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Grout Repair

Grout Repair near you

Grout repair renews the joints between tiles rather than the tiles themselves: raking out grout that has cracked, crumbled, washed out or stained beyond cleaning, packing fresh grout into joints cut to a consistent depth, and replacing the flexible sealant where tile meets a tub, a shower base, a countertop or a change of plane. It is the most commonly requested tile service in American homes and the one most often sold as a cosmetic job when it is really a moisture job.

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The distinction that matters is between grout that is dirty and grout that is failing. Dirty grout is a cleaning problem. Grout that crumbles under a key, that has worn into low spots and pinholes, or that keeps cracking along the same line is either worn out or reporting movement beneath the tile, and regrouting over movement simply schedules the next repair.

There is also a real occupational hazard in this particular job. Grinding old grout out of joints is one of the dustiest things done inside a finished house, and the federal construction standard at 29 CFR 1926.1153 treats respirable crystalline silica seriously enough to cap employee exposure at 50 micrograms per cubic meter as an 8-hour time-weighted average and to restrict how the resulting dust may be cleaned up.

Telling grout that needs repair from grout that just needs cleaning

A few quick checks separate the two, and they are worth doing before booking anyone, because the answers change what you should be asking for.

  • Drag a key along a joint: grout that powders or crumbles has failed structurally and cleaning will not bring it back.
  • Look for low spots, pinholes and washed-out sections, which give water a direct path into the bed beneath the tile.
  • Watch how long joints stay dark after a shower, since grout that holds moisture for hours is soaking it up rather than shedding it.
  • Follow any crack with your eye: one that runs through several joints along a single line is about movement, not about grout.
  • Check whether cracking sits exactly in the inside corners or where tile meets a tub, because those joints should hold flexible sealant, not grout.
  • Tap nearby tiles: hollow or loose ones mean the problem is under the tile and regrouting will not reach it.
  • Note any stain reappearing on a ceiling or wall below, which points to water already past the surface.

Regrouting step by step, and controlling the silica dust it creates

Regrouting starts by removing the old grout to a consistent depth with a grout saw, a carbide scraper or an oscillating tool, working carefully enough not to chip the glazed edges of the tile. Taking off only a surface skin is the classic shortcut and the classic failure, because grout packed into a shallow joint has nothing to bond into and breaks out again within a season. The joints are then vacuumed clean, dampened if the grout manufacturer calls for it, packed with grout worked diagonally across the joints, tooled to an even profile and cleaned of haze before it sets. Cement-based grout then needs to cure before it is wetted or sealed, and the label sets that time, which stretches in a cool room, so plan on using another bathroom for a while.

Grinding cement grout out of joints generates respirable crystalline silica, and the federal construction standard is the reference point for how that should be handled. It applies to occupational exposures in construction work except where exposure stays below 25 micrograms per cubic meter of air as an 8-hour time-weighted average under any foreseeable conditions, sets the action level at that same figure, and requires that no employee be exposed above 50 micrograms per cubic meter as an 8-hour time-weighted average. Where a task is listed in the standard's table, the employer must fully and properly implement the engineering controls, work practices and respiratory protection specified for it, unless exposure is assessed and limited by measurement instead.

  • Expect dust extraction fitted to the grinder or oscillating tool rather than an open blade in a closed bathroom.
  • Expect the room sealed off from the rest of the house, with HVAC returns covered so dust is not carried through the ducts.
  • Expect cleanup by HEPA vacuum or wet methods: the standard does not permit dry sweeping or dry brushing where it would add to exposure, unless those alternatives are not feasible.
  • Expect compressed air not to be used to blow down clothing or surfaces, unless paired with ventilation that captures the dust cloud or no alternative is feasible.
  • Respirators protect the crew and are not a substitute for controlling dust at its source.
  • Say so in advance if anyone in the household has a lung condition, or if infants or older adults will be home during the work.

Mold in grout and shower sealant: a humidity problem wearing a cleaning problem's clothes

Dark speckling along grout lines and sealant beads is the most common complaint in an American bathroom, and scrubbing is only half an answer. Mold grows where moisture sits, so a bathroom that stays damp between showers will regrow whatever is cleaned off. EPA's guidance for homes gives a useful threshold: if the moldy area is less than about 10 square feet, less than roughly a 3 foot by 3 foot patch, in most cases you can handle the job yourself, and it advises scrubbing mold off hard surfaces with detergent and water and drying completely. Larger areas justify bringing in someone who does remediation for a living.

The durable fix is drier air rather than stronger chemicals. EPA notes that increasing ventilation, by running a fan or opening a window, and cleaning more frequently will usually prevent mold from recurring, and for homes generally it advises keeping indoor humidity below 60 percent and ideally between 30 and 50 percent relative humidity. Running the bathroom exhaust fan during the shower and for a stretch afterward does more for grout than any sealer. Mold that has grown into silicone sealant cannot be scrubbed back out, because it is in the material rather than on it; that bead is cut out, the joint dried thoroughly and a new bead laid. And if water is getting behind the tile, EPA's general standard for drying water-damaged areas and items within 24 to 48 hours is effectively impossible to meet inside a wall, which is the argument for opening it up rather than sealing over it.

Movement joints and sealant: the joints that must never be grouted

Grout is rigid and has almost no ability to stretch, so it cracks wherever two surfaces move independently of each other. That describes the inside corners of a shower, the joint where wall tile meets a tub or a shower base, the perimeter of a tiled floor where it meets walls and cabinets, and any point where tile abuts a different material such as a countertop or a window frame. Those joints are designed to take a flexible sealant, usually colour-matched to the grout. A neat crack running up every inside corner of a shower is a reliable sign that someone grouted joints that needed sealant.

Sealant is replaced rather than patched, and the preparation is most of the work. The old bead is cut and scraped out completely, residue is removed, and the joint is dried thoroughly before a new bead is laid and tooled, because fresh sealant applied over old sealant or over mold traps moisture behind it and peels away in sheets. Large tiled floors and heated floors also need movement joints within the tiled field itself, positioned as the installation instructions require, and grouting those solid brings the cracks straight back on the same lines.

Choosing what goes back into the joints

  • Sanded cement grout: the traditional choice for wider joints, easy to work but porous, so it stains and generally benefits from sealing.
  • Unsanded cement grout: for narrow joints and for polished or soft-glazed tiles that sand could scratch, with the same porosity to manage.
  • Polymer-modified cement grout: additives raise strength and cut absorption compared with plain cement grout, though sealing is often still advised.
  • Epoxy grout: highly resistant to staining, water and many chemicals and needs no sealer, but it sets quickly and must be cleaned off the tile face promptly, which makes it a product for experienced hands.
  • Premixed urethane and acrylic grouts: convenient and stain-resistant, with cure times and wet-area limitations that vary by manufacturer and must be read.
  • Changing type: new grout bonds poorly to remnants of the old, so switching from cement to epoxy means raking the joints out fully rather than partially.
  • Penetrating sealer: it slows absorption into cement-based grout but does not waterproof it and does nothing for a crack, and it goes on only after the grout has cured as its label requires.

When regrouting cannot fix the problem: water already behind the tile

Regrouting restores a surface. It cannot repair waterproofing that has already failed behind that surface, and this is where homeowners most often spend money twice. Once water has reached the backer, fresh grout is a lid rather than a repair, and it can conceal rot or mold spreading behind the tile while looking immaculate from the bathroom side.

  • Grout that stays dark for hours after the water is off suggests the joints are feeding something behind them rather than drying out.
  • Tiles that sound hollow or shift under pressure mean the bond has failed, which regrouting does not address.
  • Paint peeling, trim swelling or flooring lifting just outside the shower is water arriving from inside the wall.
  • A musty smell that persists after cleaning usually means growth somewhere you cannot see.
  • A stain on the ceiling below an upstairs bathroom is a leak, and the tile is only one of the suspects; a plumber should rule out the valve, the shower arm and the drain.
  • Showers built over ordinary drywall without a continuous membrane frequently need the wall opened rather than the joints renewed.
  • A careful contractor presses tiles, takes moisture readings or lifts a tile to inspect the substrate before quoting a regrout at all.

Licensing for grout and tile work, and paint disturbed in older homes

Grout repair falls under tile work, and in the states that separate the trades that distinction is explicit. California's Contractors State License Board issues the C-54 Ceramic and Mosaic Tile classification for contractors who prepare surfaces as necessary and install the full range of ceramic, mosaic, quarry, paver, glass mosaic and stone tiles by traditional or innovative methods, while its C-15 Flooring and Floor Covering classification expressly excludes ceramic tile. Washington requires every construction contractor to register with the Department of Labor and Industries, with state law requiring them to be bonded and insured to protect the public, and publishes a verification tool for checking one. There is no national licence for grout or tile work, so your own state's board is the authority.

Paint is the other credential question, and it catches bathroom work more often than people assume, because regrouting a floor perimeter or a tub surround can mean pulling baseboard or trim. In a home built before 1978, disturbing painted surfaces brings the work under EPA's rule requiring anyone paid to do it to be certified, with firms certified for five years and a certified renovator assigned to each job. EPA interprets minor repair and maintenance as work disrupting 6 square feet or less of interior painted surface per room, and counts jobs other than emergency renovations performed in the same room within the same 30 days as a single job, so a bathroom visited repeatedly is assessed as one project rather than several small ones.

What drives a regrouting quote, and how LokalMatch fits in

Regrouting is priced by joint length and access rather than by floor area, which is why a small shower can cost more than a large hallway. The variables that move a quote are how many linear feet of joint are being raked out and how deep, the width of the joints and the fragility of the tile edges, whether the work is overhead on a wall or flat on a floor, the grout specified and whether a colour match is being attempted, how much sealant has to be cut out and replaced, the dust control and containment required in an occupied home, and whether anything found behind the tile changes the scope. A quote that assumes nothing is wrong behind the tile should say so explicitly.

LokalMatch handles the first step of finding someone. You set out the job once, describing the room, roughly how much joint is involved, whether it is a floor, a wall or a shower enclosure, whether tiles are loose or sounding hollow, whether there is any sign of water beyond the tile, and the age of the home. Tile installers and grout specialists working your area receive that request, and the ones who want the work contact you directly. The pros pay for the requests they receive, and homeowners use LokalMatch at no cost. LokalMatch does not regrout anything, does not set prices, and does not vet, rank or recommend any contractor, so checking licensing, insurance, dust control and references stays with you.

Grout Repair: frequently asked questions

Can new grout go straight over old grout?

No, not as a thin skim. Grout needs real depth to bond into, so a surface layer spread over existing grout flakes out quickly and takes the appearance of the joint with it. A proper repair rakes the joints out to a consistent depth first, which is also the dusty part of the job and the reason dust control matters.

How much dust does regrouting make, and should I be concerned?

Grinding grout out is one of the dustiest jobs done inside a finished house, and the dust contains respirable crystalline silica. The federal construction standard requires employers to keep exposures below 50 micrograms per cubic meter as an 8-hour time-weighted average, sets an action level at 25 micrograms, and restricts dry sweeping, dry brushing and compressed-air cleanup where these would add to exposure. Expect tool-mounted extraction, a sealed-off room and HEPA vacuuming.

Why does the mold keep coming back in my shower grout?

Because the moisture is coming back. EPA advises that increasing ventilation, by running a fan or opening a window, and cleaning more frequently will usually prevent mold from recurring, and recommends keeping indoor humidity below 60 percent and ideally between 30 and 50 percent. Run the exhaust fan during and after showers. Mold grown into silicone sealant cannot be scrubbed out and needs the bead cut away and replaced.

Should the corners of my shower be grouted or sealed?

Sealed, with a flexible sealant suited to wet areas. Inside corners and the joint where tile meets a tub or shower base move independently, so rigid grout placed there cracks almost immediately. Grout belongs in the flat joints between tiles. A crack running neatly up every inside corner is the standard sign that grout was used where sealant was needed.

Will regrouting stop my shower leaking?

Only if the waterproofing behind the tile is still intact and the water was getting in through the joints. Grout and tile are not the waterproof layer; the membrane or waterproofed backer is. If tiles sound hollow, trim outside the shower is swelling, or there is a stain on the ceiling below, the wall should be opened and assessed before anyone regrouts, or you will pay for the same repair twice.

Do I need a licensed contractor to regrout?

It depends on your state, since there is no national licence. California licenses tile work separately under the CSLB's C-54 Ceramic and Mosaic Tile classification, and its C-15 flooring classification excludes ceramic tile outright. Washington requires all construction contractors to register with Labor and Industries, bonded and insured. In a pre-1978 home, the separate federal lead certification also applies if trim removal disturbs paint.

Sources

  1. 29 CFR 1926.1153 Respirable crystalline silica (govinfo, Code of Federal Regulations)
  2. EPA: Mold Cleanup in Your Home
  3. EPA: A Brief Guide to Mold, Moisture and Your Home
  4. California Contractors State License Board: C-54 Ceramic and Mosaic Tile Contractor
  5. California Contractors State License Board: C-15 Flooring and Floor Covering Contractor
  6. Washington State Department of Labor and Industries: Contractors
  7. EPA: Lead Renovation, Repair and Painting Program
  8. EPA: How will EPA interpret the term minor repair and maintenance activities?

Written by the LokalMatch editorial team. Last reviewed September 14, 2026. How we write and check our guides

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What affects the cost of grout repair

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Floor area and the number of rooms
  • Type and grade of flooring
  • Removal of the existing floor
  • Subfloor repairs or levelling
  • Stairs, angles and custom cuts
  • Trim, transitions and baseboards

How to compare tile installers before you hire

  • Choose an installer who works regularly with the type of flooring you want, since hardwood, tile, vinyl and carpet each need different skills.
  • Ask them to check the subfloor and moisture levels before giving a final price.
  • Get a written quote that covers removal of the old floor, subfloor prep, underlay, trim and transitions.
  • Ask whether you or the installer will supply the flooring, and who is responsible for ordering extra for waste.
  • Look at recent work in person or in photos, paying attention to seams, edges and transitions.

Questions to ask tile installers before you hire

  • Will you remove and dispose of the old flooring?
  • How will you check and prepare the subfloor?
  • Is my space suitable for this type of flooring, especially in a basement, kitchen or bathroom?
  • Are baseboards, transitions and stair nosings included?
  • Will you move the furniture and appliances, or should I?
  • Does your workmanship warranty cover problems like lifting, gaps or cracked tiles?

Grout repair permits and local rules

Some grout repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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