Quoting: Mark3181
All I need to Know are the chances of establishing a business in this sector viable?
You will have to compete with those who understand and to a certain extent control the market. Your biggest problem would be employees. The Polish working day finishes at 14:00 for some so it it is easy for them to make money with a ''homer''. With bigger jobs teams of workers will move from their regular work to ''cash in hand jobs''.
You might be better off running some sort of management team in conjunction with a trusted local.
Whatever you do, make sure that you are familiar with Polish building regulations. And you must have an understanding of how people work here.
Like anywhere else most work is based on your reputation. If you start out on your own and are good you will make money but of course after some time.
Big tip: With new builds the client almost always wants the bathroom done in one. So if you can do the tiling and plumbing you've got it made. Specializing will keep other people out of your way.