Window sills are part and parcel of many rooms in a house or building, and in fact, to see a window without a sill can look rather odd. In this article, we will explore the basics of fitting a window sill and picking the right apron.

Window sills exist as more than a reason to add a ‘finish’ to the window bay area. The purpose of these items is that they can create texture, quality, and atmosphere and even add monetary value to your property. Therefore, knowing how to fit these is important so you can target all these purposes and achieve the desired effect.

Window Sills and Aprons

Firstly let’s explore what each of the terms actually means:

The Sill is the area at the bottom of the window opening. This actually comprises of two parts: the base is the shelf itself, whereas the apron is the trim that runs under the shelf (usually as a decorative piece).


Fitting Window Sills

Although the process is not complicated it can be a delicate and intricate operation. Therefore we advise you to check all parts of the process carefully as you proceed through the job, or alternatively seek assistance if unsure.

* The first step is to measure for the sill (as shown by the picture above, this is the piece that will appear to ‘stick out’ – the one that acts as a shelf). Although the shelf will stick out, the actual shelf will sit inside the window reveal. This is an important point to remember.

* Window sills can come in a range of styles, sizes and materials (e.g. oak, maple etc,) so the next process is to decide which of these will suit. Sometimes this will be dependent on individual budgets but other times the atmosphere you are trying to create will be the deciding factor.


* Once you have the choice of the sill, you need next to decide on the apron style. Again a variety of styles/types exist, and this can range from something plain or generic to a fancy/elaborate design.

* Cut the sill but remember to allow the ‘notches’ at the sides so the shelf actually fits within the reveal. Next, line up the apron and cut as necessary.

* (Once you are happy and checked to see the items fit and look appropriate the next step is to fix).

* Fixing is best done by pre-drilling the holes to avoid damaging the sill/apron and causing it to split open. Use screws (of appropriate length) and countersink the screw holes for a more concealed finish. These holes can then be concealed further after by applying filler to cover them up. The apron is then fixed in broadly the same manner.

Once the above process has been finished, you can either: leave the window sill, stain it, or paint it. Then the job is done!


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