JMS Interiors Inc., a CSLB-licensed general building and drywall contractor (License #1059152) on Prospect Avenue, has served Santee's commercial and residential construction market since its founding. Metal-stud framing and drywall finishing on tenant-improvement projects often run concurrently with electrical rough-in by contractors such as Copper Electric, Inc. on Prospect Avenue. The firm's core trades include acoustical-ceiling grid installation, hollow-metal door-and-frame sets, and fiberglass-reinforced panel (FRP) wall systems for commercial kitchens and healthcare environments. Listed in the Blue Book since 2015, JMS coordinates multi-trade interiors alongside painting subcontractors including Windco Painting on Wheatlands Court. Highest-tier scopes involve Level 5 drywall finishes with skim-coat application under critical lighting, 20-gauge structural metal framing for load-bearing partitions, and STC-rated acoustic assemblies exceeding 50 decibels for medical-office sound isolation.