First thing I'd do is talk to your finishing guy and inquire if it wouldn't just be easier to rip all the drywall on the ceiling down and start over. Bathrooms are pretty small and by the time you cut, patch, scrape and all, you might as well have started from scratch.

The light fixture you show appears to be an "old work" fixture. That is, it is designed to be installed through a hole no larger than the one the fixture mounts to. Do I understand there's no existing fixture to get rid of? Then there shouldn't be a problem.

Make very sure that the unit that you are installing is rated for damp locations. Showers (outside the spray areas, which are considered wet) are damp locations. Many damp-rated luminaires require GFCI to achieve that rating.

Another advantage to Ron's suggestion to just rip the whole ceiling down is that it looks like there's a random junction box in the ceiling with a blank plate (first picture). If the ceiling is down, it might be easy to rewire whatever is going on there so that you don't need the junction box.

Ron Natalie & greg_2015,

Thanks for trying to help me.

I really appreciate your trying to help me. You're a good example of why this forum is a great place.

My light fixture is definitely rated for wet locations. I bought it from a high-end electrical showroom and made sure that it could be used in a walk-in shower.

The reason why I posted this thread is that my electrician had basically
disappeared on me. I kept calling him and he would say that he'll come
and install the shower light and not show up. I needed to get this
light installed since it was holding up a number of renovations that
I've planned.

Well, today I surprisingly got a call from my electrician! He asked
whether I was home or at work. It just so happened that I was off from
work today. He said he would be over in an hour.

He came and suggested we cut a new hole a few inches from the old hole.
He then installed the light. Then he cut a piece of wood and screwed it
into the wood near the old hole. Then he cut out a round piece of
sheetrock that was almost the size of the hole. He screwed this piece on
then applied joint compound over it so that it blended in with the
ceiling.

I'm now going to call my plasterer so that he can come and plaster over
the textured ceiling and make it smooth. The ceiling has these half
circle patterns all over it. My plasterer said that he can plaster over
the whole ceiling and give it a smooth appearance. This would match all
my other ceilings which are smooth.

Once again, thank you very much for trying to help me. Please let me know if you have any questions or additional suggestions.

Thanks!

No problem.

Just be aware that the junction box with the blank plate can't be plastered over. Junction boxes need to be accessible.

I am guessing the junction box used to be a light fixture. It looks like it would be in the center of the room. Most likely still needs to be accessible, but you could take off the plate and make sure there is actually wiring in there.

Yep, hopefully the electrican could have removed that box and rewired it such that it wasn't necessary.

The junction box is in the center of the ceiling. There used to be a light fixture there before I converted the bathroom from a regular tub to a walk-in shower. I also installed vanity lights and put a recessed light above the toilet (in addition to the one in the shower). I also installed a vent in the ceiling.

Behind the junction box's plate are wires. The electrician put wire nuts on them and then we put the plate on.

To be honest, I've not given much thought to this junction box. The wiring in this junction box is very old. The electrician brought new wiring from the sub-panel that I installed in the kitchen.

I suppose the plasterer will plaster around the junction box plate?

He'd better. It is illegal to have to remove any part of the finished surface to reach a live junction box.

Thanks, Ron.

I should also mention that I'm in a condo and on the top floor. There are condos below me. The condo building was built in the 1920s. The wiring in the junction box runs to the basement. The wiring for the new light fixtures and fan, on the other hand, run to a new sub-panel I installed in the kitchen. It was very tricky finding a path from the basement to the sub-panel! We eventually discovered a path by following a vent stack that ran from the basement to the roof.

To make a long story short, I don't see how we could have gotten rid of the old wiring in the junction box. Placing wire nuts on the wires and installing a plate seemed to be a reasonable solution, though it may not look ideal on the ceiling from an aesthetic point of view. But maybe someone out there has a better solution.

Again, thanks for your feedback.

If the wire serves no purpose you could disconnect the wire in the basement making it not live. Then you can abandon the wire and remove the junction box.

Vith,

Thanks for trying to help.

You've not seen the wires in our basement. They're a huge mess. This is a building built in the 1920s. I don't know how one would be able to locate the wires that lead to the junction box in my 3rd floor condo.

Can anyone suggest a better looking junction box plate?

Below is a close-up of my current junction box
plate. I bought it from Home Depot. I chose it because it was the exact
shape as my junction box.

I would have preferred another shape (like round) but I didn't know whether the screw holes would line up.

They make round ones that should mount fine to that box.
http://www.homedepot.com/p/Hubbell-TayMac-5-in-Round-Blank-Metal-Flat-Cover-White-Textured-20-Pack-LPB3325/202357990