Inspired by the original building, the extension was also to be built with cross-laminated solid wood panels. But since there was not enough space to use straw-insulated walls as well, we chose thicker wood panels instead. And in this case that means 18cm thick! If you want to cut a board like that, you need a circular saw so big that at least I almost can't carry it.
The original house I bought not quite two years ago was planned as a modular house, but only with the two original modules that could be taken apart and reassembled. Any further expansion was not planned. Accordingly, so several tasks were necessary to prepare for the addition.