Calculated Structured Designs

What Calculated Structured Designs does

Calculated Structured Designs Inc. (CSD) is a Calgary-based software development company, founded in 2009, that built the iStruct Suite — an integrated set of structural design and engineering applications serving residential and light commercial construction markets in North America and Australia. The suite comprises five registered-software modules: isDesign (single member sizing), isOptimize (engineered wood product optimization and cutting), isWall (tall wall design), isPlan (layout, design and structural analysis), and isDesignCenter (project management for design teams). All five modules share common data — product availability, pricing, templates, and customer data — enabling cross-application workflow continuity for structural engineers, design professionals, and builders.

The company's core technology is deterministic structural-engineering computation and optimization software wrapped in a unified data layer, with no disclosed AI/ML components. Its business model is software licensing/subscription revenue, sold through two channels: (1) direct enterprise field sales via Simpson Strong-Tie representatives (the company was acquired by Simpson Strong-Tie Company, Inc., making CSD a wholly-owned subsidiary), and (2) the CSD Portal online store at csdportal.com. Pricing is not publicly disclosed. The target customer segments are design professionals, structural engineers, and builders in the engineered wood, structural products, and light commercial construction industries.

CSD operates as a small specialist team (1-10 employees) within Simpson Strong-Tie's digital solutions portfolio. The acquisition, which has no publicly disclosed date or terms, integrated iStruct into Simpson's structural product portfolio and gave the software access to Simpson's enterprise sales channel. As a result, CSD's go-to-market, brand, and product roadmap are now nested within Simpson Strong-Tie's broader structural solutions strategy rather than operating as an independent software vendor.

Name

Calculated Structured Designs

Legal name

Calculated Structured Designs Inc.

Website

https://csdsoftware.com

Company type

Private

Founded year

2009

Operating status

Acquired

Headcount range

1–10 employees

Short description

Calgary-based Calculated Structured Designs (now a Simpson Strong-Tie subsidiary) provides the iStruct Suite — an integrated set of structural design, EWP optimization, and project management applications for residential and light commercial construction across North America and Australia.

Ownership category

akta.pro rank

Product category

Structural Engineering Software

NAICS

Engineering Services (541330), Drafting Services (541340)

SIC

Services-Engineering Services (8711), Services-Computer Programming Services (7371)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industry

Engineering design services (line design, substation design, civil/structural) (EUADAKAG)

Keywords

• Structural design software
• Engineered wood software
• Construction design tools
• EWP optimization software
• Structural member sizing

Headquarters

HQ city

Calgary

HQ country

Canada

HQ region

North America

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. Software Licenses/Subscriptions: Software application suite providing design, specification, and delivery tools for structural products. Applications seamlessly integrate to share common features like product availability, pricing, templates and customer data.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels1 record

Core offering

Calculated Structured Designs develops and sells the iStruct Suite, an integrated application suite for the design, specification, and delivery of structural products in residential and light commercial construction. The suite comprises five software modules—single member sizing (isDesign), EWP optimization and cutting (isOptimize), tall wall design (isWall), layout/design/structural analysis (isPlan), and design team project management (isDesignCenter)—that share common features such as product availability, pricing, templates, and customer data to streamline structural engineering workflows for design professionals and builders.

Product overview

Calculated Structured Designs (CSD) offers the iStruct Suite, a unified platform of integrated applications for the engineered wood, engineering, design, and building industries. The suite includes isDesign (single member sizing software), isOptimize (EWP optimization and cutting software), isWall (tall wall design), isPlan (layout, design and structural analysis), and isDesignCenter (project management for design teams). These applications share common features including product availability, pricing, templates, and customer data, making it easier to deliver consistent results with less effort for residential and light commercial construction projects across North America and Australia.

Differentiator

Problem solved

Functional benefit

Brands

• iStruct Suite: An application suite that serves as an essential tool for the design, specification and delivery of structural products in residential and light commercial construction. Applications include isDesign® (Single Member Sizing Software), isOptimize® (EWP Optimization and Cutting Software), isWall® (Tall Wall Design), isPlan® (Layout, Design and Structural Analysis), and isDesignCenter® (Project Management Software for Design Teams).
• isDesign®
• isOptimize®
• isWall®
• isPlan®
• isDesignCenter®

Products and services

• iStruct Suite Integrated application suite serving as an essential tool for the design, specification, and delivery of structural products in residential and light commercial construction, with modules that seamlessly integrate to share product availability, pricing, templates, and customer data for design professionals, structural engineers, and builders.
• isDesign Single Member Sizing Software Single member sizing software for structural member design calculations, used by structural engineers and design professionals.
• isOptimize EWP Optimization and Cutting Software Engineered Wood Products (EWP) optimization and cutting software for efficient material use and cost reduction in residential and light commercial construction.
• isWall Tall Wall Design Tall wall structural design application for structural engineering of tall walls in residential and light commercial construction projects.
• isPlan Layout, Design and Structural Analysis Layout, design, and structural analysis application for planning and analyzing structural elements in residential and light commercial construction projects.
• isDesignCenter Project Management Software for Design Teams Project management software designed for design teams to coordinate structural product design, specification, and delivery workflows.

Quantifiable outcome

• Increased efficiencies and cost and time savings

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Simpson Strong-TiecoreStrategic or Co-development PartnerSimpson Strong-Tie acquired Calculated Structured Designs Inc. (CSD®), integrating the CSD software suite into their digital solutions portfolio. The acquisition brings together CSD's software development expertise for the engineered wood, engineering, design, and building industries with Simpson Strong-Tie's structural product portfolio.

Scale indicators1 record

Recent moves4 records

Expansion highlights4 records

Broad incumbents

• Trimble: Trimble's Tekla Structures and related AEC software cover structural BIM, detailing, and analysis for wood, steel, and concrete. Tekla competes with iStruct in structural modeling and analysis workflows that structural designers and engineers rely on for residential and commercial framing.
• Nemetschek Group: Nemetschek's portfolio (SCIA Engineer, Allplan, Vectorworks) addresses structural analysis and multi-discipline BIM design. SCIA Engineer is a direct functional competitor to iStruct's structural analysis capabilities for the same engineering buyer.
• Autodesk: Autodesk's Revit and Robot Structural Analysis Professional are widely deployed BIM and structural design platforms used by architects and engineers. As a broad incumbent, Autodesk competes with iStruct at the workflow level across the same residential and light commercial design customer base.

Direct peers

• Boise Cascade: Boise Cascade operates an EWP business and offers Forte design software, an integrated suite for structural framing, truss, and panel design. Forte directly overlaps with iStruct's iDesign, isOptimize, and isWall modules in serving residential EWP designers.
• RISA Tech: RISA Tech (now part of Nemetschek) produces RISA-3D, RISA-2D, and RISAFloor for structural analysis and design, including wood member design. It is a direct functional peer to isPlan and isDesign for engineers performing structural analysis on residential and light commercial projects.
• Weyerhaeuser: Weyerhaeuser's iLevel / Trus Joist brand sells EWP and historically offered design software for specifiers and dealers. It competes with iStruct in the same customer workflows around engineered wood member sizing and project specification in residential construction.
• MiTek Industries: MiTek (owned by Berkshire Hathaway) develops structural design and EWP layout software (e.g., MiTek SAPPHIRE) used by truss and wall panel manufacturers. It is the closest direct peer to iStruct, competing head-to-head in engineered-wood member sizing and optimization for residential and light commercial construction.

Emerging players

• StrucSoft Solutions: StrucSoft builds MWF (Metal Wood Framer) and related Revit-based framing automation tools for wood and light-gauge steel. It targets the same residential and light commercial framing designers as iStruct, focused on automated layout and shop drawing generation within BIM.
• ClearCalcs: ClearCalcs is a cloud-based structural engineering calculator platform used by residential and commercial structural engineers. It overlaps with iStruct's structural analysis and member sizing use cases via a modern SaaS delivery model, targeting the same design professional buyer.
• Dlubal Software: Dlubal provides RFEM and RSTAB structural analysis and design software with strong timber-design capabilities. It competes with iStruct for engineers performing wood structural analysis and member design across residential, commercial, and industrial projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/csdinfo
• Facebookfacebook.com/CalculatedStructuredDesign

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Calculated Structured Designs