Depends on the mirror you are placing.
Usually the mirror is 42" H. How tall are your cabinets? are you placing the mirror directly above the backsplash?

I like to place the wall sconces 6" above the mirror (to the bottom of the sconce not to the center)
Good luck.

I was thinking of a framed mirror above the sink (in the center of the vanity), with a sconce on each side of the mirror. Mirror about 24w x 36h. Top of mirror about 6ft high. Does that sound right?

-t

I think the recommended height is 5.5 feet. That's where we placed ours and they are just perfect for us.

between 63" - 66" from the floor.

Be sure you have sconces that take large-enough wattage. DH and I each have a pair at our mirrors; each takes max of 60W. They are sufficient, but in hindsight the ability to go to 100W would have been smarter. Ours are up-lights, frosted, on dimmers. YMMV!

chisue, if you want a crisper, brighter light you may want to try the GE Halogena 60w bulbs. They give off lots of bright, clean light. They are not as energy efficient as a CFL, but more efficient than a regular incandescent. I just picked some up from HD yesterday and I believe they were $5.49 for the package of 2.

Thanks, all - very helpful. I had just sort of measured for myself to see what was comfortable, and came up with 66", but builder was questioning it. (maybe 'cuz I'm just a girl...)

Chisue - what is YMMV?

Your Mileage May Vary... meaning you may have different results due to different circumstances.

brutuses -- Can you dim these? I love the 'glow' when our sconces are on dim. I haven't gone to CFLs, waiting to see some that can be dimmed...also unhappy about the mercury problem they present. Yeah, I'm a hanger-backer about new and improved anything. (I really need to replace the Flex-Seal pressure cooker, though. LOL)

Yes, you can dim them and forgive me, they are Phillips, not GE.

Thanks, I'll take a look at PHILLIPS Halogena.