How to Regrout Bathroom Tile Yourself and Make It Look New

Here's a truth most homeowners don't realize: that dated, grimy-looking bathroom tile you've been wanting to rip out might not need replacing at all. In most cases, the tile itself is perfectly fine — it's the grout between the tiles that's making everything look old, dirty, and neglected.

Regrouting is one of the highest-impact, lowest-cost bathroom upgrades you can do. For about $30–$50 in materials and a weekend of work, you can make a 20-year-old tile installation look like it went in last month. I've regrouted three bathrooms in my own home, and the before-and-after difference genuinely shocked me every single time.

This guide walks you through the entire process — from deciding whether regrouting is the right call, to removing old grout, applying new grout, and sealing it so it stays looking fresh for years.

When Regrouting Is the Right Move (And When It's Not)

Before you commit to this project, take a few minutes to assess your tile and grout condition. Regrouting makes sense in several common situations, but it's not always the answer.

Signs You Should Regrout

• Discolored grout that won't come clean. If you've tried grout cleaners, baking soda paste, and even a steam cleaner without results, the discoloration has likely penetrated too deep. New grout is the fix.
• Cracked or crumbling grout lines. Small cracks let water behind the tile, which leads to mold, loosened tiles, and eventually structural damage. Don't ignore this one.
• Missing grout in spots. If chunks of grout have fallen out entirely, water is already getting where it shouldn't be.
• Grout that's visibly moldy below the surface. Surface mold you can clean. If you see dark spots deep within the grout itself, replacement is the only real solution.

When You Might Need More Than Regrouting

If tiles are loose, cracked, or tenting up from the substrate, regrouting alone won't solve the problem. Loose tiles usually mean the thinset adhesive underneath has failed or there's water damage to the backer board. In that case, you're looking at a partial or full retiling job.

Also, if your shower walls feel spongy or soft when you press on them, stop — that's a sign of serious water damage behind the tile that needs professional assessment before any cosmetic work.

Tools and Materials You'll Need

One of the best things about regrouting is the short, affordable supply list. Here's what to gather before you start.

Essential Tools

• Oscillating multi-tool with a grout removal blade — This is the single most important tool for this job. A carbide-grit grout removal blade fits most oscillating tools and makes the hardest part of the job manageable. Budget about $10–$15 for the blade if you already own the tool.
• Grout float — A rubber-faced float for pressing new grout into the joints. Around $8–$12 at any hardware store.
• Grout sponge — These are denser and hold more water than regular sponges. You'll want at least two. About $5 for a two-pack.
• Bucket — For mixing grout and rinsing your sponge.
• Spray bottle — For misting tile before grouting.
• Utility knife — For detail work in tight corners.
• Safety glasses and a dust mask (N95) — Old grout creates a surprising amount of fine dust. Don't skip these.
• Knee pads — If you're working on a floor. Your knees will thank you after hour two.

Materials

• Sanded grout — For grout lines wider than 1/8 inch, which covers most bathroom floor tile and many wall applications. A 10-lb bag costs $12–$18 and covers roughly 60–80 square feet depending on tile size and joint width.
• Unsanded grout — For grout lines 1/8 inch or narrower, commonly found with marble, glass tile, or tightly-set ceramic. Same price range.
• Grout sealer — Applied after the grout cures. A quality penetrating sealer runs $10–$15 and is absolutely essential for keeping your new grout looking good. Don't skip this step.
• Painter's tape — For protecting fixtures, tub edges, and any surfaces you don't want grout dust or residue on.

Pro tip on grout color: This is your chance to change the entire look of your tile. White grout shows dirt fastest. A light gray or warm beige stays cleaner-looking much longer and still provides attractive contrast with most tile colors. Take a tile sample to the store and hold it against grout color swatches before committing.

Step 1: Remove the Old Grout

This is the most labor-intensive part of the project, but it's also the most important. Rushing the removal or leaving too much old grout in the joints is the number-one reason DIY regrout jobs fail.

How to Remove Grout Efficiently

1. Tape off fixtures and edges. Cover your drain, any exposed caulk lines you want to protect, and nearby fixtures with painter's tape.

2. Start with the oscillating tool. Set it to a medium speed and hold the grout blade at a slight angle into the grout joint. Let the tool do the work — pressing too hard can chip tile edges. Work in 12–18 inch sections.

3. Remove grout to at least half the depth of the tile. This is critical. You need to go deep enough for the new grout to form a strong bond. For 1/4-inch-thick tile, you should remove at least 1/8 inch of grout depth. For thicker tile, go deeper.

4. Use a utility knife for corners and tight spots. The oscillating tool can't reach everywhere. Score along the grout line with a sharp blade and pick out loose material.

5. Vacuum as you go. A shop vac makes this much easier. Old grout dust packs back into the joints if you let it accumulate, which makes your new grout bond poorly.

Common Mistakes During Removal

• Not going deep enough. Skimming off just the surface means your new grout has nothing to grip. It'll crack and crumble within months.
• Chipping tile edges. Move slowly and keep the blade centered in the joint. If you do chip a tile edge, don't panic — the new grout will cover minor chips.
• Forgetting to remove grout from inside corners. Corners where tile meets tile (not where tile meets a tub or fixture) need regrouting too.

For a typical 40-square-foot bathroom floor, expect removal to take 3–5 hours. A full shower surround adds another 2–4 hours. Yes, it's tedious. Put on a podcast and take breaks every 45 minutes to rest your hands.

Step 2: Prep, Mix, and Apply the New Grout

Once all the old grout is removed and the joints are vacuumed clean, you're ready for the satisfying part.

Preparing the Surface

1. Wipe down all tile surfaces with a damp cloth to remove remaining dust.
2. Lightly mist the joints with water from your spray bottle. Damp joints help the new grout bond properly. You want them damp, not dripping wet — standing water in the joints will weaken the grout.
3. Make sure the room is between 50°F and 90°F. Extreme temperatures cause grout to cure too fast or too slowly, both of which lead to problems.

Mixing the Grout

Follow the manufacturer's instructions on the bag, but here are the universal principles:

• Add powder to water, not water to powder. This prevents lumps.
• Mix to the consistency of thick peanut butter. It should hold its shape when you scoop it but still spread easily.
• Let it slake (rest) for 5–10 minutes after mixing, then stir briefly again. This step lets the polymers in the grout activate fully.
• Only mix what you can use in 30 minutes. Once grout starts to set, adding water to re-soften it weakens the final product. Work in small batches.

Applying the Grout

1. Scoop grout onto your float and spread it diagonally across the tile, pressing firmly into the joints. Working diagonally prevents the float edge from digging grout out of the joints.

2. Make multiple passes at different angles over each section to fully pack the joints. You should see grout completely filling every joint with no gaps or air pockets.

3. Scrape excess grout off the tile surface using the edge of the float held at a steep 70–80 degree angle. Work diagonally again.

4. Work in 4–6 square foot sections. This gives you time to apply, pack, and clean each area before the grout starts to haze over.

The Critical Cleanup Window

About 15–20 minutes after applying each section, the grout will start to firm up in the joints but will still be slightly hazy on the tile surface. This is your cleanup window.

1. Wring out your sponge until it's just barely damp. A too-wet sponge pulls grout out of the joints. This is the most common beginner mistake.
2. Wipe diagonally across the tile in smooth, even strokes. Rinse and wring the sponge after every single pass.
3. Make two or three passes maximum. Over-wiping erodes the grout joints.
4. Let remaining haze dry and buff it off with a dry microfiber cloth after 2–3 hours.

Step 3: Caulk the Transition Lines

Here's something many DIYers miss: any joint where tile meets a different surface — the tub, the shower pan, a countertop, the floor-to-wall corner — should be caulked, not grouted.

These are called "change of plane" joints, and they experience movement as your house settles and materials expand and contract with temperature changes. Grout is rigid and will crack in these spots. Silicone or latex caulk flexes with the movement.

How to Caulk Like a Pro

• Use a color-matched caulk that's close to your grout color. Most major grout brands sell matching caulk.
• Apply painter's tape on both sides of the joint for a perfectly straight line.
• Cut your caulk tube tip at a 45-degree angle, making the opening slightly smaller than the joint width.
• Apply steady pressure and move at a consistent speed.
• Smooth the bead immediately with a wet finger or a caulk finishing tool.
• Remove the tape while the caulk is still wet for the cleanest edge.

Step 4: Seal the Grout (Don't Skip This)

After the grout has fully cured — most manufacturers recommend waiting a full 72 hours, though some newer formulas cure in 24–48 hours — you need to seal it. Unsealed grout is porous and will start absorbing moisture, soap residue, and stains almost immediately.

How to Apply Grout Sealer

1. Make sure the grout is completely dry. If you can't wait 72 hours, at minimum wait until the grout is uniform in color with no darker damp spots.
2. Apply sealer with a small foam brush or applicator bottle directly to the grout lines. Keep it off the tile surface as much as possible, especially with natural stone.
3. Let it penetrate for 5–10 minutes, then wipe excess off the tile with a clean cloth.
4. Apply a second coat after the first has dried (usually 1–2 hours).
5. Reseal annually for shower areas and every 2–3 years for bathroom floors. Mark it on your calendar.

A penetrating sealer absorbs into the grout and repels water from within. Topical sealers sit on the surface and can peel or wear off. For bathrooms, penetrating sealers are the better choice.

Maintenance Tips to Keep Your New Grout Looking Fresh

You just spent a weekend making your bathroom look new again. Here's how to keep it that way.

• Squeegee shower walls after every use. This 30-second habit prevents 90% of grout staining and mold growth. Hang a squeegee in the shower and make it part of your routine.
• Ventilate properly. Run your bathroom exhaust fan for at least 15–20 minutes after every shower. Humidity is grout's worst enemy.
• Clean grout monthly with a pH-neutral bathroom cleaner or a simple mix of warm water and a few drops of dish soap. Avoid bleach-based cleaners for regular use — they break down grout sealer over time.
• Address mold spots immediately. A paste of baking soda and hydrogen peroxide left on the spot for 10 minutes handles most surface mold before it penetrates deeper.
• Don't use abrasive scrub pads on grout. They scratch the sealer. A stiff nylon brush is all you need.

Your Weekend Project Recap

Let's put the full project in perspective:

• Cost: $30–$50 for a typical bathroom
• Time: One full weekend (Saturday for removal, Sunday for grouting and cleanup)
• Difficulty: Beginner-friendly, but physically demanding
• Impact: Massive — regrouting consistently ranks as one of the highest-ROI bathroom updates you can do yourself

Compare that to a professional regrouting service, which typically runs $500–$1,200 for a full bathroom depending on your area, and the savings are clear.

The key to success is patience during the removal phase and restraint during the cleanup phase. Take your time removing old grout, and resist the urge to over-wipe when cleaning. Follow those two principles, and you'll end up with grout lines that look professionally done.

Your bathroom tile isn't past its prime — it just needs fresh grout to prove it.