This is the most useful question you can ask about your own house, and it is the one most often skipped. Plenty of Birmingham homes carry visible evidence of movement that finished decades ago and has been stable ever since. Repairing that is spending money to fix something that already stopped.
Why Old Movement Is So Common Here
Houses built on shallow footings in the early twentieth century, on expansive clay, went through their largest adjustments early. Once the soil beneath found equilibrium and the structure found its new position, many stopped moving and stayed put.
Older neighborhoods like Bessemer and parts of Homewood are full of houses with obvious historic cracking, sloping floors and out-of-square door frames that have been exactly the same since the 1970s.
Signs Movement Is Historic
Cracks with dirt, paint or old caulk in them, or that have been patched before and not reopened. Paint layers running unbroken across a crack. Cracks with softened, weathered edges rather than sharp fresh ones.
Doors that have been planed or rehung to fit a settled opening and have worked fine ever since.
Nothing changing between one season and the next.
Signs Movement Is Active
A crack that has widened, lengthened, or reopened after being patched. Fresh, sharp edges and clean concrete or masonry inside the crack.
Doors and windows that have started sticking this year when they did not last year.
New gaps appearing between crown molding and ceiling, or baseboard and floor.
Fresh drywall cracking, particularly above openings.
Anything that is noticeably different after a very wet spring or a long dry summer, since that is when clay does most of its moving.
How to Find Out Properly
Mark it and wait. Draw a pencil line across the crack at each end, write the date beside it, and photograph it with a tape measure alongside. Repeat in three months and again after a season change.
A crack monitor — a small gauge glued across the crack — does the same job with better precision and costs very little.
Six months of that evidence will tell you more than any inspection carried out on a single afternoon, and it puts you in a far stronger position when you do get quotes.
When Not to Wait
If movement is rapid, if a wall has visibly bowed, if a floor has dropped suddenly rather than gradually, or if there is a depression appearing in the yard, do not spend six months monitoring. Get it assessed now.