How often should tile grout be replaced?

Author: Prof. Pete Swaniawski DDS  |  Last update: Thursday, January 22, 2026

The best time to regrout shower and bathroom tiles is when you see mold, grout color changes, or the grout is old, about 15-20 years. Showers need more frequent regrouting because they're wet. Seeing mold or mildew between tiles means it's time for new grout.

How do I know when my grout needs replacing?

Cracks, staining, and black mold are some of the signs that your old grout may need to be replaced, but with skilled professionals it can often be renewed.

How long should tile grout last?

There are a number of factors that can cause cracks and issues in the grout. But if cared for properly, grout can last for up to twenty years.

Is it OK to put new grout over old grout?

Yes new grout can be installed on old grout. Make sure the old grout is thoroughly cleaned and then wet before installation. I do this all the time. There is absolutely no need to start over and given the quality of the install you have had so far I would say that starting over might introduce more issues.

How do you know when grout is bad?

The presence of small, hard lumps or clumping means the grout may have started to mix with water vapor. Clumps or lumps mean the grout is bad or is going bad. But if the grout is powdery, like a bag of fresh flour, it is probably perfectly fine.

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Is it better to clean grout or regrout?

If your grout lines have become dingy, dirty, or stained, then cleaning them is a better alternative than re-grouting. In this article, we'll help you determine when re-grouting might be needed versus when grout cleaning will do the trick.

What does grout failure look like?

First, one of the telltale signs of grout failure is when your grout has holes, or is cracked and breaking down. When the grout is deteriorating, this can cause your tiles to become loose or come off entirely. Another indication of grout failure is any sign of mold or mildew.

Is it cheaper to regrout or retile?

Do You Regrout or Retile? The average cost of tiling a shower is about $1,800–$5,000. Retiling a shower will be a few hundred dollars more once you factor in $2–$5 per square foot to remove the old tiles. Regrouting shower tiles costs significantly less, with an average price range of $700–$1,500.

Do you have to dig out old grout before regrouting?

Before you decide to regrout, evaluate the state of the existing grout. If it's severely damaged, crumbling, or has mold, it may be necessary to remove it entirely.

Do grout rakes work?

A dedicated grout rake or a Stanley blade is best for removing existing grout. Grout rakes can be both mechanical and electric. Any electric grout rake is usually 240V and has variable speeds. The Rubi Grout Remover helps to remove grout surrounding ceramic and porcelain tiles.

How long can grout sit before wiping?

As mentioned earlier, the specific recommended waiting time for grout to set and dry will vary based on the product and brand you are using. However, a common guideline is to wait approximately 15 to 30 minutes after applying the grout before wiping off the excess.

Does dry grout go bad?

The shelf life of grout once opened is typically 6 months, but this will vary depending on the brand and how it is stored.

How often should you grout your shower?

For high-traffic areas, like the main bathroom, you should consider sealing it every six months, while low-traffic areas like the guest bathroom can be resealed every two years.

Is it expensive to replace grout?

On average, the cost to regrout a shower is between $600 and $2,500 (or $10 to $25 per square foot). Prices hinge on the size of the shower, the type of grout, and how much old grout needs to be removed.

How do I tell if my grout is dirty?

Discolored Grout
  1. In high-traffic areas, grout lines can become stained and discolored from dirt and grime buildup. ...
  2. Especially if you notice that the grout in less-frequented areas of your home—such as underneath area rugs or in closets—is a different color, then your grout needs a deep cleaning.

Can you walk on new grout?

You might be able to walk on it sooner. But it is best to wait at least a day and preferably two before you try to walk on your newly grouted tile floor.

Can I put new grout on top of old grout?

You don't have to remove all of your old grout to apply the new grout. The new grout can be applied right over the top of the existing grout. You will need a grout removal tool, which is a small tool with a sharp blade capable of chipping away the grout.

Is regrouting worth it?

Q: Is regrouting worth it? A: Absolutely! Regrouting can give your space a fresh, updated look while also addressing any potential issues with cracked or deteriorating grout that could lead to moisture buildup or mold.

Can you skim coat over grout?

Do not attempt to apply new grout over the damaged existing grout. Just applying new grout over the existing grout is called skim coating grout and the new grout will not properly adhere to the old grout. Over time the new grout will start flaking and chipping away. There are two ways to effectively remove old grout…

Why is regrouting so expensive?

The average cost to regrout a shower ranges between $900 and $2,500. Key factors that affect the cost include the shower's dimensions, the type of grout used—such as high-quality epoxy grout known for its mould and stain resistance—and the labor involved in removing the old grout.

What is the best grout to regrout?

epoxy grout is a great choice when you are ready to re-grout a tile project. Because epoxy grout is so much stronger than other types of grout (particularly cement grout), you won't even need to remove all of your old grout. You can apply new grout right over the top of the old grout.

How to tell if grout needs replacing?

How Do I Know if I Need Grout Repair?
  1. The Grout is Cracked or Chipped. If there is a chip or a crack in the grout, even just a small amount of damage, it is crucial that a repair is made as soon as possible. ...
  2. The Grout Lines Appear Thin or are Deteriorating. ...
  3. The Grout was Previously Installed Incorrectly.

What is the white stuff in grout lines?

Similar to the white powder left in a drinking glass when a glass of water is left to evaporate, efflorescence is caused by minerals that are soluble in water being dissolved and transported to the surface of the grout as the water evaporates.

What is the best grout for showers?

Epoxy grout: Waterproof, durable, stain- and shrink-resistant. The best grout in shower walls, backsplashes and other surfaces susceptible to moisture or stains. Ideal for use with unglazed and other tiles.

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