The niche sits within the stud cavity of the wall framing. It is custom in the sense that it was designed to a size and was framed accordingly.
Thank you for the question,
Michael

This pebble tile is from Walker Zanger called Zen Grdn Maluku tan item #2ZGAMTA12 and it comes in 12 x 12 netted tiles. Other companies have similar pebble tiles including Porcelanosa.
Thanks for your question,
Michael

Thank you

Many make grab bars.This one was specified as CR Laurence 18" brushed nickel GB18. Brushed nickel is a nicer finish than stainless steel and matched the rest of the plumbing fixtures.
Make sure the material and fasteners will not rust.
Behind the escutcheon plates (the round parts at the wall itself) are plates that allow for attachement into the wall. It is critical that the wall framing behind the grab bar has blocking if it is wood framed or metal blocking/backing if it is metal studs to ensure that there is adequate strength to support someone using the grab bar.
Thanks for the question.
Michael

Same as the larger format wall tile cut to align with the wall tile and with a border of the pebbles seen in the back of the tiled niche. Thanks for the question. Michael Tauber

Do you happen to have a picture of the floor and walls? I am trying to copy your wonderful design. Thank you, Linda.

We have chosen 12 x 24 tiles for the walls

The plumbing fixtures are all in the Dornbracht- Tara series. Finish is platinum matte. The handles are Dornbracht X-tool. This the european type of separate volume and temperature control with a separate valve to allow for the water to come out of the handheld or the shower head.
Thank you for the question.
Michael Tauber

I think for safety's sake, they SHOULD be.

Yes they were tempered and they were installed by the tile subcontractor supplied by the glass door/enclosure subcontractor. This designed required the coordination of the tile setter as the glass is held back form the face of the wall tile. Thanks for the question,
Michael Tauber

The niche is 12" wide x 5'-6" tall. Thank you for the question.
Michael

The glass shelves were installed by cutting tile on sides of niche to allow for the glass to slide in and then holding it back from face of wall tile the depth of the wall tile.
Thanks for the question, Michael

Floor tile was ann sacks linen 12 x 12 - 5/8" mosaic. Mosaic tiles work better for accomodating slope where there are drains - Also it made a tile between the back wall mosaic tiles and the floor - visually.

That looks like a honed travertine. There are a few different colors available. Ann Sacks and Materials Marketing both have something similar.

Thanks a lot

You are right! It is tile from Ann Sacks - Linen - Mosaic 5/8" and 12 x 12 tiles.
Thanks for asking, Michael, The architect! Pebbles by walker zanger in niche - zen garden maluku.
Best

Thanks it looks beautiful

From this picture it is hard to say the length. You can see the large tiles on the left and right are probably 12"x12" tiles.. so it's at least 3' to 4' deep.

The back shower wall you can eyeball how big a 12"x12" tile would fit, approx. 4 across. So I would say by this picture it is 4'-4'6" wide.

Length: approx 3' to 4'
Width: 4' to 4'6"

The answer is 3' x 5' was a former bathtub location. Thank you for the question - Michael Tauber the architect of the project.
Best,
Michael

That looks like Hansgrohe to me

I think it might be Dornbracht.

Dornbracht tara - Thanks for asking, michael the architect of the project

Work like this is always custom and that height would vary between 18" and 20" above the floor, depending on who's using the seat. There aren't any rules other than what works for whoever's going to use the shower seat.