Opened an empty space in my house, what the hell are these ?

As stated they are wasp nests and you'll find them in most peoples loft space somewhere.
They are only used once normally so chances are they are vacant and can simply be removed by yourself.
 
They do mean the wasps get in and out easily to that 'free space', yu might want to consider that in your future plasn, alongside insulation, as cold storage space is usually fine, but unventilated it'll get mould and lots of it.

Also empty nests are a good deterrant from wasps building a new one, folks who get them building at the eaves of houses sould inflate a paperbrown bag and hang it in the eave, and queen will see it and move along elsewhere.

Those chinese style paper light covers do the trick well also, so might want to suspend one at either end of that 'free space'.
 
Id just put that bit of covering back over and sell up ASAP. You've opened Pandoras box.

P.S dont leave a forwarding address
 
if it's empty leave it in place, apparently they won't make a new nest close to an old nest - if it's not empty i would suggest to not use raid wasp nest killer, useless can that makes angry wasps (although slower more dopey ones)
 
It is just where a queen and a few drones have hibernated over the winter. Usually they wont build in the same area. They "should" be gone by now. As the season has started now.

If you cant see an exit hole, they are either still inside or have died.

Edit

Forgot to say it could be the start of a nest.

If it looks grey, then its made it over the winter.

Yellow or gold, then its a start of a nest.


IF AND A BIG IF

If you want to kill it use ant killer powder, that's what pest control users use like my dad :rolleyes: If you go for powder from say homebase it will be 0.5% and it will kill the nest within 24hrs.
 
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There looks to be daylight coming in in the far end of the photo, they probably got in through there. I'd squirt some expanding foam in.
 
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