Cultivation EU / Roof structure extension upper floor - Which is more expensive?

So now the current floor plans with some explanation :)

On the ground floor, at the very back of the illustration, basically where the wing is, is the extension. And this part is to be roofed over on the upper floor.

Or we would like to build a side extension on the right side of the house from the front window at the bottom right to the old extension.

Is that clearer this way?

I can imagine that extending the attic will be cheaper. An extension needs a concrete slab, etc. Besides, you need more space on the upper floor, right?

@ Schnuck

Thanks so far. Is the single-family house basemented?


Building expert on the go

: Yes, it is partially basemented in the front area. The basement is from 1948, so it is not usable as living space.

: Where the living space is created is initially not important to us - there just has to be more space for children's rooms :)

Good morning,

: Yes, it is partially basemented in the front area. The basement is from 1948, so it is not usable as living space.

Well then...

If you build an extension at the side, you have to support the existing house in the area of the partial basement; an extension would only make sense – as a gain of living space for the kids – if it is built over both floors. This would, in the case of a side extension, again require a partial dismantling of the existing roof. The previous 2.00 m line is currently located quite far inside, which means the extension would have to be at least 2.00 m – finished internal dimension – if it is to noticeably benefit the children's rooms. Costs would arise on this side of an extension for support measures of the existing single-family house, base slab, masonry, windows on ground floor + upper floor, as well as costs for roof connection and extension; of course plus the costs of interior finishing.

If you want to continue the existing extension into the attic, the roof must also be partially dismantled to later create a non-visible connection. You would also have to completely change the internal layout in the existing attic to access the rooms of the – then finished – extension. With this option, costs would arise for scaffolding, roof dismantling and rebuilding, masonry, windows; again plus costs of interior finishing and rearrangement of access to the rooms in the extension.

Therefore, I would recommend in any case that you find a construction expert you trust and discuss the necessary work with him. Ideally a construction expert who specializes in renovation; such a person usually has the necessary trades at hand and tends to bring more creative ideas regarding the existing structure into the discussion than a construction expert who works exclusively in new construction.

Rhenish greetings

Hello construction expert - thank you very much. The partition wall on the upper floor is currently at 1.80 - we would remove this completely and of course completely redesign the entire upper floor, including windows, etc. New insulation is needed anyway - also in the attic. I will show you our floor plan ideas for better understanding. The side extension would be in the area where there is no basement. An extension only on the ground floor would be sufficient for us - this way we could easily make up for the one missing room and it would not be necessary on both floors.

Explanation:

The top row belongs together. Each time the upper floor with a bathroom variant either inside or on the far right. The roof structure would need to be extended here. (Basically a construction on top of the existing one from the ground floor) The two on the right are the ground floor and differ only minimally. (Kitchen variant)

The bottom row belongs together on the left two. Extension only on the side on the ground floor - and therefore only 2 children's rooms and a bathroom needed upstairs.

The two on the right: Smaller extension on the ground floor and continued upstairs. This creates space upstairs for 3 children's rooms + bathroom.

Best regards