Spire Engineering
Spire Engineering is a Milwaukee-based, full-service structural engineering firm founded in 2009 that provides design, analysis, and consulting services across mass timber, concrete, steel, and wood construction to architects, developers, owners, and builders nationwide.
- Company typePrivate
- Founded2009
- HeadquartersMilwaukee, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Spire Engineering does
Spire Engineering, Inc. is a Milwaukee-based, full-service structural engineering firm founded in 2009 by Alan T. Rentmeester, PE. The firm delivers structural design, analysis, and engineering consulting for architects, developers, property owners, and builders across the country, with work spanning commercial, residential, educational, institutional, civic, and historic renovation projects. Core technical expertise covers multiple construction methods including mass timber, pre-cast concrete, post-tensioned concrete, steel, and wood, with the firm emphasizing economical, buildable, and constructable design solutions.
The company is privately held and led by a three-principal shareholder team: founder Alan T. Rentmeester, PE; Brian J. Rinke, PE, SE; and Brian J. Genduso, PE (the latter two joined as shareholders in 2020). Operations run from a single headquarters at 305 North Plankinton Avenue, Suite 101, Milwaukee, WI, with services delivered to national clients through direct engagement and professional network referrals.
Revenue is generated through project-based professional services fees, with custom quotes per project scope rather than published pricing. The go-to-market is enterprise field sales targeting architecture firms, real estate developers, property owners, and builders/contractors. Marketing relies on a project portfolio website, earned media through industry awards (20+ regional recognitions including multiple Mayor's Design Awards, AIA Wisconsin Honor Award, and CoStar Impact Award), and AEC industry referral networks. There is no external investment, no parent company, no disclosed headcount, no technology platform, and no AI/ML capability indicated in available data.
Spire Engineering firmographics
Firmographics- Name
- Spire Engineering
- Legal name
- Spire Engineering, Inc.
- Website
- https://spireengineer.com
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Spire Engineering is a Milwaukee-based, full-service structural engineering firm founded in 2009 that provides design, analysis, and consulting services across mass timber, concrete, steel, and wood construction to architects, developers, owners, and builders nationwide.
- Ownership category
- akta.pro rank
Spire Engineering industry classification
Industry- Product category
- Structural Engineering Services
- NAICS
- Engineering Services (541330), Engineering Services (54133)
- SIC
- Services-Engineering Services (8711)
- akta.pro primary industry
- Civil & Structural Engineering Consulting (BPAHAIAA)
- akta.pro secondary industry
- Construction Engineering & Constructability Consulting (BPAHAIAN)
Keywords
Where Spire Engineering is headquartered
LocationHeadquarters
- HQ city
- Milwaukee
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Spire Engineering business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales
Revenue model
- Structural Engineering Services: Professional engineering services billed on a project basis for structural design, engineering, and detailing services provided to architects, developers, owners, and builders.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels3 records
Spire Engineering product offering
Product offeringCore offering
Spire Engineering, Inc. is a full-service structural engineering consulting firm providing design, analysis, and engineering solutions for construction projects across residential, commercial, educational, and institutional sectors. The firm works across multiple construction materials and methods, including Mass Timber, Pre-Cast Concrete, Post-Tensioned Concrete, Steel, and Wood. Services are delivered on a project-by-project basis to architects, developers, owners, and builders nationwide from its Milwaukee headquarters.
Product overview
Spire Engineering is a full-service structural engineering firm offering engineering consulting services. The company provides structural design and engineering analysis across multiple construction types including mass timber, pre-cast concrete, post-tensioned concrete, steel, and wood construction. Their services are delivered to architects, developers, owners, and builders through project-based consulting work rather than a software product platform.
Differentiator
Problem solved
Functional benefit
Products and services
- Structural Engineering Services Full-service structural engineering consulting providing design, analysis, and engineering solutions for construction projects across residential, commercial, educational, and institutional sectors. The service covers multiple structural systems, including Mass Timber, Pre-Cast Concrete, Post-Tensioned Concrete, Steel, and Wood, and is delivered to architects, developers, owners, and builders nationwide from the firm's Milwaukee headquarters.
- Construction Engineering Engineering services focused on ease of constructability and economical design solutions for builders, developers, and contractors, providing field-ready structural designs for construction execution.
Companies that use Spire Engineering
Customer profileNamed customers6 records
Segments4 records
Ideal customer profiles4 records
Spire Engineering technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature2 records
Spire Engineering partnerships and signals
Strategic signalScale indicators1 record
Recent moves3 records
Expansion highlights4 records
Spire Engineering competitors and assessment
Company assessmentDirect peers
- KPFF Consulting Engineers: National structural and civil engineering consultancy delivering building design across materials including steel, concrete, mass timber, and wood. Spire is most directly comparable as a structural-engineering-led firm serving architects, developers, owners, and builders on commercial, residential, and institutional projects.
- Simpson Gumpertz & Heger (SGH): National engineering firm specializing in structural design, building enclosure, and existing-structure evaluation. Directly comparable to Spire's structural engineering focus, particularly in adaptive reuse and historic renovation work.
- Magnusson Klemencic Associates (MKA): Structural and civil engineering consultancy with deep expertise in concrete, steel, and mass timber building design. Comparable to Spire in its focus on creative, buildable structural solutions for complex commercial and institutional builds.
- Hammel, Green and Abrahamson (HGA): Integrated design firm combining architecture and engineering with structural design capabilities for cultural, educational, healthcare, and civic projects. Comparable to Spire in serving architects and developers on community-oriented building projects in the Midwest.
- Pierce Engineers: Mid-size structural engineering consultancy serving architects, developers, and owners with a focus on practical, buildable designs. Closely comparable to Spire in scale, service mix, and emphasis on constructability and economy for commercial and residential projects.
- Wiss Janney Elstner Associates (WJE): Engineering firm focused on structural analysis, preservation, and repair of existing and new buildings. Comparable to Spire in deep structural-engineering expertise especially for historic renovation and complex rehabilitation projects.
Broad incumbents
- WSP: Global professional services firm with a large structural engineering practice embedded in buildings, transportation, and property markets. Comparable to Spire through its structural engineering service line but operates at much larger scale with broader integrated offerings.
- Thornton Tomasetti: Global engineering consultancy with a strong structural engineering practice serving complex building, infrastructure, and renovation projects. Comparable to Spire in core structural design offering but with significantly broader multidisciplinary and analytical capabilities.
- Arup: Global engineering and design firm with extensive structural engineering practice for buildings and infrastructure. Comparable to Spire in core structural services but with much broader multidisciplinary capability and geographic reach.
- Burns & McDonnell: Engineering, construction, and architecture firm with significant building and infrastructure structural engineering capabilities. Comparable to Spire as a structural services provider for commercial and institutional clients, though at substantially larger scale.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat3 records
Key risks6 records
Key highlights6 records
Customer concentration
Spire Engineering social profiles
Digital presenceSpire Engineering financial estimates
Financial estimateRevenue estimate
Valuation estimate
Spire Engineering leadership team
Management profileNumber of profiles
Profiles3 records
Spire Engineering funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Spire Engineering 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 Spire Engineering
What does Spire Engineering do?
Spire Engineering, Inc. is a full-service structural engineering consulting firm providing design, analysis, and engineering solutions for construction projects across residential, commercial, educational, and institutional sectors. The firm works across multiple construction materials and methods, including Mass Timber, Pre-Cast Concrete, Post-Tensioned Concrete, Steel, and Wood. Services are delivered on a project-by-project basis to architects, developers, owners, and builders nationwide from its Milwaukee headquarters.
Is Spire Engineering a public or private company?
Spire Engineering is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Spire Engineering founded?
Spire Engineering was founded in 2009. It employs 11 to 50 people.
Where is Spire Engineering based?
Spire Engineering is headquartered in Milwaukee, United States, in the North America region.
How does Spire Engineering make money?
One revenue line is on record: structural Engineering Services.
Who are Spire Engineering's main competitors?
Direct peers on record are KPFF Consulting Engineers, Simpson Gumpertz & Heger (SGH), Magnusson Klemencic Associates (MKA), Hammel, Green and Abrahamson (HGA), Pierce Engineers and Wiss Janney Elstner Associates (WJE). Broad incumbents are WSP, Thornton Tomasetti, Arup and Burns & McDonnell.
Does Spire Engineering have an API?
No public API is recorded for Spire Engineering.
What industry is Spire Engineering in?
Spire Engineering's product category is Structural Engineering Services. Its primary akta.pro industry code is BPAHAIAA, Civil & Structural Engineering Consulting, with a secondary code of BPAHAIAN, Construction Engineering & Constructability Consulting. Its NAICS code is 541330 and its SIC code is 8711.