BSI Constructors
BSI Constructors is a St. Louis-based general contractor founded in 1972 providing lump sum bidding, construction management, design-build, and self-perform services across 16 building categories to institutional clients in the St. Louis metro area, with over 1,300 completed projects and a 50+ year track record.
- Company typePrivate
- Founded1972
- HeadquartersSaint Louis, United States
- Headcount101–250
- GTM typeB2B
- OfferingServices
What BSI Constructors does
BSI Constructors is a St. Louis-based general contractor founded in December 1972 as Bannes-Shaughnessy, Inc. by Lorenz T. Bannes and Joseph F. Shaughnessy. The firm provides lump sum bidding, general contracting, construction management, and design-build services to institutional and quality-focused clients in the St. Louis metropolitan area and surrounding markets, completing over 1,300 projects with values ranging from $1 million to over $300 million. The company is wholly owned by the Shaughnessy family and has been profitable in 49 of its 50 years of operation, with a stated policy of prioritizing quality over volume and refusing to publish annual revenue figures.
The company's core offering is general contracting and construction management, supplemented by significant self-perform capabilities spanning structural concrete, architectural concrete, structural steel erection, miscellaneous metals installation, carpentry, specialties installation, selective demolition, hand excavation, and general debris removal. BSI maintains LEED Accredited Professionals on staff and was a pioneer in environmentally sensitive construction prior to the formal LEED program, completing LEED-certified buildings for clients including Washington University, Wells Fargo, St. Louis University, and the Missouri Botanical Garden. The firm also holds the OSHA Voluntary Protection Program Mobile Workforce STAR designation—the first general contractor in OSHA Region VII (Missouri, Iowa, Kansas, Nebraska) to do so—enabling self-policing safety authority and lower workers compensation costs.
BSI generates revenue through project-specific competitive bidding on construction contracts in its primary St. Louis metro market, defined as any location within a one-hour drive of its Southwest Avenue headquarters. Customers span education, government, cultural, healthcare/non-profit, senior living, religious, hospitality, retail, multifamily residential, recreation, and historic renovation sectors, with named clients including Washington University, St. Louis University, City of St. Louis, St. Louis Public Library, Wells Fargo, and the Missouri Botanical Garden. Distribution is exclusively through direct field sales and relationship-based referrals; the company states it has never sued or been sued by a client or architect in 50+ years. Long-tenured employees (18 with 25+ years of service) and a bonding capacity averaging twice annual volume over the last 20 years support the firm's financial stability. The company has also completed occasional out-of-market projects in Cape Girardeau, Springfield, Carbondale, Columbia/Jefferson City, Iowa, and the Cayman Islands at the request of existing clients.
BSI Constructors firmographics
Firmographics- Name
- BSI Constructors
- Legal name
- BSI Constructors, Inc.
- Website
- https://bsistl.com
- Company type
- Private
- Founded year
- 1972
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- BSI Constructors is a St. Louis-based general contractor founded in 1972 providing lump sum bidding, construction management, design-build, and self-perform services across 16 building categories to institutional clients in the St. Louis metro area, with over 1,300 completed projects and a 50+ year track record.
- Ownership category
- akta.pro rank
BSI Constructors industry classification
Industry- Product category
- Commercial Construction Services
- NAICS
- Commercial and Institutional Building Construction (23622), Nonresidential Building Construction (2362)
- SIC
- General Bldg Contractors - Nonresidential Bldgs (1540)
- akta.pro primary industry
- Office & Corporate Building Construction (IMAFACAA)
- akta.pro secondary industry
- Sports & Recreation Facility Construction (Stadiums, Arenas, Community Centers) (IMAFACAI)
Keywords
Where BSI Constructors is headquartered
LocationHeadquarters
- HQ city
- Saint Louis
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
BSI Constructors business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- General Contracting/Construction Management Services: Revenue is generated through construction contracts for projects ranging from $1 million to over $300 million. Projects are typically awarded through competitive bidding for both private and public sector clients in the St. Louis metro area and surrounding markets.
Go-to-market motion1 record
Distribution channels3 records
Marketing channels5 records
BSI Constructors product offering
Product offeringCore offering
BSI Constructors is a St. Louis-based general contractor providing lump sum bidding, general contracting, construction management, and design-build services across cultural, educational, office, research/laboratory, multifamily, senior living, religious, hospitality, healthcare, recreation, retail, parking, and historic renovation projects. The firm supplements its management services with self-perform construction capabilities in structural and architectural concrete, structural steel erection, miscellaneous metals, carpentry, specialty installations, selective demolition, hand excavation, and debris removal. Projects typically range from $1 million to over $300 million.
Product overview
BSI Constructors is a St. Louis-based general contractor and construction management firm offering comprehensive construction services across diverse building categories. The company's core offering is general contracting and construction management, supplemented by self-perform construction capabilities. Their specialized services include cultural, office, research/laboratory, multifamily residential, education, tenant buildout, senior living, religious, parks/trails/plazas, historic renovation, parking, hospitality, retail, recreation, and auditorium construction. BSI also offers green building and LEED construction services, having pioneered environmentally sensitive construction before LEED existed. Projects range from $1 million to over $300 million, with most work in the $3 million to $40 million range. The company was founded in 1972 and has completed over 1,300 projects.
Differentiator
Problem solved
Functional benefit
Products and services
- Cultural Construction Construction services for cultural facilities including museums, performing arts centers, and cultural institutions. Targeted at cultural organizations and institutions in the St. Louis metropolitan area and beyond.
- Office Construction Commercial office building construction and tenant improvements targeted at office-using enterprises, including LEED-certified office projects.
- Research & Laboratory Construction Construction of research facilities and laboratory buildings for scientific research purposes, targeted at universities, botanical gardens, and private-sector research organizations.
- Multifamily Construction Multi-family residential construction including apartment buildings and residential complexes targeted at private developers and institutional owners.
- Education Construction Construction services for educational institutions including schools, universities, and academic facilities. Targeted at K-12 districts and higher education institutions, including notable work for Washington University in St. Louis and St. Louis University.
- Tenant Buildout Interior buildout and renovation services for commercial tenant spaces, targeted at landlords, tenants, and property managers.
- Senior Living Construction Construction of senior living facilities including assisted living, independent living, and nursing care facilities, targeted at senior living operators and nonprofit providers such as Lutheran Senior Services.
- Religious Construction Construction and renovation services for religious institutions including churches, chapels, and spiritual centers, targeted at faith-based organizations.
- Parks, Trails and Plazas Construction Construction of public parks, recreational trails, urban plazas, and landscape architecture projects targeted at municipalities, foundations, and community developers.
- Historic Renovation Historic preservation, restoration, and adaptive reuse of historic buildings and landmarks, targeted at cultural institutions, municipalities, and private developers of landmark properties.
- Parking Construction Construction of parking structures and parking facilities targeted at institutions, municipalities, and commercial developers.
- Hospitality Construction Construction of hotels, resorts, and hospitality venues including historic hotel renovations, targeted at hotel developers and historic property redevelopers.
- Retail Construction Retail space construction and commercial building projects targeted at retail tenants, retail developers, and community retail redevelopers.
- Recreation Construction Recreation facility construction including gymnasiums, aquatic centers, fitness facilities, and sports venues, targeted at universities, municipalities, nonprofits, and recreation operators.
- Auditorium Construction Construction of auditoriums and performing arts venues targeted at cultural institutions, educational institutions, and performing arts organizations.
- Self-Perform Construction Trades Self-perform construction capabilities covering structural concrete, architectural concrete, structural steel erection, miscellaneous metals installation, carpentry, specialties installation, selective demolition, hand excavation, and general debris removal/cleanup, targeted at clients seeking reduced subcontractor dependence and direct schedule, cost, and craft quality control.
- LEED/Green Building Construction Sustainable/green building construction with LEED certification pursuit, incorporating environmentally sensitive construction practices and energy-efficient building methods, targeted at institutional and commercial clients pursuing LEED-certified or environmentally conscious buildings.
Quantifiable outcome
- Profitable in 49 of 50 years in business
- +3 more outcomes
Companies that use BSI Constructors
Customer profileNamed customers13 records
Segments3 records
Ideal customer profiles1 record
BSI Constructors technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
BSI Constructors partnerships and signals
Strategic signalScale indicators7 records
Recent moves8 records
Expansion highlights4 records
BSI Constructors competitors and assessment
Company assessmentDirect peers
- Tarlton Corporation: St. Louis-based general contractor and construction manager of comparable size and heritage, working on commercial, institutional, healthcare, and historic renovation projects across the metro — a near-direct comparable in geography, project type, and family-influenced culture.
- Kwame Building Group: St. Louis-based MBE construction management and general contracting firm with similar institutional, education, and public-sector client profile — comparable in scale and project type within the same metro.
- L. Keeley Construction: St. Louis-area general contractor with overlapping commercial, institutional, and infrastructure-adjacent work — comparable mid-sized regional peer competing for similar institutional clients.
- PARIC Corporation: St. Louis-based general contractor and construction manager serving commercial, healthcare, senior living, and education clients in the Midwest — directly comparable in regional scope and project categories.
- Brinkmann Constructors: St. Louis-headquartered general contractor serving commercial, multifamily, senior living, and hospitality sectors in the Midwest — directly comparable in project mix, scale, and regional footprint.
- Musick Construction: St. Louis-based general contractor working on commercial, institutional, and renovation projects in the metro — similar scale and project mix, competing directly with BSI for local institutional work.
- Holland Construction Services: St. Louis metro general contractor with overlapping institutional, healthcare, and education client base; competes directly with BSI on mid-sized commercial projects in the same one-hour drive geography.
Broad incumbents
- Clayco: St. Louis-headquartered design-build general contractor with significant commercial, industrial, and institutional work in the region — a broader incumbent that competes for many of the same institutional clients.
- Alberici Group: St. Louis-based construction services firm with a general contracting arm operating across commercial, healthcare, and institutional markets — overlaps with BSI's institutional client base but is materially larger and more diversified.
- McCarthy Building Companies: Larger St. Louis-headquartered national general contractor with overlapping institutional, healthcare, and education work — competes for the same marquee clients but operates at significantly greater scale and geographic breadth.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
BSI Constructors social profiles
Digital presenceBSI Constructors compliance and trust
Trust signalCompliance4 records
BSI Constructors financial estimates
Financial estimateRevenue estimate
Valuation estimate
BSI Constructors leadership team
Management profileNumber of profiles
Profiles6 records
BSI Constructors funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
BSI Constructors M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about BSI Constructors
What does BSI Constructors do?
BSI Constructors is a St. Louis-based general contractor providing lump sum bidding, general contracting, construction management, and design-build services across cultural, educational, office, research/laboratory, multifamily, senior living, religious, hospitality, healthcare, recreation, retail, parking, and historic renovation projects. The firm supplements its management services with self-perform construction capabilities in structural and architectural concrete, structural steel erection, miscellaneous metals, carpentry, specialty installations, selective demolition, hand excavation, and debris removal. Projects typically range from $1 million to over $300 million.
Is BSI Constructors a public or private company?
BSI Constructors is a private company. It is classified as family owned and is currently operating.
When was BSI Constructors founded?
BSI Constructors was founded in 1972. It employs 101 to 250 people.
Where is BSI Constructors based?
BSI Constructors is headquartered in Saint Louis, United States, in the North America region.
How does BSI Constructors make money?
One revenue line is on record: general Contracting/Construction Management Services.
Who are BSI Constructors's main competitors?
Direct peers on record are Tarlton Corporation, Kwame Building Group, L. Keeley Construction, PARIC Corporation, Brinkmann Constructors, Musick Construction and Holland Construction Services. Broad incumbents are Clayco, Alberici Group and McCarthy Building Companies.
Does BSI Constructors have an API?
No public API is recorded for BSI Constructors.
What industry is BSI Constructors in?
BSI Constructors's product category is Commercial Construction Services. Its primary akta.pro industry code is IMAFACAA, Office & Corporate Building Construction, with a secondary code of IMAFACAI, Sports & Recreation Facility Construction (Stadiums, Arenas, Community Centers). Its NAICS code is 23622 and its SIC code is 1540.