Just an unusual request from me.
I am planning to build a house (timber frame construction) within the next 5 years and want to carry out as much as possible myself.
Therefore, I would like to offer myself as a construction helper for current house builders to gain experience in advance. I have manual skills. Primarily, I am interested in trades related to interior finishing.
[ / ] I would be able to support after work and on weekends.
The request is not original for five cents, many others had the idea before you. Nevertheless, nobody knows success stories from this idea. Unfortunately, your time availability does not fit: as a helper for self-builders you would only be useful "on demand, but just in time." That means the self-builder would have to rely on your spontaneous "yes" if he notices that he has time today; and the all-round construction subcontractor would need you at other times. Still, find such a person but take vacation for when they can use you. Usually, there are "cousins" for that; with a stranger it is too much paperwork. Or you put yourself on the day laborer line. But then you will be the last choice: recruiters have an eye for colleagues who are suitable for piecework labor.
Five years is a long time. You can well find the desired opportunities if you only search in your circle of friends and colleagues. But now to the other aspect:
I am planning to build a house (timber frame construction) within the next 5 years and want to carry out as much as possible myself.
I consider it highly unwise to commit yourself to a specific construction method several years before your own build. Perhaps you could explain why this particular method seems best suited for a. your house at all and/or b. for the incorporation of your own labor. Both the timber
frame panel- (although they prefer the popular misnomer themselves) and the masonry general contractor no longer offer all "shell houses," "almost finished," and similar self-builder construction stages.
Drywall interior partition walls and drywall bathroom walls are used equally in timber- and masonry-built houses. In the electrical field, you may only perform assistant activities, and tiling is only suitable for untrained workers in medium-sized formats (around 20 cm, neither the modern nor the mosaic formats). When pointing brickwork, you save considerably more by choosing plaster facade instead of doing the jointing yourself. What, on the other hand, has much potential and is well suited for beginners is building a (mostly aerated concrete) kit house yourself.