Rodent problems are extremely common and they had a ginormous house. This means that there are probably at least one hundred potential entrance points. Routine maintenance of all homes should inspect potential entrance points even if you have rodents or not. The average ranch house has probably a dozen. Entrance points occur wherever two roofs meet. Gutters. Chimneys. Any rotten wood. Shingle issues, water damage etc etc etc.
It's a constant battle for us. Hubby spends lots of time on the roof. I'm sure that particular home had numerous vulnerabilities. Generally custom built homes have numerous roof levels. A major problem for us is an addition to the home. There is a gable of one roof that meets with a flatter roof and it sits back about a foot from the edge of the roof. This area is a huge sore spot for us.
I really can't imagine them not having a critter problem. That was the first thing I thought when I heard that a pest control person was at their place. Rodents tend to be more of an indoor issue in the winter.
You can see here all the possible vulnerable spots on a typical roof.
The dormer area looks particularly vulnerable, although anywhere could be.
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Additionally almost every large residence around here has outdoor bait boxes. These require routine inspection by pest control. I can imagine their house required frequent inspection of potential entrance points.