Why do my tiles sound hollow?

Hollow sound means there is a void between the tile and the setting bed, usually from incomplete mortar coverage. The tile may hold for years, or it may crack under load. It is worth monitoring and worth raising if it is widespread.

Can a single cracked tile be replaced without redoing the floor?

Often yes, if you have matching tile and the substrate underneath is sound. The repaired tile may be slightly visible because grout and surrounding tile age. If several tiles are cracked in a line or the same area keeps failing, the movement causing it needs to be addressed first, otherwise the replacement cracks too.

Should I keep spare tile after an installation?

Yes. Ask your installer to leave the leftover tile from the same production run, since colors and sizes shift between runs and discontinued lines are hard to match later. Store a box somewhere dry and label it with the room. That single box is what makes a future repair invisible instead of obvious.

What does it cost to have a tile repair done?

Pricing varies by market and by how difficult access and matching are, and most pros have a minimum charge that makes a single tile feel expensive per unit. If you have several small repairs around the house, group them into one visit. Ask whether the quote includes matching grout and any subfloor correction found underneath.

How-To Guides

Cracked and loose floor tiles

Why tiles crack, lift or sound hollow, when replacing a single tile is enough, and when the problem is the floor underneath rather than the tile.

By Elijah Canfield, Founder, Hire Best Pros · Updated August 26, 2026

Elijah Canfield is the founder of Hire Best Pros. He writes and edits the site's consumer guides, with a focus on how home service and moving projects are priced, scoped and compared.

An installer laying hardwood planks across a living room floor

A single cracked tile from a dropped object is a simple replacement. Tiles that crack in a line, lift at edges, sound hollow when tapped or pop up on their own are telling you about the assembly underneath: subfloor movement, missing expansion joints, poor mortar coverage or moisture. Fixing the tile without fixing the cause means doing it again.

Key points

Cracks that follow a straight line across several tiles usually mean movement below.
Hollow sound means the tile is not fully bonded.
Keep spare tiles from the original installation. Matching later is difficult.

What the pattern tells you

Reading tile failures
What you see	Usual cause
One cracked tile, impact point visible	Dropped object. Replacement only
Cracks in a line across several tiles	Subfloor movement, deflection or a crack in the slab below
Tiles lifting or tenting along a run	Missing or filled expansion joints, no room for movement
Hollow sound when tapped	Poor mortar coverage during installation
Loose tiles in a wet area	Moisture reaching the setting bed or a failed waterproofing detail

Replacing a single tile

Replacing one tile is a realistic homeowner job when you have a matching spare. It involves removing the grout around it, breaking the tile out from the center without damaging neighbors, cleaning the old mortar back to a flat bed, setting the new tile at the same height and matching the grout.

Wear eye protection, and be aware that matching grout color on an aged floor is often the visible part of the repair.

When it needs a professional

Cracks that reappear in the same place after repair
Several tiles loose or hollow across an area
Tenting or lifting, which means the field is under compression
Any tile failure in a shower or wet area, where waterproofing may be involved
A bouncy or deflecting floor, which is a structural question before it is a tile question

Tiles failing across an area?

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Common questions

Why do my tiles sound hollow?: Hollow sound means there is a void between the tile and the setting bed, usually from incomplete mortar coverage. The tile may hold for years, or it may crack under load. It is worth monitoring and worth raising if it is widespread.
Can a single cracked tile be replaced without redoing the floor?: Often yes, if you have matching tile and the substrate underneath is sound. The repaired tile may be slightly visible because grout and surrounding tile age. If several tiles are cracked in a line or the same area keeps failing, the movement causing it needs to be addressed first, otherwise the replacement cracks too.
Should I keep spare tile after an installation?: Yes. Ask your installer to leave the leftover tile from the same production run, since colors and sizes shift between runs and discontinued lines are hard to match later. Store a box somewhere dry and label it with the room. That single box is what makes a future repair invisible instead of obvious.
What does it cost to have a tile repair done?: Pricing varies by market and by how difficult access and matching are, and most pros have a minimum charge that makes a single tile feel expensive per unit. If you have several small repairs around the house, group them into one visit. Ask whether the quote includes matching grout and any subfloor correction found underneath.