What changes to my property necessitate an approved ARC request?

As per Article V, Section 1 of the Covenants, Conditions, Easements and Restrictions for Escavera Subdivision:

[N]o building, fence, wall, porch, deck, or any other structure or improvement (collectively, “Improvements”). Including, without limitation, the alteration or painting of the exterior surface of any Improvement shall be undertaken upon any Lot unless the plans and specifications and location of the proposed Improvement shall have been expressly approved in writing by the Architecture Review Committee. No subsequent alteration or modification of any Improvements or construction, erection or installation of additional Improvements may be undertaken or allowed to remain on any Lot without the review and express written approval of the Architecture Review Committee in accordance with he provisions of this Declaration.