You think 2 inches matters in either direction? It does not.

You draw it all out in paper with your sink CENTERS, Do it on the wall. Make certain you like the look and avoid crowding. I find this much over a 60" vanity a bit of a cluttered feel, but up to you,

We've no idea if free standing, in a niche, you have ONE adjacent wall or anything else: )

For that size vanity I would probably do one cut-to-size mirror with the sconces through the mirror. You can use molding or tile to frame the mirror or just order it beveled. I agree with Jan that it might be too much for a 60" vanity.

A 5' vanity with duplicate sinks is already very cramped.

Go with one large mirror (matching the width of the vanity); you say you're having trouble finding a mirror -- have one custom cut. It will probably cost about the same as one currently-trendy framed mirror, and it will definitely look better than cluttering up the already-busy area with two mirrors and three sconces. It will also feel more comfortable /more functional than a skinny 20" wide mirror. Have the mirror framed in the silver-tone you're considering OR have it match the vanity color -- this won't cost much.

I have a double vanity inside an alcove that is 83" wide - I have two mirrors (24" x 36") + used three sconces. It doesn't feel crowded - however, I wouldn't want to have less space than that to mount my two mirrors and three sconces (4" backplates).

My vanity width = 83"

two mirrors = 48"

Three sconces = 12"

Total width required = 60"

I have 23" of space to be split for all gaps needed around the sconces. That left me with 7.67" of gap space for each sconce = 3.83" on each side of each sconce = enough room between the side walls/mirror edges and my three sconces.

Calculations for your vanity + mirror + sconces:

Your vanity Width: 60"

Two mirrors: 44" (2 x 22")

Three sconces: 13.5" (3 x 4.5" sconce backplate)

Total width required: 57.5" (44" + 13.5")

That leaves you with 2.5" of space to be split between all gaps needed around sconces (60" - 57.5").

Sconces should typically have 2" to 6" of space between them and the edge of the mirror.

Also, you want to have your mirrors centered over your sink base = the mirror will take up all of the room over the sink bases = the outer sconces will not be mounted over your vanity.

Is the vanity inside of an alcove?

I have 78" vanity in one of my guest bathroom with 3 sconces and two 20" x 48" recessed medicine cabinets. I don't love the end result with the sconces and should have spent a bit more time thinking it over. The space on the sides was tight and I had to find long sleek and very narrow sconces, which are not usually my style. My mother also hates the light they produce, so I might look for replacements, but those side dimensions are very limiting. Maybe I'll just get rid of the side sconces and put a larger double sconce in the middle. I have plenty of other light from recessed lights in the bathroom and shower.

I couldn't see fitting all that with 60" of space.

I have a 60" vanity with double sinks. Each sink has a recessed medicine cabinet above it. No sconces, but we have light fixtures over each cabinet. The space is what it is, couldn't make the vanity longer without much disruption/construction/big budget, so we did with it what we could. It's in our vacation home, so it works for the limited time we're there.

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I didn’t post photos originally because I don’t have great photos to share yet. The first photo is the current space with the vanity marked out with painters tape. The blue line closest to the bathtub is where the new bathtub will extend out too. The current mirrors are closer to 40 inches wide (36 inches of glass) and the blue tape on the right side is a 24 x 36 shape. The second picture is a ChatGPT rendering, but the mirrors and sconces aren’t quite to scale. @chispa, I should have enough room for the sconces (the tightest space will be between the mirror and the door) and @Diana Bier Interiors, LLC I want taller mirros because the sconces are going beside the mirrors and not above and I didn’t want a big gap above the mirrors, but otherwise your photo is similar to the look I’m going for. @chispa disregarding the sconces aspect, were you satisified with the 20 inch wide mirrors? And, @JAN MOYER, I can 100% see a difference between 20 inches and 24 inches, espeically when it’s doubled with 2 mirrors. I might be able to find a 24 inch wide mirror, but I worry that will start to crowd the sconces. That’s why i was trying to decide between 20 inch or having a custom 22 inch wide mirror made. Obviously it’s easier to go with ready made, but at $500 a piece for the rejuvination mirrors and the possible hassle of a return, I’m trying to get it right on the first go. Personally, I much prefer the look of two mirrors vs one large mirror.

You said...................

"I was looking for a mirror that was 40 inches tall by 22 inches wide, but have been unable to find one in the rectangle/polished nickel design I want. Rejuvination does have their thin metal frame mirror that is 20 inches wide by 42 inches tall. My question is whether I will find a 20 inch mirror............."

Now read again what I said?: )

" Do you really think you wlll notice two inches? Meaning 20/22 on THIS?

I suggest you get it right now, because a custom will cost you DOUBLE or more

You will be at the mercy of mistakes already made: ) and the first of these was crowding., buying three sconces etc. in an already crowded bath, with a not great entry.point.

The space as is, demanded a 48 0r 54 inch vanity, single sink. Sorry...

@HU-26843280116, the 20" width of the mirror (medicine cabinet) is just fine. I agree with maximizing the height of the mirror. Many people use mirrors in bathrooms that are too short/squat.

Consider how tall you and your partner are. If both of you can see yourself in the mirror, it doesn't need to be much taller. Personally, I think that 20" x 40" is too tall and narrow; I'd want something more proportional.

Please see if you can draw it out on graph paper, with the vanity sizing and sconce spacing. And compare that to the AI rendering. When I did that in my bathroom, three sconces spaced evenly did not work, so that's why the over-the-cabinet lighting instead. I also think you need to move each sink closer to the center--as it is now there's not much room on the ends.

20 x 40, is really no different a ratio than the oh so common 24 x 48.mirror on any wall.

I totally understand why she doesn't want a ton of drywall above, Length of sconces matters too, along with where they are mounted. The vanity is ordered, the sconces as well, so we're late to her party.

Bottom line is one thing:

Sixty inches in never really enough vanity for this look.....proliferating all over the internet for over a decade.

Further? I just don't understand the "sharing"/ I want nobody in the bathroom with me. It might be the LAST bastion of privacy..........on this earth. Share other things; meals ...a bed....this can't be the last time you see your lover pal.

I'm not keen on sharing either, so I want my own sink and vanity!

Other than each of us having our own bathroom, that's the compromise we've made. When you live alone, you don't need to compromise!

Thank you everyone for your comments, especially @chispa providing feedback that a 20 inch wide mirror works for them. This is the primary bathroom at our vacation home. It is adjacent to the three bedrooms. There is a second full bathroom downstairs, but used mostly for overflow when the house is full. Two sinks is a must. @Diana Bier Interiors, LLC in the new vanity, the sinks in the picture with blue tape do not reflect the new vanity spacing. The sink spacing in the new vanity is proportional to the cabinets. The primary goal for the remodel was to create a bigger shower space and a bigger more comfortable bathtub (I’m a regular bathtub relaxer). As a result, compromises had to be made in the size of the vanity. In reality, the current vanity was too big for our needs in a second home. My husband I are the primary users and the drawers and cupboards have never been more than 50% utilized so we’re pretty confident the smaller size vanity will work for us from a storage perspective. The vanity has already been constructed, but I ordered sconces that can be returned, in case I decide there isn’t enough space in between the mirrors for three. Rejuvination has a trickier return window so I have to time the ordering between summer trips, their delivery window and my project in early September. The wall space in between the door fully opened and the bathtub, that can be used for a proportional hanging of sconces and mirrors is approximatley 76 inches. With 24 inch wide mirrors that gives a little over 9 inches of space for each sconce and with 20 inch wide mirrors it’s 12 inches. Thanks to @chispa input, I think I will order the Rejunvination 20 x 42 mirrors, but also keep looking for a 24 x 40 or 42 with a reasonable return policy as a back-up.