Cut timber yourself or approach a company

When do you want to build? How will you dry the wood until then? Can you manage without glued laminated timber? How do you ensure the quality? Sounds like a good idea for a garden shed, but I advise against it for a residential house.

The wood quality, drying, transport, sawing, I think it is better if you buy the construction timber. Maybe you can have it cut for the table, raised bed, fence, I don't know.

Additionally, there may possibly be warranty issues / problems. The carpenter will always claim that it was your wood. Although not much can go wrong there. I would sell / use the trees like this now, too many dependencies only make the construction planning unnecessarily complicated. The savings to be achieved are unlikely to be in the four-digit range if you possibly deduct the proceeds / utility value of the trees.

Well, selling the trees quickly is certainly easy, but the value is currently ridiculous and not an option for us. Firewood - at least you would get something out of it, but using trees that are meant for construction wood for that purpose is a waste. Storage will not be the problem. Construction wood is stored outside and screwed together to prevent twisting, etc. This used to be common practice. Is the savings really that minimal here? You definitely should not include the effort upfront in the calculation, because the wood has to be cut anyway.

My father had gotten wood from the forest, had it sawed, planed it himself for ceilings, furniture, etc. We have now used some of it for raised beds and for the dining table. It lay in the barn for over 30 years without any worm damage. Thick larch planks are at the carpenter's drying room. I don't yet know what we will make from them. Might also be something for you.

I also tend to think that it can only get more expensive, better make firewood out of it and install a big stove. You'll benefit more from that.

I have to strongly disagree with you: the carpentry and joinery Stark in Auhausen recently built their new storage hall out of beetle wood and describes it as one that is actually only selectively used due to discoloration, although it is otherwise fully operational.