Neighbours have thrown my fence into my garden and caused damage

Why wasn’t the fence removed from their side once the extension had been built? Should have been removed there and then. Very inconsiderate. Whether work is still being done or not, you’re at fault here, not your neighbours. You’re moaning over a few damaged pots when they’ve had to put up with your entitlement.

If someone shoved something on my garden they would def be getting it back and not in a friendly way

You’ve pushed a fence onto their property, sound like you’ve left it there indefinitely or without an explanation and you’re annoyed that they’ve chucked it back into your property? Bet they’ve had a nightmare with your building work if this is your attitude.

Unless I’ve missed something, it sounds like you left it up to your builder to come to an arrangement with your neighbours and he didn’t fully explain to them what it would entail. As the property owner and resident, you really should have spoke to them yourself to avoid any misunderstanding.

Just seem a bit strange you went above and beyond to put temp fence up for there benefit
you could of just taken it down and there dogs there problem

has there been an incident ?

Yes, this.

"We required two - and one was for an extension not done strictly in line with the Party Wall Act."

Wow! You sound exactly like the sort of person I would avoid.

You do understand that the Party Wall Act only applies before any relevant work has been completed?

Asking them for money?! You’re nuts. Try apologising for the inconvenience

This. 🙄

... they moved the fence, temporarily to avoid the neighbours free-roaming dogs escaping through the no longer secure proper boundary.

With the agreement of the neighbour.

So yes, I can understand the OP's confusion as to why the fence has been taken down and chucked over - unless the boundary IS now secure as far as the neighbour is concerned.

I can see misunderstanding occurring there - my dogs would need a 6ft fence to stay my side of it. So I would welcome a temporary fence preventing their escape until the building work is pretty much complete, to the new wall.

However if this neighbours dogs only need a 2ft fence to remain secure... they may consider the need for the temporary fence to be over, and irritated that it is still there...

and he rebuilt it with about 6 new posts and created a box which went o to their land only by about 2 foot - this allowed us to build the wall

You annexed a portion of their land to build your extension? Good grief 😮 No wonder they threw the fence back.

First poster nails it again

I posted about an indemnity policy from recent experience. We required two - and one was for an extension not done strictly in line with the Party Wall Act. Not saying it’s a magic fix but it solved things for us.

www.gov.uk/government/publications/preventing-and-resolving-disputes-in-relation-to-party-walls/the-party-wall-etc-act-1996-explanatory-booklet

OP, I suggest you take a read of the Party Wall Act guidance….

Rather than asking your neighbour to compensate you for your broken pots, I think you should be compensating them for their fence.

Of course you are 100% right- and you should ask for a contribution towards your extension as this too will improve their lives.

The very LAST thing you want to start is a neighbour dispute over a few pots if you are planning on selling soon, especially after you've disrupted their lives with your building work.

Mind you that'll be the leat of your worries if your paperwork for the extension isn't all AOK

Did you personally (not just via your builder) have their agreement to keeping your old fence on their land for the time it’s been there?
If yes - they’re in the wrong.
If no - you’re in the wrong.

Why not do it now and offer your neighbour compensation for the problems you've caused already

YABU
not surprised the neighbours did this. I call reverse and if it is then you are even more unreasonable for starting a reverse.

Your builder should have remove the fence properly - not left it on their property. Your builder is telling fibs - 1) the builder should not be leaving rubbish in any garden. 2) If he has to e.g. all the materials are already at the site and he comes in his car not his van, and then is left with something too big to remove in his car, he should be leaving them in YOUR garden, not the neighbours.

If the fences were left somewhere that precarious, better they should fall on your plants than the neighbours' dogs.

If you really think the builder is to blame then talk to him, but as for the neighbours, count yourself lucky that your building work only caused you to have to replace a few pots, not pay enormous vet bills!

Aw mate sounds like you fucked up a bit!

I'd go and speak to them. You'll not really get constructive comments here as half the posters are determined to wilfully misinterpret what you've said to declare you a CF.

If the construction currently means that their garden is not secure for their dogs, I would definitely go and ask what they want you to do, as dogs getting loose is a real catalyst for neighbour disputes and aggro!

It was probably the last straw on their nerves. This sort of disruption is a massive headache to the neighbours, those building never seem to give a shit that they're doing their neighbours head in. No I wouldn't seek compensation if you want some sort of relationship with them once you've stopped the noise

No Party Wall Agreement is required! Please stop scaremongering.

I also wish people would stop thinking that Indemnity Policies magically fix everything.