Bees nesting?

I have recently noticed bees going in and out of one of my air bricks but as yet I have not noticed them coming into the house. Will they eventually move on or should I be worried ? tia

 

I've had some using the same location in a dry stone wall in my garden for two years. I'd be more worried about wasps in your situation @Meomye.

 

Over the years I've had a number of wasp's nests and bee's nests in various spots in the garden; we coexist until mid summer at which point the badgers rip the nest to pieces eat the larvae and leave me to deal with a big hole, stones scattered around and seriously cheesed off stingy insects.

 

We have had mason bees coming and going through our air bricks and they never caused any issues for us.

I think the amster to the question depends on the species but I doubt you have anything to worry about.

 

In theory they shouldn't be able to access the house via an airbrick if its those low down ones that vent under the floor.

 

Thanks everyone for your replies, no @pete, that is what was worrying me, it is a high one which I believe was a to do with an old boiler? I have seen the black and yellow bees (some quite big) going in there but not swarming and in large numbers.

 

Sounds like it could be a ventilator, does it have a corresponding vent on the inside, possibly with the ability to open and close it.
They could be building a nest in the cavity although they shouldn't really be able to get in to the cavity via the vent there could be a small hole in there somewhere.

They sound like wild bees rather than honey bees, if so I don't think they swarm in the same way.

 

We too have had bees nesting, mainly in bird boxes. After a few months they have gone. We just keep an eye on them and don't get too close.

But 2 days ago we went into the lower roof loft to do some clearing out and found a weird looking object hanging from the rafters. I thought it was either unknown CCTV or a strange spotlight!

I think it's a wasps nest - no live wasps flying around, but not sure if anything was inside, despite my hubby giving it a squeeze! They get in under the rafters. It could be from previous years and we don't go in the loft very often. So we have just left it.




We are now worried about where they have got wet wood pulp from to make it.

 

For the last 3 years we’ve had Wasps nest up in our attic , not last year but the 2 years previous . My OH says they take would from outside from rotting wood, take some water from a pond or any other water bucket , mix it and takes it back to the nest to make it , not from your rafters. We’ll be on the look out again this year I suspect .