🏭 Manufactured in Dublin. Delivered Nationwide.

Stop Guessing Your Window Sill Sizes Measure. Order. Done.

Name: Aluminium Window Sills
Brand: Cills.ie
Availability: InStock
Rating: 4.9 (127 reviews)

Every aluminium window sill is cut to your exact dimensions and powder coated in your chosen RAL colour. No templates. No site visits. No silicone patches. Just precision sills that fit first time.

3-5 day turnaround Made in Dublin Trusted by 1,000+ contractors Free delivery over €150

Start Your Order See Full Specs on Cills.ie

CILLS app showing guided digital measurement interface for ordering made-to-measure aluminium window sills in Ireland

Silicone is not a building material

If your sills need silicone to fill gaps, they were measured wrong. CILLS eliminates guesswork with guided digital measuring, so every sill fits tight against the frame with no patches, no rework, and no failed inspections on EWI projects.

Why Aluminium Window Sills Are the Standard in Ireland

Aluminium window sills have replaced concrete, timber, and stone as the preferred sill material on Irish construction projects. They resist Irish weather without cracking, warping, or staining. They require no painting or maintenance. And they hold their colour and shape for 30+ years.

Every sill from Cills.ie is manufactured from 2mm marine-grade aluminium, formed to your exact width and projection, and powder coated in a controlled factory environment.

Straight sills, bay sills, and deep projection sills
Formed end returns, stop ends, or open ends
Projections from 50mm to 400mm for EWI
Full RAL Classic colour range
Welded end caps for a sealed, permanent finish
No minimum order. Free delivery over €150.

Made-to-measure aluminium window sills with guided digital measurement for Irish construction projects

Welded End Caps and Upstands

Premium sill detailing that prevents water ingress and delivers a clean architectural finish.

Welded End Caps

Factory-welded end caps create a fully sealed sill end that prevents water tracking behind the sill and into the wall. Unlike bonded or silicone-sealed stop ends, welded caps will not separate over time. They provide a permanent, maintenance-free solution that holds up in coastal and exposed locations.

Welded Upstands

Welded upstands form a raised lip along the back edge of the sill, creating a positive seal against the window frame or cladding. This prevents water from running behind the sill at the frame junction. Essential on exposed elevations and deep insulation build-ups where water pressure is highest.

Where Aluminium Window Sills Are Used

New Build Residential

Specified at design stage for timber frame, block, ICF, and steel frame homes across Ireland.

Retrofit and Renovation

Replacement sills for existing openings. No modification to reveals needed.

External Wall Insulation

Deep projection sills covering full insulation depth plus overhang. The most common sill type we supply.

Passive House and NZEB

Precision sills for thermal envelope continuity at window junctions.

Commercial and Multi-Unit

Volume supply with batch consistency for apartments, offices, schools, and public buildings.

SEAI Grant Projects

Compatible with SEAI-funded energy upgrade works. Meets required finish and performance standards.

Order Aluminium Window Sills

Enter your dimensions, choose your colour, and get an instant price. Manufactured in Dublin with 3-5 day turnaround and nationwide delivery.

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