The Files subseries consists of standard forms of agreement, change orders, invoices for architectural service, applications and certificates of payment, specifications, photographs, notes, correspondence, drawings and sketches, purchase orders, job reports, schedules, and other material created by Pettersen (and, to a certain extent, her associates) in the course of work on various residential and commercial projects. Projects primarily include the design and construction of new residences, and additions and alterations to existing residences. Most projects are located in New Jersey although there are also projects in New York, Massachusetts, Vermont, Connecticut, Maine, Michigan, Colorado, Virginia, North Carolina, South Carolina, Georgia, Tennessee, and Florida.

Pettersen classified some of her files as “Dead Files.” This classification has been retained and is indicated in the Project Index with an italicized box number. The “Dead Files” include boxes 40-47.