Structural dimensions of windows; decisions between planning and construction

Hello,
I have received the first draft of the floor plan from the architect. The windows are shown with a width of 180 cm. I suspect that this refers to the raw construction dimension that the bricklayer uses? So far, I thought such measurements should always be n * 12.5 + 1 cm (joint), which would result in 176 or 188.5 cm. I am attaching a picture.

Before I address this with the architect, I would like to know whether the mistake in reasoning is on my part (well, probably it is..)

We are also not yet certain about a few other questions. All will be decided before the respective awarding of contracts, but which of these must or should already be clarified for the building application?:

[*]The roof is planned with a 20 degree pitch; the choice between tile and sheet metal is still open.
[*]The upper floor will be open up to the ridge. However, some ceilings (e.g., WC) might be suspended.
[*]Whether and where we install roof windows, we would also like to decide later.

(There are no external requirements, in particular no development plan)

Thank you very much for information and comments.
Karl

Which stone are you building with?

24er Poroton (planning status). Should the planning primarily be based on the actual brick (and the windows be adjusted accordingly), or are there standard window widths and heights (as I thought) that determine (should determine) the clear dimension?

There are no standard windows anymore (maybe still at the hardware store?), all are made to custom measurements.

I have received the first draft of the floor plan from the architect. It shows a width of 180 cm at the windows. I suspect that this is the raw construction dimension that the bricklayer follows?

Your suspicion is correct.

So far, I thought that such dimensions should always be n * 12.5 + 1 cm (joint), then I would get 176 or 188.5 cm.

You were quite right with that when masonry was still significantly done with small formats. Nowadays, practically only modern jumbo formats without mortared joints are used, so the joint centimeter can be omitted from the calculation. >> here therefore the closest: 175 / 187.5 cm

In planning, do you primarily base yourself on the actual brick (and adjust the windows accordingly), or are there standard window widths and heights (I thought) that determine (should determine) the clear dimension?

Proper practice is the application of the standard dimensions (effective for all bricks in the eight-centimeter grid*) to the masonry dimension (and consequently also to the masonry opening dimension). The window width is ideally measured in whole or half omitted bricks. It is sensible, not least because of the window sills, that the rhythm of the masonry bond continues across the openings. *) since in your project we had the question of reused bricks from a previous building: in the Reich format 1.83 m (14 header bricks + joint) would be the next "round" dimension. The same applies correspondingly to non-DIN clinker formats: the large and later "hidden" bricks of the structural masonry shell are naturally more economical to cut to the adjusted size than the small facing bricks.

Thank you very much for the quick responses. That means I ask the architect to adjust the window widths to

here so closest: 175 / 187.5 cm

.

How about the three other points I mentioned? Do the decisions have until "after the building permit" time? Karl