Mostly harmless, but webs make a property look neglected and their presence usually points to another insect problem.
Web-building species settle wherever prey is passing — near lights that attract flying insects, in undisturbed corners and around eaves. Their numbers track the availability of other insects more than anything else.
Most species are harmless to people and some are beneficial. The practical issues are appearance and, occasionally, bites from species that will defend themselves if trapped against skin.
Physical removal of webs and egg sacs, residual treatment of corners, eaves and voids where they settle, and reducing the insects they feed on — which is usually what keeps numbers down long term.
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