How to Regrout Tile Floor (Complete Step-by-Step Guide)

Regrouting a tile floor is one of the most impactful DIY projects you can do — it transforms a tired, stained, or crumbling floor back to looking fresh and new without replacing a single tile. It takes patience, but the process is straightforward and the results are dramatic.

This guide covers everything you need to know to regrout a tile floor from start to finish.

When Should You Regrout a Tile Floor?

• Grout is cracking, crumbling, or falling out in sections
• Grout is deeply stained and won't clean up
• Grout has mold that keeps returning despite treatment
• Grout is more than 15–20 years old and showing significant wear
• You want to change the grout color for a fresh look

What You'll Need

• Grout Removal Tool — to remove all old grout
• Pre-Mixed Tile Grout — for refilling all joints
• Grout Float — for applying grout evenly
• Vacuum and damp sponge
• Bucket of clean water
• Grout sealer (for after the repair)
• Safety glasses and knee pads

How to Regrout a Tile Floor: Step-by-Step

Step 1: Remove all old grout.
This is the most time-consuming part. Use a grout removal tool to rake out all the old grout from every joint. For large floors, an oscillating multi-tool with a grout blade will save significant time. Remove grout to a depth of at least 2–3mm — enough for the new grout to bond properly.

Step 2: Vacuum and clean.
Vacuum all dust and debris from the open joints. Wipe the tile surface and joints with a barely damp cloth. Allow to dry completely before proceeding.

Step 3: Inspect tiles and adhesive.
With the grout removed, press on each tile to check for hollow spots or movement. Re-bond any loose tiles with adhesive and allow to cure before grouting.

Step 4: Apply grout.
Open your pre-mixed tile grout and load the grout float. Hold the float at a 45-degree angle and spread grout diagonally across the joints, pressing firmly to pack the grout fully into each joint. Work in manageable sections of about 3–4 square feet at a time.

Step 5: Remove excess grout.
After filling a section, use the edge of the grout float held nearly perpendicular to the floor to scrape off excess grout from the tile surface. Work diagonally to avoid dragging grout out of the joints.

Step 6: Sponge clean the tiles.
Using a damp (not wet) sponge, wipe the tile surface in circular motions to remove grout residue. Rinse the sponge frequently in clean water. Don't press too hard — you don't want to pull grout out of the joints. Repeat until the tile surface is clean.

Step 7: Allow initial cure.
Let the grout set for 15–30 minutes, then do a final light sponge wipe to remove any remaining haze. Allow 24–48 hours before foot traffic.

Step 8: Remove grout haze.
Once the grout has cured (24–48 hours), buff away any remaining grout haze from the tile surface with a dry cloth or cheesecloth.

Step 9: Seal the grout.
After the grout has fully cured (typically 72 hours), apply a grout sealer to protect it from moisture, staining, and future deterioration.

Tips for a Professional-Looking Result

• Work in small sections so the grout doesn't dry before you can clean it
• Keep your sponge damp, not wet — too much water weakens the grout
• Change your rinse water frequently — dirty water leaves a film on tiles
• Work diagonally across joints when applying and removing excess grout
• Don't rush the cure time — walking on grout too early causes cracking

Frequently Asked Questions

Do I have to remove all the old grout before regrouting?
Yes — applying new grout over old grout doesn't bond properly and will fail quickly. All old grout must be removed to a depth of at least 2–3mm.

How long does regrouting a floor take?
For an average bathroom floor, expect 4–6 hours of work spread over two days — one day for grout removal and cleaning, one day for applying new grout. Add another day for curing before use.

Can I change the grout color when I regrout?
Yes — regrouting is the perfect opportunity to change grout color. Just make sure you remove all the old grout so the new color is consistent throughout.

How often should you regrout a tile floor?
With proper sealing and maintenance, grout can last 15–20 years. In high-traffic or wet areas, inspect annually and plan to regrout when you see widespread cracking, crumbling, or staining that won't clean up.