Part 13: General Schedule 7: Plan making Section 15IC: Joint supplementary plans by agreement Effect
Subsection (1) enables two or more local planning authorities to agree to prepare a joint supplementary plan together, and if they do, references to the area of the local planning authority in section 15CC(3) means the combined areas of the relevant authorities involved.
	Subsection (2) enables two or more minerals and waste planning authorities to agree to prepare a joint supplementary plan, in which case references to the relevant area in subsection (5) of section 15CC (content of minerals and waste supplementary plans) means the combined relevant areas of the relevant authorities.
	Subsection (3) sets out that the provisions within Part 2 of the Planning and Compulsory Purchase Act 2004 about steps in relation to a supplementary plan also apply in relation to a joint supplementary plan.
	Subsection (4) provides that any step that must be taken in relation to the preparation of the joint supplementary plan, must be taken by all the relevant authorities involved in the joint supplementary plan.
	Subsection (5) allows the Secretary of State to prescribe (in regulations) modifications to Part 2 of the Planning and Compulsory Purchase Act 2004 as it applies to joint supplementary plans.
	Subsection (6) sets out that where a spatial development strategy is also operative in the joint supplementary plan area, or any part of it, the joint supplementary plan will have to be in general conformity with the relevant spatial development strategy, however the effect of the strategy only applies to those parts of the joint supplementary plan area that are covered by the strategy.
	Subsections (7) to (10) set out procedural details that apply if one of the relevant authorities withdraws from a joint supplementary plan agreement.
	Subsection (11) provides the Secretary of State with regulation making powers to define a ‘corresponding supplementary plan’ or a ‘corresponding joint supplementary plan’ for the purposes of this section.
	Subsections (12) and (13) define joint supplementary plans and relevant authorities for the purposes of this section.