THIS is why you have a home inspection!
It is tempting to save money when buying a house by skipping inspections. This is a perfect example of why you should have a home inspection.
I had a showing today at a cute little home that had some nice upgrades and a nice deck off the kitchen. This is a picture of the support system under the deck. It was only view able if you looked between the boards. I don't believe the homeowner was trying to deceive anyone. This deck project was most likely a do-it-yourself job. Which sometimes means that it isn't up to proper safety code.
I'm not a home inspector, but I believe after a few years of rain pouring downhill coupled with movement of the deck associated with regular use and this could lead to a potential disaster.
A home inspector will go over the house and look in areas you wouldn't normally think to look. They can spot problems that could jeopardize your largest financial investment.