Do you have a floor plan?

And here is the design with the addition that we are wondering if we can do without.

Sorry the second post should have included this design.

The first one is certainly the most efficient layout for the space you have. The bedroom is a little small for a king size bed but it can work. What size is your current bedroom? Is 13x11 bigger than what you have right now? If so, then you should not worry too much about the size of the new bedroom.

I like the first one much better. It is true that you get a bigger bedroom but since you mentioned that you would prefer to avoid the extra expense of an extension, I find your first layout gives you more for the money spend.

If you were to go with the extension, I would use the bathroom layout you showed in the first floor plan.

The first posted layout is nicer, but the extra cost must factored in. Do you have any idea how much extra it would cost over the second plan you posted?

And can post more of the layout so we can see the rooms outs the master?

Are you committed to the separate toilet room? They make a space more cramped and don't really serve much of a purpose.

Personally, I don't like the view of a toilet so a wall to conceal it is nice but it feels more spacious if you don't put a door. If you have just an opening there will be more light come in the bathroom.

We are not committed to the toilet room. We would rather not have it.

Here is the full second floor plan with the extension. Note that there is also a third floor with two bedrooms.