What country?

You could have a massive mirror on one wall with built in sink and cupboards underneath it or have a reasonable size mirror and cupboards with a sink underneath and two tall cupboards either side of the mirror which can make the room look small will ad you a picture in the morning of what I mean! Hope this helps x

Don't mix your tiles colours....It will feel bigger if you stick to just one colour. To be fair the window is enormous for the room so you already have something to break up the tiles! If you want the room to look more polished like a hotel bathroom I would have dark grout and add brushed steel trims. Have the trims on all the window corners and then add trim at picture rail height and another at skirting board height. Make sure the grout lines match on the floor and walls. If you are having a floating toilet and vanity make sure your towel rail pipes come out of the wall not the floor. In my opinion underfloor heating is well worth the minor cost. A slatted blind may trick your eye into thinking the room is bigger although I might investigate if your local glass merchant can fit a mirror behind the vanity- this could be fitted with the same fittings that would hold a glass balcony secured top and bottom of the window recess and you could have a simple roller blind behind it.

Hi Michael, Sorry, but I have to partially disagree with you on this, daylight colour temperature is 6500K not 4000K. Yes, 4000K is warmer than 6500K but it does not give a truer representation of colour. Colour representation is measured using the colour rendering index or CRI. The closer to 100, the closer to daylight. The Megaman LEDs are 80 CRI for each of the colour temperatures. That said, the 4000K fitting will produce a brighter and cleaner feel to the room. However, it can look too harsh at night. 2700K is closer to traditional halogen fittings. It can look duller during the day, but looks a lot more welcoming in the evening - perfect for a soak in the bath. It comes down to personal preference in the end