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.

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Cast Stone Window Cills

An external window or door cill (or sill) is sited at the bottom of the window or door aperture, projecting out and diverting rainwater away from the property. Cills are primarily functional features of a building façade but can also be decorative or made into more of an aesthetic feature, particularly on properties with many windows.

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Our in-house manufactured cast stone sills for windows, including bay windows, come in various colours and are available in either standard or bespoke profiles. We have a large stock of standard-sized cills ready for immediate delivery, or we can quote on one-off cill projects with custom dimensions. All our stone cills exceed BS:1217 Standards.

There are three main types of cast stone window cill you may consider:

  • Slip cills are often the choice for use on walls which are to be rendered. Cast stone slip cills can be “slipped” into position between the Jambs or main horizontal parts of a window frame. They can be fitted into a gap, or built into a wall during the construction phase. Our cast stone slip cills are available in standard stock sizes of 1200x140x150mm and 785x65x150mm/sash windows.
  • Cast stone stooled cills have a stooling at either side of the window aperture, which is built into the brickwork at the time of construction, providing a flat and level surface for the bricks or side jambs such as in a traditional mullion window surround. This type of cill offers a more traditional look. Stooled cills are available with either 100mm or 150mm stools. Cills over 1200mm are generally supplied in two pieces.
  • Bay sills are designed for bay windows but are commonly used in conservatories, orangeries or garden offices. Cast stone bay sills are manufactured to the specific site requirements, such as square or curved.

If you’re not sure which type of window cill you need, have a look through some of our helpful resources and guides to using cast stone products which may give you some ideas. Alternatively, talk to your builder or architect, or get in touch with our expert team for advice.

Benefits of Choosing a Procter Cast Stone Window Cills

Quality guaranteed: All our cast stone cills & slip cills exceed BS:1217 standards relating to the performance requirements of cast stone. Procter is one of only six manufacturers in the UK to use the latest vapour curing technology for enhanced long-term structural integrity, durability and appearance.

Cutting edge technology: We use a 5-Axis CNC Machine in our stone cill manufacturing process. This cutting-edge technology enables us to use our design expertise to develop an unparalleled range of complex cill shapes, profiles and design details, to make virtually any architectural stone profile.

Wide choice of standard stone cill colours and styles: Our standard stone window cill stock is available in six colours and a wide variety of styles, from highly ornate and decorative to strong and striking.

Bespoke design available upon request: For large-scale projects or renovation projects where it is essential to match the style and colour of the property’s original features, we offer a bespoke service, producing items that exactly match your specification.

In-house installation service: As part of our complete turn-key service, our in-house team will take care of installing your cast stone cills, ensuring you don’t need to deal with additional contractors and that only trained experts handle these specialist products.

Ready to get a stone cill quote?

If you’re ready to place an order or talk to our expert team about your project requirements, get in touch today by filling in our online form or calling +44 (0)113 286 3329. Still have questions? Find out more about our manufacture, installation and aftercare services here.

Whether you’re renovating a period property or mansion, working on a commercial building or significant development, or simply looking to add a little class and style to your new-build or self-build project, Procter cast stone projects are suitable for any property.

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