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Slip Cills (Slip Sills) – Reconstituted Stone Window Slip Cills
Our slip cills (also called slip sills) are precision-cast in high-quality reconstituted stone to provide a strong and attractive finish for window installations. Ideal for both residential and commercial projects, these window slip cills offer excellent water runoff with a sloping face and integrated drip groove, protecting masonry from moisture damage.
These reconstituted stone slip cills are compatible with our stooled cills and bay window sills, making them perfect for creating longer window cills or bespoke bay window details. Available in Bath Stone Buff (with other colours on request), these slip cills are ready for rapid delivery across the UK.
Stock Slip Cill in Bathstone buff colour
Slip Cill Dimensions
2026 Stock Stone Prices (Trade)
| Length | excl. VAT | incl. VAT |
|---|---|---|
| 1115mm | £131.65 | £157.98 |
Product Overview and Specification
- Availability, usually just 2 to 4 working days from payment
- Stooled Cills, Bay Windows and Render Cills also available
- Option for ex-stock collection from ST3 5BL on commercial vehicles; or nationwide delivery can be arranged at additional cost
- Suitable for timber frame or conventional brick and block construction
- Components manufactured with through coloured cast stone mix allowing for easier cutting to length on site
- Stock components supplied in Bathstone buff colour
- Additional colours produced on made to order basis (click here)
- Reproduction of product colour is as close as is possible within the limits of photographic technology
Slip Cills can be used as a central section for our two-piece Stooled Stone Cills to create longer unit lengths or fitted alongside our angle blocks to easily create Bay Window details. Produced from dry-cast concrete in Bath Stone colour, they complement most brick shades. These slip cills are STOCK items enabling rapid turnarounds and are frequently used together with our matching Stock Window Heads and Stone Quoins by Professional Builders, Self Builders and Developers.
Our stock concrete slip sills have a sloping face to assist with water run-off and benefit from a drip grove to the underside helping rain water drip away from the sill edge and also from the property walls. Other lengths can be supplied but 1115mm is the stock size, casting bespoke slip cill lengths can take around 6 weeks.
We deliver across the UK, and for really Urgent jobs Same Day Collection of concrete slip sills is sometimes available.
