How to Frame and Tile a Bathroom Mirror

Mirrors in builder-grade bathrooms are often simple sheets of glass glued directly to the drywall, lacking the character and polish of a framed piece. By installing a custom tile frame, you create a sophisticated focal point that elevates the entire room without the heavy cost and effort of replacing the mirror itself. A job done well results in a perfectly level, flush frame that hides the raw, sharp edges of the mirror glass while providing a seamless transition to the wall. You aren't just covering an edge; you are finishing a piece of furniture-grade decor that can withstand the high-humidity environment of a bathroom.

  1. Prime the Surface Clean. Measure the width and height of the existing mirror to determine your frame dimensions. Clean the perimeter of the mirror glass thoroughly with rubbing alcohol to remove any soap scum, dust, or hairspray residue so the adhesive will bond properly.
  2. Square Up Your Frame. Cut 1x2 or 1x3 pine boards to form a frame that sits on the perimeter of the mirror and extends slightly beyond the glass onto the wall. Use wood glue and finish nails to assemble the joints, ensuring the frame is square.
  3. Protect Wood From Moisture. Apply a high-quality oil-based primer to the wooden frame to prevent moisture from warping the wood over time. Once dry, lightly sand and apply a coat of moisture-resistant paint to the areas that won't be covered by tile.
  4. Bond Frame to Glass. Apply a heavy-duty construction adhesive specifically rated for mirror or glass applications to the back of your wood frame. Press the frame firmly onto the perimeter of the mirror, using painter's tape to hold it in place while the adhesive cures.
  5. Set Tiles Straight. Apply thin-set mortar or high-strength tile adhesive to the face of the wood frame. Carefully place your chosen tiles onto the frame, using spacers to maintain even grout lines.
  6. Seal the Whole Frame. Once the adhesive is set, apply sanded or unsanded grout depending on your tile gap width. Wipe away excess grout with a damp sponge before it dries completely, and apply a final bead of silicone caulk where the tile meets the mirror glass.