Every fact below links to its source. Informational only. Ownership statements are limited to primary announcements and filings.
- Headquarters
- Portland, Oregon, as listed by ENR in the 2026 Top 500 Design Firms; USAspending and the Texas board record also list PortlandSource: enr.com/toplists/2026-top-500-design-fi…
- Founded
- 1969Source: interfaceengineering.com/about
- Ownership type
- Employee-owned (ESOP): the firm announces its next chapter as a 100% employee-owned company after 55 years of growth; a DOL Form 5500 ESOP filing is listed under ESOP dataSource: interfaceengineering.com/about
- Website
- interfaceengineering.comSource: interfaceengineering.com
Legal name, DBA and former names
- Interface Engineering, Inc.Source: interfaceengineering.com/about
Identifiers (UEI, state registrations)
- SAM UEI HBJHS9QLSCW5 (as shown on the USAspending recipient record) and Texas TBPELS firm no. 29866.Source: usaspending.gov/recipient/4fd8db60-1e32-5d8d-2e…
Ownership type
- Employee-owned (ESOP): the firm announces its next chapter as a 100% employee-owned company after 55 years of growth; a DOL Form 5500 ESOP filing is listed under ESOP data.Source: interfaceengineering.com/about
Sponsor, parent or transaction
- DOL Form 5500 plan year beginning 2024-01-01 names the Interface Engineering ESOP; the firm's statement of becoming 100 percent employee-owned after 55 years implies a transition around 2024 (arithmetic from the founding year; the exact date is not published on the page)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Services and markets
- Multidiscipline engineering firm focused on sustainable design and building engineering.Source: interfaceengineering.com/about
Leaders
- Andy Frichtl, Managing Principal.Source: interfaceengineering.com/about/leadership
- Roger Frechette, Managing Principal.Source: interfaceengineering.com/about/leadership
- Hormoz Janssens, Managing Principal.Source: interfaceengineering.com/about/leadership
Licences (board records)
- Texas TBPELS roster lists Interface Engineering, Inc. (firm no. 29866, type NS, expires 2027-07-31)Source: tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
Federal awards (contracts)
- USAspending recipient record INTERFACE ENGINEERING, INC (Portland, OR), contract award obligations: FY2021 $103,500, FY2022 $77,700, FY2023 $123,405, FY2024 $43,610, FY2025 $0 (award types A to D; obligations as published, including modifications and negative adjustments)Source: usaspending.gov/recipient/4fd8db60-1e32-5d8d-2e…
ESOP plan data (Form 5500)
- DOL Form 5500 plan year beginning 2024-01-01: INTERFACE ENGINEERING ESOP (ACK_ID 20251015103010NAL0005961248003), 241 active participants and total plan assets of $10,299,920 at year end.Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Public filings
- DOL Form 5500 filings, plan year beginning 2024-01-01, NAICS 541330: INTERFACE ENGINEERING ESOP (ACK_ID 20251015103010NAL0005961248003, 241 active participants); INTERFACE CONSULTING INTERNATIONAL, INC. PROFIT SHARING PLAN (ACK_ID 20260220161535NAL0013192450001, 0 active participants); INTERFACE ENGINEERING INC. RETIREMENT PLAN (ACK_ID 20250916092921NAL0001223267001, 250 active participants)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Rankings and awards
- Listed in the ENR 2026 Top 500 Design Firms.Source: enr.com/toplists/2026-top-500-design-fi…
Sources of record
- https://www.interfaceengineering.com/about
- https://www.usaspending.gov/recipient/4fd8db60-1e32-5d8d-2e03-4402832d4193-P/latest
- https://www.enr.com/toplists/2026-top-500-design-firms-4
- https://www.interfaceengineering.com/
- https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/public-disclosure/foia/form-5500-datasets
- https://www.interfaceengineering.com/about/leadership
- https://tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
Ownership tag: Employee-owned (ESOP). Profiles are informational, compiled from public sources linked above. Firms may request corrections. A listing is not an endorsement.
