The Fastest Growing Platform for Timber Specification
The Complete Timber Engineering Toolkit
for Specifiers in Australia & New Zealand.
Handle mass timber, light-frame, fasteners, and acoustics instantly. From CLT floors and flexible supports to complex acoustic performance, design everything without the technical bottlenecks.
Trusted By Engineers & Suppliers
What's New
Join The Community Discussion
SPEC Toolbox Community
Connect with other mass timber enthusiasts.
Interact with the Toolbox team on our product roadmap.
Be the first to here about upcoming webinars
Recent Product Updates
Release 2.1.10 New Composite Systems: Timber-Concrete Composites & Ribbed Deck Calculators.
Release 2.1.1 – CLT to Steel Beam Connection Details, Dowel/Bolt Updates, Screw Filtering & More!
Release 2.1.3 – Focus on Perpendicular to Grain Compression
Release 2.1.4 – Fire Design!
Release 2.1.5 – New Bracket Calculator Category
Release 2.1.6 – Major Updates & New National Annexes
Release 2.1.7 – Screw Connections
Release 2.1.8 – Analysis & One Page Summaries!
SPEC Toolbox Release!
Our latest Blogs
Explore our newest insights, updates, and expert takes on timber design, engineering, and sustainability.
Design of Steel-to-Timber Dowel/Bolt Connections Under Combined Loading to Eurocode 5
Steel-to-timber dowel and bolt connections look simple on drawings, but these joints are where “clean” global actions become messy local...
SPEC Toolbox Raises $3M to Automate Specs and Bridge the Supplier-Designer Gap
MELBOURNE, Australia: SPEC Toolbox (formerly CLT Toolbox), the construction technology platform automating complex engineering for sustainable building materials, has successfully...
Hydrogen embrittlement
As mass timber construction continues to gain prominence in the building industry, driven by its sustainability credentials and structural capabilities,...
Ribbed Deck Complete Design Guide for Engineers
Why This Ribbed Deck Blog Matters Ribbed decks are an innovative solution in modern timber construction, offering a combination of...
Timber-Concrete Composite (TCC) Floors: Design Overview and Key Considerations
Introduction to Timber-Concrete Composite Floors Timber–concrete composite (TCC) floors combine cross-laminated timber and a concrete slab using shear connectors, allowing...
CLT Toolbox rebrands to SPEC Toolbox
CLT Toolbox is now SPEC Toolbox Go To The App MELBOURNE, AUSTRALIA – September 3, 2025 – SPEC Toolbox, a...
Reaching The Potential Via The Testing of Screws
What are ETAs and ICC-ESRs? When it comes to building with timber, choosing the right fasteners is crucial for ensuring...
Design of CLT Beams
Due to its characteristic geometry and build-up, cross laminated timber has very versatile structural applications. It can be loaded perpendicular...
CLT Toolbox Grants Free Pro Access to University Students for Sustainable Timber Engineering
In a landmark move to accelerate the future of sustainable construction, CLT Toolbox today announced an unprecedented global education initiative....
CLT Compression Perpendicular to Grain Calculator: Design Considerations and Load/Support Location Effects
Understanding the Challenge CLT consists of multiple layers of timber stacked in alternating directions. The grains run parallel to their...
Your Direct Link to the ANZ Supply Chain
- Access leading Australian, New Zealand & European suppliers alongside standardized grades.
- Instantly switch suppliers to optimize your design.
- Ensure your design can actually be procured and built locally.
Automate Structural Design. Reclaim Your Time
- Turn days of manual crunching into minutes of automated analysis.
- Calculate timber structures and acoustic performance in one place using local standards.
- Iterate instantly without rebuilding complex spreadsheets.
- Free up your time for actual engineering.
Not A Black Box
- Verify every step with transparent, easy-to-follow Eurocode calculations.
- Visualize flexible support configurations, including cantilevers, instantly.
- Understand your inputs with built-in, contextual education.
Our Partner Updates
The Fastest Growing Platform for Timber Specification
Testimonials
Hear from the engineers, educators, and students who are using SPEC Toolbox to transform the way they build.
“The SPEC Toolbox is an essential piece of software for any organization working with mass timber. It provides efficient workflows for design areas that need to synthesize local and overseas codes, it greatly assists with managing QA and also serves
…
“The SPEC Toolbox is an essential piece of software for any organization working with mass timber. It provides efficient workflows for design areas that need to synthesize local and overseas codes, it greatly assists with managing QA and also serves as a solid educational tool for training new team members. The team at SPEC Toolbox have delivered an app that the market really needs”
Robbie Svars
General Manager
SPEC toolbox has helped simplify the organization and transparency of engineering calculations by providing a ‘once stop shop’ for all relevant designs. I like the explanations attached to some of the calculations which is a big bonus for the younger
…
SPEC toolbox has helped simplify the organization and transparency of engineering calculations by providing a ‘once stop shop’ for all relevant designs. I like the explanations attached to some of the calculations which is a big bonus for the younger engineers learning the ropes, which in turn takes gives some time back to the senior engineers not having to repeat the same concepts over. I think its an important tool to breaking down the barriers of Mass Timber design which historically has had a varied approach within the industry.
Matthew Burke
Structural Engineer
Having started with timber engineering more than 20 years ago and delivered structures in Europe, Asia and finally in Australia the process of getting designs valuated and approved by local authorities has been a challenge. Timeframes blowing out in the
…
Having started with timber engineering more than 20 years ago and delivered structures in Europe, Asia and finally in Australia the process of getting designs valuated and approved by local authorities has been a challenge. Timeframes blowing out in the process. SPEC Toolbox has streamlined the design and documentation making it easy to refer to the correct clause in the required standard. It also helps us immensely when comparing different supplier’s materials and assessing like for like solutions. SPEC Toolbox is easy to use, adjustable input for any supplier and has clear explanation for certifier/authorities.
Bernhard Waschl
Director
Engineers – Access For FREE
Explore our newest insights, updates, and expert takes on timber design, engineering, and sustainability.
FREE
$0
For individuals and small teams starting their journey.
The free version give you access to:
- Access to basic CLT with supply chain
- Access to basic GLT with supply chain.
- Core screw calculation module
- Hangers design module
- Access to free-tier supply chain partners
- Collaboration tools (share & chat)
- Simple PDF report printing
- Multi-language support
PRO
$2500 AUD/LICENSE YEARLY
$750 AUD/QUARTERLY
Everything in the free version plus:
- Advanced CLT design with full supply chain integration
- Advanced GLT design with full supply chain integration
- Light-frame construction modules
- Advances connection design (dowels, nails, screw details)
- Access to Pro-tier supply chain partners
- Manuel input flexibility for all calculations
- Ability to add custom suppliers and material grades
- Project and calculation duplication features
- Regional design code flexibility
- Extended PDF report printing and customization
ENTERPRISE
$X
For companies looking for multiple license deals across their company.
Everything in the pro version plus:
- Unlimited pro licenses for your company
- Advanced user management and project sharing
- Unlimited technical support
- Dedicated onboarding and training options
- Significant license discounts
FREE
$0
For individuals and small teams starting their journey.
The free version give you access to:
- Access to basic CLT with supply chain
- Access to basic GLT with supply chain.
- Core screw calculation module
- Hangers design module
- Access to free-tier supply chain partners
- Collaboration tools (share & chat)
- Simple PDF report printing
- Multi-language support
PRO
$2500 AUD/LICENSE
$750 AUD/QUARTERLY
For structural engineers looking to design with mass timber. The pro version gives access to:
Everything in the free version plus:
- Advanced CLT design with full supply chain integration
- Advanced GLT design with full supply chain integration
- Light-frame construction modules
- Advances connection design (dowels, nails, screw details)
- Access to Pro-tier supply chain partners
- Manuel input flexibility for all calculations
- Ability to add custom suppliers and material grades
- Project and calculation duplication features
- Regional design code flexibility
- Extended PDF report printing and customization
20% discount sponsored by:
Just email us your TDS (ENZ) membership number and we’ll give you the discount.
ENTERPRISE
$X
For companies looking for multiple license deals across their company.
Everything in the pro version plus:
- Unlimited pro licenses for your company
- Advanced user management and project sharing
- Unlimited technical support
- Dedicated onboarding and training options
- Significant license discounts
Dowels