Substance LLC

Substance LLC, doing business as Substance Architecture Interiors Design, is a for-profit limited liability company headquartered at 1300 Walnut Street in Des Moines, Iowa. The firm specializes in providing architectural, engineering, and facility management services to federal civilian agencies, with a particular focus on renovation, repair, and modernization projects across the Midwestern United States. Substance LLC has maintained its federal contracting registration in SAM.gov since December 2006 and holds significant experience delivering complex building improvement initiatives for government properties throughout Iowa, Kansas, Missouri, and Nebraska.

Substance LLC has demonstrated extensive expertise through a robust portfolio of federal contract delivery orders, all of which have been firm fixed-price awards issued without small business set-aside designations. The company's service offerings encompass comprehensive architectural and engineering design services across multiple project categories, including facility assessments, HVAC systems design and replacement, roof replacement and fall protection systems, water infiltration remediation, accessibility improvements, asbestos abatement design, facade repair, exterior building analysis, blast standard evaluations, boiler and generator integration, and chiller replacement projects. Notable projects include work on the Neal Smith Federal Building in Des Moines across multiple initiatives valued at over $2.2 million combined, the Iowa City Federal Building for roof replacement and HVAC improvements, the Sioux City Federal Building and U.S. Courthouse for multiple design and feasibility studies, and the Robert V. Denney Federal Building and U.S. Courthouse in Lincoln, Nebraska for space recapture and feasibility studies. Funding has primarily been provided through the General Services Administration Public Buildings Service Region 6, with one contract funded by the Internal Revenue Service and another by the National Resources Conservation Service. Substance LLC frequently partners with specialized subcontractors including Imeg Consultants Corp. for mechanical, electrical, and plumbing design services; Gastinger Walker Architects for construction management; and FP&C Consultants KC LLC for fire protection engineering. The company's delivery orders have ranged from approximately $9,000 to over $926,000, with completion dates extending through March 2026.

Substance LLC holds a $25 million indefinite delivery, indefinite quantity (IDIQ) contract with the General Services Administration Public Buildings Service Region 6, awarded on August 23, 2021, and scheduled for completion on August 22, 2026. This multiple-award contract carries a total small business set-aside designation and includes a base year with four option years, enabling the GSA to rapidly task Substance LLC for a comprehensive range of architectural, engineering, and facility management services throughout the Region 6 service territory. Under this IDIQ vehicle, the company provides on-call professional services supporting the GSA's infrastructure maintenance and modernization objectives. To date, the company has received at least nineteen delivery orders issued under this IDIQ contract, with task orders addressing specific facility improvement projects at federal buildings across Iowa, Missouri, and Nebraska. The IDIQ structure has proven instrumental in facilitating streamlined procurement mechanisms that expedite project delivery for various federal agencies, including the General Services Administration, Internal Revenue Service, National Resources Conservation Service, and other civilian federal departments requiring facility design and engineering support in the Midwest region.

Substance Architecture is a collaborative design practice established in Des Moines, Iowa. The firm brings together the talent and expertise of some of the region's most recognized design professionals engaged in the disciplines of Architecture, Interior Architecture, and Design. Our staff is led by a leadership team that includes three Principals, four Associate Principals, and two Associates. This team reinforces the firm's mission to provide innovative, sustainable, and visually appealing designs and further enhances our ability to serve our clients.