The cheapest treatment is often no treatment
This sounds like a way to avoid selling you something, and it is actually the most practical advice on the page for a garden heavy city. Start from what the animal is doing. A snake that has taken up residence along a fence line or in a mulch bed is hunting the slugs, amphibians and young rodents that a wet climate produces in quantity. It does that continuously, silently and without any product. Remove it and the prey population rebounds, and the next animal that finds the same food supply moves in. So the sensible objective is separation rather than elimination: keep snakes out of the building and let them work the yard. That reframes the whole purchase. Instead of paying repeatedly for removals, you pay once for sealing and then maintain the yard. There are limits to this. Anything unidentified gets treated as unknown and left alone. Anything inside the house gets removed. Households with very small children or dogs that hunt may reasonably want a lower tolerance in specific parts of the yard. But the default position in a Portland garden, once a licensed operator has confirmed a harmless species, is that nothing needs to be bought at all.
Inside a crawl space job
Most indoor snake problems in this housing stock are crawl space problems, so it is worth knowing what a competent job under the floor looks like. The technician goes in with a light and works the perimeter, not the middle. They are looking at the inside face of the foundation wall for daylight, at the sill area, and at every point where a pipe, wire or duct passes through. Any of those can exceed the quarter inch UC IPM identifies as worth sealing. Outside, the vents get measured and screened with galvanized quarter inch mesh fastened over the frame rather than stapled loosely to wood that is already damp. The access hatch is the item that fails most often: warped, undersized, propped shut, or missing a latch entirely. Rehanging it against a solid frame is usually the single highest value repair on the property. Expect the report to mention rodents, because the two findings travel together. Droppings, runways and chewed insulation explain why an animal came in the first place. Ask for photographs of the sealed points. In a space you will not personally revisit, photographs are the difference between work you can verify and work you have to take on faith.
Rain, soil movement and why sealing needs a recheck
A wet climate turns exclusion into a maintained system rather than a finished project, and understanding that saves an argument with the company later. With 43 inches of rain falling on ground near 50 feet of elevation, soil against a foundation swells, settles and drains repeatedly through the year. That movement works at mortar, opens hairline cracks and pulls sealant away from masonry over time. Untreated wood at the base of a skirt or a hatch frame absorbs moisture and warps, which is exactly how a door that latched in June stops latching by February. The practical routine is one spring walk. Hold a flashlight flat against the wall so the beam rakes across the surface, since side lighting throws shadows into openings that a straight on look hides completely. Check the vent screens for rust and loose fasteners, push on the hatch to see if it still seats, and look at the deck junction. If you have the written list of sealed locations from the original job, this takes fifteen minutes. Without it, you are surveying the whole foundation again, which is why the list matters more than most homeowners realize when they are handed it.
The rodent conversation you cannot skip
Every serious snake plan turns into a rodent plan, and in a damp climate the rodent plan turns into a moisture and clutter plan. The chain is short. Wet ground at 73 percent humidity supports invertebrates and amphibians. Stored material, open compost and dense ground cover shelter rodents. Rodents draw the larger snakes. Break any link and the property becomes less interesting. The most effective interventions are unglamorous. Compost into a closed bin. Boards, pallets and pots onto racks. Bird seed and pet food into sealed containers. Ground cover cut back so a bare strip of soil shows along the foundation, which both removes the covered route and lets you see the wall. Inside the crawl space, rodent suppression is part of the same visit, since the technician is already there and the evidence is already in front of them. UC IPM names brush, rock piles and rodent burrows as attractants worth removing, and a Portland yard often expresses all three as tidy looking garden features. Recognizing them for what they are is most of the work; the rest is a weekend and a rack.
Five questions that sort out two estimates
When two companies quote very different numbers for the same property, they are almost always describing different jobs. These questions expose the difference quickly. First: what species did you identify, and how. A company that answers precisely has handled these animals; one that speaks in generalities has not. Second: how many openings will you seal, where are they, and with what material. You want a count and a list, and you want quarter inch galvanized mesh named rather than a vague reference to sealing. Third: what is not included. Rodent work, ground cover clearing and follow up visits are the three items most often left off the page and billed afterward. Fourth: what happens to the animal. Capture and release on site or nearby is the legitimate answer, and any company that treats destruction as routine should be asked about protected species. Fifth: which single opening on this house would you close first. This is the question that separates a company that walked your foundation from one that priced an average Portland house from the truck. Compare the answers before comparing the totals, and the totals usually explain themselves.