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Why Do Spiders Build Webs Near Lights?

Written by PestMan Editorial TeamTechnical review pendingPublished Updated

Quick answer

Spiders build webs near lights because lights attract flying insects at night, giving web-builders a reliable meal. Outdoor lights on patios, verandahs and above doors can become spider hotspots within days. Changing the type or placement of lighting reduces insects, which in turn reduces spiders.

Why this happens

Many night-flying insects are attracted to light, especially bright white and blue-rich light. Spiders exploit this concentration of prey.

Lights are often mounted under eaves or on walls, which also provide shelter and anchor points.

What you can do

  • Switch off outdoor lights when not needed, or use motion sensors.
  • Use warm-coloured or yellow bug lights that attract fewer insects.
  • Position lights away from doors so insects are drawn away from entries.
  • Remove webs regularly.

When professional help may be needed

Professional spider treatments can reduce web-building around eaves and lights but are temporary without also reducing insect attraction.

Spiders

Eight-legged predators that feed on insects. Most household spiders are harmless and useful, but a few Australian species, such as redbacks and funnel-webs, need to be treated with care.

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Sources & further reading

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