Lovely tiles being removed by next doors builders

This. Make sure you have lots of photos and write to them stating they do not have consent for any work to your property and that you will expect all damage to be made good and the finish reinstated to original.

Tell the neighbours and the rendering company no, in writing.
Have a look at your deeds and see if the divide is half and half of those tiles, it may be that they're on your side if that makes sense especially as it goes to the floor on your side
What idiots your neighbours are

Still not sure I know what you mean. Do they mean to render their half of the wall vertically?
It'd look pretty clumsy even if they did a good job, and I can't see how you could preserve half of a strip of tiles.
I'd probably ask a solicitor about ownership/permission before going to the neighbours in the hope that I could then present them with a fait accompli.

Ah thanks!

The difficult thing with a shared feature is when you get two opposing sides on what to do with the status of the feature. But they can't damage them as you both have ownership of them, and it would look weird and spoil the feature if they were to render their half. The only solution I can see is to render up to the tiles and leave them showing as they are, but I'm guessing the neighbours aren't actually keen on them and don't care if they get spoilt or actually want to hide them.

If it was me I would ask them if they can leave the tiles as they are, and see if they can come to a compromise and render up to them but not over them at all. If NDN don't like them, would the tiles come off and maybe put elsewhere on OP's property?

I think you need to make it crystal clear they can only go up to your tiles.
Will render stick out a bit as well?
You will need to do in writing/ duplicate to protect yourself. Maybe copied to the builders? Be very firm.

You may need them to source original tiles they damage, and make good, I’d be telling my neighbours directly, not shillyshallying around discussing things with a sub contractor. Your neighbours have instructed the contractor, you need to make it clear you have not permitted any rendering or damage to tiles your side and are expecting a clean finish between the old and new work. This isn’t unreasonable at all.

Think OP means the neighbours are clueless and it’s the builders who are proposing this daft idea.

They've decided without permission to damage her property and then offered to charge her £200 to have work done that she doesn't want done. Politely telling them that she's not agreeing to this is much less hard than they deserve.

Where I live you have to get planning permission to render the front of a property so it might be worth checking if yours is the same!

Can you stop following me around on every thread please?

Ach don’t go this hard right off. Just speak to them, say can they render up to the tiles as for some reason you really like them and want to keep them.

I'd just either pop a note through their door or speak to them and say,

"After giving the matter some consideration I do not consent to any building works which are likely to affect the tiles on my property. Many thanks."

If they tell you they are planning to go ahead anyway, make sure they know you will take legal action.

Looking at the photo the only answer is to leave the tiles in situ and the neighbours render to the tiles on their side.

You want their names??

Print off a letter saying they aren't to touch your property or you will seek legal advice and give it to the builder.. Speak to your home /buildings insurers and see where you stand.

Who are the actual neighbours sorry?

Who owns the wall? It looks as though their side has been rendered to the start of the tiled area but yours has been rendered across the tiled area, is that right? But the tiled area is definitely 50/50 yours and the neighbours? Is there brick underneath or block work? They shouldn’t be causing damage to your property without your permission but it sounds like they’ll be going ahead anyway. I would perhaps consider asking to keep the tiles if they were primed and painted in a matching colour. Unfortunately I don’t think there’s any way they could make it look good on your side without rendering the whole area

I too think this might come under party wall. They cannot remove half the tiles so the tiles will be destroyed. So they need to make it good and pay to do so. They also can't remove the tiles without your permission as 50% of them.beling to you. They either don't realise this or they are deliberately trying to bamboozle you.

Can you explain to them and see what they say?

Oh my! Your photo shows just how terrible and tricky it will be! There's no way the builders will be able to cut those in half without damaging them all. Agree with talking to neighbours, making it clear you say no and taking 100 photos. What a travesty!

Having seen your picture, it’s absolutely bananas that they want to render over the tiles, and even madder that they’ve suggested doing half! I think it’s mad they want to render over the brick, but people have funny ideas.

Just say you’ve thought about it again and don’t want the tiles touched.

@JusteanBiscuits maybe they can mask
the tiles and not render them? Perhaps you could ask neighbour if they’d be ok with that?