You want to position the sconces so they are just high enough that you cannot see the light bulb. That depends on the style of the sconce. Some sconces only shine up, some have shades and shine down, so it depends.

Mine are 5' from the floor (to bottom of sconce) and my foyer is cathedral 2-story. It is new construction condo complex and the builder's electrician did them all this way.

For what its worth, when I first saw the sconce location that they had, I was totally perplexed how the furniture & accessories would set up. It seemed totally ridiculous. But as I got going adding my stuff, it actually made sense.

It seems a good height for ease of changing lightbulbs too.

The base of my sconces are 60" from the floor as well. Our ceilings are 8'. The previous owner installed sconces and this is what she did. My sconces are 14" tall, so the top of my sconce is 74" from the floor.

Hope this helps!

My sconces are 15 inches tall. The bottom of the sconces are 58 inches from the floor. The ceiling height is 9-1/2 feet.

I totally forgot about the nifty app Horchow has to put their things in your rooms. Below is a picture of similar sconces (not the ones I've bought but close in size and weight). Using the lamp that I've blotted out of the picture, I scaled the sconces to what I believe is appx their correct size.

This is more or less the same set up that I will have in the new house. Same etchings and same chest. What do you think?

So what is that measurement? Hard to tell from the photo without seeing the ceiling, but I think they look a little tall. or perhaps it's just the oddness of the mock-up.

I measured mine. they are 64" to the middle of the junction box. My ceilings in this area are 9' to 12'.

These are 7 years old. Looking back, I realize that the lighting guy should have suggested I get something larger.

In my oh-so-crude mock-up, the center of the backplate is at what I guess to be 60" from the floor. The total height of the sconce is what I think would be 24" but it looks a little larger to me. I measured the lamp. From the tabletop to the middle of the shade is 24".

I have attached another photograph with a large white diamond about the height and location of ONE of the sconces. (The SnapShop app isn't hard, but it can be a little finicky. I didn't think I could make the sconces small enough to have a useful photo). I think the sconce will actually go from the middle of the lower picture to the middle of the upper one.

I estimate the light bulb in the sconce will be about where the top of the lamp shade is in this picture. The lamp will not be there, but the chest and the etchings will be.

So, what do y'all think now? Too low? High enough? Too high?

This is the foyer of my old house and shows a 12' ceiling.

I am now seeing the sconce bases on your original mock-up, lol. I didn't see them earlier. Must have been a glare on my computer screen. I think they will look good at that height.