I don't think there is a standard height. Your installer ought to have asked how high you wanted the cabinet. Mine did. Mine is 131cm above floor level, so I don't think yours is too high (assuming it's below eye level).

Because the bathroom will be a shared bathroom with anyone coming over to our house too, I'm just concerned about the height of the mirror for adults who are 5 feet tall. Children using a stool seems normal. But I'm not sure my shorter older relatives or shorter adults in general, would like the need to use a stool lol. Or am I over-worrying 😅

Could you place another mirror somewhere close such as on the landing?

I love your tiles. The builder probably just assumed adults would be around 5.6., especially if he’s tall himself, but should have asked. As it’s all constructed now I would be reluctant to change it, as Daisy says, maybe an extra mirror nearby? The tiles are really great, where are they from?

Thank you. I copied the tiles combination from Topps tiles 😬 zellica forest green and Gatzby.

https://www.toppstiles.co.uk/bathroom-tiles/zellica-tiles

https://www.toppstiles.co.uk/bathroom-tiles/gatzby

Hi there, yes, a bit of an issue. Was a height specified on a design somewhere, or has the fitter arbitrarily decided on the height? We would normally leave this as an "on site" decision for the fitter to consult the client and agree a height prior to creating/modifying boxing & structure to suit. That should have happened quite early in the build in the case of recessed cabinets.

As Sarah correctly indicates, there is no "standard" height and normally there is quite a bit of flexibility, unless you have runs of furniture which include tall units which may set an "upper edge" limit. You don't have this, so now you have a dilemma.

While there is no absolute way to determine a "correct" height, as a rough rule of thumb we would get the tallest & shortest adult using the bathroom and measure "floor to eye" height of both, then pick the midpoint between these two heights as the rough centreline for the mirror, then tweak to taste. My gut says yours is slightly higher than optimal, especially given room height.

As to what to do - reworking it now is a not insignificant undertaking, as you would need to remove a couple of rows of tiles (to one tile each side of the opening), recut the board, possibly add in some additional noggins, possibly tweak the electrics (if it has been left with insufficient float), then recut and retile the "awkward" bit. Any fitter is going to strenuously resist doing that at this late stage! If he is accurate to drawing, then it would be reasonable for them to expect you to pay for the privilege of such a change.

If the design shows the mirror lower, you have a case to tell them to put it right. But expect resistance!

If there is no design and you have not been clear that you wish to be involved in setting the height, then you're into a grey "he says, she says" situation, and have to decide how far you want to try and push it.

Best of luck!

if you really feel it’s too high for the cabinet but it’s too much work to fix
you could consider fitting shelves in the recess instead for some open storage (you could use nice boxes to hide some things) and a small freestanding mirror on the lowest shelf, something like attached would look good.
maybe the wiring could be used for some under shelf strip lighting

Thank you @Caldicot Kitchen & Bathroom Centre. We definitely didn't specify it, thinking it would just be a standard height. And once the case was built, we were asked by the fitter if it looked okay. Well, both my husband and I are quite tall, I'm 5'8" and he's 6'2". So, we looked at it casually, and thought it looked fine. Little did we know to think about someone at 5 feet tall. 😅 So we definitely feel like we were out of depth, but also feeling like shouldn't the fitter know. But good to know that the fitter might have optimised it for the two of us. At this point, we just want the build to continue on. But the fighter inside me just want the builder to also see from our perspective, that we expect them to guide us... This is definitely lesson learnt. And builder is now checking things with us more diligently, and we thinking about our choices more diligently too. 😬

@Euni O, ah well, lesson learned! For the main users it will be fine - a small secondary mirror if absolutely necessary for shorter folk! It is one reason why we normally encourage folk to set a mirror an inch or two lower - even very tall people can normally use most installed mirrors comfortably, but for shorter folk it is more challenging! With a sister at 5 feet, I recognise the challenge...

Most folk only do a new bathroom or kitchen a couple of times in their whole lives, so it is only to be expected that you won't always pick up on the fine detail. You'll remember for the next one you do...

My next question would be the colour of the silicone for the back of the sink that's up against the tiles. The tiles shop recommended black silicone, which I'm not too sure about. I thought brilliant white to match the sink, instead of match the green tiles and black grout? Or clear silicone?

Any advice would be greatly appreciated. 🙏

The tiles look almost black in the pics, so I'm assuming it is a very dark green! Personally I wouldn't choose black with anything other than a black tile, So would probably opt for white. Clear could work, but with the ripple in the tiles, steps in & out for grout, it may almost look like there are holes & gaps in clear silicone. A competent fitter should be able to do a nice, tight small tidy bead.

One last bit advice - use a good BATHROOM grade silicone to avoid risks of mildew discolouration.