What equipment is for resale value

I think the question is wrongly posed. Apart from obvious points like location, living/usable space, floor plan, and lot size or orientation, it’s more about what one should refrain from. In my experience, most buyers, aside from a few key data points, don’t have concrete ideas. The houses basically under consideration are therefore evaluated by the process of elimination, and the one with the fewest negatives wins. In this respect, there are a number of "components" that, for cost or technical reasons, can no longer be changed (or can’t be changed), but which represent a no-go for many buyers (local empirical evidence). I count among these, for example:

[*]Facade with ETICS [*]glazed (shiny) roof tiles [*]radiators instead of underfloor heating [*]interior walls made of aerated concrete, Poroton, or other poorly soundproofing materials [*]ceiling height < 250 cm

Also very off-putting is obvious, excessively extensive DIY tinkering by amateurs. All positive "special features," in my opinion, are too much determined by individual taste and/or zeitgeist to be subjected to the dictate of resale value in this respect.

Almost all houses do have Poroton as interior walls if they are made of brick, what else apart from KS are you thinking of? Besides, it depends on the thickness... with 11 cm Poroton I agree with you.

First of all, one must differentiate what kind of house is even the subject of the question. For a marketable model, all of this has a completely different relevance than for a house that is already somewhat special anyway – whether because of four children's rooms, a glass wall between the hallway and the garage, a barrel roof, or the like: there the tile color takes a back seat.

In some places in Bavaria, there may still be relatively more Protestants than houses without a basement. Regarding underfloor heating, I agree that it is established, so it definitely did not appear as a one-hit wonder in the 80s – but I also agree that it needs to be well planned: planning only a single zone in a 60 sqm living/kitchen/dining room – possibly even with a fireplace! – would be too sluggish. I also agree with the white-anthracite trend: the pseudo-symmetries of the facade layout, gained through smoky eyes, will soon be what shoulder pads were for blazers: thoroughly out of fashion precisely because they were once too popular. I also predict a decline in pizza-order kitchens (because if actually used, they are less decorative standing in the living room) as well as SBS refrigerators, which only imitate the living situation of some sitcoms. I expect barrier-free showers to become established, rain showers and designer double washbasins maybe only, and the T-bathrooms will be the glass bricks of the coming decade.

I consider ceiling heights largely a matter of taste, as well as venetian blinds or floor-to-ceiling windows. And although I don't think much of ETICS besides distance, I do not see it as critical for resale – simply because there will always be too many competing properties that will also have it.

By the way, there is already a thread on this topic here:

One could then generally add prefabricated houses / wooden houses to the list

A typical prefabricated house panel contains no more wood by mass than cheap orange juice; buying a prefab house for wood romanticism would probably not even seriously occur to Alpha Chantalles – at least I hope so.

I think most people don't give a damn about materials. Only the type of house-building forum user cares about that. A wall is a wall. Maybe grandpa's realization still rings a bell that prefab houses are no good. There used to be a lot of shoddy work done back in the day. But that's about it. (... personally, I don't understand why you would put up a wooden frame for the same money instead of using stone. But that's and remains a matter of mindset)

what other than KS are you thinking of?

Drywall is also an option to separate rooms without feeling like you have the snorer next door right in your own bed. It may be possible to achieve comparable results mathematically with stronger Poroton bricks, but who wants to give away living space for that?!

I also agree that it needs to be well planned

That is an essential requirement, but not because of inertia (which affects several units just as much as a single one), but because of the possibility to operate heat pumps on such a surface heating system. The ban on oil heating is in place, gas will follow.

And although I don’t think much of ETICS except for the spacing, I don’t see it as critical for resale - simply because there will always be too many competing properties that have it as well.

Now that is somehow thinking around the corner one time too often. The OP is exactly asking about ways to keep the resale value of his house in mind as early as during construction. So why agree with ETICS on the grounds that others make the same mistake when he could actually stand out positively from the "mass" with it?

but not because of inertia (which affects several circuits as well as a single one)

A "division" of the line length seems to improve this to me.

Why then approve an ETICS with the argument that others also make the same mistake, when it could actually stand out positively from the "masses"?

No, not approve - but if he tends to do so, he shouldn't be discouraged by the fear of a penalty to the market value because of it. His property simply won't fall far enough behind, simply because many other properties will have the same (possibly except if they are one energy saving ordinance level older). But within the same energy saving ordinance release level, to put it bluntly, you either have insulating foam or wall thickness.

Outside the digital world, I have practically never met anyone who has reservations about EPS insulation. Here, 80% of the new residential area is built this way, including the properties beyond the million mark. Outside of single-family house construction, in my opinion, this is the only way buildings are constructed. This is because monolithic, highly thermal insulating bricks do not have the necessary static properties for residential construction and are also uneconomical.
Future stricter regulations can only be compensated by a monolithic wall with even more thickness.

I would say ETICS will continue to dominate in the future. Wood is still possible for single-family houses, but not for apartments.