Extension on an old building from 1965 with an additional storey

A facade insulation has not been installed yet. What do you mean by obligation? When a conversion is made, or when subsidies are applied for?

If you make more than minor changes to the facade, and that would be an additional story or extension, you will be obligated to comply with the current energy saving regulation. So, façade insulation with all its advantages, disadvantages, and costs will be necessary.

On the ground floor, I don't want to move a load-bearing wall; the exterior wall is already somewhat recessed. Or do you mean another one?

Somewhere I thought I saw a displaced wall.

After all, it is a renovation and not a new build.

You're certainly not planning a renovation. Adding an additional story and extension is more expensive than new construction! You might not need a new bathroom now or save something by relocating it, but you still have to calculate with 2000€/m² of living space plus incidental construction costs, planning fees, etc. The longer I think about it, I would mentally start planning with 300,000€.

My parents would continue to live in it.

I hope they go along with all the planning, and I hope they are aware that they will have to be moved to a holiday apartment for six months or longer.

I thought I had seen an offset wall somewhere.

In the new upper floor in the cooking / dining area.

Hello again, yes, in the upstairs I actually moved a wall. I wasn’t sure whether it is load-bearing or if the roof is redone, then the question is whether this wall is still load-bearing or if the roof can be supported differently.

I hadn’t actually read about the facade until now.

Regarding costs, you’re not giving me much hope ;-) Let’s see what the companies in the area say.

yes, I actually moved a wall in the upper floor. I wasn't sure whether it's load-bearing or, if the roof is redone, whether this wall will still be load-bearing or if the roof can be supported differently.

Not load-bearing, but bracing - and in my opinion not replaceable as planned. The lack of separate consideration of the floor ceiling and the roof structure is, in my opinion, exactly the problem here (and the roof weight cannot be transferred otherwise, in connection with the non-load-bearing wall beneath the ridge - mind you, unless one switches to a truss roof, but then you write off the residential attic).

Regarding costs, you’re not giving me much hope ;-) Let's see what the companies in the area say.

You can repaint a Golf I entirely - but only in the case of a GTI with a verifiably famous previous owner will you really do it. If you are attached to the house, then go ahead - but it is indeed a project for the architectural firm Pyrrhus & Varus.

If an extension is to be made, then ideally it should also be two-story, so that an additional room as a study/guest room is created on the upper floor.

Since the house has a shared staircase, everything should be planned so that, if necessary, it can be converted into three separate apartments.

So once again the egg-laying wool-milk-sow, which means the charm has to go ..?! I find the idea quite attractive, although I always have to visually label these two-story buildings as multi-family houses. We had someone here about 2? years ago who had to extend a normal gable roof house because of twins. surely still has the link?!

Ideally, it should not cost more than 200,000 euros, including expansion, etc.

I don't see that. Never. I'm not a cost expert, but I have built a house myself and have been an active reader of the forum for years. Demolition of the roof plus new roof framework plus AI thermal insulation, plus second floor, plus two-story extension... that's 300,000€ plus? Personally, I always find it quite uncharming for a family to place a staircase outside the living area. That divides. I don't find arguments for additional later living units desirable. Do you know what will come later? You want to live nicely now and not in compromise. I also see the problem with such conversions that as a layperson you can plan very limitedly because you don't know what is possible and feasible. The result is then such a block because you stick walls onto walls. In your place, I would take the time for an architect instead of continuing to refine the “high-rise”.

We had someone here about 2? years ago who had to extend a normal gable roof house because of twins. @11ant surely still has the link?!

He does, and just on Tuesday linked it there: — by the way, they were triplets.

I don’t see it. Never.

At least the naïve budget wish explains why the proposed alternative is not "seen."

If I were you, I would take the time for an architect

He can only be useful here if you don’t expect planning from him — but also take his advice to spare the house the contortion with the inserted intermediate floor (which would probably require implementing my suggestion with the apartment for the elderly). The house in its current state is already not a quick flip by design, as it was conceived before today’s tastes as a “witch’s house” with a raised ground floor and is “special” — albeit with the USP compared to most of its competitors to offer a respectable knee wall (the contemporaries of this house usually have knee walls and sloped ceilings in the attic). If you now redesign it as a tower building, it also loses its charm in the eyes of this already narrow target group and graduates into the category of "completely unsellable." That means if you really put a lot of money into it now — I see that too (even as a non-cost expert) starting with a 3 — then you have to pray to live to see the full repayment time, because a subsequent owner will be interested at most only in the plot. That I wouldn’t make “much hope” regarding costs was still a very mild understatement. That’s why I added the reference to Pyrrhus and Varus.