For context, my girlfriend's parents have offered us the opportunity to build our own detached house beside their own (they have an unusually large garden in Dublin). It would be detached and we'd have our own garden walled off from theirs.
With the extreme cost of new builds and second hand homes in Dublin, financially it is a no brainer as the site would be essentially free and their is a contractor who has quoted €275k for a 3 bed with a converted attic. I also like the idea of designing our own house from scratch to our specifications.
I get on with her parents extremely well however I do feel that I'm becoming an extension to them rather than putting down our own roots and starting our new life where we'd build a family together.
All thoughts and experience would be greatly appreciated, thanks!