No one living room is going to please every interior designer, but there are some pieces that are bigger offenders than others. Interior designers are privy to many different trends and decorating decisions and simply cannot get behind certain looks, no matter how hard they try.

Wondering what types of designs give pros the ick? Keep reading to learn about six in particular, described in detail below.

Matching Furniture Sets

For Taylor Fusco, the founder of Tay Fusco Design, matching furniture sets in living rooms (or really, in any room of the home!) are a major no-no.

“Nothing is worse,” she says.

Instead, the designer urges people to combine a cohesive mix of pieces from a variety of retailers within their living space. Doing so may take longer, but at the end of the day, this practice will help create a more authentic and curated look, Fusco says.

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Bulky Entertainment Centers

No design experts you to forgo a television in the living room. However, you certainly can do without a bulky entertainment unit, Fusco notes.

These days, the designer is all for mounting a sleek TV to the wall and placing a nice console below it. Don’t forget to style the top of your console or credenza with a few books or trinkets to add some flair to this portion of the room.

Furniture That Isn’t to Scale

It doesn’t matter whether your living room furniture is too large or too small—if it isn’t to scale, it will simply look off, which is a major pet peeve of Madelaine Mayer, the founder of AD:ROIT.

Mayer explains that too many small furniture pieces in a living room can create a cluttered look, while oversized items can cause a room to look uncomfortable. Getting the scale just right will pay off in the end.

“The key is balance, using a combination of smaller and low-profile pieces with larger, taller, and more impactful ones while maintaining harmonious proportions between adjacent elements,” the designer says.

One specific issue Mayer often notices with regard to furniture scale pertains to media consoles that are too small. She recommends purchasing a piece that is 10 to 12 inches wider than the television on either side in order to create a balanced look.

Rugs That Are Too Small

Scale comes into play yet again when it comes time to select a rug. Mayer dislikes seeing living room rugs that are not sizable enough for the space and notes that an 8 by 10 foot rug is best for most spaces, while larger rooms or those with big sofas or sectionals will merit a 9 by 12 foot rug.

“If the front legs aren’t on the rug, the furniture doesn’t feel grounded and the rug itself tends to feel like an island in a sea of flooring,” she says.

Indoor/Outdoor Rugs

As you shop for living room rugs, aim to steer clear of those that are suitable for indoor and outdoor spaces alike, Laura Bebber, the founder of Lark Design, urges.

“With a few exceptions, they tend to look like a piece of paper lying on the living room floor,” she says.

Instead, look for something a bit more plush and welcoming to really bring your living room to life, the designer suggests. Since a rug has the potential to add a layer of warmth and coziness, Bebber explains you want to opt for that kind of look instead of a stale one.