Masonry bee?

Masonry bee?

Observation - Masonry bee? - UK and Ireland. Description: The warm, south facing wall of our house has been buzzing with numerous insects crawling in and out of cracks in the mortar. Some get into the kitchen. Are these masonry bees? How much damage might they be doing to an 18th century building?

The warm, south facing wall of our house has been buzzing with numerous insects crawling in and out of cracks in the mortar. Some get into the kitchen. Are these masonry bees? How much damage might they be doing to an 18th century building?