sivuikkunan

A sivuikkunan is a Finnish term that refers to a side window typically installed on the exterior of a door or a built-up façade. The word combines sivu (side) and ikkuna (window). It functions primarily as a source of natural light, ventilation, and sometimes as a secondary entrance. In domestic architecture, sivuikkunat are frequently positioned above low thresholds or at the side of main doors, allowing occupants to glimpse the outdoors without opening the main entrance.

These windows are designed to be unobtrusive and often feature a rectangular or slightly arched frame. Conventional materials include timber, PVC, or aluminium, with nowadays a high preference for low‑energy glass. The glazing is usually simple single or triple glazing, with optional operable panels. Some modern designs incorporate frosted or patterned glass to enhance privacy.

Historically, sivuikkunat were common in 18th‑ and 19th‑century Finnish rural houses where they added a modest amount of light to otherwise dark interiors. The design also served practical purposes, such as the passage of cargo or drapery. In contemporary Finnish architecture, the side window is often used in multifunctional rooms, such as laundry rooms, utility corridors, or as an auxiliary exit for safety.

The regulations for installation vary by municipality. Finnish building codes require that any sleeping area or habitable space with a sivuikkunan must comply with minimum visual height and egress guidelines. The window must also be equipped with a working sash or lock for security.

In summary, a sivuikkunan is a functional architectural feature that enhances both the aesthetic and practical aspects of a building. By allowing additional light and a secondary access point, it helps to improve spatial quality while respecting Finnish climatic conditions and design traditions.