The official name for the spider is the Segestria florentina. The pain from a bite can last for hours but, fortunately, their venom has no lasting effect on people.
They are one of the largest spiders in Europe and prey on cockroaches, moths, bees and wasps. Females reach a body length of up to 22mm and males up to 15mm.
Dan said: "My home backs onto woods so I think that must be where they have all come from.
"I saw one that was the size of a tablespoon and I also managed to catch one after I saw it rush across my fence and then jump off onto the ground.
"It was playing dead and my brother said it was only a bit of dirt, but I put a glass over it and moved it a bit and it shot up.
"I let it go and it moved off so quickly it was unbelievable. As I said I'm not scared of spiders but these made me jump!
"I don't really know what I am going to do about them, but I know they bite so I worry about Ruben.
"I will have to speak to the council or get an exterminator out."
Sightings of the spiders have been more common in recent weeks as they usually occur from June to November.