Irvine gets roof rats for a reason that surprises people: the landscaping is too good. A city planned around continuous greenbelts, mature street trees and dense common-area planting is a city with an unbroken aerial highway, and roof rats travel through canopy rather than across the ground. Add tile roofs on nearly every house and you have the two ingredients. We fix this mechanically, with trapping and exclusion, and we do not put rodenticide on your property.
Irvine specifically
The tile roof is the defining feature of rodent work in this city. Barrel and S-tile leave an open gap at the eave course, and unless that line was closed properly with metal bird stop at the time of construction it is a doorway. A roof rat needs about half an inch. On a great many Irvine homes that gap is either open, or was closed with foam that has since degraded, and it runs the entire perimeter of the house.
The second Irvine factor is that the greenbelts genuinely work as corridors. Between the landscaped strips, the mature ficus and pine along the collector roads, and the common-area planting inside each village, an animal can move a long way without ever being exposed. That is why rodent activity here often shows up across a whole street at once rather than on one isolated lot, and why a neighbour treating their house alone rarely changes much.
Where they actually are
People look at ground level and find nothing, because roof rats live above you. Inside the attic they run the eave line and the perimeter of the insulation rather than the middle of the space, which is why a quick look from the hatch usually shows nothing.
Outside, we start at the eave tile line, then plumbing vent boots that have dried and cracked, then attic and gable vents where the screen has failed, then the junction where a patio cover or California room was tied into the original roof. In Irvine we also pay close attention to Mexican fan palms with unstripped skirts, which are nest sites in their own right, and to the tall pines and ficus along village perimeters where branches now overhang second-story rooflines.
The signs people miss
- Scratching or rolling sounds overhead in the first two hours after dark, then again before dawn. That nocturnal pattern is the fastest way to separate roof rats from squirrels, which are active in daylight.
- Dark grease smears along a fascia board, rafter, pipe or wall plate. That is body oil from repeated travel and it marks the exact route in.
- Droppings running in a line along the attic perimeter rather than scattered. Roof rat droppings are about half an inch with pointed ends.
- Fruit hollowed out and left as an intact shell under a tree, and chewed drip irrigation line. Both show up before anyone hears anything in the attic.
How we handle it
The inspection is free and it is a roof and attic inspection rather than a walk around the yard. We get into the attic where access allows, find the travel routes, and map every opening on the structure. A rodent problem that comes back is almost always one where a single opening was missed, and on a tiled Irvine roof there are a lot of places to miss.
The work is trapping inside the structure to clear what is already there, then exclusion so it does not repopulate. In practice that means closing the eave tile line with rodent-grade metal rather than foam, replacing failed vent screens with galvanized steel, collaring plumbing vents, and sealing the patio-cover junction properly. Where landscaping is the access route we will tell you exactly which branches need cutting back and how far.
On rodenticide, and why we do not use it
This is where we part company with most of the industry, and in Irvine it matters more than in most cities. We do not apply rodenticide, bait or any pesticide on any job.
The practical reason is that poison does not close an entry point. It converts a fixable problem into a recurring monthly bill, and a rat that dies inside a wall cavity leaves you paying someone to cut drywall. The second reason carries more weight here than almost anywhere in Orange County: Irvine is wrapped in preserved open space that supports owls, hawks, bobcats and coyotes, and anticoagulant rodenticide concentrates as it moves up the food chain into exactly those animals. California has tightened restrictions on these products repeatedly for that reason. Trapping and sealing the structure achieves the same result without putting anything into that system.
Our rodent control work in Irvine
Photos are from our own crews on real jobs across Orange County and Los Angeles — never stock. We run these same steps on every Irvine call.
How we handle the animal and the mess
Mechanical control only: trapping and physical exclusion. Every trap we set is checked at least once every 24 hours.
Once the structure is clear, the second half of the job is what got left behind. Droppings and urine in attic insulation are a contamination issue rather than a cosmetic one, and we remove, bag and haul the affected material rather than leaving it in place. We vacuum and clean the contaminated area.
We will also be clear about where our work stops. We remove contaminated insulation. We do not install replacement insulation and we do not perform wood repair or structural work, because those require a contractor license we do not hold. On HOA properties we will also tell you which parts of the exclusion are likely to need architectural approval so you are not caught out after the fact.
Rodent pressure across the Irvine villages
The older villages carry the most rodent work, and it tracks tree maturity almost exactly. University Park, Woodbridge, Northwood and El Camino Real were built from the early 1970s onward and their landscaping is now fully grown, with canopy reaching second-story rooflines in places. Those are the neighbourhoods where activity tends to run along a whole street rather than one house.
The canyon-edge villages behave differently. Turtle Rock, Quail Hill, Shady Canyon and Orchard Hills sit against open space that supports its own rodent population and, importantly, the predators that feed on it, which is a large part of why rodenticide use on those streets is such a poor idea. Newer construction around the Great Park, Portola Springs and Cypress Village generally has better-detailed rooflines and fewer entry points, and there the calls we get more often trace to a specific defect, a failed vent screen or an unsealed solar penetration, rather than a general condition.
Questions we actually get asked
We hear something in the ceiling after dark. Rats or squirrels?
Timing settles it. Roof rats are nocturnal and get loud in the first couple of hours after sunset, then again before dawn. Tree squirrels are active in daylight and go quiet overnight. If it starts once the house is quiet in the evening and stops by morning, that is roof rats. If it wakes you at seven and runs through the afternoon, that is squirrels, and the exclusion is different because squirrels chew far larger openings and can enlarge a gap a rat merely slipped through.
Our management company uses bait stations around the community. Does that help us?
It reduces the number of animals in the common area to some degree, but it does nothing about the opening on your roof, which is what actually determines whether they get into your attic. It also carries a real cost in a city like Irvine, where the surrounding open space supports owls, hawks and bobcats that eat poisoned rodents. Our position is the same regardless of what the association does: seal the structure and trap what is inside it. That is the part that ends the problem at your house.
Every house on our street seems to have this. Is treating just ours worth it?
Yes, because the thing that decides whether rats live in your attic is your roofline, not the neighbourhood population. You cannot control the greenbelt or your neighbour’s untrimmed palm, but a properly closed eave tile line, sound vent screens and collared plumbing penetrations keep them out regardless of how many are moving through. It is genuinely worth telling your neighbours what you found, since trimming back canopy along the street helps everyone, but you do not need their cooperation to fix your own house.
The rest of what we do in Irvine
Rats are rarely the only thing that found the roofline. When we are up there we check the whole structure, and these are the Irvine services most often paired with this work.
Licensed for the work we advertise, and clear about the rest
Wildlife control, structural pest control and construction are three separate licenses in California. Plenty of companies blur that line. We would rather tell you exactly where ours sits.
- Wildlife trapping and exclusion — this is us. Tri County Trappers operates under California Department of Fish and Wildlife Trapping License TP-10188, and every technician on our crew carries their own CDFW trapping license. Not a company license with unlicensed helpers under it. Each one, individually licensed by the State.
- Attic cleanout and decontamination — this is us. Removal, bagging, vacuuming and cleaning of contaminated material. We do not apply pesticides, rodenticides or bait on any job.
- Insulation, wood repair and structural work — not us. Tri County Trappers does not hold a Contractors State License Board license. That work is performed by a licensed contractor. We inspect it, document it and hand over the photographs so nobody starts cold.
- Structural pest control (Branch 2) — not us. If your situation needs it, we say so and point you to a licensed structural pest control operator rather than stretching our own license over it.
General liability, professional liability, workers’ compensation and commercial auto, all current, with limits well above what the State requires of a licensed trapper. Certificates on request, before you let anyone on your roof.
OUR METHOD
No rodenticides. No baits, powders, or treated devices.
We work with live traps and exclusion only — on every job, every time. That eliminates the secondary-poisoning pathway that kills owls, hawks, and the pets that eat poisoned rodents. California Department of Fish and Wildlife Trapping License TP-10188.
What rodent control costs in Irvine
Rodent work is priced in two parts, because it is genuinely two jobs.
- Sealing the building, $500 to $800 for a standard sized home. Priced by how many repairs it takes to make the property inaccessible, not by how many holes are visible from the driveway.
- Cleaning up what they left, $1,500 to $6,000. Contaminated insulation out, the space sanitised, and new insulation in where it is needed. Square footage is the biggest driver.
Plenty of homes need the first without the second. We will tell you which one yours is, and we will tell you if it only needs sealing. See what all of our work costs, including trapping and gopher removal.
The inspection is free with no conditions, and there is no trip fee if you decide not to go ahead. We can usually be out the same day.
Book a free inspection Call (949) 304-5445
Talk to the owner
Tri County Trappers is owner-operated. You work directly with the owner and our licensed specialists — rat and rodent control in Irvine is never handed off to an unlicensed subcontractor. Every technician on our crew carries their own CDFW trapping license, the owner reviews every inspection and every completed job, and runs jobs himself. Someone answers every call, seven days a week — call anytime. Free inspection, no obligation, and a clear number before anything starts.
Call (949) 304-5445 Email [email protected]
California Department of Fish and Wildlife Trapping License TP-10188, valid through 6/30/2027, and every technician on our crew carries their own. General liability, professional liability, workers’ compensation and commercial auto coverage — certificates on request. Member, National Wildlife Control Operators Association. 4.9 average rating on Google. We check every trap we set at least once every 24 hours. Where 14 CCR § 465.5(g)(2) applies it requires traps to be visited at least once daily — we hold to a rolling 24-hour interval, which is stricter than the rule. Payment plans available on larger jobs.
Book a free inspection
Pick an arrival window and it goes straight onto our schedule. You get a written report of what we found either way — and if you don’t have a problem worth paying to fix, we’ll tell you that.
No payment is taken to book an inspection. California Department of Fish and Wildlife Trapping License TP-10188.