Insects do not always need to build shelter tubes because they could successfully travel through landscaping and other things like wood or tree roots. Insects can also create their shelter tubes easily by using a small gap between the wood for instance or between the walls where the gap is involved.
Some termite species may have nested in the tree trunk, it is easy for these termites to dig up the roots of trees center and follow them for long distances detected and jumped from a lot of meters from where they started. If you are searching online for professional inspections then you can have a peek here https://www.davidinspector.com.
Many houses are built with inherent weaknesses in their construction. This deficiency can allow access to undetected for termites. Unless homeowners have experience with many types of buildings, it is almost impossible to understand where to check them out. Cracks in concrete slabs, wooden stakes through the concrete, a high level of land around the building and other conditions add to these difficulties.
Familiarity with the building can cause homeowners into flames. It can happen to the best of termite inspector when sent to the same property regularly it could happen with homeowners. Homeowners tend to believe that they have a greater knowledge of their fortress than anyone else possibly could, and therefore they are better to check for termites.
Must be curious about the building that one never has seen before often arise all sorts of problems previously undetected by the homeowner. If you must check your own home for termites, please do so in conjunction with a professional, and make sure that you do as much research as possible before doing so.