The existing window, which is quite a nice proportion for the room but doesn't let in enough light due to the awning and orientation, and is limiting your options in such a small space. Your replacement window is the wrong proportion. Timber windows should be kept well clear of shower spray as they will be subject to rotting out.

I would lose the window altogether, and in relining the room will allow you more flexibility to make the best use of the limited space. Install an openable Velux skylight to flood the room with light and allow better ventilation and better privacy.

Greenwood Heights Townhouse · More Info

Best of luck

Dr Retro

of Dr Retro House Calls

Your two skylight contractors don't want your job. From your second photo it looks like your roof pitch is fairly low, possibly around 15 degrees, so if you do have a low pitched roof then the shaft is very short. Yes, the closer the roof is to the external wall the shorter the length of the shaft is, but with a low pitched roof it won't make much of a difference. Find another skylight contractor who will give you a splayed shaft that gets wider as it gets closer to the ceiling.

Warren Drive 2 · More Info

Best of luck

Dr Retro

of Dr Retro House Calls

I love that window and also love the skylight, it does sound like the guys didn't want the job, it is a specialist job for some, but a good builder would have no problem installing one. Mind you they are quite expensive. The more affordable way would be to add a simple water proof curtain to match the bathroom, even see through. When not being used could be drawn back into the R/H corner please see the following example

I have also drawn the two possible floor plans for you, the bath under the window allows better floor space cheers

Hi there the idea of a cavity door is great except that they take up more wall depth space to fit them in. Your door sounds lovely and would work beautifully as a Barn Sliding door but would you like that for your bathroom. You could certainly swing the existing door the other way, I thought I had done so Ooops.

Just make sure that if you do a sliding door it slides back beside the toilet not to the other side, I had a friend who was advised by a Prof who did that "other side" and the toilet is constantly exposed terrible mistake and very unhappy. The shower curtain can just be pulled aside when not being used, you could put the track behind a white timber pelmet across the wall.

My new flat has a bathroom with the same layout as the first floorplan from Sirius and the door swing in the middle of the room. I understand the desire to hide the toilet from view, but it just doesn't work, I can't wait till I install a barn type door!

I think the problem is that the toilet has been left out in the separate bath and shower floor plan?.

my suggestion leaves the window intact and has a bath across the room with handheld shower for washing children and feet. there's space for a modest shower stall next to the door and toilet tucked out of sight..the biggest issue is the depth of the handbasin and there are numerous small cabinets designed for use in a powder room but i suggest that a semi recessed handbasin mounted on a wide shelf made out of Ceasarstone or similar with pipes exposed underneath (shiny stainless steel not plastic) an in wall medicine cabinet and consider a shower base with an extra long CURTAIN on a high mounted curved rail to allow more generous feeling when the shower is not being used... the original hinged door is more cost effective, more private and allows for hooks on the door for clothes and extra towels...i would also suggest that, unless the original bath and vanity are beyond saving that rearranging the old fixtures and adding new taps, tiles, fresh paint,towels and light fittings will create a nice new bathroom with space for the toilet much more economically and leave the window in place

Keeping in mind that by not moving the toilet you will save quite a lot of money, you can turn it in the same spot by using flexible connectors though. By keeping and maintaining the paint work on the window and just using a waterproof roller blind should protect your window, the mantel is important to keep as dry as possible. we have a large window next to our bath/shower which we protect and to save cleaning with a blind as I have suggested. cheers

These shower baths were used a lot when my kids were small, you can have glass screens fitted , or a stud wall between the window and wall and use a shower curtain.

https://www.thebluespace.com.au/caroma-mayfair-shower-bath

I'd definitely pursue the skylight idea, it will make a huge difference to the feel of the room. Particularly a skylight over a bath/shower can make the room look really great and is easier to install where the height to the pitched roof is shorter.

The window is very narrow, not sure as it's kind of quirky & charming, otherwise replace with another wider old-style sash window or remove all together and just use the large skylight and good downlights.

1800mm wide is lovely for a bathtub against the back wall, and will make a nice focal point as you walk through the door and change the bathroom from looking like a narrow corridor as it currently tends to. Back wiht some fresh white subway tiles which will feel lovely in your farmhouse and with that lovely traditional door and some simple traditional tap ware/showerhead. I like your built in bath reference, I know feature stand alone baths are popular, but with small children, I'd forever be mopping up awkward spaces around it. You maybe able to reuse your existing bath if it's in good nick.

Then a lovely vanity with recessed mirror cabinet built into the wall for lots of storage. I wouldn't fuss too much wiht the toilet, I'd keep it as is, tucked in the corner.

consider my favourite Solar Skylights which are Solar Powered light fittings that look just like a flat light fitting and adds extra daylight to any space ...installation is DIY and cost about $250 ...check Illume or Arcol brands available at Bunnings and Mitre 10...excellent for adding extra daylight without compromising roof and insulation