Window cill end caps
Replacement uPVC cill end caps for a clean, professional finish on external window sills. 150mm width to fit the standard Eurocell uPVC cill profile — the most widely used in UK window installations. Sold in pairs (left and right) so you get everything needed to finish a single cill. Snap-fit design, UV-stable white.
How to fit cill end caps
Push the end cap onto the exposed end of the cill profile until it clicks into place. For a more permanent fit, apply a bead of clear silicone or uPVC solvent cement inside the cap before fitting. Left and right caps are mirror images — check orientation before pushing on. Cill end caps are profile-specific: our 150mm caps fit Eurocell profiles. Other manufacturers (Swish, Kestrel) have slightly different profiles — check your cill brand before ordering.
Trade Tip
Finishing tip: Apply a small bead of silicone sealant inside the end cap before pressing it onto the cill. This prevents water tracking behind the cap and locks it in place permanently. A clean line of sealant around the outside edge completes a watertight, professional finish.
Frequently Asked Questions
What size cill end caps do I need?
Measure the depth (front to back) of your external cill. Our 150mm caps fit the standard Eurocell 150mm profile — the most common in UK installations.
Are cill end caps universal?
No — they are profile-specific. Each manufacturer (Eurocell, Swish, Kestrel) has a slightly different shape. Our caps are designed for the Eurocell 150mm profile.
Can I replace just one end cap?
Our packs contain a pair (left + right). If only one end is damaged, you'll have a spare for the other side or future use.
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Eurocell 150mm Window Cill End Caps White – Pair | uPVC Sill End Caps
Regular price From £5.24 GBPRegular price
