**The sill of a window should be located at a height above floor level**

The sill of a window is an important component of a building structure as it serves several purposes. It provides support to the window frame, helps to prevent water infiltration, and also serves as a decorative element. The correct height at which the sill should be located is crucial for the functionality and aesthetics of the window.

**Various options for the height of the sill**

1. Option 1: 0.75m to 1 metre
2. Option 2: 1m to 1.5 metre
3. Option 3: 0.75m to 1.5 metre
4. Option 4: 1m to 2.0 metre

**Considerations for determining the height of the sill**

The height at which the sill of a window should be located depends on several factors, including the following:

1. **Functionality**: The height of the sill should be chosen to ensure that it allows for easy operation of the window. It should be low enough to provide convenient access to open and close the window, especially for occupants who may have limited mobility.

2. **Safety**: The height of the sill should also be determined with safety in mind. It should not be positioned too high, as it may pose a risk of falling or injury if someone accidentally leans or trips against it.

3. **Natural Light**: The height of the sill can affect the amount of natural light entering the room. Placing the sill too high may block a significant portion of the window, reducing the amount of daylight and making the room darker.

4. **Views and Ventilation**: The height of the sill can impact the views from the window and the ventilation of the room. Placing the sill too low may limit the view and obstruct the line of sight. On the other hand, placing it too high may restrict the flow of fresh air into the room.

**Recommended height range for the sill**

Considering the above factors, it is generally recommended that the sill of a window be located at a height between 0.75m to 1.5 metre. This range allows for a balance between functionality, safety, natural light, views, and ventilation. It provides easy access to operate the window, ensures safety by avoiding excessive height, allows for sufficient natural light, and offers unobstructed views and ventilation.

Therefore, option 3 (0.75m to 1.5 metre) is the most suitable choice for the height of the sill of a window. However, the specific height within this range may vary depending on the specific requirements of the building, the type of window, and the preferences of the occupants. It is important to consider these factors and consult relevant building codes and standards when determining the precise height of the sill for a particular project.