A property owner may sell a whole lot or block within a registered plan of subdivision, even though the landowner may own abutting lots. Section 50(28) of the Planning Act, R.S.O. 1990, c.P13, provides that part of a lot on a registered plan of subdivision cannot be transferred without the approval of the municipality. Part-lot control has the effect of preventing the division of land in a registered plan, other than that allowed for in the approved plan of subdivision, without further approvals.

The part-lot control provisions of the Planning Act allow a municipality to pass by-laws to remove part-lot control from all or any part of a registered plan of subdivision. Such a by-law has the effect of allowing the conveyance of a portion of a lot without requiring the approval of the land division committee.