This was my thinking as well. If OP does not know how to replace a toilet, now is a good time to learn.

Our local Habitat for Humanity ReStore often has new toilets in the box for under $100.

> You should leave the trim and replace the window. Avoid all these problems

The advice I've always heard is to always do a "brick-to-brick" replacement. If the old window was leaking, the damage will be hidden beneath the trim. Replacing just the window means that the leak is still there. A brick-to-brick replacement gives you the opportunity to repair any damage that may have occurred.

This

Replacing the toilet yourself is likely to be cheaper than having a plumber even just come out for a service call.

you may be able to pop the arm off from the underside of the window, if you need to close it for now. Remove the arm assembly so you can tinker or replace later. check the inside of the arm, maybe its stripped and you only need a new arm. if its the assembly that's stripped, you'll likely need to replace it all.

I threw down some astro turf rolls from Amazon we had lying around. No issues so far. Dog uses it for the bathroom sometimes and it rinses clean and poop picks up easily.

Truth!

That window looks like a vinyl window. Somewhere on it will be sticker that shows the maker, serial number, and the size. You find that and order a new replacement sash and put it in. I can't tell from the picture what version of window you have. It might be under warranty and you get a free sash due to 'seal failure'. Depends on who made it.

It is very unlikely that the little crack on the inner glass of a double pane window is going to cause much cold air to leak in. It is more likely coming from around the window due to poor insulation when it was put in. Can't tell because the picture does not show the entire installation.

There is a screw underneath the crank handle: Image, although it won't budge. Do you think I should try to force it?

Frost king plastic window cover

while replacing your window, I highly reccomend the Double Double! The insulation is much better while being inexpensive.

Lol I was close

Is it possible to repair and get it water tight/safe? yes. you could use silicone outside, some kind of wrap around brace. It'll look like shit, but should work if you're in an apocalypse/3rd world country type situation.

Is it worth it? under normal conditions? HELL NO!!!!!

The toilet needs to be replaced. This is not something you want to mess around with. It’s a matter of when your toilet is going to fail rather than if it will fail. The cost to replace a toilet is a few hundred dollars for the toilet and an hour or two of a plumbers time. When the cracked toilet fails it can lead to damage to your bathroom and other rooms in your house which could cost much more and your still paying for the replacement toilet and plumbers time.

This. I don't know if you can get it in Great Britain (guessing) but they make clear duct tape - if not, slap something similar over the crack and cover the window with a cheap blanket secured tightly with push pins around the frame.

Looks like a double pane, inert gas filled window, and if the outside isn't busted, in theory, shouldn't have lost that much R-value (insulation ability) - might be something else going on that it exposed.

(Edit: maybe not? Bad picture.)

Anyway, do the above and feel around for drafts coming through it or the surrounding trim.

A windshield repair kit would sort the crack out.

It's objectively not a real house, but that doesn't mean it's not a real home.

I'm sorry you're dealing with that, most window places are an absolute ripoff. This should cost less than $500 all in--materials and labor.

Try calling up a building materials store that sells windows and ask them for a recommendation for an installer for their windows--better chance to talk to someone that knows what they're doing.

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The super cheap fix is tape a plastic sheet over the window, in front of it. If you can make two layers that don’t touch one another, you’ll get better insulation.

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Order a replacement window-they don't have any flange on them and can be made to size. Rent or borrow a trim brake--then some white aluminum trim coil to cover the gap and make a sill angle. You don't have to have wood all the way around, just behind the screwholes.

Storm windows might help a little.

Generally, anywhere cold air can get in (or hot air get out) is bad.

Easy temporary fix is to get some sort of adhesive plastic and put it over the whole window frame, like you're saran wrapping it. There's kits for this at home depot or lowes or whatever.

You can then also drape a curtain, blanket, etc over the window in order to help insulate

There could be a tiny screw on the handle to tighten it. If not, you probably will have to replace the mechinism...https://www.swisco.com/