Elevation readings room by room
Floor heights are taken across the house and plotted into a map showing the high and low areas and the shape of the movement.
An inspection turns "I think something is wrong" into numbers. An independent provider takes elevation readings across the floor, looks at the drainage and the structure outside, and should give you a written picture of what the house is doing before anyone talks about repairs.
A survey is useful even when the answer is "nothing needs doing yet". Knowing the house is two inches low at one corner, and having that written down with a date on it, is what lets you tell a year from now whether the movement is still going or whether it has settled.

The visit is about evidence. Everything below feeds the same question: how much has the house moved, and is it still moving?
Floor heights are taken across the house and plotted into a map showing the high and low areas and the shape of the movement.
Grading, gutters, downspouts, the slab edge, brick and mortar cracking, tree positions and any standing water are all noted.
On pier-and-beam houses, piers, beams, shims, joists and ground conditions under the floor are inspected directly.
Sticking doors, cracks, trim separation and floor slope are photographed and tied to the corresponding readings.
Drainage, trees, seasonal shrink-swell and the possibility of a leaking line under the slab are each considered against what the readings show.
Ask for the measurements and the findings in writing whether or not you hire that provider for any repair, so you can take them elsewhere if you want.
If repair is warranted, the report is what a scope is built from. If it is not, you have a dated baseline and a list of the things outside that are worth fixing cheaply. Either way the paperwork is yours.
For a property transaction, or for a larger or unusual house, an independent structural engineer evaluation is worth considering. An engineer is paid by you rather than by a contractor, and can write a repair scope that you then take to companies for pricing. It is a common step for buyers, sellers and anyone who wants a recommendation checked by someone with no work to sell.
From here, read about slab repair, pier-and-beam repair or drainage and root barriers, see how the whole process runs, or call about a visit.
Elevation readings taken across the floor, a walk around the outside looking at grading, gutters, cracking and trees, a crawl-space check if the house has one, and a written summary of what was found. It is measurement rather than opinion, and it should take the time it takes rather than fifteen minutes and a sales pitch.
Consider it when a lot is riding on the answer: buying or selling, an unusual or expensive house, or a repair quote you want checked. An independent structural engineer has no repair work to sell and can write a scope you get priced by others. Ask an independent provider whether they will work to an engineer scope.
Often yes, because the value is the baseline. A dated set of readings today means that next year you can tell movement from imagination. That is especially useful before buying, after a very dry summer, or if you have patched the same crack more than once. Compare it with the repair options only once you have numbers.
Get the elevations measured and written down before anyone quotes you for work.