The 2005 National Register nomination talks about the survey of structures, determining those that are historically contributing and those that are not.

Buildings were classified as either contributing or non-contributing based on the results of a reconnaissance-level survey of the neighborhood area in 2004. These evaluations were updated in 2020 when the district was expanded.  Each building was evaluated for eligibility using the following guidelines set by the Utah State Historic Preservation Office:

  • Eligible/significant: built within the historic period and retains integrity; excellent example of a style or type; unaltered or only minor alterations or additions; individually eligible for National Register for architectural significance; also, buildings of known historical significance.
  • Eligible/Contributing: built within the historic period and retains integrity; good example of a style or type, but not as well-preserved or well-executed as a significant building, though overall integrity is retained; eligible for National Register as part of a potential historic district or primarily for historical, rather than architectural, reasons. The additions do not detract and may be reversible.
  • Ineligible/Non-Contributing: built during the historic period but has had major alterations or additions; no longer retains integrity. The resource may still have local historical significance.
  • Out-of-period/Non-Contributing: constructed outside the historic period.

Evaluations are based primarily on age and architectural integrity. A building may sometimes appear newer than its actual construction date because of intrusive alterations and additions. Surveyors attempt to determine the oldest portion of the building by looking for signs of greater age such as composition, massing, fenestration, foundation materials, chimneys, and landscaping.