The Real Cost of a Vacant Apartment Unit

An empty unit doesn't show up as a bill. There's no invoice for the rent you didn't collect, so vacancy is easy to underestimate. But for most properties it's one of the largest costs on the income statement, and one of the few that marketing and leasing can shrink quickly.

Most owners know roughly what a unit rents for. Far fewer know what each empty day costs, how many of those days their property racks up in a year, or which part of the turn process they come from. Without those numbers, vacancy feels like bad luck rather than something you can manage.

Here's how to calculate the real cost of a vacant apartment unit, per day and per year, and what cutting vacant days is worth to your property's value.

How to calculate the cost of a vacant apartment unit

Start with lost rent, then add the costs that keep running. The formula for lost rent is:

Daily rent = monthly rent x 12 / 365

Vacancy loss for one unit = daily rent x days vacant

Here's what that looks like at common rent levels:

Count days from the day the previous resident moves out to the day the new one moves in. Include the make-ready period. A unit that isn't rent-ready still isn't earning rent.

Don't forget down and model units

Units held offline for long renovations, damage repairs or use as a model or office earn no rent either. They often sit outside the vacancy report because they aren't "available," which hides them from the people who could fix them. List every non-earning unit monthly with the reason and an expected return date. A model unit can be worth keeping, but it should be a decision with a cost attached, not a habit.

The costs that keep running

Lost rent is only part of the cost of vacancy in an apartment. While a unit is empty, you also pay:

• Utilities for the vacant unit, which usually fall to the owner
• The make-ready: paint, cleaning, repairs, flooring and appliances as needed
• Marketing to find the next resident, from listing fees to paid ads
• Leasing staff time for showings, applications and paperwork
• Concessions used to close the next lease, such as a free month
• Fixed costs such as property taxes, insurance and debt service, which don't pause when the unit is empty

Some of these are turnover costs rather than vacancy costs, strictly speaking. But they arrive together with every move-out, so it's useful to see them side by side.

Worked example: one unit, then a whole property

These figures are an example, not a benchmark. Swap in your own.

One unit

A $1,700 unit sits empty for 45 days between residents.

In this example, lost rent is less than half of the total. That's why focusing only on rent understates the real cost of an empty unit.

A 200-unit property

Now scale it. With 50% annual turnover, a 200-unit property has 100 move-outs a year:

• Lost rent: 100 turns x $2,515 = $251,500 a year
• All turn costs combined: 100 turns x $5,595 = $559,500 a year

Seasonality changes the math

The same unit can cost very different amounts depending on when it turns. In many markets, a unit that turns in late spring re-leases quickly, while one that turns in December may sit for weeks longer because fewer renters are moving. If a large share of your leases end in your slowest months, your average vacant days will stay high no matter how good your leasing team is.

The fix is lease expiration management: pricing lease terms so fewer leases end in slow months. It takes a year or two to reshape your expiration mix, but it's one of the most reliable ways to cut vacant days for good.

For context, the national rental vacancy rate was 7.3% in the second quarter of 2026, according to the Census Bureau's Housing Vacancy Survey (opens in a new tab). Whatever your submarket looks like, every property loses rent between residents, and the question is how many days.

What vacancy does to your asset value

Vacancy lowers your net operating income (NOI), and buyers and lenders value apartment buildings by dividing NOI by a cap rate (the market's expected return). At a 5% cap rate, every $1 of annual NOI is worth about $20 of value.

So the cost of vacancy is bigger than the rent you lose this year. Using the 200-unit example:

Cutting 15 days off each turn is worth about $1.68 million in value on this example property, without raising rent.

Vacancy also matters beyond a sale. Lenders size loans and refinances on NOI, so higher vacancy can mean a smaller loan or tighter terms. And because buyers underwrite your trailing 12 months, a property that has kept vacant days low for a full year can show it in the numbers, rather than asking a buyer to take an improvement on faith. Our guide to increasing NOI in multifamily shows how vacancy fits with concessions, retention and effective rent.

Where vacant days go, and how to cut them

Split every vacancy into three parts so you know which one to fix:

1. 1
   Notice to rent-ready: the make-ready. If this regularly runs more than a week or two, look at vendor scheduling, ordering materials before move-out, and walking the unit during the notice period.
2. 2
   Rent-ready to lease signed: marketing and leasing. If units sit ready but unleased, you need more qualified traffic or better conversion.
3. 3
   Lease signed to move-in: scheduling. Long gaps here often come from move-in dates set around the renter's convenience rather than the property's.

The biggest single fix is usually pre-leasing: marketing each unit the day notice is given, so a new resident is signed before the old one leaves. After that come faster follow-up on leads, so ready units don't wait for a reply, and paid demand pointed at your own site when a floor plan is slow. Our lead nurturing and apartment advertising services cover both.

Watch for hidden vacancy

The most expensive vacant days are often the ones nobody sees coming. A unit on notice that isn't listed yet is already on its way to being vacant. Check your exposure (vacant units plus units on notice over the next 60 days) every week, and make sure every unit in it is listed, priced and scheduled for its make-ready. Exposure tells you about next month's vacancy while there's still time to change it.

Track three numbers every week

To keep the cost of a vacant apartment unit visible, review these weekly with your property manager:

• Average days vacant, split into make-ready days and marketing days
• Exposure for the next 60 days
• Units ready but unleased for more than a week

When one of these moves, you'll know which part of the process needs attention before the cost shows up on the T-12.

Should you lower the rent or wait?

Compare the cost of waiting with the cost of a discount. At $1,700, an extra 30 days vacant costs about $1,680. That's the same as a $140 a month discount for a full year. If a unit has been sitting, a modest price adjustment or a one-time concession on that specific unit is often cheaper than holding out. Use a one-time concession rather than a lower base rent where you can, so your next renewal increase starts from the higher number.

What to do next

This week:

1. 1
   Calculate your daily rent value for each floor plan.
2. 2
   Pull last year's move-outs and the days each unit sat vacant.
3. 3
   Split the days into make-ready, marketing and move-in scheduling.
4. 4
   Multiply it out to see your annual vacancy cost, then by 20 for its effect on value at a 5% cap rate.
5. 5
   Run your numbers in the ROI calculator to see what shorter vacancy is worth to your property.

For the full plan to keep units filled, read our playbook on how to increase apartment occupancy, or see how the Growth Engine brings visibility, conversion and positioning together.