Originally Posted by wannabecontractor
I'm worried that the house is either slowly sinking in some areas or settling because of not having poured footers for the blocks to sit on.
If you can find a few fixed reference heights near your house you can use one of these garden hose level kits to check the corners of your house each month or each year.
Finding out what is a normal or abnormal sinking rate for a house may be difficult. If you use other houses in the vicinity as your vertical reference points and you get a zero rate of change relative to these, you may be OK (but then, why the cracks?).