The short version
Most spider jobs in Seattle cost a few hundred dollars. An inspection usually runs $75–$200.
- Inspections usually cost $75–$200.
- Recluse work costs more because it takes more visits.
- Sealing gaps and bug lights cut repeat visits.
- Compare what each quote covers, not just the total.
Anyone in Seattle who's spotted a spider and wants to know if it matters.
What to look for
Spiders follow their food. More insects means more spiders. Most are harmless and even helpful. Seattle is outside the brown recluse range, so most 'recluses' here are look-alikes. Webs and egg sacs keep the cycle going.
- 1Round or teardrop egg sacs tucked into eaves and window frames.
- 2Webs clustered around porch lights and windows.
- 3Spiders wandering across walls at night.
- 4Fresh cobwebs in corners days after cleaning them.
- 5A shiny black spider with a red hourglass underneath.
- 6Spider activity in the garage near the door gap.
Why it’s worth acting soon
- Egg sacs hatch hundreds of spiderlings.
- Webs build up in eaves, corners and garages.
- Widows nest under outdoor furniture and grills.
🧮
Estimate spider control cost in Seattle
Adjust for your situation to see a ballpark range.
Estimated range
A rough guide only. Recluse work and recurring plans cost more.
Treatment options and typical costs
Inspection and Species Identification
$75–$200
The inspection maps webs, entry cracks and what the spiders eat. Everything that follows is built on that map.
- Time
- 45–90 minutes
- Best for
- Every job; the species decides how much to do
Exterior Perimeter Treatment and Void Dusting
$150–$350
Ask what product is used and why it fits your Seattle situation. Labels vary, and the choice should be explained plainly.
- Time
- 45–120 minutes
- Best for
- Heavy exterior activity, widows or recluses confirmed
Monitoring and Follow-Up
$50–$150 per visit
For homes in Seattle where a brown recluse was confirmed, monitoring runs longer, because that species hides deep in stored items and emerges slowly.
- Time
- 20–45 minutes
- Best for
- Confirming results; recluse or widow properties
Sealing Gaps, Lighting and Prey Reduction
$150–$450
Firewood, lumber and dense shrubs by the foundation shelter spiders. Moving them out removes shelter and its insect food supply.
- Time
- 1–4 hours
- Best for
- Long-term reduction; homes near woods, water or fields
Prices are typical published ranges. Ask what’s included before you compare quotes.
Crawl spaces and their vents are worth a look with a flashlight, especially if a widow has turned up outside.What spider control costs in Seattle.
- Sealing Gaps, Lighting and Prey Reduction: $150–$450 - Monitoring and Follow-Up: $50–$150 per visit - Exterior Perimeter Treatment and Void Dusting: $150–$350 - Inspection and Species Identification: $75–$200 - A typical home in Seattle is worth around $850k, and spider work is one of the cheaper pest jobs. Without recluses around Seattle, most jobs are one-time work.
Local spiders conditions in Seattle.
A provider who works Seattle and Washington every day can point out the specific conditions that matter most here, and getting the scope, price, and follow-up terms in writing makes it easier to compare options. Knowing Seattle's seasonal timing lets you schedule treatment before the busy stretch rather than after it, which usually means faster service and a more accurate quote. An inspection in Seattle usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Around Seattle, the area is mostly urban, so spiders pressure can differ from one block to the next depending on how tight the entry points are and how much food, water, or shelter is close by. Seattle sits in a marine west coast climate, and that sets the pace for spider activity here: late summer through fall (August-October).
Dense shrubs, mulch and stone walls close to the house give spiders cover right up to the siding.Which spiders live around Seattle.
Despite their reputation, they aren't considered dangerous. Hobo spiders are common in the Northwest. Most suspects turn out to be harmless look-alikes. Brown recluses don't live around Seattle. Around Seattle, they're western black widows, usually hiding under decks, grills and meter covers. Black widows live in every lower-48 state. All are harmless to people. Most spiders in Seattle homes are house spiders, cellar spiders, jumping spiders and wolf spiders.
When you’ll see more of them.
Clear egg sacs in winter. Spring brings a new hatch. Winter lows around 37°F in Seattle slow spiders outside, but house spiders carry on indoors. That's when males wander. You'll see the most in late summer and fall.
Where they hide in houses here.
Inside, check closets and corners. Check crawl vents, the crawl door and the undersides of porches. Many houses around Seattle have crawl spaces, and cellar spiders and widows love them.
A year of spiders in Seattle.
- Winter: with lows near 37°F in Seattle, a good time to clear clutter and seal gaps. - Fall: males wander indoors. Peak spider season. - Summer: highs near 76°F in Seattle bring more insects, and more spiders. - Spring: new spiderlings hatch. Vacuum webs and egg sacs.
Harmless or worth a closer look?
- Orb weaver: big round web outside. Harmless. - Jumping spider: small, fuzzy, hops. Harmless. - Cellar spider: tiny body, very long legs. Harmless. - Wolf spider: big, hairy and fast. Harmless. - Brown recluse: tan, violin mark on its back, plain legs. - Black widow: shiny black, red hourglass underneath. Leave it alone.
If you think you’ve been bitten.
If you can, safely catch the spider for identification. See a doctor for severe pain, cramping or spreading redness. Raise the area if you can. Use a cool compress. Wash the bite with soap and water.
Fewer spiders, the easy way.
- Beds: keep them a few inches from the wall. - Shoes and gloves: shake them out before use. - Webs: vacuum webs and egg sacs every few weeks. - Clutter: store things in sealed plastic bins, not cardboard. - Gaps: add door sweeps and repair screens. - Lights: yellow bug lights draw fewer insects.
Webs outside: leave some, clear some.
- Gloves: wear them when moving firewood, pots or patio cushions. - Woodpiles: keep them off the ground and away from the house. - Eaves and window frames: a long-handled brush works well. - Doorways and porch lights: brush webs away weekly. - Garden orb weavers: leave them. They catch flies and mosquitoes.
Spider myths.
- Every blister is a recluse bite: most aren’t spider bites. - Spiders move in for winter: most house spiders never leave. - Daddy longlegs are deadly: no. They’re harmless. - Swallowing spiders in your sleep: no evidence it happens.
Spiders and pets.
Ask the company which products are cat-safe. Some sprays are risky for cats. your vet. A widow bite can sicken a dog or cat. Most spiders are no threat to pets.
What a spider visit looks like.
Inside, they focus on corners, closets and the garage. They treat cracks, gaps and hiding spots, not open lawn. They knock down webs and egg sacs around eaves and windows. The tech walks the outside first. Most visits take about an hour.
Sticky traps tell you a lot.
They show which spiders you have and where they travel. Check them after a week. Set sticky traps along baseboards, behind furniture and in the garage.
Outdoor lights and spiders.
Motion-sensor lights help too. Yellow bulbs attract fewer bugs. Porch lights draw insects, and insects draw spiders.
Cellar spiders in the basement.
A dehumidifier and a broom keep them in check. They're harmless and even eat other spiders. Long-legged cellar spiders hang in basement corners.
Spiders in the garage.
A door sweep and a sticky trap by the door help. Store things in sealed bins off the floor. Garages collect webs, boxes and insects.
Questions to ask before you sign.
- When can kids and pets go back in? - What happens if they come back? - Will you seal gaps or add door sweeps? - Is web and egg-sac removal included? - Where will you treat, inside and out? - Which spiders did you find?
Ways to keep the cost down.
- Compare what each quote covers. - Ask whether a one-time visit is enough. - Clear clutter before the visit. - Switch to yellow bug lights. - Vacuum webs and egg sacs yourself.
What affects the price
- Season and how heavy current activity is.
- Door sweeps, screens and sealing work.
- Bundling with an existing general pest plan.
- Wooded, wet or open-field surroundings.
- Amount of clutter in garage, basement and storage.
- One-time visit versus recurring plan.
- Eave depth and roofline height.
- Inclusion of web and egg-sac removal.
📊
What's your biggest concern about spider control costs?
When to call for help
if spiders keep coming back after cleaning. High eaves and attics are worth leaving to a pro. Call if a black widow is near where kids play.
What you can do yourself
Start simple. Add door sweeps and store things in sealed bins. Skip foggers. They don't reach hiding spots. A pro adds targeted treatment in cracks and voids.
Spiders in Seattle
With about 38 inches of rain a year and humidity near 73%, Seattle supports plenty of insects, and spiders follow them. In denser parts of Seattle, spiders favor stairwells, garages, basements and window frames. Seattle has a marine west coast climate, and spiders activity here tends to follow late summer through fall (August-October). An inspection in Seattle that starts outside and works inward usually finds the entry points, moisture, and shelter that matter most before anyone treats.
Local research
Spiders in Seattle, WA: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Washington, when they are busiest around Seattle, and what the state figures look like. Everything below links to the agency or university page it came from.
Spider species recorded in Washington
- Western black widow (Latrodectus hesperus) — 'The black widow spider, Latrodectus hesperus, is the most common harmful spider in California' and 'occur in most parts of California' (UC IPM); 'common in Colorado' (CSU); Lat…
- Hobo spider (Eratigena agrestis) — European funnel weaver 'detected in the Pacific Northwest in 1936', now 'throughout northern Utah' and 'throughout Washington'. Current extension/health stance: not medically si…
- Yellow sac spider (Cheiracanthium spp.) — 'Can be seen running on walls and ceilings at night'; bites happen when 'trapped against a person's skin in clothing or bedding' (UC IPM). One of two spiders of medical signific…
When spiders are busiest around Seattle
'When temperatures start to cool, spiders may migrate into garages and homes in search of warmth and shelter' (WA DOH).
'There are two spiders in Washington of medical significance: the black widow spider' and the yellow sac spider; 'Hobo spiders (Eratigena agrestis) are not considered dangerous as previously thought' and 'can be found throughout Washington' (WA DOH). Black widows 'common to eastern Washington'; yellow sac spiders 'in eastern Washington and in the Seattle area'.
For context, nationally
- Throughout North America, but are most common in the southern and western United States — Black widow distribution. CDC/NIOSH
- In the midwestern and southern United States — Brown recluse distribution. CDC/NIOSH
Sources: CDC/NIOSH; Pest Notes: Spiders (PN 7442); Hobo Spider. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep spiders away
- Run a dehumidifier in damp basements.
- Repair torn window and vent screens.
- Keep beds a few inches from the wall.
- Install door sweeps on every exterior door.
- Seal gaps around pipes, cables and vents.
- Put exterior lights on motion sensors.
Compare quotes on what they include: web removal, treatment, sealing and any follow-up visit.Did you know?
Wolf spider mothers carry hundreds of spiderlings on their backs
Weight for weight, spider silk is stronger than steel.
Questions people ask
Why is brown recluse treatment more expensive?
Recluses hide in stored items and wall voids. Treatment takes more visits, traps and careful dusting.
Is the inspection fee credited toward treatment?
Sometimes. Some companies credit it if you go ahead. Ask before you book.
Does home size change the price?
Yes. Bigger homes have more walls, eaves and storage to treat.
What should a spider control quote include?
Which spiders they found, what they'll treat, and how often. It should say what happens if spiders return.
Do brown recluses live in my area?
Probably not. Washington is outside the brown recluse range.
How do I know if I have a black widow?
Look for a shiny black spider with a red hourglass underneath. They hide under furniture, grills and meter covers. Don't handle it.
What does a professional spider treatment involve?
An inspection to identify the spiders first. Then they remove webs and egg sacs and seal gaps. Last comes a targeted treatment in cracks and voids.
How much is quarterly pest control for spiders?
Local quotes vary; ask for a written estimate. A good pro in Seattle will explain how their plan fits what they found at your home.
What is the most common spider found inside homes?
Around Seattle, if the spiders in your corners have thin bodies and very long legs, they are probably cellar spiders: Bertone and colleagues found them in 84% of 50 North Carolina homes in 2012, a presence finding from a small regional sample. Around Seattle, ask up front how many visits you get and what happens if spiders return.
Are there dangerous spiders in Seattle?
Black widows, yes, as almost everywhere. Most other spiders here are harmless.
When are spiders worst in Seattle?
Late summer and fall, when males wander.
Nearby cities
Related guides
Sources (12)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Spider Exterminator · Updated September 11, 2026 · How we write these guides