free. Now, if a $75 monthly bump triggers a move-out, you spend $4,800 to capture $900. The math argues for retention in a way it did not three years ago.
Acquisition-stage occupancy is worth real money. A property that arrives with a qualified resident and a signed lease skips the lease-up window entirely. That is not a soft benefit. On the numbers above it is worth about $4,800 at closing, before you count the carrying cost of the mortgage during those vacant weeks. We walked through how this compounds across a portfolio in our piece on building a zero-vacancy SFR portfolio.
Your Reunderwriting Checklist
- Drop the escalator to market. Use 1.0% to 1.5% unless you have market-specific evidence for more. If the deal only clears at 3%, the deal does not clear.
- Model vacancy in days, not percentages. A 5% vacancy assumption hides an 18-day turn. Thirty-two days is 8.8%. Use the day count you actually expect.
- Fund a real turn reserve. Put a per-turn dollar figure in the model and an assumed turns-per-hold-period count beside it.
- Set an occupancy floor. Decide the level below which the deal fails, and stress the model against it before you offer.
- Credit occupancy at acquisition. A tenant-in-place property should score better than a vacant one at the same price, explicitly, in the model.
- Recheck the exit cap. If you are underwriting slower rent growth, the buyer behind you will too. We covered how that repricing is showing up in the spread between cap rates and mortgage rates.
The Practical Takeaway
Slow single-family rent growth is not a reason to stop buying. Occupancy is holding at 94%, cap rates have repriced upward, and demand for rental housing has not weakened.
It is a reason to stop letting an escalator assumption carry the return. When rent growth runs at 1.3%, the money is made in the days your property is occupied and the price you paid to get it. Both are things you control.
Rent, turn cost and operating margin figures above are illustrative planning assumptions, not survey data. Cited statistics are sourced and linked. Conditions vary substantially by market.
