There comes a time when everyone wants a little more space — whether it is because a child is on the way, a home office has become a necessity or for some other reason. But moving into a larger home can be costly and difficult, especially in New York City.

StreetEasy recently looked at how hard it would be for renters in each borough to move into an apartment with an additional bedroom, using information on asking rents and the availability of listings drawn from its site during a 12-month period beginning in November 2016.