When you sneeze in your kitchen, does your next-door neighbor say, “Gesundheit!“—from their living room? If the answer is yes, that’s a sure sign you’re living way too close to the house next door.

But when you’re looking at a home to buy, and no one’s home next door (sneezing or otherwise), it’s hard to tell if you’ll hear your neighbors once you move in. And even if it does feel too close for comfort (like, so close you can borrow sugar from your neighbor through your respective kitchen windows), you might not have a choice when shopping for a house. Many new homes—and plenty of older ones—seem to be built right on top of one another.

“In South Florida, it’s becoming more and more of a relevant issue,” says Baron Christopher Hanson, a real estate agent with Coldwell Banker Realty in Stuart, FL. “Nearly seven out of 10 incoming Florida homebuyers ask me about backyard privacy within the first 30 seconds of our initial conversation.”

So let’s take a look at the requirements for how near houses can be built next to one another. And what you can do if you live a little too close for comfort to your neighbor.

There’s a shortage of construction-ready lots available to build homes. Indeed, lot inventory in all the top markets remains “significantly undersupplied,” according to housing market data tracker Zonda Economics. (The three hardest-hit markets are in Florida: Jacksonville, Tampa, and Miami.)

Economists point to decades-old zoning rules and land-use regulations as the reason there is a shortage.

“Space is tight, and so new homes are being constructed right next to each other,” says Doug Greene, a real estate investor in Philadelphia. “Many homeowners are grateful to get a place in today’s red-hot market. It’s not until they move in that they realize just how packed-in things are on the block.”

Homes that stand cheek by jowl also have a long history. Row houses—a series of homes connected by common sidewalls—originated in Northern European and British cities during the 16th and 17th centuries.

With land at a premium and changes to local zoning laws aimed at easing the nationwide housing crunch, density in residential neighborhoods is rapidly increasing. Sometimes, in large tract home developments, it can feel like the homes were built within arm’s reach of one another.

And here’s why—there is no federal requirement on how far apart houses should be. Minimum setbacks (or the required space between your house and your neighbor’s house) vary from city to city and even from neighborhood to neighborhood.

“In most cases, the town will have a specific side setback requirement that states the minimum amount of feet the building must be from the lot line,” says Bill Samuel, a real estate investor and general contractor in Elmhurst, IL.

The most common setbacks are often 30 feet in front, 5 feet on each side, and 15 feet in the back.

If you’re curious, check with your local building department. It can provide you with all the zoning rules relevant to your potential neighborhood.

Watch: Is 3D Printing the Future of Home Building?

There are several ways to get an accurate understanding of how much noise you’ll be able to hear from your neighbors.

“Reviewing the homeowners association, condo, or co-op’s house rules as they relate to noise standards is a good place to start,” Michael Shapot, a real estate agent with New York’s Keller Williams. “And, of course, observe noise levels at the home at different times of day before committing to purchasing.”

So take your time and determine how much noise you are comfortable living with—or next to.

“Don’t be afraid to be picky,” says Stephen Keighery, CEO and founder of Home Buyer Louisiana, based in New Orleans. “Buying a home is a huge commitment, and minor inconveniences like a neighbor’s noise can significantly impact your living experience.”

If you found a home you love—despite being able to reach out and touch your neighbors—there are a few things you can do to ensure peace and quiet in your own outdoor space.

“Another thing I recommend is to simply invite your neighbors over to your place and build a good relationship with them,” says Marina Vaamonde, a real estate agent in Houston. “The better you get along with each other, the more you’ll respect each other’s wishes.”

Translation: When they get noisy, you’ll have an easier time telling them to please quiet down.

Meera Pal is a Northern California-based writer with a background in journalism and books. She covers tech, real estate, and everything in between.