How Much Is Pest Control in Seattle? (2026 Prices)
Last updated: March 18, 2026
Pest control in Seattle costs $95 to $550 for a one-time visit, with the average homeowner paying about $170. The Seattle metro area (4 million people) has a pest profile shaped by the Pacific Northwest's wet climate, dense tree canopy, and older housing stock. Carpenter ants, moisture ants, rats, and yellow jacket wasps are the most persistent pest challenges for Seattle homeowners.
- Seattle pest control costs $95 to $550, with an average of $170 per visit
- Carpenter ants are the top structural pest in the Pacific Northwest
- Moisture from rain and fog drives year-round pest pressure
- Roof rats thrive in Seattle's dense vegetation and mature trees
- Pacific Northwest has minimal mosquito and termite pressure compared to southern cities
This guide covers local pricing for the most common Seattle-area pests, seasonal patterns, and tips for choosing a pest control company in the metro. For national pricing benchmarks, see our pest control cost guide.
Seattle Pest Control Pricing by Service
| Service | Seattle Price | National Average |
|---|---|---|
| One-time general treatment | $95 – $550 | $100 – $600 |
| Quarterly plan (per visit) | $100 – $225 | $100 – $300 |
| Monthly plan (per visit) | $40 – $65 | $40 – $70 |
| Carpenter ant treatment | $200 – $500 | $150 – $300 |
| Rat/mouse removal | $225 – $650 | $200 – $600 |
| Dampwood termite treatment | $800 – $2,500 | $1,200 – $3,500 |
| Wasp/yellow jacket removal | $100 – $400 | $100 – $400 |
| Moisture ant treatment | $150 – $350 | $150 – $300 |
| Mosquito control | $125 – $300 | $150 – $350 |
| Wildlife removal (raccoons, squirrels) | $250 – $700 | $200 – $600 |
Seattle pest control pricing is slightly below national averages for general treatments. However, carpenter ant work runs higher than national benchmarks because of the severity and frequency of infestations in the Pacific Northwest. Wildlife removal also skews above average due to the prevalence of raccoons and squirrels in Seattle's tree-heavy neighborhoods.
Common Seattle Pests and Treatment Costs
Carpenter ants ($200 to $500)
Carpenter ants are the number one structural pest in the Pacific Northwest, and moisture ants pose an additional structural threat in homes with water-damaged wood. Seattle's wet climate creates ideal conditions: rain-saturated wood around rooflines, window frames, and crawl spaces gives carpenter ants the moisture-damaged material they need for nesting. They do not eat wood but excavate smooth galleries inside it, leaving behind piles of fine sawdust called frass. For a detailed look at ant species affecting Seattle homes, see our Seattle ant infestation guide.
Large black carpenter ants foraging indoors during spring and summer are the first sign of a colony. Mature colonies can contain 10,000 or more workers, and satellite colonies inside the home are often connected to a parent colony in a nearby tree or stump. Treatment costs $200 to $500 and involves locating the colony, applying residual insecticide, and addressing the moisture source. See our ant exterminator cost guide for more detail.
Rats and mice ($225 to $650)
Norway rats are a major problem in older Seattle neighborhoods like Capitol Hill, Ballard, Fremont, and the University District. They burrow along foundations, under decks, and in alley spaces near dumpsters and compost bins. Roof rats are more common in newer suburban areas and in neighborhoods with heavy tree cover. Mice enter homes through gaps as small as a quarter inch, particularly during fall and winter rains.
Removal costs $225 to $650 depending on severity. Effective control requires trapping, exclusion (sealing entry points with steel mesh and concrete), and removing food sources like unsecured garbage and bird feeders. Seattle's composting requirements can attract rats if bins are not properly sealed. Full-home exclusion work can cost $500 to $2,000 but provides the longest-lasting protection. See our rodent exterminator cost guide.
Moisture ants ($150 to $350)
Moisture ants are a pest unique to the Pacific Northwest's wet climate. They nest in wood that is already decaying from water damage, often in crawl spaces, bathroom walls, and around leaky plumbing. Their presence is a reliable indicator of an underlying moisture problem that needs to be addressed alongside the pest treatment.
Treatment costs $150 to $350 and typically involves treating the colony, replacing damaged wood, and fixing the moisture source. Ignoring moisture ants can lead to progressive structural damage as the decaying wood they inhabit continues to deteriorate. Many pest control companies in Seattle offer combined moisture ant and crawl space moisture assessments.
Yellow jacket wasps ($100 to $400)
Yellow jackets are the most aggressive stinging insect in the Seattle area. They build nests in the ground, inside wall voids, under eaves, and in attic spaces. Colonies grow throughout the summer and peak in August and September, when workers become highly aggressive around food sources at outdoor gatherings. Ground nests in yards are a particular hazard for children and pets.
Removal costs $100 to $400 depending on nest location and accessibility. Wall void nests are more expensive to treat because they require drilling and injecting insecticide into the cavity. Nests should be treated by a professional, as yellow jackets can sting repeatedly and will swarm when disturbed. See our wasp nest removal cost guide.
Dampwood termites ($800 to $2,500)
Dampwood termites are present in the Seattle area but are less destructive than the subterranean termites common in southern states. They infest wood with high moisture content, typically around leaky roofs, plumbing failures, and ground-contact wood. Unlike subterranean termites, they do not build mud tubes and live entirely within the wood they consume.
Treatment costs $800 to $2,500 and focuses on removing the moisture source, replacing damaged wood, and applying localized treatment. Because dampwood termites require consistently wet wood, fixing the underlying moisture problem is often the most important step. Full-home fumigation is rarely necessary for dampwood termite infestations.
Wildlife: raccoons and squirrels ($250 to $700)
Raccoons and squirrels frequently get into attics across Seattle's residential neighborhoods. The city's mature tree canopy provides easy roof access, and older homes often have vulnerable soffits, fascia, and roof vents. Raccoons are strong enough to tear open damaged roofing material, while squirrels chew through wood and plastic vents. Both species create noise, odor, and potential electrical hazards from gnawing on wires.
Removal costs $250 to $700 depending on species and accessibility. Washington state requires wildlife to be handled by licensed wildlife control operators. Exclusion work after removal is essential to prevent re-entry. Spring and fall are the peak seasons, as animals seek shelter for birthing and overwintering. See our wildlife removal cost guide.
Seattle Seasonal Pest Calendar
| Season | Months | Peak Pests | Notes |
|---|---|---|---|
| Spring | Mar – May | Carpenter ants, moisture ants, rats, wasps | Carpenter ants emerge as temperatures rise above 50F. Wasp queens start building new nests. Rats active after winter. |
| Summer | Jun – Aug | Yellow jackets, carpenter ants, spiders, mosquitoes | Yellow jacket colonies peak in Aug. Giant house spiders appear indoors. Mosquitoes active near standing water. |
| Fall | Sep – Nov | Rodents, stink bugs, box elder bugs, raccoons | Rats and mice move indoors with fall rains. Stink bugs and box elder bugs cluster on sunny walls seeking entry. Raccoons and squirrels seek attic shelter. |
| Winter | Dec – Feb | Rodents, moisture ants, spiders | Heavy rain drives rodents indoors. Moisture ants remain active in damp crawl spaces. Giant house spiders shelter indoors. |
Cost Factors in Seattle
- Age of home. Older homes in neighborhoods like Capitol Hill, Wallingford, and Ballard have more entry points for rodents and more moisture-vulnerable wood for carpenter ants. Crawl spaces in pre-1970 homes often lack modern vapor barriers.
- Proximity to water and greenbelts. Homes near Lake Washington, the Ship Canal, Puget Sound shoreline, or city greenbelts face higher pest pressure from rats, raccoons, and moisture-loving insects.
- Moisture issues. Seattle's rainfall means that crawl space moisture, gutter failures, and roof leaks directly increase the risk of carpenter ants, moisture ants, and dampwood termites. Addressing moisture problems reduces long-term pest control costs.
- Crawl space condition. Many Seattle homes have crawl space foundations. Standing water, inadequate vapor barriers, and poor ventilation in crawl spaces create ideal conditions for moisture ants, carpenter ants, and rodent harborage.
- Urban density. Dense neighborhoods with attached housing, narrow lots, and shared fences create corridors for rat movement. Proximity to restaurants, dumpsters, and compost collection increases rodent pressure.
How Much Does Carpenter Ant Treatment Specifically Cost in Seattle?
Carpenter ants are the number one structural pest in the Pacific Northwest, causing more structural damage in the Seattle area than termites do. A detailed breakdown of carpenter ant treatment costs helps homeowners understand what they are paying for and why treatment costs more in Seattle than the national average.
| Carpenter Ant Service | Seattle Cost | Notes |
|---|---|---|
| Single satellite colony treatment | $200 – $350 | Treats one colony in an accessible wall void or window frame |
| Multi-colony treatment (parent + satellites) | $350 – $500 | Locates and treats connected colonies inside the home and nearby trees |
| Full-home carpenter ant treatment with perimeter | $400 – $700 | Comprehensive treatment including wall void injection, perimeter spray, and crawl space |
| Annual carpenter ant prevention plan | $300 – $600 per year | Quarterly treatments focused on carpenter ant prevention and early detection |
| Crawl space treatment (carpenter ants + moisture ants) | $200 – $450 | Treats colonies nesting in moisture-damaged crawl space timbers |
The reason carpenter ant treatment costs more in Seattle ($200 to $700) than the national average ($150 to $300) is that infestations in the Pacific Northwest tend to be larger and more complex. Parent colonies in nearby trees or stumps send satellite colonies into the home through multiple pathways. A technician may need to locate and treat three or four connected nesting sites, inject insecticide into wall voids, treat the crawl space, and apply perimeter barriers, all in a single visit.
Effective carpenter ant treatment in Seattle also requires addressing the moisture source that attracted the colony in the first place. Leaky roofs, gutter failures, ice dam damage, and inadequate crawl space ventilation all create the damp wood conditions that carpenter ants need. Treatment without moisture correction is a temporary fix. For more on carpenter ant identification and treatment, see our ant exterminator cost guide and our Seattle ant infestation guide.
What Are Moisture Ants and How Much Does Treatment Cost?
Moisture ants are a pest largely unique to the Pacific Northwest. They are small, yellowish-brown ants that nest exclusively in wood that is already decaying from water damage. Unlike carpenter ants, which excavate healthy or slightly softened wood, moisture ants colonize wood that has progressed to active rot. Their presence is a reliable indicator that a more serious moisture and structural problem exists behind the wall or under the floor.
Treatment costs $150 to $350 for the pest treatment itself, but the total remediation cost is usually higher because it involves repairing the moisture source and replacing the damaged wood. A moisture ant infestation in a bathroom wall might cost $150 to $350 for pest treatment plus $500 to $2,000 for plumbing repair and wall reconstruction. In a crawl space, treatment may cost $200 to $450 for the ants plus $2,000 to $5,000 for crawl space moisture mitigation (vapor barrier installation, ventilation improvement, or encapsulation).
Moisture ants are most commonly found in bathrooms, kitchens, laundry rooms, and crawl spaces, any area where plumbing leaks, condensation, or poor ventilation create sustained moisture in wood framing. If you see small yellowish ants near a wall or floor and the surrounding wood feels soft or spongy, moisture ants and water damage are the likely culprits. A pest control company experienced with Pacific Northwest pests will inspect for the moisture source alongside the ant colony.
How Much Does Each Treatment Method Cost in Seattle?
| Treatment Method | Seattle Cost Range | Best For |
|---|---|---|
| Exterior perimeter spray | $95 – $175 | General insects, ants, spiders, earwigs |
| Wall void injection (dust or liquid) | $150 – $400 | Carpenter ants, moisture ants, wasps in wall voids |
| Crawl space treatment | $200 – $450 | Carpenter ants, moisture ants, rodents, dampwood termites |
| Dampwood termite localized treatment | $800 – $2,500 | Dampwood termites in moisture-damaged wood |
| Rodent trapping program | $225 – $650 | Norway rats, roof rats, mice |
| Full-home rodent exclusion | $500 – $2,000 | Sealing all rodent entry points with steel mesh and concrete |
| Yellow jacket nest removal | $100 – $400 | Ground nests, wall void nests, eave nests |
| Wildlife exclusion (raccoons, squirrels) | $250 – $700 | Trapping, removal, and sealing of roof-level entry points |
| Stink bug/box elder bug perimeter treatment | $100 – $225 | Fall invaders seeking winter shelter |
The common thread in Seattle pest control is moisture. Nearly every major pest problem in the region, from carpenter ants and moisture ants to dampwood termites and rodents in crawl spaces, is connected to excessive moisture in and around the home. Companies that assess moisture conditions as part of their inspection provide better long-term results than those that focus solely on chemical treatment.
Should You DIY or Hire a Professional in Seattle?
| Pest | DIY Cost | Professional Cost | Recommendation |
|---|---|---|---|
| Carpenter ants | $15 – $40 (baits, perimeter spray) | $200 – $700 | Professional strongly recommended. Carpenter ant colonies nest inside walls and structural timbers where DIY products cannot reach. Treatment requires locating the colony, not just killing foraging workers. |
| Moisture ants | $10 – $25 (sprays) | $150 – $350 | Professional recommended. Moisture ants indicate water damage that needs professional assessment alongside the pest treatment. |
| Rats | $25 – $60 (snap traps) | $225 – $650 | Professional recommended for anything beyond one or two mice. Norway rats in older Seattle neighborhoods require professional trapping and exclusion. Poison bait is restricted in many Seattle-area jurisdictions. |
| Yellow jackets | $10 – $25 (spray can) | $100 – $400 | DIY is feasible for small, visible, accessible nests. Ground nests and wall void nests should be treated professionally due to the risk of aggressive swarming. |
| Dampwood termites | Not recommended | $800 – $2,500 | Always hire a professional. Treatment involves removing moisture-damaged wood and eliminating the moisture source, which requires structural assessment. |
| Spiders (giant house spiders) | $10 – $20 (glue traps, spray) | $95 – $175 | DIY is effective for giant house spiders. They are non-venomous and mostly a nuisance. Glue traps in basements and garages capture most of them. |
| Stink bugs / box elder bugs | $10 – $25 (perimeter spray) | $100 – $225 | DIY perimeter treatment in early September can be effective. Professional treatment provides more thorough coverage for homes with heavy annual invasions. |
For most Seattle homeowners, quarterly professional service ($100 to $225 per visit) provides the best balance of cost and coverage. It addresses the year-round carpenter ant and rodent threats while providing seasonal coverage for wasps, spiders, and fall invaders. DIY supplementation with glue traps for spiders and perimeter spray for stink bugs is a reasonable complement to professional service. For a full comparison, see our DIY vs. professional pest control guide.
What Are the Hidden Costs of Pest Control in Seattle?
- Moisture remediation. Carpenter ant and moisture ant treatments often reveal underlying moisture problems. Fixing the moisture source (leaky roof, failed gutter, crawl space drainage) costs $500 to $5,000 and is separate from the pest treatment bill. However, skipping the moisture fix means the pest problem will return.
- Crawl space vapor barriers. If your crawl space lacks a modern vapor barrier, pest control technicians often recommend installing one ($1,500 to $4,000) to reduce moisture levels that attract carpenter ants, moisture ants, and dampwood termites. This is a structural improvement, not a pest control service.
- Wood replacement after carpenter ant damage. Carpenter ant damage repair costs $300 to $3,000 depending on the extent and location. Window sills, door frames, and crawl space joists are the most commonly damaged areas. Pest treatment stops the colony; it does not repair the excavated wood.
- Full-home rodent exclusion. Trapping eliminates existing rats and mice, but they return unless entry points are sealed. Full-home exclusion costs $500 to $2,000 in Seattle, depending on the number of gaps and the age of the home. This is often the most important and most overlooked step in rodent control.
- Wildlife removal permits. Washington state requires wildlife to be handled by licensed wildlife control operators. Raccoon and squirrel removal that involves trapping may require additional permits, adding $50 to $100 to the service cost.
- Follow-up trap checks. Rodent trapping programs require weekly checks ($50 to $100 per check) until activity ceases. A typical Norway rat infestation in Seattle requires three to six weeks of monitoring before the population is fully cleared.
How Can You Save Money on Pest Control in Seattle?
- Choose a quarterly plan. Quarterly service ($100 to $225 per visit) is more cost-effective than reactive one-time treatments and provides year-round coverage for carpenter ants and rodents.
- Fix moisture problems proactively. Repairing leaky gutters, improving crawl space ventilation, and maintaining roof flashing reduces the moisture that attracts carpenter ants, moisture ants, and dampwood termites. These one-time maintenance investments reduce ongoing pest control costs for years.
- Invest in rodent exclusion. A $500 to $2,000 exclusion job prevents the recurring $225 to $650 trapping costs that come from repeated rodent re-entry. Exclusion provides the best long-term return on pest control spending in Seattle.
- Trim trees away from the roof. Cutting branches back 6 to 10 feet from the roofline eliminates pathways for rats, raccoons, and squirrels. A $150 to $400 tree trimming job can prevent $250 to $700 in wildlife removal costs.
- Apply perimeter spray for fall invaders. A $15 to $25 DIY perimeter spray in early September reduces stink bug and box elder bug entry, potentially avoiding a $100 to $225 professional treatment.
- Secure garbage and compost. Seattle's composting requirements can attract rats if bins are not properly secured. Using metal or heavy-duty plastic bins with secure lids reduces rodent attractants at no cost. This is one of the most effective free pest prevention steps in Seattle.
- Compare at least three quotes. The Seattle pest control market has good competition between local and national providers. Pricing can vary by 25% to 40% for the same service. See our guide to the best pest control companies for comparison tips.
What Are the Red Flags When Getting a Pest Control Quote in Seattle?
- No mention of moisture assessment. Most pest problems in Seattle are moisture-related. A company that does not assess crawl space moisture, roof condition, or gutter function during their inspection is missing the root cause of most infestations.
- Treating carpenter ants without locating the colony. Spraying perimeter-only for carpenter ants is a partial treatment. Effective control requires locating and treating the nesting site, which is often inside a wall void, structural timber, or connected tree stump. Ask how they locate colonies.
- No WSDA license. Washington requires pest control companies to be licensed through the Washington State Department of Agriculture. Verify the license before hiring, especially for wildlife removal, which requires additional credentials.
- Poison bait for outdoor rodent control. Many Seattle-area jurisdictions restrict or ban outdoor rodent poison bait due to secondary poisoning of raptors and wildlife. A company that relies primarily on outdoor poison bait may be using methods that are ineffective, restricted, or harmful to non-target wildlife.
- No written estimate or scope. The estimate should detail which pests are covered, what treatment methods will be used, how many visits are included, and what the guarantee terms are. Verbal-only estimates leave too much room for misunderstanding.
What Warranty and Guarantee Options Are Available in Seattle?
Seattle pest control warranties reflect the region's moisture-driven pest challenges and the recurring nature of problems like carpenter ants and rodents.
Re-service guarantees. Most quarterly plans include free re-treatment between scheduled visits if covered pests return. In Seattle, confirm that carpenter ants are specifically included in the re-service guarantee, as some companies treat carpenter ant callbacks as a separate billable service.
Carpenter ant treatment warranties. Stand-alone carpenter ant treatments typically come with a 90-day to one-year guarantee. If the treated colony returns or a new satellite colony appears in the same area, the company re-treats at no cost. This guarantee usually requires that the homeowner has addressed the recommended moisture repairs. If the moisture source remains unfixed, the warranty may be voided.
Rodent exclusion guarantees. Full-home rodent exclusion is typically guaranteed for one to two years. If rodents re-enter through a sealed point, the company re-seals and re-traps at no cost. This guarantee does not cover new entry points created by settling, weather damage, or construction. Annual re-inspection of exclusion work ($75 to $125) is recommended because Seattle's wet climate can deteriorate sealant materials over time.
Dampwood termite warranties. Dampwood termite treatment warranties are shorter than subterranean termite warranties found in southern states, typically covering one to two years. The warranty requires the moisture source to be repaired. If the moisture problem persists, dampwood termites can recolonize the same area and the warranty will not cover re-treatment.
What is NOT covered. Wildlife removal (raccoons, squirrels) has separate warranty terms governed by Washington state wildlife regulations. Damage that occurred before treatment is never covered. Standard re-service guarantees do not cover wasps (which build new nests each year) or seasonal invaders like stink bugs (which must be treated preventively each fall). Moisture damage to structural wood is never covered by pest control warranties.
Choosing a Pest Control Company in Seattle
- Verify Washington WSDA licensing. Washington state requires pest control companies to be licensed through the Washington State Department of Agriculture (WSDA). Verify the license before hiring.
- Ask about carpenter ant expertise. Carpenter ants require specialized knowledge to locate colonies in wall voids, crawl spaces, and connected satellite nests. Choose a company with documented experience treating carpenter ant infestations in the Pacific Northwest.
- Get at least three quotes. Seattle has a competitive pest control market with both national chains and established local operators. Pricing can vary significantly between companies for the same service.
- Confirm moisture and structural assessment is included. The best pest control companies in Seattle include a moisture assessment as part of their inspection, since most major pest problems in the region are moisture-related.
For a complete overview of pest control costs, see our pest control cost guide.
For pricing in nearby cities, see our local guides for Bellevue and Tacoma.
Pest Control Costs in Nearby Cities
- Portland Pest Control Cost
- Boise Pest Control Cost
- Tacoma Pest Control Cost
- Bellevue Pest Control Cost
Related Guides for Seattle
Looking for help with a specific pest problem in Seattle? See our detailed guides:
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