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Unlike sanded grout, unsanded grout doesn’t always require sealing. But it’s a good idea to seal it anyway—especially in moist or humid areas (like bathrooms) or high-traffic spots—to protect it from dirt, mold, stains, and damage. On average, hiring a pro to seal grout costs between $150 and $250 for a 160-square-foot space.

New grout applied over old grout typically doesn’t last as long as grout applied to a clean, prepared surface. If you run into problems like your new grout not adhering well to the old grout, you may see your new grout chipping or cracking within just a few months. For the best longevity, it’s recommended to remove old grout before applying new grout.

You should not use caulk as a direct substitute for grout, but it can be used as a temporary solution or supplement for repairing minor cracks. Caulk is more flexible and does not dry as hard as grout. To perform the repair, first use a grout or rotary saw to remove the old, cracked grout. Then, apply a matching caulk into the cracks, smooth it over, and allow it to cure. Always follow the manufacturer's instructions for drying time, which can be up to 48 hours.

For grout on your floors, you can keep it clean by mopping and sweeping regularly, placing floor mats or rugs in high-traffic areas (or areas more prone to spills, like the kitchen), and removing your shoes before coming into the house. For grout on wall tile, make sure you’re cleaning regularly with baking soda, vinegar, lemon juice, or a store-bought cleaner. Consider sealing your grout, too.