In the prefabricated house parks, I was always extremely amazed when I saw such a young couple and thought to myself: "Wow, aren’t they still studying? Why do they want a house already?" because at the same age on a Saturday morning I was still sleeping off the hangover from the Friday party and having a steady boyfriend was the maximum level of commitment I could imagine :) Therefore, I find it very exciting how determined you are at your age to work towards the house project, and I think you have very good conditions with your salary and the still relatively affordable plots of land in your area. However, like the previous writers, I would urgently advise not to wait if the desire for a house is already so concrete; you will never keep up with the current inflation rates, and from my own experience, I know that you have no time to lose if the condition for the plot is to have a move-in ready house there in 3 years. We bought ours in summer 2019 and are expected to move in now in March 2022. Current waiting times for prefab house companies are often 18-24 months, and believe me, there are always delays in construction. Regarding the loan amount, I would carefully consider how big your desire for children is and whether you actually want to realize it around the age of 30; you have been together for a long time, have steady jobs, and maybe your girlfriend will develop a desire for children sooner once the nest is ready. Should it be relatively certain it will be just one child, or rather two to three? That is all very hard to predict but plays a big role in the number of rooms, the possible loan amount (two or more children mean longer absences from work for your wife and maybe also very long part-time work), and your priorities (I would always sacrifice a cinema room and smart home for more space and storage for family life). Personally, in your current situation, I would rather build a modest and solid house (even without a basement) that can possibly be sold or expanded again when the child or children are teenagers or adults and leave myself much more room to still live besides saving. Maybe you are really completely different, but with two stressful jobs, everyone actually longs for at least one nice vacation, a few times dining out, or a weekend trip. Building a house is always a challenge for the relationship, and for us, it was very important that there were always nice distractions in between like a vacation or a day at the spa. We are currently planning children and to be honest are also looking forward to things that require money again (vacation at the beach, zoo, water slides, trips), just as a thought that the house topic is important but not everything :)