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Internal window sills

With our high-quality internal window sills a durable window ledge is created for plants and decorative items alike while a beautiful finish perfectly complements or contrasts with home interior design. Customisable in colour, size, and material, our window sills are made-to-measure and ensure excellent UV and water resistance as well as impressive insulation – just read on to discover more.

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  • Products
  • Materials
  • Customisation
  • Import
  • Installation
  • Reviews
  • FAQs

Our window sills

At windows24.com we offer three types of internal window sills: uPVC, Werzalit compact and Werzalit exclusiv. Find out more by clicking the buttons for the boards below or read on for a detailed overview.

  • uPVC interior window sill

    uPVC

    • Robust and scratch-resistant
    • Resistant to heat and UV exposure
    • Watertight and low-maintenance
    from € 1.20 from € 1.20
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  • Werzalit compact interior window sill

    Werzalit compact

    • Slim design with bevelled form
    • Made from PEFC-certified wood
    • Easy-care and durable
    from € 2.30 from € 2.30
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  • Werzalit interior window sill

    Werzalit exclusiv

    • Classic design with bonded front edge
    • Made from PEFC-certified wood
    • Insulating, robust, and low-maintenance
    from € 2.60 from € 2.60
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The materials in comparison

At windows24.com we offer one window sill made from uPVC as well as two Werzalit boards made from sustainable wood. As the most affordable option, uPVC is particularly low-maintenance and insulating thanks to its innovative structure and smooth customisable UV-resistant, watertight surface. The two wooden sills, on the other hand, come with the choice of a sleek bevelled or integrated overhanging front edge and feature a configurable surface coated in tightly bonded melamine resin.

What about stone or aluminium? – a question of insulation

Although stone and aluminium are popular window sill materials, for an indoor window sill uPVC and compressed wood still impress the most. Where exterior sills can benefit from the weight and sheer robustness of stone to protect them from the elements, a key function of interior window sills is to seal the window and prevent heat from escaping outside. With interior chambers or a dense form, uPVC and compressed wood provide best provide this necessary insulation. Thanks to quality metallic finishes or marble decors, the look of stone or aluminium can, nevertheless, still be achieved on the surface while the core remains perfectly tailored to the practical properties required for interior sills.

Colours and finishes for internal window sills

The surface of an internal window sill should serve both a decorative and functional purpose. Thanks to our range of choice and the professional manufacturing processes behind our products, internal window sills from windows24.com provide just that.

Available in a classic white or elegant marble smooth semi-glossy finish, our uPVC sills brighten and complement interiors, for example, while the inherent watertight, UV, and scratch-resistant nature of the sill's modern surface ensures the coating will hold durably for years to come. 

Our Werzalit internal window sills then also impress with quality colour finishes. Here multiple layers of a robust melamine resin coating are fused onto the wooden core under high temperatures.

This forms a tight bond and produces a particularly watertight, UV, scratch, and limescale resistant surface that comes in multiple colours and retains its vibrancy.

For both Werzalit compact and Werzalit exlusiv internal window boards, many smooth semi-glossy, pearl-textures, and fine-textured finish options are available. Selectable in our user-friendly configurator, bright cream, marble, or polar white are recommended to have the sill lighten interiors while a dark grey or betolit can create a darker, contemporary contrast. Other options, such as replica oak window boards or our acacia wood-replica decors add a more traditional touch, on the other hand, and bring warmth to your window.

Our smooth and semi-glossy finishes produce a particularly sleek surface surface. Cream white and marble bianco are available for uPVC sills and both our Werzalit boards can come in all the below.

Available for our wooden window sills, pearl textured finishes create a bubbled surface texture, add interest to the window area, and can be used to contrast or blend with interiors.

Available for our wooden sills, fine textured finishes produce a grain surface replicating a particular timber for a warm, traditional, and authentic look.

Popular customised internal window sills

Our uPVC sill in cream white

Cream white uPVC window sill
  • Classic elegance
  • Innovative uPVC
from € 1.20 from € 1.20
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Werzalit compact sill in marble beige

Werzalit compact sill in marble beige
  • Smooth and sleek stone finish
  • Compact wooden core
from € 1.60 from € 1.60
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Werzalit compact sill in acacia

Werzalit compact sill in acacia
  • Fine textured timber decor
  • Compact wooden core
from € 2.00 from € 2.00
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Werzalit exclusiv sill in betolit

Werzalit exclusiv sill in betolit
  • Contemporary pearl texture
  • Wooden core and classic design
from € 2.30 from € 2.30
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Further made-to-measure window sill options for the perfect fit

Dimensions

To ensure an accurate fit and have the window sill be tailorable to a range of different buildings, you will find an interactive dimension section in our online configurator. Here the overhang or depth of the sill can be set, as can the length by inputting the required measurements in mm into our minimum and maximum ranges.

Due to manufacturing and to ensure a uniform design some measurements, such as of the front edge or the sill's thickness, are then predetermined for each model and can be found in the configurator. The image and labels below give an idea of the range of possibilities:

  1. Sill overhang/depth: 100 - 550 mm
  2. Sill length: 50 - 2500 mm
  3. Sill thickness: 22 mm (uPVC) or 17 mm (Werzalit)

Closing edges

Whatever internal sill you opt for, a closing edge is a final feature that can be added to all our models. Closing edges are small caps that match the colour of the window board and perfectly finish the product by ensuring a well-rounded, continuous design.

For uPVC sills the caps are made from uPVC, supplied loose, and can be easily sized and installed onto either end of the sill. For our Werzalit window boards, on the other hand, once closing edges are selected upon purchase, the Teflon caps are added under high temperatures during manufacturing and can additionally feature a long-lasting ABS coating.

A note on import and delivery

Why order from us and abroad? At windows24.com we specialise in innovative products, international shipping, and logistics. Thanks to our experienced in-house professionals as well as tried and tested processes, delivery and import is kept simple. Differently to many local providers, we also provide a unique online configuration tool and supply highly customisable European quality at affordable prices.

In terms of the process, after you submit your window sill order, we will determine the best shipping costs and get in touch with a final quotation that includes delivery. This is sent with a payment link to complete the order should you wish to proceed.

Once everything is finalised, production will begin before shipping and delivery. When the product arrives, we can provide a logistics broker to support the import process and it is worth noting that due to the CETA agreement between Canada and the EU, our Canadian customers don’t have to pay import duties.

Step-by-step window sill installation

Interior window sill installation can be effectively carried out by customers in a few simple steps thanks to our instruction guides and clear images. Whether you’re a novice after practical advice or a professional honing skills, our accurate descriptions on window sill installation and removal ensure a quality finish and correct fit – just click below to find out more.

Over 200,000 satisfied customers and counting

Russ Drive New Zealand
Residential building
Russ DriveNew Zealand
Composite windows and doors for a passive house

“The windows from windows24.com meet all of our criteria for design, energy efficiency and high quality. These made-to-measure products are a perfect match for our passive house.”

Donvale, Australia
Residential building
DonvaleAustralia
uPVC sliding doors

“The window expert team supported us throughout the process: realising our ideas, choosing long-lasting materials, and the shipping from Germany to Australia.”

Arizona, USA
Residential building
ArizonaUSA
uPVC windows and doors

“Great customer service! The professional advice from the windows24.com-team helped us choose the ideal products for situation.”

Peppertree Australia
Residential building
PeppertreeAustralia
Special window shapes

“windows24.com delivered windows to us that perfectly fit to the design of our house. These are no standard windows! We were surprised by how exactly we could define the shape of each window.”

Frequently asked questions

As  products from windows24.com are highly customisable, the cost of our window sills differs depending on the material, size, colour, and extras selected. In their most basic configuration though uPVC is the most affordable sill, available from €1.20.

How large the sill's overhang or depth should be depends on the installation situation and personal taste. A narrow sill may be more suitable for minimalist interiors, for example. We sell window sills with an overhang or depth of 100 - 550 mm and recommend that at least half of the sill rests on the masonry to ensure the necessary stability. If this is not at all possible then brackets should be installed for enhanced support.

There  is no definite timeframe for when an existing window sill should be  replaced but in general if rotting or water damage is seen or if the surface is fading and de-forming, replacing the sill is often recommended. A newer sill with quality modern materials will last longer and create a sleek finish while also insulating interiors. Replacing  sills may also be carried out for decorative purposes to enhance  interior design.

Do you still have questions?

In our FAQs you will find answers to the most frequently asked questions about internal window sills.

Didn't find what you were looking for? Then give us a call at +49 711 860 60 200. Our experts would be happy to answer your questions.

Another option is to schedule an appointment for a telephone consultation here. Whether for a new building or a renovation, you will receive one-on-one, specialist advice so you can design your bespoke product exactly as you wish.

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