ᐅ Types of Windows: Single- or Double-Leaf, Which Widths – Experiences?

Jorobel schrieb:
Single- or double-leaf windows?
What widths and heights?
Double-leaf with or without a mullion?
What are the advantages and disadvantages of these windows?

First, I would (ideally the architect does this, but often houses are built without one) determine the lighting requirements for each room. Depending on the room size, this gives you the (minimum) window areas, which can then be adjusted according to preference. Children's rooms should generally be brighter, while for a guest restroom it’s not as important. ... In my opinion, corner windows or rooms with windows on two adjacent walls are particularly attractive. This process should always be coordinated with the house elevations (which are more or less determined by the floor plan).

Whether to choose single- or double-leaf windows mainly depends on the window width. Very wide windows result in heavy sashes that also protrude far into the room when open. Logically, many double-leaf windows are used (because large window areas are initially planned to maximize light).

Choosing between with or without a mullion (no mullion means a French casement window) is a matter of taste. Without a central post, the clear opening is larger, but the second sash cannot be tilted and can only be opened if the first sash is opened first (so you have to decide which sash is the “primary” one; tilt-and-turn). With French casement windows, the central bar is narrower (allowing more light), but some might perceive this as asymmetrical.

Floor-to-ceiling elements are certainly trendy and let in a lot of light, but in my opinion, they severely limit the possible furniture layout—unless you like having the back of typical desks (with all the Wi-Fi cables and power strips) facing the window.

One more point: Large windows are more expensive than small windows. Windows cost more than regular walls.

We chose all our double-leaf windows as French casement windows. Upstairs we don’t have any floor-to-ceiling elements.

The 40cm (16 inches) sill height from BeHaElJa also appeals to me. If it fits the overall concept, it’s especially great for children’s rooms (small kids can still look outside while playing), or in the bedroom (seeing the lovely garden while lying down), or in the bathroom (viewing the garden from the bathtub). For various reasons, we decided against this, but we are building a rather standard house and not an architect-designed one.

@BeHaElJa could we see some pictures of that?

I can gladly do and upload it on Friday.

BeHaElJa schrieb:


We are really happy about the 40cm (16 inches) parapet heights on the upper floor – airier than standard parapet heights, but more private than floor-to-ceiling windows (sounds odd, but it’s hard to describe)

A parapet height of 40cm (16 inches) is not allowed on the upper floor without additional fall protection. Parapet heights of 40–50cm (16–20 inches) are intended for sitting, while 80–90cm (31–35 inches) are for standing in front of them. The minimum required is 80cm (31 inches). This can be found with a quick 2-minute online search.

If you don’t want a parapet at all, basically the only option is to use a full glass panel as a barrier. However, very few people do this; most go with a parapet.

The windows have fixed sections and operable sections. The fixed parts provide better insulation and are often larger, while the operable parts allow for ventilation and easy cleaning. When planning your house, consider the type of window opening that best suits each room’s purpose and location.

Common types of window openings include tilt-and-turn, casement, sliding, and awning windows. Tilt-and-turn windows, for example, can tilt inward for ventilation or open inward fully for cleaning. Casement windows are hinged at the side and open outward. Sliding windows move horizontally along a track, and awning windows are hinged at the top and open outward.

For energy efficiency, it’s important to choose double or triple glazing depending on your climate. Seals and frame materials also affect insulation and durability. PVC, wood, aluminum, and composite frames each have their advantages and price points.

Make sure to check local building codes and obtain the necessary building permits / planning permissions before installing windows, especially if you plan to change the size of the openings in the building envelope. Proper installation is crucial to avoid air and water leaks.

If you have further questions about materials, installation or design options, feel free to ask.

The lower part is fixed with a height of 80-90cm (31-35 inches), like we have? (Pictures page 1 post 2-3)
Then the parapet is unnecessary.