Here's what I've found after living in and visiting many tract homes- LR-13x18 FR-12x16 (and that they not be in the middle of the traffic flow pattern aka many tract homes post ww2 till about the late 50's) Kitchen (no eating area) 9x11 DR/Nook or other eating area 10x10 Entry-at least 3'6" wide 4' better Bedrooms (good design would at least provide 2 good bed walls aka no doors or windows in it) MBR-12x13 w/ at least 10 linear feet of closets All other bedrooms-10x10 with at least 5 linear ft of closets all closets 2' deep, Baths-5x8 but 5x9 better if fixtures lined up on one wall and tub/shower at end 7x8 and 8x8 with the tub/shower fully accessible if it's 5 ft long 6x8 if it's a 3' shower (fixtures lined up on 2 opposite walls). If you look and many floor plans the best ones will have all of this. Note that square footage does not have to be a lot-ciculation/flow between rooms helps this.

We also bought our house before babies - but I can now tell you they usually are mainly in the tub yrs1-8 maybe even 10 or 11! We opted to put both a tub (with an electric shower) and a walk-in shower / wet room type arrangement in the main bathroom. Seems like a lot in 1 place but works for us.

So finally decided that the bathroom needed some TLC started stripping walls and preparation but now have no idea what I'm going to do next !. Would love a Zen place to relax after a long day in work... Any ideas would be great

It looks like a bad job to me. I would request them to redo it or deduct the payment to get another person to redo it