New build - bathroom door opening

i dont really see the problem with that WC, especially for a 2 bed house (presuming there is an accessible WC downstairs too)

If that door swung out it could knock someone backways down the stairs. making a bigger bathroom would take space from the bedroom. Most people want the space in the bedroom rather than the bathroom. Widening the bathroom would mean the door to the bedroom would hit the bed sop the bed would have to be moved. The designer did the best they could with the space available. Don't move into the house if you don't like it.

a two-bed house doesnt really need 3 WCs most likely

assuming the bath itself doesnt actually span the full length of the bathroom wall, some of the space at bottom (as we look at it) side of bath could be used for pocket door cavity, & this wouldnt interfere with any utilities/light switches on other side of wall in hall.

The door would look a bit odd as it would be recessed from the wall a bit as you look from the hall, but would avoid OPs swinging door issue.

Still OP, even with a sliding door you would not have good space for a litter tray, it would be in the way of the sink toilet or bath depending on where you put it, regardless of door.

If someone is coming up the stairs and reaching the landing just as the dorr opens they could be knocked backways. The person opening the bathroom door may not be aware of them and neither will they know someone is about to leave the bathroom. Your house insurance may not cover you if you alter the door like that. Someone could end up in a wheelchair.

It might not be difficult to do, but it would create a dangerous situation.

A door opening out might pass regulation of its swing does not encroach on minimum landing area.

Given the layout of the stairs and toilet in this thread, I feel a door opening out could very well create a shock situation when someone just approaching the top of the stairs has a door opened out quickly into their face and could result in a missed step and fall.

I certainly wouldn't design a house with a door opening out so close to stairs.

Look at the diagram above. Anyone coming up that stairs has to step as they alight on the landing. If someone arrives on the landing as the door is swinging outwards they will be struck by the door and knocked back towards the stairs.

Would you install a shower instead of the bath? I'm getting rid of my bath if I ever get enough money together to do up my house.

Front doors open inwards so they're easier to break down by fire brigade.

The hinges are on the inside so burglars cant pop the hinge pins.

A visitor doesn't have to step backwards to be let into your house.

They don't catch in the strong wind.

Small children and animals can't push the door to open it.

Many more reasons.

Ah right I see... people become alert as soon as they reach the bottom of the stairs.

OP, absolutely no offence meant by my question, however is this the first time you've looked at a set of plans, not just of this house but of any one? I ask because I can guarantee you have been stepping into bathrooms in houses all yer life and thought nothing of it. The door swing is shown there so it all looks tight but you open the door, step through and close it after you, it's no big deal.

Had the same issue in a dormer bungalow with small landing so installed a sliding door on a barn door track. Works great. Can be expensive but we installed it ourselves.

Also in another house disabled bathroom there was a sliding door for extra space so a wheelchair could turn.