Cills.ie: Ireland's Specialist Supplier of Aluminium Window Cills — What You Need to Know
A Specialist Born from a Clear Market Need
Ask any Irish builder, architect, or homeowner what's difficult about sourcing window cills for a new build or retrofit project, and they'll likely tell you the same thing: lead times are long, standard profiles don't always fit, colour matching is inconsistent, and many builders' merchants don't stock aluminium cills, cappings, or trims as standalone products. Cills.ie was built to solve exactly that problem.
As a dedicated Irish specialist in aluminium window cills, window sills, parapet cappings, and external trims, Cills.ie has developed a focused product range and a supply model designed around the realities of the Irish construction and retrofit market. Rather than being one product line among thousands in a large merchant, aluminium cills and associated aluminium products are the entire business — which means deeper technical knowledge, faster turnaround, and better service.
View the Cills.ie listing on Constructors.ie →
Why Aluminium? Why Now?
The timing of the Cills.ie business reflects a broader shift in the Irish construction market. As the SEAI's One Stop Shop retrofit scheme has accelerated the pace of ETICS installations across the country, one consistent challenge has emerged: replacing inadequate window cills, parapet cappings, and trims at retrofit projects.
When 100mm or more of insulation is added to the external face of a wall, existing natural stone or cast concrete cills — typically 90–110mm wide — no longer provide adequate overhang over the new wall face. Water runs behind the cill, into the junction between the cill and the new render, causing exactly the kind of damp and staining that the homeowner has invested thousands of euro in preventing.
The solution is a new aluminium window cill, manufactured to the precise width needed to overhang the newly insulated wall face by the recommended 40–50mm. The same applies to parapet cappings and external trims throughout the building. This is precisely the niche that Cills.ie fills — and fills well.
The Product Range
Aluminium Window Cills & Window Sills
For new-build projects, Cills.ie supply aluminium window cills in the standard widths used by Irish architects and contractors for blockwork cavity wall and timber frame construction. All Cills.ie window cill products feature:
- A correctly proportioned drip groove on the nose underside — preventing water tracking back onto the wall face
- Integrated fall in the profile to ensure positive drainage away from the window frame
- End dam sections available to seal the returns against the reveal
- Powder coat finish in a broad selection of RAL colours
ETICS Retrofit Window Cills
Cills.ie's ETICS range is specifically designed for the external insulation retrofit market. These aluminium window cills are supplied in wider projections — from 150mm to 300mm+ — to bridge the newly built-out wall face and restore correct water shedding geometry. They can be specified in the same powder coat colours as the customer's window frames, ensuring a fully coordinated appearance after the ETICS render is applied.
Parapet Cappings
Aluminium parapet cappings are a critical weathering detail on flat-roof extensions, boundary walls, and modern residential parapets. Cills.ie supply pressed aluminium cappings to suit the full range of Irish parapet widths, with correctly designed drip edges and available in all RAL colours. A correctly specified and installed aluminium parapet capping prevents water ingress at one of the building's most vulnerable junctions — the top of the wall.
External Trims and Soakers
Cills.ie also supply a range of aluminium external trims including cavity closer trims, ETICS starter trims, window surround trims, and aluminium soakers for roof-wall junctions. These complete the aluminium envelope detail across a building, ensuring every external junction is correctly weathered and colour-coordinated.
Technical Credentials and Installation Guidance
Cills.ie provides practical installation guidance to help their customers achieve the correct outcomes on-site. The aluminium used in Cills.ie products is powder coated to Qualicoat Class 1 or better standard, ensuring the finish meets the durability expectations for Irish external architectural applications. Correctly maintained, powder-coated aluminium cills and cappings in this specification should provide 30+ years of service.
Who Uses Cills.ie?
- Self-builders — ordering window cills and parapet cappings for their own new-build projects
- ETICS/retrofit contractors — who need a reliable, fast-turnaround supply partner for replacement cills, cappings, and trims on every ETICS project
- Window companies — who supply and install windows and need to offer a complete sill package
- Main contractors and housebuilders — specifying aluminium cills, cappings, and trims as standard on new-build projects for consistency, low maintenance, and longevity
Getting a Quote From Cills.ie
To get an accurate quote for window cills, parapet cappings, trims, or any other aluminium external product, you'll typically need to provide:
- Product type(s) — window cills, parapet cappings, trims, etc.
- Dimensions — window widths, cill projection required, parapet width, etc.
- Quantity — number of windows, linear metres of capping or trim required
- The desired powder coat colour — ideally a RAL colour reference
- Required delivery timeframe
Most standard enquiries receive a quote within 1 working day.
Contact Cills.ie Through Constructors.ie
Cills.ie is listed on Constructors.ie, Ireland's trusted directory of verified construction professionals and suppliers. Their listing at constructors.ie/company/cills includes full contact details, product information, and the ability to submit a direct enquiry.
Whether you're a self-builder planning a new home, an ETICS contractor who needs replacement window cills and parapet cappings, or a main contractor looking to standardise on quality aluminium external products — Cills.ie is the Irish specialist to call.