Smell · nothing found
You Can Smell It, You Cannot Find It
One question decides whether your money is well spent here: does the smell point at a space somebody can enter? An attic, a crawl space, a garage, the void under a porch, and there is something to retrieve. A blank plastered wall with nothing behind it but studs, and usually there is not.
Five checks before you pay anyone
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Find the peak twice
Once at floor level, once upright. Where both attempts converge on a hatch, an access door, the shared wall of a garage or the base of an exterior wall, whatever is producing it is almost certainly enterable.
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Run the heat and listen to your nose
If it sharpens with the blower on, it is being carried rather than sitting still, and the route is either ductwork or a cavity the warm air tracks past.
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Watch where flies collect
Flies emerge near where they developed. A single window, a lone vent or one ceiling fixture collecting them will point more accurately than your nose can, and almost nobody thinks to look.
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Think back a few weeks
Movement overhead, then silence, then a smell in that same part of the house. That sequence narrows it to a room more reliably than anything else on this list.
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Charge every drain
An evaporated trap under a basement floor drain or a shower nobody uses produces a smell people will swear is an animal. Pour water down every one of them, give it twenty-four hours, and see whether anything changed. It costs nothing to rule out.
If it is behind finished plaster
Then there is no job here to sell you, and this site will say so.
A rodent that died in a stud bay, with no hatch above and no void alongside, falls outside what gets booked here. The route to it runs through your wall, and the wall then has to be made good again.
What happens instead is that it eases off as the remains dry out. The pace is set by body size, by the season, and by how much air moves through that bay. Anyone who hands you a precise number of days has made it up.
When a visit does earn its money
Three situations qualify. The trail ends at a space with a door, hatch or panel on it. Or the smell is heavy and new enough to suggest something well above mouse size. Or you have honestly run out of ideas and would rather pay somebody to look than start levering trim off your own walls.
Things that smell the same
Dried traps, a sump that has quit, food rotting behind an appliance, a bird stuck in a flue. All get described identically on the phone. Saying what you have already ruled out shortens the call.
How these usually end
Most of the time the answer is a space with a way into it, which makes the job an indoor recovery. Now and again it turns out to be outdoors, tight against the foundation or beneath decking, and that is outdoor pickup. Once in a while it is a deer that was never visible from a window. Searching and collecting are priced differently, and the cost page says why.