So I am spoiled, okay. I will freely admit that there are a lot of hardships I have not had to deal with. I grew up sharing a bathroom with 2 boys and never had my OWN bathroom until I was grown and in my own apartment alone, and until then I didn’t know anything different and never assigned sharing to being a hardship or not.
But, in college, I was one of 4 ladies sharing a 2 bedroom 1 bath apartment. yeah, that took scheduling. It was do-able, obviously, but annoying often. I also have always lived in the deep south (like Florida, or practically Florida) where it is flat and there ARE no basements. You just can’t have them here. The water table doesn’t allow for it. So having to climb stairs for minor things is not something I take to easily. Climbing stairs when I have “to go” would be a major annoyance.
My parents now live further north and have a walk-out basement in their home. They have 2 full baths upstairs. They also have finished their basement over the past 7 years since they built the home. It has 2 living areas, a sewing room, 2 bedrooms, a bar sink/mini fridge, single car garage and walk out covered patio. And a bathroom. No tub, shower only. It didn’t start out nice and finished though. The bathroom was done, but had no handle on the bathroom door. The floor was painted cement. There were no baseboards, or other trim. The closets were an empty space with no rack/shelves and no doors. This is how it was when our family would go to visit, and we stayed in the basement. As did/does every other guest who visits them. It makes it more private for us AND for them. And if we had to trudge upstairs to use the toilet every time, I’d be inclined to get a hotel instead. What a pain it would be.
The bathroom worked. The rest… well, it worked too, it just wasn’t “finished”. Over time, my parents did their own trim work (windows, closets, baseboards even), hardwood floors, and painting. At 65 years old. And it’s a huge space! Now it is gorgeous. Do you know how often they used that bathroom during the process of finishing the rest of it? A LOT.
I know you are thinking that your 13 yr old can deal with it, and yes, he probably can. But the whole point of the basement is the additional living space, right? Not just the bedroom? If you are hanging out in the additional living space, are YOU going to want to climb the stairs to go to the bathroom? If you have outside access (walk out door) down there… consider that THAT is where you/your kids might be coming in/out from doing yard work or playing outside. My parents use their downstairs bath when no one else is there. They sit out back with the chiminea (sp?) and a cup of tea or whatever, and pop inside to use the bathroom without having to climb the stairs. Or when they are mowing and are dirty. Or planting in the garden. Or having lunch. It is just a few steps away, and NOT upstairs. And it matters… they are 70.
For your 13 year old? Maybe not so much. BUT, I would point out, that your son padding a few feet across the floor from his room to pee during the night is a LOT less noisy than a 15 year old tramping up the stairs to do so.
Especially if he takes stairs like my husband, lol.
He will likely be thrilled to have his “own space” even without the bathroom, at first. But it will quickly become a major nuisance, I would imagine.
If it were me, personally, I think I would do a very minimal, practical bathroom (toilet, standing shower, pedestal sink) and then use whatever budget you have left to start the rest. If you can’t finish the rest out completely, then finish it on your own over time. Your son can use one of those rolling racks for his closet until you can finish it. He can live with sheet-rocked walls that are primed not painted. He doesn’t even need baseboards!
Just be sure you plan how to provide storage in the bath for towels, etc. A shelved cabinet (closed with a door, kitchen cabinet sized) over the toilet worked well in one of the small apartments I lived in once. You can add that later, but figure out how you will do it in advance so you can be sure you know how to configure things to allow for it.
In my mind, not quite completely finishing the “living space” would keep me working towards getting it done; vs. putting off the bath and using the space as a closet “temporarily” would tend to keep pushing it to the back burner, until 10 years from now, there still would be no bath.
And yeah… if your son eventually comes home with his wife/family to visit, YOU will wish you had a bath down there for them to use! LOL