External window sills in coated steel — made to measure

An external window sill protects the area below the window and helps drain water away from the face of the façade. It is also a prominent architectural detail, connecting the appearance of the window frames with the wall finish. Sheet metal sills offer a durable, attractive result at a reasonable cost. At SteelProfil, we make them to agreed dimensions and details, making it easier to fit both new buildings and renovated window openings.

The sill collects water running down the window and directs it outwards. A suitable slope and a shaped drip edge set clear of the wall surface help it perform this function. A carefully made detail reduces wetting and water stains below the window. This is particularly useful after new external insulation has been installed, when keeping the façade clean and even over the coming seasons matters.

Coated sheet metal allows you to choose a colour to match the windows, roof or flashings. A dark sill can emphasise the frame, while a colour close to that of the façade creates a quieter, more discreet effect. Its low weight makes transport and installation easier, including for longer sections. The finished surface is convenient to maintain, and a suitably chosen coating helps protect the material against the weather.

These sills can be used on homes, commercial premises, offices, industrial buildings and lightweight-clad pavilions. In every case, the actual dimensions and the connection to the window matter. When adding insulation, allow for the thickness of the new layers; when replacing windows, also consider the frame position. Made-to-measure fabrication helps avoid a sill that is too narrow or projects unnecessarily beyond the planned façade line.

During installation, adequate support, a sealed connection to the window and suitable side finishes are important. Allow for movement with temperature changes and keep the window drainage paths clear. A well-prepared drawing makes ordering easier and reduces adjustments on site. We can help organise the dimensions so that the sill suits the wall layers and planned finish.

SteelProfil combines made-to-order window sills with a range of sheet metal and accessories available from stock. Our wider building materials range includes first- and second-grade options, helping you match the purchase to your budget and application. For highly visible components, pay particular attention to the coating and colour consistency. We agree the production time for sills according to their dimensions, quantity and selected material.

Our promotions and competitive prices help you complete the façade finishing stage. Prepare the width, length, fold geometry and desired colour, and we will help price the set. You can also select the remaining flashings and fixings. Choose SteelProfil sills to protect the area below your windows and give the building a consistent appearance with details planned from the outset.