We can take care of part or the whole process from start to finish of you would like, from Technical Consultation, Quotation, Manufacture, Installation and Aftercare.

Download Procter Cast Stone Free literature including product and service brochures; case studies to show different applications and cast stone from Procter’s vast experiences.

Cast Stone Window & Door Mullions

Window mullions are a structural element which divide two or more adjacent windows and have been used for many centuries with their first appearance in European architectural being in the 12th century. As a key architectural element, mullions are still popular today and can be seen in many contemporary buildings.

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Standard range

Our range of cast stone mullions is compatible with many different window types such as timber, aluminium and UPVC.

Both traditional and more contemporary designs, and all are available in a wide choice of stone colours.  The standard range of cast stone mullions is suitable for many new build and self-build projects, with renovations projects typically requiring bespoke cast stone mullions.

For many new build or renovation projects it is possible to produce bespoke mullions matched to a specific design, including the careful reproduction of existing original sections for historic buildings.

This is something we’re easily able to do, and will produce an end result which will resemble natural stone mullions very closely.


  • Our cast stone products exceed BS:1217 standards
  • Available in 6 colours
  • Bespoke or matched colours upon request
  • Bespoke designs
  • All products manufactured using the very latest vapour curing technology
  • Choose from an extensive catalogue of standard designs
  • In-house installation service available for certain products/projects
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Technical consultation


Installation services


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