Do you have the funds to totally relocate the master bathroom?

Contact a local architect.

we looked into it and moving plumbing was extremely expensive.

I think we need more info as to how eliminating a bedroom is a good idea. BTW when do a to scale drawing it is best done on graph paper so much easier to read for us. Contractors are not designers so get one or better yet an architect and check with realtor if resale is going to be in your future. I can’t see how you will get a bigger bathroom without moving plumbing since the only way to make the bathroom bigger where it is would be to lose space in the master then you would have a long skinny bedroom with a bunch of wasted space since IMO this house really can’t support a huge bathroom. I would redo the existing bathroom and extend it into the coat closet, with all new fixtures and lighting, put in a Pax wardrobe system in the bedroom and be done.

Make sure you have windows facing south, and light coming from at least two directions in the bedroom; eastern light in a bedroom means blackout shades if you’re a late sleeper. I’d prefer closets to be next to another bedroom to give more privacy. But don’t do this without a pro designer/architect involved.

I think @Jillian White is out buying graph paper...

Keep playing with drawing til something makes sense. I tried to sketch something out, let's see if I can attach it. Did you want to add a tub, or just a bigger shower? If windows can be added to the left wall, it would really add more possibilities! I made the bigger closet skinny so the window light still comes in. This loses the hall closets so it may need more work. I am not a big fan of the hall between the closets, it was my attempt to keep the window. Either of the closets where the master was could be removed to be a sitting area or a desk area. Obviously I am not a professional. I just like looking at and thinking about floor plans. I am sure others will jump in to improve my sketch by criticizing it lol. I left the toilet and one sink in place. I think the shower could use the same drain and it would not be too bad to extend the pipes to make it bigger, and add the second sink. The entry point is a bit crowded but I was having trouble adding a second sink if I made the bathroom door by the closets.

@lafdr you shouldn’t have a pocket door next to a shower. The wall would have to be pretty thick to not flex and cause cracks in the grout, I believe.

Ok, then barn door but some people hate those. Also ok to not have a door to the bathroom, our last house didn't.

This is how designers/architects add huge value to projects. By making sure you're doing the right thing. As has been pointed out, a lot of information is missing to get much useful help from the volunteers on this forum. And while we're managing expectations, although some contractors have great visualization skills, it is not realistic to be looking for drawings from your contractor (to scale or otherwise). That is not the role of a contractor unless it is a design/build firm.

Good luck with your project.

Think about if you really need a huge master, and what you would do with the space. Our amazing dream house has a very, very small master bath. But as we've lived in the house for a few years, we realize that we really never needed a lot more space. We go in, shower or do our business, take up the same space at the sink and get out of there!

Is the wall(s) you plan to knock down bearing walls? Do they contain electrical, HVAC, or plumbing?

I'm with the crowd in wanting more information:

- What do you plan to do with a bigger master? 13x13 is not small, even with a king bed. Do you want to add a sitting area or a workout area?

- You want a bigger bathroom -- I get that -- but what do you want to add? A tub? A linen closet? A bigger vanity?

- Downsizing your house to a 2 bedroom will impact resale. Could you take only a portion of the current kids' room for the master /carve out space for a bunk room? That'd technically still make you a 3 bedroom.

- Last thought: This is a simple little ranch. Beware that you don't over-do the master /make it into a bedroom that'd belong in a larger /more expensive house. The scope of your reno should fit the house /the neighborhood.