Contractor Favourite. Trusted by Builders Across Ireland

Aluminium Window Cills

Custom Made & Powder

Coated

At Cills.ie, we provide precision-engineered aluminium window cills across Ireland. All our cills

are made-to-measure, powder-coated in any RAL colour, and designed to last. Whether for

new builds, retrofits, or external insulation projects, our aluminium cills deliver durability,

accuracy, and a professional finish.

At Cills.ie, we provide precision-engineered aluminium window cills across Ireland. All our cills are made-to-measure, powder-coated in any RAL colour, and designed to last. Whether for new builds, retrofits, or external insulation projects, our aluminium cills deliver durability, accuracy, and a professional finish.

Trusted by 1000+ contractors

3-5 day turnaround

Free delivery over €150

Made in Dublin

Measure directly on site

See exact shape beforeit is made

Handmade in Dublin with care

Every cill is produced to your exact measurements, checked for accuracy, and finished to a

high standard. No reorders. No wasted days.

Order Without Second Guessing

Watch Demo

Free account. Instant pricing. No credit card required.

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Understanding the Basics

What is a Window Cill?

A window cill is the horizontal ledge at the base of a window. Its

main function is to direct rainwater away from the wall, protecting

the building from dampness and water damage.

A window cill is the horizontal ledge at the base of a window. Its main function is to direct rainwater away from the wall, protecting the building from dampness and water damage.

Traditionally, cills were made from stone, timber, or concrete.

However, aluminium window cills are now the preferred choice for

modern construction and retrofit projects because they are

lightweight, durable, and weather-resistant. They can also be

powder-coated in any RAL colour, ensuring they match perfectly

with your windows, render, or façade.

Traditionally, cills were made from stone, timber, or concrete. However, aluminium window cills are now the preferred choice for modern construction and retrofit projects because they are lightweight, durable, and weather-resistant. They can also be powder-coated in any RAL colour, ensuring they match perfectly with your windows, render, or façade.

Lightweight yet incredibly durable

Weather-resistant and maintenance-free

Powder-coated in any RAL colour

Perfect match for windows and façade

Precision Guaranteed

Stop Guessing.

Start Measuring Right.

One small guess can cost more than you think. A measurement

that feels close enough. An angle you assume is square. A detail

you plan to "adjust on site." CILLS changes how measurement

works.

Produced to your exact measurements

Checked for accuracy before dispatch

Finished to a high standard

No reorders. No wasted days

Order Without Second Guessing

Watch Demo

Measurement errors

The Real Problem Is Not Skill

Why Reorders Slow Everything Down

Most measurement methods were never designed for accuracy. Sketches are open

to interpretation. Photos hide depth. Messages lose context. Even experienced

tradespeople are forced to guess. And aluminium does not forgive guessing.

Most measurement methods were never designed for accuracy. Sketches are open to interpretation. Photos hide depth. Messages lose context. Even experienced tradespeople are forced to guess. And aluminium does not forgive guessing.

One Wrong Cill Stops the Entire Job

Trades wait. Schedules slip. Money is

lost. Most of the time, it comes from one

small measuring mistake that started on

paper and turned into real cost.

€4.4M

Lost annually in Ireland to measurement

errors

Cold Bridge Formation

Incorrectly sized cills create gaps where

cold air penetrates the building

envelope. This reduces your U-value,

increases heating costs, and causes

condensation and mould.

15%

Heat loss from poorly fitted external details

Water Ingress and Damage

Cills that do not project far enough or

lack proper drip edges allow rainwater to

run back against the wall. Over time, this

causes damp, staining, and structural

damage.

70%

Of damp issues trace back to external details

Prevent Problems Before They Start

Measure Right.

Prevent Cold Bridge & Water Damage.

Our visual measurement system is designed to prevent the most

common errors that cause cold bridging and water ingress. Here's

what you need to know:

Measure the Full Opening Width

Measure from external wall to external wall, not the frame. Add 25-50mm each

side for proper overhang to shed water away from the facade.

Measure from external wall to external wall, not the frame. Add 25-50mm each side for proper overhang to shed water away from the facade.

Calculate Projection Correctly

Measure from the window frame face to the outer edge of your external

insulation or render. Add 40-50mm minimum for drip edge overhang.

Measure from the window frame face to the outer edge of your external insulation or render. Add 40-50mm minimum for drip edge overhang.

Account for Insulation Depth

For ETICS/EWI systems, measure the full insulation thickness. Undersized cills

create thermal bridges and void your insulation warranty.

For ETICS/EWI systems, measure the full insulation thickness. Undersized cills create thermal bridges and void your insulation warranty.

Check for Level and Square

Never assume openings are level. Measure at multiple points. Our app validates

your measurements and flags potential issues before ordering.

Never assume openings are level. Measure at multiple points. Our app validates your measurements and flags potential issues before ordering.

100%

Measurement validation

Visual Measurement System

CILLS Changes How Measurement Works.

See the Exact Cill Before It Is Made.

You measure directly on site using your phone. You enter real

dimensions, not rough notes. Angles, returns, and projections are

defined clearly. You see the exact cill shape before it is made. Not

a sketch. Not an assumption. The real thing.

You measure directly on site using your phone. You enter real dimensions, not rough notes. Angles, returns, and projections are defined clearly. You see the exact cill shape before it is made. Not a sketch. Not an assumption. The real thing.

Clear labels for projection, length, and returns

Automatic validation catches cold bridge risks

3D preview shows exactly what you are ordering

Prompts for insulation depth on retrofit projects

Order Without Second Guessing

Smart Platform

We Find the Best Supplier for Every Order

Stop phoning around for quotes. Our platform automatically matches your order

with the optimal manufacturer, or routes Dublin orders to our in-house facility for

faster turnaround.

Stop phoning around for quotes. Our platform automatically matches your order with the optimal manufacturer, or routes Dublin orders to our in-house facility for faster turnaround.

We Find the Best

Supplier

Stop calling around for quotes.

Our platform automatically

matches your order with the

nearest, cheapest, and fastest

manufacturer in our network.

Dublin In-House

Manufacturing

Dublin-area orders can be

manufactured in our own facility

for faster turnaround and direct

quality control.

One Platform, Multiple

Suppliers

Access a network of verified

aluminium fabricators through a

single account. Consistent

quality standards across all

suppliers.

Automated Order

Routing

Your order is automatically sent

to the optimal supplier based on

your location, timeline, and

specifications. No manual

coordination needed.

Everything You Need to Order Aluminium Cills Online

Purpose-built for contractors, builders, and installers who need accuracy,

speed, and fair pricing.

Purpose-built for contractors, builders, and installers who need accuracy,

speed, and fair pricing.

Visual Measurement System

Our interactive diagrams guide you

through every dimension. No more

guesswork—see exactly where each

measurement goes with clear visual

indicators.

Our interactive diagrams guide you through every dimension. No more guesswork—see exactly where each measurement goes with clear visual ndicators.

Instant Online Pricing

Get real-time quotes as you design. No

waiting for callbacks or email quotes—

know your exact cost immediately.

Transparent pricing with no hidden fees.

Get real-time quotes as you design. No waiting for callbacks or email quotes— know your exact cost immediately. Transparent pricing with no hidden fees.

Full RAL Colour Library

Access the complete RAL Classic colour

range with live 3D preview. See your

aluminium cill in Anthracite Grey RAL

7016, Jet Black RAL 9005, or any colour.

Access the complete RAL Classic colour range with live 3D preview. See your aluminium cill in Anthracite Grey RAL 7016, Jet Black RAL 9005, or any colour.

3-5 Day Manufacturing

Fast turnaround from order confirmation

to dispatch. Dublin orders benefit from

our in-house manufacturing for even

quicker delivery.

Fast turnaround from order confirmation to dispatch. Dublin orders benefit from our in-house manufacturing for even quicker delivery.

Smart Supplier Matching

Our platform automatically finds the

nearest, fastest, and most cost-

effective manufacturer for your order.

Dublin orders can be manufactured in-

house.

Our platform automatically finds the nearest, fastest, and most cost- effective manufacturer for your order. Dublin orders can be manufactured in- house.

Nationwide Delivery

Free delivery across Ireland for orders

over €150. We deliver to Dublin, Cork,

Galway, Limerick, Waterford, and every

county in Ireland.

Free delivery across Ireland for orders over €150. We deliver to Dublin, Cork, Galway, Limerick, Waterford, and every county in Ireland.

Custom Powder-Coated Colours for Every Aluminium Window Cill

Match any facade with RAL-certified powder coating. Our aluminium window cills, flashings, cappings,

and trims are made-to-measure and finished in your exact colour.

RAL 7016

Slate Grey

RAL 7015

Anthracite Grey

RAL 7032

Pebble Grey

RAL 7044

Silk Grey

RAL 8028

Terra Brown

RAL 9003

Signal White

Why Colour with Cills.ie?

Any RAL colour: hundreds of architectural finishes with UV-stable,

durable coating.

Any RAL colour: hundreds of architectural finishes with UV-stable, durable coating.

Perfect matching: on-site measuring devices capture the exact RAL

shade for windows and facades.

Perfect matching: on-site measuring devices capture the exact RAL shade for windows and facades.

Made-to-measure aluminium: precision fabrication for cills, bay/angled

cills, parapet cappings & weatherproof flashings.

Made-to-measure aluminium: precision fabrication for cills, bay/angled cills, parapet cappings & weatherproof flashings.

Retrofit-ready: designed for SEAI external wall insulation systems with

clean, watertight detailing.

Retrofit-ready: designed for SEAI external wall insulation systems with clean, watertight detailing.

Order in minutes: measure, preview colour, and track manufacturing &

delivery inside the app.

Order in minutes: measure, preview colour, and track manufacturing & delivery inside the app.

Open Colour Picker

From Design to Delivery in 4 Simple Steps

Design, price, and order your aluminium cills in minutes. 3-5 business day

manufacturing.

Design, price, and order your aluminium cills in minutes. 3-5 business day manufacturing.

Design Your Cills

Use our visual measurement

system to enter your specifications.

The 3D preview confirms your

design before ordering.

We Match You to a Supplier

Our platform automatically finds

the nearest, fastest, and most

cost-effective manufacturer—or

routes Dublin orders to our in-

house facility.

Manufacturing Begins

Your cills are precision-

manufactured from 2mm marine-

grade aluminium with premium

polyester powder coating. 3-5

business days turnaround.

Delivered to Your Site

Track your order in real-time. Cills

are delivered directly to your site,

ready for installation.

Customer Reviews

Trusted by Contractors Across Ireland

See why builders and installers are switching to Cills.ie for their

aluminium cill orders.

"Cills.ie has completely changed how we order window cills. The

visual measurement system means no more errors, and the

automatic supplier matching saves us hours of phoning around for

quotes."

"Cills.ie has completely changed how we order window cills. The visual measurement system means no more errors, and the automatic supplier matching saves us hours of phoning around for quotes."

Michael O'Brien

Site Manager, O'Brien Construction Ltd

Cork

"The app is brilliant for measuring on site. I can take measurements,

see exactly what I'm ordering in 3D, and place the order before I

leave. Delivery is always spot on."

"The app is brilliant for measuring on site. I can take measurements, see exactly what I'm ordering in 3D, and place the order before I leave. Delivery is always spot on."

Conor Kelly

Owner, Kelly's Home Improvements

Galway

"We were sceptical at first—another online ordering system. But

the 3D preview feature alone has saved us from costly remake

orders. And the pricing is genuinely better than our old supplier."

Sarah Murphy

Procurement Manager, Murphy Windows & Doors

Dublin

"As a one-man operation, I don't have time to chase quotes from

multiple suppliers. Cills.ie does it automatically and I always get a

fair price. The 2mm aluminium quality is excellent."

Patrick Doyle

Independent Installer, Doyle Installations

Limerick

Premium Quality

Built to Last.

Manufactured to Precision.

Every aluminium window cill is manufactured from 2mm marine-

grade aluminium with premium polyester powder coating.

Designed for the Irish climate with a 30+ year coating lifespan.

Every aluminium window cill is manufactured from 2mm marine-

grade aluminium with premium polyester powder coating. Designed for the Irish climate with a 30+ year coating lifespan.

Every aluminium window cill is manufactured from 2mm marine-

grade aluminium with premium polyester powder coating. Designed for the Irish climate with a 30+ year coating lifespan.

Material

Marine-Grade Aluminium

Thickness

2mm Standard

Maximum Length

3000mm

Projection Range

50mm - 400mm

Finish

Polyester Powder Coat

Colour Options

Full RAL Classic Range

Manufacturing

3-5 Business Days

Warranty

30+ Year Coating Life

iOS & Android

Measure on Site.

Order on the Go.

Download the Cills.ie app for iPhone or Android. Take

measurements on site and place your order before you leave—no

office visit required. Perfect for busy contractors.

Works offline. Sync when you have signal.

Save drafts and complete orders later

Push notifications for order updates

Full order history at your fingertips

App Store

Google Play

Choose Your Service Level

Pick the plan that suits your workflow - self-service, split responsibility, or full-service.

You Measure -
We Manufacture

Measure in-app, we fabricate. Collect or delivery options available.

What's included:

Guided measuring with 3D preview to avoid errors.

Made-to-measure aluminium cills, flashings and trims.

Fast manufacture - choose factory collection or delivery.

Start Measuring

Perfect for builders who want speed and full control.

We Measure -
You Fit

Book a site visit. We take the measurements and deliver ready-to-fit parts.

What's included:

On-site measurement using calibrated devices for exact RAL matching.

Perfect for complex bay and angled cills.

Delivered to site - parts ready for your installers.

Book a Measure

Ideal for retrofit contractors who want professional measuring without the hassle.

We Measure -
Deliver & Fit

Full service: measurement, manufacture, delivery and professional fitting.

What's included:

End-to-end service - we manage the process and fit on-site.

Engineer-validated installation and QA on completion.

Perfect for homeowners or busy contractors who want turnkey solution.

Request Full Service

Full peace of mind - we handle everything from A to Z.

Confidence on Site. Confidence with Your Client.

You measure once. You see the result. You order with confidence. No

delays. No rework. No wasted time. Each cill is handmade with care in our

Dublin workshop.

Order Without Second Guessing

Talk to Our Team

Explore More Products

All our aluminium products are designed and manufactured in Ireland with the

same precision and quality.

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Bay & Complex Cills

Multi-segment bay windows designed piece by piece.

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Bay & Complex Cills

Multi-segment bay windows designed piece by piece.

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Bay & Complex Cills

Multi-segment bay windows designed piece by piece.

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Aluminium Capping

Straight capping and corner pieces for walls and parapets.

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Aluminium Capping

Straight capping and corner pieces for walls and parapets.

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Aluminium Capping

Straight capping and corner pieces for walls and parapets.

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Flashings & Trims

Custom flashings in any profile for EWI androofing.

Learn more

Flashings & Trims

Custom flashings in any profile for EWI androofing.

Learn more

Flashings & Trims

Custom flashings in any profile for EWI androofing.

Learn more

View all products

Frequently Asked

Questions

Have another question? Please contact
our team!

What is an aluminium window cill?

An aluminium window cill is a custom-made, powder-coated aluminium profile installed under a window to direct rainwater away from the building. At Cills.ie, all window cills are made-to-measure, fully weather-resistant, retrofit-ready, and compatible with external insulation systems, ICF blocks, and all major window brands in Ireland.