To let DD build a den in the communal garden?

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We have a communal garden around our block of flats. Each ground floor flat also has their own garden.

When my DC were small, I kept a sunshade stand by the sand pit and bench (only fixed items in garden) to use when we were out.

Neighbour, when her eldest (now6) was small, fixed up a permanent sunshade. Which then became a tent with picnic table, which now has become a fenced off area, woodchip floor, tepee, picnic table, kids kitchen, plants planted into the communal area to give shade when they grow. Plus two swings on trees bordering the next property. She hasn't asked permission from anyone and even has her own garden!

TBh it pisses me off as it's the only
flat area of ground in the garden and my DC are too old/big to use it and now they have nowhere to play e.g Badminton or frisbee.

My DD, has over the past week or so been collecting twigs and lashing them together with string to make a den between two bushes in the corner of the garden where she and a couple of the older girls fit.

Yesterday a couple of kids from over the road came over to play and help. Late last night I got a message from the mum asking if she could come today and break down the den. I've no idea why. I've said I'm in and she can call and we can look at it together.

It's in my (communal) garden, not hers.
It's built with my string!
Is a den like this dangerous for some reason?

YABU - break it down
YANBU - can't see anything wrong with a den for the summer

It’s low income areas where higher amounts are incinerated but nationwide the majority isn’t.

I don't understand why your concern is with the mother who wants to take down your den, rather than with the resident who has appropriated part of a communal garden to be her private property, and even fenced it off.

Just tell the mother who wants to take down your den, you don't even live here, why are you threatening to interfere with equipment in a garden on a property to which you have no legal relationship?

And tell the person who fenced off part of your communal garden, I understand why you did that, and I've been trying to accommodate you by leaving it be, but you have actually made it unusable for anyone but your own children. My children are also residents of this building, just as much as yours are, and legally this communal area is for all of our use, not only yours. The fencing and the permanent installations of furniture etc, needs to be taken down so that my children can use the area on an equal basis.

If you allow the fenced area in the communal garden to be restricted long enough to the use of this one resident, will it essentially be "adverse possession"ed into becoming her private property?

S was concerned about the string and insurance. Thanks for the heads up about the string. I've collected all cut bits and tied up and loose ends. I've spoken to (all) the kids about danger of loose string etc. S then agreed the den can't be more dangerous than the fence to wildlife.

She was worried about it being there without permission of everyone. I told her B also doesn't have permission for her construction (see photo) and she was shocked!

She was mainly concerned for insurance purposes if one of hers got hurt or damaged something when no one from our house was around. I made it clear I don't supervise when DC are out unless I hear a disturbance - she doesn't either, so is totally ok with this. She has told her kids they can't play there when none of our house's 6 are there else they're trespassing as opposed to being guests.

So you’ve now basically set it up so she speaks to the other neighbour? Just report her yourself.

Build a bigger Teepee so older kids can fit in? Or a draped sail type roof?

Going back to your original post, why have you not tackled this? The mum can relocate all this to her garden, which is where it belongs thus leaving the flat area free for all.

Why humour her with looking at it together though? If a neighbor from across the street made a complaint to me about my kids building a den in thier own garden, I'd laugh in thier face and tel them to jog on. Me and my friends spent all summer building a den in the woods. The week before school started the council demolished it. I'm still peed off about it 18 years later 😂 We built that thing more securely than my grown up house is built 😂😂😭😭

If she is worried about insurance she should get her own insurance for her kids or ensure her contents cover would cover her/her kids. And she is quite right, her kids shouldn't be there if resident kids aren't.

What makes you think that? The other mum doesn't even live in the same block.

Exactly. But is more than willing to confront a situation and the OP has done out of their way to drag the other mums stuff into it.