Hope Leitner, Realtor®, CRS

Maybe not. Perhaps the sound you hate is coming down your chimney or through attic vents. Or maybe leaks around your windows are letting in noise along with cold air. Everyone who hates noise should consult an acoustical consultant before they throw money at the problem. For about $1,000, consultants will measure the kind and level of the noise you want to keep out, and suggest the best way to block the sound.  All you might need is a $2 tube of caulk around your windows. If you're going to spend $15,000 on windows, why not get some consulting for $1,000. 

You’d think so, but you’d be wrong. There are different kinds of physics going on. Energy-efficient windows primarily depend upon low-E coatings and gas between thermal panes to reduce heat transfer and increase energy efficiency. Sound-blocking windows, on the other hand, primarily use thicker and laminated glass, and large air gaps between panes to deaden sound. You can easily make a soundproof window energy-efficient by adding low-E coatings. But you can’t easily make an energy-efficient window soundproof without changing its glass and construction. It’s a balancing act between the performance attributes you deem important for your project. 

T he sound of silence does not come cheap. An insert for a 3-foot-by-5-foot window, costs roughly $950, including installation, though pricing varies depending on features. Custom 3-foot-by-5-foot windows built to an architect’s specs, typically cost between $7,000 and $8,500 (without installation). You can spend a lot of money if you want to block out ear-splitting but occasional noises such as thunder or ambulance sirens. “Is it worth the extra $25,000 to get another 5% performance?” Clients were asked – most replied, “I’ll accept the siren or thunder.”

To reduce sound, you must create a barrier between the sound and the ear that captures the sound. Homes do that with walls, roofs and windows that block sound waves from entering. To increase a window's ability to block sound and increase its STC rating, the window manufacturer must: Add mass (make glass thicker) Add air space (increase the distance between window panes) Use laminated glass, a glass-plastic-glass sandwich that further reduces noise transmission CitiQuiet windows are inserts installed behind your existing window, which adds up to 4 inches of dead, sound-reducing air between the principal window and the new interior window. The company's 1/2-inch laminated insert has a STC rating of 38 and promises up to a 95% noise reduction depending on the size of the window opening, apartment location, and type of noise.  Zeluck Inc. manufacturers high-end, dual-pane windows that a 1-1/4-inch thick and reach an STC rating of 42.

No residential window blocks all sound, all the time. “Soundproof” is shorthand for noise reduction windows that block up to 90% to 95% of noise coming through windows. Sounds with low frequencies, like garbage trucks grinding trash, are harder to block than sounds with higher frequencies, like birds chirping. So when you shop for sound-reducing windows consider “what frequencies you want to soundproof against,” says John Storyk, an acoustical consultant and a founder of the Walters-Storyk Design Group based in Highland, N.Y. The acoustics industry makes soundproof window shopping easier by rating the sound-stopping quality of windows on a sound transmission class (STC) scale; the higher the number, the more a window inhibits sound. Your basic, single-pane window has an average STC rating of 27; a dual pane window has an average STC rating of 28. Soundproof windows, however, have STC ratings of at least 45, and some climb to the mid-50s, which block as much as 95% of noise.

Is outside noise driving you crazy? Soundproof windows could be the solution — or you might do better with some less-costly alternatives. Sound pollution has joined light pollution as another irritant that drives us bonkers and kills our love of home. But there’s good news: Soundproof windows that’ll put a damper on intrusive noise are going mainstream and are available at home improvement centers. “Things are getting louder, and people are getting more sensitive,” says Rich Galietti, sales manager of CitiQuiet, which has been manufacturing soundproofing window inserts for 25 years (Home Depot recently began selling them). Galietti says soundproof windows are most popular in urban areas beset by idling buses, highway traffic, and police sirens.  “We hear, ‘I love my view, but the highway below is so loud,’” Galietti says. “That’s when we’re called in.” But do soundproof windows deliver the peace and quiet they promise? Or are they another home improvement fad that sounds...