I would start by posting a layout of the space - where doors, windows are. And what do you want to include in the master bath besides the laundry- double vanity, separate soaking tub, etc? It's hard for anyone to offer any suggestions with so little info.

I'm also curious as to why you want the laundry there? Or is there just no other option?

We are converting the rear of a tandem (2 car one behind the other) garage. We moved the laundry out of the basement when we moved in 8 years ago and put it in the rear of the garage. ( I have a bad ankle so stairs were a problem! Hopscotch accident at the age of 35 LOL) We currently have a standard 5 x 8 master bathroom that is adjacent to that space. The 13.5 ft with is set but the entire garage is 28 ft and the remainder will be converted to a tv room. There is currently no windows so everything is flexible except an exterior door to that leads out to the patio (hot tub). It is flush with the corner of the 13.5 ft back wall.

I would like an oversized soaking tub, separate shower, and double vanity but not sure I wouldn't prefer 2 separate vanities (1 small & 1 larger).I hope that makes sense! I appreciate any assistance!

Please provide a drawing or at least a sketch, so we can see the 5x8 bathroom in relation to the master bedroom and its closets, and its relation to the garage space that will be integrated into the larger master bath and where the door to the hot tub will be situated. I still have no idea where your laundry and bath are except that the back wall of the garage is 13.5 ft and there is a door in one of the corners (or maybe the hot tub is even with one of the corners)! More information is needed! Also, will the laundry equipment stay where it is, or will it be moving? Put it in the drawing, too. Do you have heat in your current laundry room? If not, we have to add it to the new area of the bathroom if this is not in Hawaii. Put all of the current plumbing in the drawing, as well as any walls that are load bearing. Also indicate where the electrical circuits are currently and you better check if you have room on your electrical service for the new circuits that will be needed.

Do you and your bad ankle use make-up? Would you prefer to sit and do hair and make-up as you age, instead of standing on a hard concrete-based surface? How much natural light would you want? Are skylights a possibility or will the neighbor then be looking down into your bathroom? Is there a view in any direction that you would like to make use of? What is the climate where you live? Do you need a secondary heating source like a heated floor, or is that overkill? That shower - do you want a simple one with one showerhead, or do you want body sprays or a hand shower or rain head, too? Steam shower? If you want a steam shower, add another electrical circuit. One person or two person shower? Bench? Tiled or fold down or teak stool? Tub is to be an oversized soaking tub. Free standing? Tub Surround? Jets or bubbles or just smooth inside? If it has jets or bubbles, add another circuit. Porcelain on cast iron? Steel? Resin? Copper? Acrylic? Do you already have a vented fan that vents to the outside? If yes, great. If no, plan on that and a new circuit for it, especially if it has lights and a heater in it, too.

More information is needed. At least a drawing with the rooms as they now are indicating if the walls are load bearing or can be removed.

You go Nancy!!! Yes note load bearing walls! My washer dryer needed to be placed along a load bearing wall. Otherwise if you are on wood joist you could be creating a trampoline effect when the washer gets spinning.

Please post a layout with dimentions like Nancy suggests. She has great advise and has been very thoughtful in her own layout. This layout you want will not happen over night. Expect to be flexible. Know what you are needing and what you can reconsider. I would do function first, then do the style. Do not let style dictate your layout.

I started out with a 5x8 bathroom and now have a 8x10 bathroom with a small laundry setup and shower. I took the tub out and relocated everything in the room. I even put a window in. I spend weeks with this layout and altered it about 6 times, adding length, switching layout from one wall to the other, expanding and subtracting cabinets, etc. I bounced ideas off of others.

We need plans, it can be drawn up on graph paper, scanned into your computer, then use the "photo button" below text dialog box to post it. You can post up to 10 images I believe with each posting.

I would start on Houzz.com and start a selection of Ideabooks.

From these pictures you can form your wish list and share your vision more clearly with your builder.

Houzz Ideabooks written by John Whipple

The link above will point you to a load of idea books relating to shower construction. Maybe a few will be helpful to you.

We are giving you a lot of "homework" to do, but we are not trying to scare you away. We LOVE to design things. My bathroom is one of the last things I will be designing (unless I win a lottery) and so I am left to helping on other people's stuff. I am in a holding pattern on my bathroom, kind of making final decisions and buying a few things while I wait for the BIG purchases I will make once my contractor is on the project.

Life with only a half bath during construction is not going to be fun.