Once signed, the responsibility for the site typically shifts. If the foundation is "crooked," it’s much harder to blame the previous team later without this act. What to check before signing:

It is a formal document signed by both the contractor (who built the foundation) and the client (or the next contractor) confirming that the work meets technical standards and is ready for the next phase. Why is it non-negotiable?

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Check the horizontal plane with a level—walls shouldn't start on a slope.

Accurate axes and diagonals (deviations should be minimal).