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While regular upkeep can increase your carpet's lifespan, most manufacturers estimate you'll need a full replacement after about 10 years. Here are a few ways to know your carpet is reaching the end.

Stains won't come out. Whether it's from spilled wine or a new puppy, there are some stubborn stains that even professional cleaning can't get rid of. If they're minor, you can typically hide them with area rugs or furniture. But if the damage is permanent and unsightly, it's probably time to look for new carpeting. Homeowners typically pay between $760 and $2,540 to replace a carpet, according to the Angie's List Pricing Guide. Per square foot, carpet materials usually cost an average of $2 to $7.

Foul odors won't go away. If you notice that deep cleans just aren't banishing the bad smells, that likely means the issue isn't in your carpet alone — it could be in the padding or floor beneath the carpet. If your pet is the root cause of the issue, you'll likely need a full replacement. If you notice a musty smell, that could mean you have a water or mold problem.

There's visible damage. If there's just a small area where the carpet is frayed, it's possible for a flooring pro to help you patch it up. If your entire carpet was flooded with dirty water, or clean water flooding has taken a long time to dry out, replacement is the best course of action. A pro can also let you know if the damage extends to the floor beneath your carpet.

You have increased allergy symptoms. It can be difficult to remove dust, pet dander and pollen that embed in carpet fibers over time. If you or your loved ones notice more sneezing, itchy eyes or coughing, it may be that the problem is beneath your feet. The Mayo Clinic recommends using a vacuum with a high-efficiency particulate air (HEPA) filter. It costs about $180 for carpet cleaning, via the Angie's List Pricing Guide, and it's worth a try before replacing the carpet.

The carpet is old. If you notice matting, fading color or that the padding just doesn't feel like it's there anymore, it's probably time to move on. If you see ripples or wrinkles, it is possible to have your carpet re-stretched. This is a more expensive repair, so discuss with a carpet pro whether it makes sense.