If one party makes accessions without agreement and the improvements can be "undone" without damaging the property,the improver must undo them.

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This is known as the "doctrine of accession" and applies in situations where one party makes improvements to property without the agreement of the owner. If the improvements can be reversed or undone without causing damage to the original property, then the improver must undo them. This is based on the principle that the owner of the property has the right to control what happens to it and any changes made without their permission are not valid.

If One Party Makes Accessions Without Agreement and the Improvements