To assist with ‘what if’ design scenarios PermCalc is our free to use proprietary software package that generates permeable pavement design suggestions from your individual input of data. Whether designing from first principles, or checking existing designs, using PermCalc when specifying saves you time, making multiple variables easy to produce and compare.

If you’re using permeable paving options, durable kerb systems, or everything in between, our product experts at Brett can offer expert support on design and detailing to remove risk and help you achieve the very best results.

Discover more with Brett

We’ve divided our site into six important categories. Click on each category to find our more.

Brett PermCalc Roadmap

From costing tool bolt-ons to road base options, our Brett PermCalc Roadmap walks you through everything you expect from our PermCalc software when procuring your next project.

Get Your Free Brett PermCalc Roadmap Now! Simply Fill in the Form Below

CPD seminars

Online or in-person CPD presentations to help you build on your skills and achieve points towards your annual requirements.

CPD seminars:

  • SuDS and the Role of Permeable Paving
  • PermCalc – Permeable paving design software

Online Tools

Get the most out of your designs and brings your plans to life with our online procurement tools.

Online Tools:


Permeable paving insights, landscape design inspiration and more. Read our blog to discover more:

SuDS Articles:

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