A bathroom in Newton, Massachusetts.

It started with a tub nobody used sitting in front of the best window in the room, and a divider wall that closed off the laundry corner. Two moves fixed both: the tub became a walk-in shower, and the wall came out.

Along the way the floor tile, toilet, lighting and exhaust fan were replaced too — not because anything was upsold, but because each one had its own reason.

In this video:

• The four layers under a walk-in shower (pan liner, sloped mud bed, cement board, full waterproofing) — the part that disappears under the tile

• Why a niche has to be positioned before the first tile goes on

• A low curb you can step over without lifting your knee

Materials used: white subway tile laid horizontally, hex mosaic shower floor, marble-look large-format floor tile, patterned mosaic niche, matte black hardware, white drawer vanity with integrated sink.

The house did not get any bigger. It just works now.

Sun Shore Construction — licensed and insured, serving Greater Boston.

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