Updated: July 6, 2025

Cellar spiders, also commonly known as daddy longlegs, are a frequent sight in many homes, particularly in dark, damp areas like basements, cellars, and crawl spaces. While they are generally harmless and even beneficial in controlling other insect populations, their presence can be unsettling for many homeowners. This raises a common question: do professional exterminators handle cellar spider issues? The short answer is yes—professional pest control experts do address cellar spider infestations, but the approach and necessity may vary depending on the situation. In this article, we will explore what cellar spiders are, why they appear in your home, the implications of having them around, and how professional exterminators manage these arachnid visitors.

Understanding Cellar Spiders

Cellar spiders belong to the family Pholcidae and are characterized by their long, thin legs and small bodies. They get their name from their preferred habitats—dark, cool, and damp environments such as cellars, basements, and garages. These spiders spin messy, irregular webs that often appear in corners or along ceilings.

Despite rumors that cellar spiders are among the most venomous spiders but have fangs too short to bite humans—which is false—they pose little to no threat to people. Their venom is not harmful to humans, and their tiny fangs rarely penetrate human skin. Instead of being a danger, cellar spiders can be considered beneficial since they prey on other nuisance insects and even other spiders.

Why Do Cellar Spiders Invade Homes?

There are several reasons why cellar spiders might establish themselves inside your home:

  • Environmental Conditions: They thrive in areas with high humidity and low light. Basements and cellars often provide these ideal conditions.
  • Food Availability: These spiders feed on other insects. If your home has other pests like flies, mosquitoes, or other smaller spiders, cellar spiders may move in to hunt.
  • Shelter: The quiet undisturbed areas of a house provide safe havens for them to build webs and reproduce.
  • Seasonal Changes: Cooler weather outdoors can drive cellar spiders indoors seeking warmth.

While they usually prefer isolated spots away from human activity, large populations can result in visible webs and some discomfort for residents.

Should You Be Concerned About Cellar Spiders?

For most people, cellar spiders are more of a nuisance than a threat. Here’s why:

  • Non-aggressive Behavior: They tend to avoid humans and bite only if provoked.
  • No Significant Health Risk: Their venom is not medically significant.
  • Natural Pest Control: They help reduce populations of other pests.

However, some may want them removed due to phobias or simply because of their unsightly webs. Additionally, in rare cases where there’s an overwhelming infestation indicating other pest problems or structural moisture issues attracting them, intervention may be necessary.

Do Professional Exterminators Handle Cellar Spider Issues?

Yes—They Absolutely Can

Professional exterminators are equipped to address all types of pest issues—including cellar spider infestations. When called upon for spider problems, pest control specialists will assess the extent of the infestation as well as underlying causes such as moisture problems or secondary pest infestations.

What Does Treatment Involve?

  1. Inspection and Identification

The initial step involves a thorough inspection of affected areas like basements, attics, crawl spaces, and dark corners around the home. Professionals determine whether the problem is limited to cellar spiders or if other pests are attracting them.

  1. Sanitation and Habitat Modification

Since cellar spiders thrive in dark and damp environments filled with insect prey, professionals often recommend steps like reducing moisture (using dehumidifiers), sealing cracks and entry points, repairing leaks, improving ventilation, and cleaning up cluttered storage spaces.

  1. Pest Control Treatments

When necessary, exterminators employ targeted treatments such as:
Residual insecticides applied along baseboards, cracks, and crevices.
Web removal to physically eliminate spider webs.
Insect baiting or insecticide applications to reduce populations of prey insects which indirectly reduces spider numbers.

  1. Monitoring

Follow-up visits may be scheduled to monitor progress and reapply treatments if required.

Integrated Pest Management (IPM) Approach

Most reputable pest control companies use an IPM approach focusing on long-term prevention through environmental changes rather than solely relying on chemical treatments. This approach minimizes pesticide use while effectively controlling spider populations.

When Should You Call a Professional?

Not every sighting of a cellar spider warrants professional intervention. These spiders naturally inhabit many homes without causing harm. However, you should consider calling an exterminator if:

  • You notice large numbers of cellar spiders consistently appearing despite regular cleaning.
  • You observe extensive webbing making living areas unsightly or unusable.
  • There is evidence of underlying insect infestations attracting the spiders.
  • Moisture problems or structural issues exist contributing to favorable habitats for these pests.
  • You have a severe arachnophobia making self-treatment difficult or stressful.

In these cases, professional help ensures safe and effective control while identifying root causes that need correction.

DIY Methods vs Professional Services

DIY Control Options

If you have a minor problem or just want general prevention tips before considering professional help:

  • Regularly vacuum webs and remove egg sacs.
  • Reduce humidity levels using dehumidifiers or ventilation fans.
  • Seal entry points such as cracks around windows and doors.
  • Remove clutter that provides hiding places.
  • Use over-the-counter insecticides designed for indoor spider control carefully following label instructions.

Limitations of DIY Methods

While these methods can reduce minor populations temporarily, they might not provide lasting results if underlying conditions remain unchanged or infestations are large. Misusing pesticides can also pose health risks to residents and pets.

Advantages of Hiring Professionals

  • Expert knowledge about spider biology and behavior ensures effective targeting.
  • Access to specialized products not available to consumers.
  • Comprehensive inspection identifies underlying problems beyond just visible spiders.
  • Customized treatment plans tailored to your home’s unique environment.
  • Safety protocols minimize risks associated with chemical use.

Conclusion

Professional exterminators do handle cellar spider issues effectively when needed. While these arachnids are generally harmless and even helpful in managing other pests around your home’s basement or cellar areas, unwanted infestations can become bothersome or indicate larger problems that require expert intervention. Professionals offer thorough inspections along with tailored treatment options focusing on both immediate control and long-term prevention by addressing moisture problems and eliminating food sources.

For minor appearances of cellar spiders that don’t cause distress or structural issues, simple DIY methods like regular cleaning and environmental adjustments may suffice. However, when large populations persist despite efforts or underlying conditions favor ongoing infestations, consulting a licensed pest control company ensures safe removal coupled with advice on preventing future problems.

By understanding the nature of cellar spiders and recognizing when professional help is appropriate, homeowners can maintain healthy living spaces free from unwanted pests while preserving beneficial natural predators when possible.

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