Glass Block Showers Are Back: How to Do the Trend Right

Glass block showers are genuinely back for 2026, but the version that works looks nothing like the wall-to-wall blocks of the 1990s. The modern take is restrained: a single curved screen, a half-height privacy wall, or a run of blocks pulling light into an internal shower, set against quality tiling. The look is the easy part. The skill, and the thing that decides whether your shower leaks in two years, is the waterproofing interface where the glass block structure meets the tanked, tiled wet area.

Key takeaways

• Glass block has returned as a deliberate feature, used sparingly, not wall to wall.
• The whole wet area, tile and block, must sit inside one continuous tanked envelope.
• The block-to-tile junction is the critical detail and the most common leak point.
• Glass block is heavy, demands a sound base, and is not a corner-cutting shortcut.

A West Wickham wet room built as one continuous waterproof envelope. Any feature that introduces a second system, like glass block, has to tie into that envelope without a break. Wet rooms service

Why glass block is back, and how to keep it tasteful

Glass block earned its bad reputation honestly. In the 1990s it went everywhere, in bulk, and it dated fast. The 2026 revival is the opposite instinct. It uses glass block as a single, considered gesture, valued for what it actually does well: it brings light through without giving up privacy, it softens hard tiled rooms, and it has a warm, slightly retro character that pairs surprisingly well with brass fittings and warm-toned tile.

The rule is restraint. A curved glass block screen instead of a clear glass panel. A half-height privacy wall between the WC and the shower. A short run of blocks borrowing daylight into an internal, windowless shower. Used like that it reads as architectural. Cover a whole wall in it and you are back in the time capsule. The trend lives or dies on how little of it you use.

The part that matters: the waterproofing interface

Here is where I get serious, because this is the bit that goes wrong. A glass block shower is two different systems sharing a wet area: a tiled, tanked surface, and a mortar-built glass block structure. Water does not care about the join between them. Your waterproofing has to.

A wet area is only watertight if the tanking membrane is continuous. Behind every tiled surface you need a proper tanking layer, a product such as a liquid membrane or a sheet system like Schluter Kerdi, taken up the walls and across the base with no gaps. The moment you introduce glass block, you create a junction between that tanked, tiled zone and the block work, and that junction is the single most likely place for water to find its way through. See what is tanking for why this membrane is the part of a wet room you never see and never compromise.

The block-to-tile junctions sit at the corners and the base, where a screen or half-wall meets a tiled wall and the floor. To do them right:

• The tiled side is tanked right up to and behind the meeting line, so the waterproof layer never stops short of the join.
• The base is sealed so water cannot track underneath the blocks and out the other side.
• The joint itself is finished in a flexible, colour-matched sanitary sealant, never rigid grout. Glass and a tiled substrate move at different rates, and a grouted joint there will crack and let water in within a year.

Treat the whole thing as one waterproof envelope that happens to contain two materials, and it works. Treat the block work as a separate, self-sufficient wall and you have built a leak.

Wet room or shower tray?

This decision shapes how the glass block detail is handled. In a full wet room, the entire floor is tanked and falls to a drain, so a glass block screen sits within an already-continuous waterproof floor. With a shower tray, the tanking ties into the tray upstand, and the block-to-tray junction becomes the line you watch. Both work, but they are detailed differently, and the choice affects cost, drainage, and how much building work is involved. Wet room versus shower tray lays out the trade-offs before you commit to either.

The pitfalls, plainly

• Leaks at the junction. Always the block-to-tile interface, always from broken or short-stopped tanking. This is the one that ruins the room.
• Overdoing it. Too many blocks and you have dated the bathroom on day one. Restraint is the whole trend.
• Treating it as a shortcut. Glass block is not a way to skip waterproofing. If anything it adds a junction that needs more care, not less.
• Building off an unsound base. Glass block is heavy. It needs a level, structurally sound base to build from, or it cracks and moves.

None of this is a reason to avoid glass block. It is a reason to have it built by someone who treats the waterproofing as the actual job and the blocks as the finish.

Getting it right in your bathroom

A glass block shower done well is a lovely, warm, light-filled thing, and it is one of the more characterful trends to come back around. But it asks more of the waterproofing than a plain tiled shower, not less, and that is exactly the part you cannot see once it is finished.

I build wet rooms and showers with glass block features across West Wickham, Bromley, Orpington, and the wider area, tanked as one continuous envelope and detailed properly at every junction. If you like the look and want it done so it stays watertight, get in touch and I will give you a properly specified quote that spells out the waterproofing, not just the tiles.

See: wet room versus shower tray | what is tanking | shower tile ideas