Spider control in BC is one of the most common pest requests we receive, particularly in late summer and autumn when spiders enter homes in large numbers. While most BC house spiders are harmless, a significant infestation is unwelcome — and in some cases, dangerous species like black widows require immediate professional spider control. This guide covers everything BC homeowners need to know.
Spider Control: Common Species in BC
Giant House Spider
The giant house spider (Eratigena atrica) is the most common species requiring spider control in BC homes. Large, fast-moving, and brown, they enter in autumn seeking mates and warmth. They are harmless but alarming due to their size. Males wander actively in August and September — this is when most spider control calls peak.
Black Widow Spider
Black widow spiders (Latrodectus hesperus) are present in some BC areas, particularly in the southern Interior and occasionally in the Lower Mainland. Glossy black with a red hourglass marking on the abdomen, black widows require immediate professional spider control — their venom causes serious medical symptoms and bites require hospital treatment.
Yellow Sac Spider
Yellow sac spiders are small, pale yellow, and active hunters found in BC homes year-round. Their bite can cause mild local reaction in sensitive individuals. They are one of the more commonly encountered spiders requiring spider control in BC bedrooms and living areas.
Cellar Spider
Cellar spiders (daddy long-legs) are long-legged, pale, and found in basements and undisturbed corners. Completely harmless but often found in large numbers in damp basements — a sign of both high insect activity and moisture issues that professional spider control can address.
Why Are There So Many Spiders in Your BC Home?
Spiders don’t enter homes searching for food directly — they follow their prey. A significant spider infestation almost always indicates a healthy population of the insects they feed on. Effective spider control often means addressing the underlying insect problem, not just treating the spiders themselves.
Spider numbers peak in BC in August and September as males of several species go on the move looking for mates — this is the most common time for spider control calls.
Effective Spider Control Methods
1. Seal Entry Points
The most effective long-term spider control is preventing entry. Seal gaps around windows, doors, pipes, and cables. Check and replace damaged screens. Install door sweeps on exterior doors. This reduces the number of spiders getting inside significantly.
2. Remove Webs and Egg Sacs
Remove spider webs regularly using a vacuum. Pay attention to corners, ceiling edges, behind furniture, and in storage areas. Remove egg sacs immediately — a single egg sac can contain hundreds of spiderlings.
3. Reduce Outdoor Lighting
Exterior lights attract insects, which attract spiders. Switching to yellow bug lights or motion-activated lighting reduces the insect activity near entry points that draws spiders to your doors and windows.
4. Professional Residual Spray Treatment
Professional spider control uses residual insecticide spray applied around the exterior perimeter and interior entry points. This creates a contact zone that kills spiders and other insects moving through treated areas — significantly more effective than consumer spider sprays, which have much shorter residual activity.
Spider Control Price Guide
| Service | Typical Price Range |
|---|---|
| Interior spider control treatment | $150 – $250 |
| Exterior perimeter spray | $150 – $300 |
| Full interior + exterior treatment | $250 – $450 |
| Black widow removal | $200 – $350 |
When to Call a Professional for Spider Control
- You suspect black widow spiders — call immediately
- Spider numbers are very high and increasing despite DIY measures
- You’re finding large numbers of egg sacs in wall voids or insulation
- Spiders keep returning after cleaning and sealing
According to Health Canada, black widow spider bites are a medical emergency requiring immediate treatment. Never handle suspected black widows without professional spider control assistance.
Professional Spider Control in Surrey and the Lower Mainland
Top Line Pest Control provides professional spider control across Surrey, Langley, Coquitlam, Abbotsford, and the Lower Mainland. We identify the species, apply targeted residual treatment, and advise on prevention. Also see our guide on how to get rid of spiders in your home.
📞 Call (604) 551-6504 for same-day spider control across BC.