Spider Season in London & Essex: Six Common Spiders You’ll Spot This Autumn

When the nights grow longer and the heating clicks back on, we’re not the only ones seeking warmth indoors. Autumn marks the start of spider season across London and Essex — that familiar time of year when you might spot a few more eight-legged visitors scuttling across the floor or hiding in a cosy corner.

But don’t panic. Most common UK spiders are harmless, fascinating, and even helpful around the home. In this Bugwise Pest Control guide, we’ll walk you through the six most common spiders you’ll find indoors this season, how to tell them apart, and when to call in a professional if your “one or two” becomes a full-on infestation.

Why Do Spiders Come Indoors in Autumn?

As outdoor temperatures drop, spiders — particularly males — head indoors in search of a mate. It’s not that your home is attracting them; it’s simply warmer, drier, and safer.

According to arachnologists, autumn spider season in the UK typically runs from early September through mid-October, though mild winters can stretch it into November.

And for those wondering whether these autumn visitors pose a risk: the short answer is no. The UK’s native spiders rarely bite, and almost none can pierce human skin.

👉 For a deeper dive into this topic, read our detailed guide: Why Are There So Many Spiders in Autumn?

1. Daddy Longlegs (Crane Fly)

Despite their spindly limbs, daddy longlegs aren’t spiders at all — they’re actually crane flies. These harmless insects often flutter clumsily indoors in late summer and early autumn, drawn by artificial light.

They don’t bite, sting, or feed indoors; they simply get confused and try to fly toward light sources. If one ends up in your living room, just guide it gently outside.

Their unpredictable, wobbly flight might look alarming, but these “daddy longlegs” are entirely harmless.

2. Cellar Spider (a.k.a. Daddy Longlegs Spider)

Now here’s where things get tricky — the cellar spider (Pholcus phalangioides) is a true spider, and it often gets mistaken for the flying crane fly.

Long-legged and pale, the cellar spider loves quiet, undisturbed corners — cellars, garages, ceilings, and stairwells are their favourite haunts. They spin loose, wispy webs and hang upside-down to wait for prey like small flies or other spiders.

If disturbed, they’ll shake violently in their web to scare off predators (including you). Despite their spooky look, they’re useful pest controllers in their own right, catching more troublesome insects before they bother you.

3. Harvestman (Opiliones)

Another arachnid look-alike, harvestmen are not true spiders either, but they’re close cousins. You’ll recognise them by their incredibly thin legs and single round body — unlike true spiders, their head and abdomen are fused together.

Harvestmen don’t spin webs and they’re not venomous. Instead, they scavenge — feeding on insects, fruit, and even fungi. You’ll often spot them in gardens and around windowsills, especially after rainfall.

Although they might wander indoors, they rarely settle there, preferring damp, cool areas outside.

4. Zebra Jumping Spider

Meet the most acrobatic spider in Britain — the zebra jumping spider (Salticus scenicus). Tiny, compact, and black-and-white striped like its namesake, it’s often found on sunny windowsills, walls, or ceilings.

Rather than spinning webs, zebra jumpers rely on powerful legs and precision leaps to pounce on prey. They can jump more than 14 times their body length — that’s the human equivalent of leaping over a double-decker bus!

They’re curious too. If you’ve ever noticed a small spider tilting its head as if watching you — that’s a zebra jumper checking you out with its incredible 3D vision.

5. Giant House Spider

The name alone might make your skin crawl, but the giant house spider (Eratigena duellica) is a harmless house guest — albeit a fast one.

With bodies up to 18mm long and legs stretching over 7cm, these are the large brown spiders you’ll often see sprinting across your carpet in September. They move fast (half a metre per second!) and can look intimidating, but they’re not dangerous.

They help control flies, silverfish, and other small pests around your home. If you find one trapped in your bathtub, offer a tissue or cardboard escape route rather than a boot — they’ll happily make their way back outside.

6. Orb Weaver (Garden Spider)

If you’ve ever noticed a perfect spiral web sparkling with dew in the garden or between fence panels, you’ve probably met an orb weaver — specifically the European garden spider (Araneus diadematus).

These outdoor masters of engineering spin beautifully symmetrical webs each morning, waiting patiently in the centre for vibrations from trapped prey.

They’re instantly recognisable by the white cross pattern on their backs and round, bulbous bodies. Though mainly outdoor spiders, a few may wander indoors as temperatures fall.

If you’re lucky enough to see one at work, take a moment to admire its craftsmanship before gently relocating it outside.

How to Prevent Spiders from Taking Over

While it’s nearly impossible to keep spiders out completely, you can reduce their numbers with a few practical steps:

1. Seal entry points – Close small gaps around windows, vents, and pipework.
2. Reduce clutter – Cardboard boxes and piles of clothes make ideal spider hideouts.
3. Keep lighting low at night – Outdoor lights attract flying insects, which attract spiders.
4. Vacuum regularly – Remove webs and egg sacs before they hatch.
5. Avoid harsh chemicals – Instead of DIY sprays, use professional-grade insecticides safely applied by trained technicians.

If spiders are persistent or breeding indoors, a targeted professional treatment is the most effective solution. Our Bugwise team uses BPCA-approved insecticides and preventative proofing for long-term results.

For full details, visit our Spider Control page.

Final Thoughts

Spiders might not be everyone’s favourite autumn visitor, but they play an important role in keeping the insect population in check.

If you’re seeing more spiders than you’d like — or noticing webs in every corner — Bugwise Spider Control can help restore balance. From harmless house spiders to recurring infestations, our technicians deliver fast, discreet, and humane treatments that keep your property pest-free year-round.