Get a wider cabinet fillers that wide will look bad. If you go with a wider cabinet you will also gain storage and maybe could eliminate the baskets

@Patricia Colwell Consulting There are no wider cabinets in my cabinet line. This matches the bathroom vanity and medicine cabinet.

@User I found shallow baskets that will fit perfectly up there and hold my curling irons and velcro rollers. At 6' tall, the reach is very easy for me. My small hall closet is packed, and I have no other available storage, so need to use every available space.

If the cabinet line doesn't have fillers with that finish that are wide enough, you can buy 1x6 poplar board and cut to size. The cabinet line should sell matching paint, and you can paint them to match.

To attach them, screw through the side, from the face frame into the filler. It's the same method used to screw 2 adjoining cabinets together to keep them flush. You could add a 1x2 to the side wall as well, to provide support on that side of the filler, and brad nail that side of the filler to it.

@weedyacres. I painted the cabinet a custom color, so will do the poplar boards. Should the poplar boards be flush across the front of the cabinet frame, or should I cut them a little wider and have them wrap slightly over the frame edge (rabbed cut the poplar board to create a wrap effect) to eliminate an obvious seam? With the wrap, since it would be such a tiny cut (max. 3/16") I'd be afraid the rabbed would be hard to cut or break off during fabrication or installation. With the flush/butt joint, I would be afraid that when our air is dry over the winter that the joint may open up and the line between the two pieces would be visible. Any other issues you foresee?

Disagree with what your doing but you want to do it so???

Unless your willing to dismount the cabinet and glue and clamp the filler pieces then i would go with plan A.

Or push it against one wall and add shelves on the opposite side filling in the space and giving you extra storage.

I would actually inset the outer fillers approx 1/2" from the face of the cabinet as it wont look as odd. If you glue and screw from the inside of the cabinet you should be fine with expansion and contraction.

If you're set on building the cabinet out to the walls and in need of storage, why not put shelves instead fillers? Then you could keep your baskets of rollers and stuff in the little cubbies.

@BlueberryBundtcake - 6a/5b MA The spaces on each side are only 5" wide. Cubbies that small don't fit the items I need to store. Plus, I want stuff hidden away.

Since this is over the toilet, will it look strange being wider than the toilet below? Just a thought that it might look top heavy. Maybe not.

@erinsean yes it might, but I'm hoping that it will tie in with the wainscoting below that goes wall to wall. I am putting a shelf on top where I will have 2 - 10"x12" baskets. Then I will trim out the shelf with crown moulding. Sorry about sideways photo. Houzz keeps turning it on me.

It’s going to look strange, and tacky, but if that’s the look you’re going for...

I would make them flush, like typical fillers.

Is this a hall or bathroom or mud room or pantry wall cabinet? What is beneath it?

You might consider adding hanging hooks to the sides of the cabinet or to the wall -- utilizing the space differently -- towel rack or loop or hooks for hanging items that the use of them would be relevant to this or an adjoining space.

If this adjoins the kitchen, you could add a vertical drawer on each side -- either the same height or even longer (above and below) -- with shelves in the drawer ... perhaps one for spices and another another for cleaning items -- whatever you need handy where the cabinets are hung.

Shape the interior of a vertical drawer to suit what you will store in it:

https://www.google.com/search?biw=1366&bih=628&tbm=shop&ei=4-t3Xu7YDeem_Qa1q4W4Cg&q=vertical+drawer+in++overhead+cabinet&oq=vertical+drawer+in++overhead+cabinet&gs_l=psy-ab-sh.12...2009386.2018874.0.2020720.38.30.0.2.2.0.441.3193.9j12j1j0j1.23.0....0...1c.1.64.psy-ab-sh..19.9.1141...0j0i13k1j0i8i13i30k1j0i8i30k1.0.jsr9ACDHTcY#spf=1584919498551

As long as you painted the vertical drawer front the same white as the cabinet and used the same hardware, that would work. You could then add a box shelf atop all three cabinets between cabinet and ceiling ... even another beneath all three cabinets.

While I admire your ability to envision ways of salvaging this cabinet, it’ll never look like the custom built-in piece that you want it to look like; the gaps are simply too big. Your options as I see them:

• Buy a wider (and taller, while you’re at it) cabinet that almost matches your vanity. Since they’re not right next to each other, nobody will notice if the two have slightly different door styles. You could also replace the center panels with glass.
• Install wall-to-wall open shelving.
• Have a cabinet custom built to fit the space.
• Do nothing.

This seems and odd spot to store the things you mention...I might think a little on rotating things so items you need are where you need them...over the toilet for your items seems like an accident 🤷🏼‍♀️ waiting to happen

The lease expensive DIY way to actually use this cabinet would be to add a single board above and below it that is as wide as the niche and paint the boards and back wall of the niche between the boards the same color as the cabinet.

With better quality painter's tape so you can paint a straight line, you could even paint the wall on each side that same color ... or add a trim strip between the boards to cover the color change or just leave the sides walls the same color as the rest of the wall.

With the cabinet centered, you'd have a single tall narrow shelf on each side for a tall stack of wash clothes and/or small hand towels.

All these things over the toilet?

I'm guessing you want this?

look for a diff cabinet. (the doors don't have to exactly match your vanity). you could do kitchen cabinets. they come in wider widths. then just put trim molding on the sides.

or, if you really, really have to have a wall to wall cabinet to hold everything, then bite the bullet and have custom cabinet maker fabricate one for you.

otherwise, do what's been advised.
you can also add shelving for TP and stuff. (I mean, who's going to really see this?)

@User, please tell me why you think that. Is it size, style, scale, etc., that you don't like?

@suezbell it is my tiny master bathroom. Unfortunately, hanging space won't help me with the items I need to store in the bathroom. Likewise, the narrow space of a vertical drawer wouldn't be large enough either. Thanks anyway for the link.

@btydrvn, Its the only space I have left. It's just 2 steps away from my vanity (which is jam-packed).

In that case it seems all open adjustable shelves with baskets would hold the most ..have better access...look the least “rigged”..the doors just get in the way ..

@Beth H. :Yes! that is the concept. A custom made piece is out of my budget, unfortunately.

@btydrvn Open shelves with baskets is a possibility. Thank you.

In this small space open shelves will be be less claustrophobic as well

And open shelves inside the biggest plumbing bills from things falling off and blocking the toilet soil pipe! This is the worst spot in the bathroom for storage.

Since hanging bars will not help, adding the two boards -- one attached to the top and one attached to the bottom of your cabinet -- in order to create a pair of open shelves for your stack of washcloths and hand towels beside your cabinet would be the better choice if you cannot find a cabinet that specifically fits the width of the niche you have.

The accidental drop in the toilet has been discussed and disregarded by the poster as the storage is so badly needed...so perhaps a new rule to keep the toilet seat down could be implemented?

@btydrvn I have a cat. Toilet seat is always down. 🙂

Excellent....Problem solved

Beth's photos actually make me think that fillers would be a bad idea. Those toilets look jammed in a hole!

I could see putting some tall crown molding around the cabinets top though (mostly vertical, with not a lot of horizontal spread). Then you'd have a concealed cavity up there for your baskets.

Add flat or decorative (fluted?) fillers on each side. Screw from inside cabinet through the stiles. You can have them flush, or bump them out.

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Nice. I don't think fluted goes with my decor, but I hope my final result is just as nice as those in the photos.