Historic Preservation Design Guidelines The Historic Preservation Design Guidelines provide useful guidance on many maintenance and repair problems encountered in historic buildings. While the staff cannot substitute for the services of a preservation architect or contractor, we can provide general technical advice and direct you to additional sources of information. Please note:  We are in the process of updating and revising our guidelines. As new guidelines are completed, they will be posted on this page.   Introduction to the Historic Preservation Guidelines* Windows and Doors for Historic Buildings* Roofs on Historic Buildings* Walls and Foundations on Historic Buildings* Basement Entrances and Basement Windows on Historic Property* (Proposed Guidelines) Landscaping, Landscape Features and Secondary Buildings in Historic Districts* Energy Conservation for Historic Buildings* Accommodating Persons with Disabilities in Historic Buildings*   Additions to Historic Buildings* Porches and Steps on Historic Buildings* New Construction in Historic Districts* Guidelines for Historic Commercial Buildings*   (New - May 2010)  The Historic Preservation Office has developed a series of short handouts relating to repair and replacement of historic property elements. Door Replacement for Historic Properties*    Electric Meter Boxes in Historic Districts* Masonry Repair and Repointing*   Metal Repair and Fabrication* Roof Decks and Roof Additions*  (Updated - July 2010)  Window Repair and Replacement* Design Guidelines specific to each historic district are currently being developed. When completed, they will be posted here. Foxhall Village Historic District* (New - May 2010) * This document is presented in Portable Document Format (PDF). A PDF reader is required for viewing. Download a PDF Reader or Learn More About PDFs.