I have a 28′ x 44′ 3 story home that needs leveling. The outside is a 3 course brick and appears that it has either settled evenly or has not settled. The 5 inside piers seem to have settled about 3 inches in the middle. The beams are 4 2×12 spanning 8 feet and one section spans 10 feet.
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Sounds like a typical old row house. It can be jacked up, whether you're the one to do it is a different question. It didn't sag quickly and it can't be jacked back up quickly either. You'd need a heavy screw jack at each column and a lot of time. The last one I did took over a uear to get back level. We went by the house once a week and gave each jack a half turn. Didn't break anything but we lived on pins and needles for several years after we finished!
I've found that you can often jack a lot faster than one would think. The limiting factor is generally that the wood has "taken a set" and if you jack too rapidly you can, eg, lift a beam off it's end supports while jacking in the middle.