I would take the unused backsplash back and get the regular thinner type. Looks much nicer than that thick stuff you got, whatever it is. Doesnt look good on the wall either, and actually looks a bit sloppy too.

Is this a DIY job? If so, take it all down. It looks like a total mess. You need a pro.

Agree with cat_ky, remove and replace with thinner tile. Problem with window trim resolved.

You can take off the existing trim. Then trim the window with thin pieces of plain stock to build up thickness behind your trim. Then install your profile over that...you are making thicker on the back side, building it up.

Looks like a rookie mistake that can happen to those of us who try to save $ and DIY. The tile likely won’t sit right at end of runs either let alone around your low profile trim. I would rip it out, get the proper thickness tile and do better.

This is a DIY job and the tile is Zellige bejmat which is hand crafted and thus size and thickness is irregular. The imperfect/sloppy looks is part of the magic of the tile IMO.

Seems like the simplest solution is to add some plain stock behind the profile as a spacer of sorts

Here is an example of the tile installed

I also agree: your tile install is poor and messy. I know that most people spend a lot of time in their kitchen; dont you want it to look great? So: get some appropriate tile and spend time finding a tiler who is experienced; read reviews, look at their portfolios, and interview them. Best of luck on your journey.

Do you really want that in a kitchen? Looks nice in the inspo photo but IRL does look sloppy and seems like it would be a PITA to keep all the edges clean (because, you know -- it's a kitchen and it can get messy in there...)

You are going to create clearance issues with your faucet and range. Plus that install is complete shite, and that has zero to do with the irregularity of the tile. It has everything to do with the lack of skill and experience of the tile setter. You cannot use mastic with that type of low temp fired ceramic. You will get stains bleeding through. You have to use real thinset, and soak the tiles in water first. There is not nearly enough coverage, as in way deficient, and none of it is directionally combed. What coverage there is has been squished into the tile spacing or on the face of the tile. Just terrible.

Take all that down. It will practically fall off. It’s ruined and contaminated. You will have to source more. Meanwhile, find a skilled tile setter.

Just because it’s Zellige tile, doesn’t make it attractrive or appropriate for a kitchen.

Being unusually thick should’ve told you a pro was needed to do a proper install. A professional tile setter would’ve taken into account the uneveness of the walls, the depth of the window trim, and the correct material and prep needed to set the tile, and…

Look what’s happened at the outlet in the pic. It’s buried far too deep to be useful or esthetically pleasing. There’s not even enough room to install an outlet cover, the way you’ve got the adhesive material and tile abutting it. How are you going to correct that?

Even in the pic you provided of the tile installed, it’s unattractive…and, boy oh boy, it’ll be a bear to clean.

Please rethink using that tile. Go ahead and take it down. You need pro involvement for any future tile install.

Have you taken a chunk of trim to a local lumberyard for advice on a taller profile? (You'll need something better than a Home Depot or hardware store.) Palimpsest's suggestion is a good one too--and you might need a lumberyard for the right size wood for that as well.

Or you can frame the window trim with a taller skinny piece which would alter the profile a bit but might be the easier way to do it. Check out "backband moldings"..

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Obviously you're going to pull out the outlet, which is required for ANY tile install. Hope you can get the mortar off the front of that tile! I can't tell at this stage if it will look bad or not. I think it will look fine. It's an interesting tile.

I don't know that we can automatically say that there will be interference with the faucet. 3/4" backsplash material if you are doing slabs or a short one in stainless steel are not all that uncommon. It really depends upon the sink itself. Not every faucet is right against the back.

Everybody has different levels of quality control, particularly when doing DIY. I see things in here all the time where someone is complaining about how one thing looks and I look at the photo and think, "Well what about that and that and that?" and the OP and everyone else seems to think everything else looks fine. I think rustic tiles often look pretty lousy going up, and sometimes it looks a lot better once grouted. If the trim covers all the edges we see now, maybe this will look better. It really only needs to satisfy the person whose house it's in, not a bunch of perfectionists on line.