Why Regrout Instead of Retile?

Grout is porous and takes a beating in the bathroom — from moisture, soap scum, mold, and everyday wear. Over time it cracks, discolors, and crumbles. But if your tiles themselves are in good shape, you don't need to replace them. Regrouting gives your bathroom a fresh, clean look for a fraction of the cost of a full retile — and it's a job most homeowners can do themselves in a weekend.

What You'll Need

  • Grout saw or oscillating tool with grout-removal blade
  • Vacuum and stiff brush
  • Premixed or powder grout (matched to your tile spacing and application — sanded for joints over 1/8", unsanded for smaller joints)
  • Rubber grout float
  • Bucket and sponge
  • Grout sealer
  • Painter's tape
  • Safety glasses and dust mask

Step 1: Remove the Old Grout

This is the most labor-intensive part. Use a grout saw (manual) or an oscillating multi-tool with a grout blade (much faster) to carefully remove the old grout from the joints. Your goal is to remove at least half the depth of the grout joint — ideally all of it — without chipping the tile edges.

Tips:

  • Work slowly along each joint — rushing causes tile chips
  • Keep the blade centered in the joint at all times
  • Use a vacuum frequently to remove dust so you can see what you're doing

Step 2: Clean the Joints Thoroughly

Once the old grout is out, vacuum up all loose debris, then wipe the joints with a damp cloth. Any remaining dust or residue will prevent the new grout from bonding properly. Let the joints dry completely before moving to the next step.

Step 3: Mix and Apply the New Grout

If using powder grout, mix it to a peanut butter-like consistency — thick enough to hold its shape but spreadable. Premixed grout can be used straight from the container.

  1. Scoop some grout onto the tile surface using your rubber float
  2. Hold the float at a 45-degree angle and press the grout firmly into the joints with diagonal strokes
  3. Work in small sections (roughly 3–4 square feet at a time) so the grout doesn't dry before you can clean it
  4. Pack each joint fully — no air gaps or low spots

Step 4: Clean the Tile Surface

Wait 15–20 minutes after applying grout (check the product directions), then begin cleaning the haze off the tile surface:

  1. Wring out a sponge so it's damp, not dripping wet
  2. Wipe in a circular motion to remove grout from the tile face without pulling it out of the joints
  3. Rinse the sponge frequently in clean water
  4. After the initial cleaning, let the tile dry, then buff away any remaining haze with a dry cloth

Step 5: Let It Cure, Then Seal

Allow the grout to cure for the time specified on the package — typically 24–72 hours. Keep the area dry during this period. Once fully cured, apply a grout sealer to protect against moisture and staining. Use a small applicator brush or roller designed for grout lines, wipe away any excess sealer from tile surfaces, and allow to dry.

Common Mistakes to Avoid

  • Using too much water when cleaning: Excess water weakens the grout before it cures
  • Not removing enough old grout: New grout won't bond properly over old grout
  • Working in too large an area at once: Grout dries fast — work in small sections
  • Skipping the sealer: Unsealed grout absorbs moisture and stains quickly

How Long Does It Last?

When properly applied and sealed, fresh grout can last 10–15 years or more. Plan to reseal every 1–2 years in high-moisture areas like showers to maintain its protective properties.

Is This Right for You?

If you're comfortable with basic tools and can commit a full weekend, regrouting is one of the most satisfying DIY bathroom projects available. The results are immediately visible and the cost savings versus hiring a professional are significant. Give it a try — your bathroom will thank you.