Concrete Window Sills

Precast concrete sills (also known as cills) are used below windows, ledges and transitions, and can even be used as architectural accents. We have a range of non-stooled sills available from stock and can also manufacture bespoke sills to your exact specification.

Building Tech Specs Contact Us

What is a precast concrete window sill?

An important structural and aesthetic element of any building, a precast concrete window sill keeps rainwater away from the window frame and offers support to the window itself. Sloped to direct water away from the window, a drip channel on the underside prevents water running down and staining the exterior wall of a building.

Used on commercial developments as well as residential housing projects, our concrete sills are precast in a range of standard sizes allowing for easy installation while on site. Bespoke sills can also be precast for one off dwellings or renovation projects.

Available sizes of window sill

These are available in either 200mm or 250mm wide and in an extensive selection of lengths. We also manufacture window sills stooled in a heavy-duty section, 200 wide x 140 – 100mm high as left-hand or right-hand stooled sections or non-stooled centre sections.

What are stooled window sills?

What the exterior of the building is constructed from will determine whether you require stooled or non-stooled window sills.

Stooled window sills are used when the property has an exposed brickwork finish. Stooling allows the brickwork to sit flush on what would otherwise be a sloped sill. For most other finishes, a sill without stooling will be used. This will generally extended beyond the window opening.

Product CodeWidth (mm)Length (mm)Height (mm)
Sill Non-Stooled
Also available in simulated stone
S260020060075
S275020075075
S290020090075
S21050200105075
S21200200120075
S21350200135075
S21500200150075
S21800200180075
S2560025060075
S2575025075075
S2590025090075
S251050250105075
S251200250120075
S251350250135075
S251500250150075
S251800250180075
SE0550R200550140
SE0775R200775140
SE1000R2001000140
SE1225R2001225140
SE1338R2001338140
SE1450R2001450140
SE1675R2001675140
Left-hand Stooled
SE0550L200550140
SE0775L200775140
SE1000L2001000140
SE1225L2001225140
SE1338L2001338140
SE1450L2001450140
SE1675L2001450140
Centre Non-Stooled
SE0450C200450140
SE0675C200675140
SE0900C200900140
SE1125C2001125140
SE1238C2001238140
SE1350C2001350140
SE1575C2001575140

Concrete sill finishes

We have a range of non-stooled sills available from stock in natural grey. They can also be cast in white or buff colour wet cast concrete. Depending on your requirements we can provide a fair face (smooth) or acid etch (lightly textured) finish if required.

Bespoke concrete window sills

We can of course manufacture bespoke window sills to your exact size.

For all our sizes and product drawings, please view our building technical specifications or call us on 020 8687 2222.

Need some advice? Talk to our expert team

Allen Concrete
Surrey

36 - 38 Willow Lane
Mitcham
Surrey
CR4 4NA

  020 8687 2222

Northants

35 - 37 Rixon Road
Wellingborough
Northants
NN8 4BA

  01933 276848