General Principles for Exterior Maintenance and Alterations

Principle 1: Routine Maintenance is Essential for Preservation
With proper maintenance, most historic buildings can last for centuries. Poorly functioning gutters, downspouts, and flashing, standing water at foundations; water splashing onto walls from the surrounding hard surfaces; and water-entrapping vegetation such as vines and shrubs on or near walls and foundations can all contribute to the deterioration of historic structures. Each of these issues can be prevented or corrected through proper maintenance.

 Principle 2: Preservation of Features in Place in Preferred Over Replacement

Maintaining and repairing features is preferred over replacing features as to maintain the high-quality materials, character, and embodied energy of historic buildings and to reduce the amount of waste that goes to a landfill. However, if features are deteriorated beyond repair (more than 50%), in-kind replacement using new components that match the original in form, finish, and materials is favored while replacement with comparable substitutes will be considered.

Principle 3: More Flexibility in Treatment and/or Replacement May be Considered in Locations Not Visible from the Public Right-of-Way
Building features not visible from the public right-of-way are less likely to detract from the character of the structure or district. More flexibility in the treatment and/or replacement of features in these locations may be considered if the historic integrity of the structure has already been lost or compromised and/or other unique circumstances exist that warrant consideration of a more flexible approach. However, the OHP will review proposed alterations on a case-by-case basis to determine whether they are appropriate.

Source: sanantonio.gov/historic/HistoricDistrictGuidelines.aspx