Software Toolbox


Access our collection of calculation tools to perform repetitive design tasks accurately and efficiently.

timbersizerPro EC5 edition

Select the most efficient timber cross-section for your design with this time-saving online software for engineers and architects. Using timber sizes readily available in the UK market, timbersizer suggests appropriate cross-sections based on timber strength classes C16 or C24, or joist depth. This allows you to specify the most appropriate timbers available, or ones that give the optimum floor/ceiling depth.


The timbersizer software service is regularly reviewed and updated to keep it abreast of any modifications and changes to the Eurocode standards. This helps you to ensure your designs are compliant with the latest codes.


timbersizerPro is free to full TRADA members.

timbersizerPro is available on a subscription basis to non-members of TRADA.

for more information and to
try timbersizer click here

timberconnectionsPro EC5 edition

Based on the Eurocodes 0, 1 and 5 and their UK National annexes, timberconnections is regularly reviewed and updated to keep abreast of any modifications and changes to the standards. The Improved online user interface means you can access the software from PC or Mac anytime, anywhere, making any updates immediately available.


Free to TRADA members, timberconnections calculates the load capacity of individual fasteners based on timber strength classes C16 or C24. You can calculate connection capacities with nails, screws, bolts dowels and coach screws in two and three member combinations of timber and steel.


timberconnectionsPro subscribers can customise and tweak all design parameters with advanced controls to define materials and characteristics for all timber classes in the range C14-D70. Custom PDF reports can be generated for building control requirements and includes minimum edge distances and fastener spacings parallel to and perpendicular to the grain for each member of the connection.


timberconnectionsPro is free to full TRADA members.

timberconnectionsPro is available on a subscription basis to non-members of TRADA.

for more information and to try
timberconnections click here

Previous BS-5268 versions

Please note that BS 5268 has now been withdrawn by BSI, and we are no longer maintaining this version of the software.

We can supply the following files to TRADA members for reference only:

Use of the software toolbox is subject to our Software Toolbox Terms and Conditions.


  • Timber sizer (Lite version 2.01)
  • Nail, screw, bolt and dowel connection designer (Lite version 2.04)
  • Coach screw connection designer (Lite version 2.1)
  • Flitch beam designer (Lite version 1.0)

Please note: these are in file formats which may not be immediately accessible. For this reason, assistance from your IT administrator may be required in order to download them. For further details, contact membership@trada.co.uk.