Disregard my bad math in the example of physical vacancy in my earlier post.
The correct calculation is:
Example: 12 unit building, 10% turnover, 1 month average turns. A twelve unit has 144 rental months (12 units x 12 months); 10% turnover is 1.2 units per year; 1.2 units turning over annually is 1.2 units x 1 month average turn = 1.2 vacant months; 1.2 vacant months / 144 total rental months = .83%, call it one percent physical vacancy.
I have a physical vacancy calculator (that I should have used earlier!) that calculates both the number of turns given a vacancy rate and the vacancy rate given the number of turns. Here's an example from it (The numbers in blue are entered by the user):
In this example of an 18 unit building, given a 5% vacancy rate and 2 month average turns, the number of turns per year is 5.4. This is shown in the upper section.
In the lower section, using a projected 5 turns per year and 2 month average turn time, the calculated vacancy rate is 4.63%.
If you would like a free copy of the vacancy calculator send a message with 'Vacancy Calculator' in the subject either on here or through the Contact Us page on our website. The response will be faster through the website because we monitor it constantly during the work day.
Knowing the number of annual turns at a property is important because they are so expensive. First the unit is not producing any revenue while it's being turned over but in addition that unit is incurring costs; Management time to handle the departure of the old tenant as well as managing the actual turnover work and handling the onboarding of the new tenant. Then there's the cost of physically preparing the unit to be rerented and the marketing and leasing costs of finding a new tenant. If that work is done with in house employees there is the added cost of payroll burden and processing.
A rule of thumb used on large properties says the average turnover cost is equal to about four or five months of rent on the unit. That assumes there is a dedicated team in place that can turn the unit around in 30 days too.
Breaking out the unit turn costs from the general maintenance and repair expense will allow an owner to see the real impact of unit turns on their bottom line.
Knowing the difference between a property's physical and economic vacancy is very important because most of the difference is from issues that can be improved by management; Getting market rents on lease renewals, making sure concessions are as competitive as possible, reducing credit losses and turnover with better screening, etc.