Well I'd challenge the need to own your own house??? The Swiss view would be that you should rent a place that is suitable for your needs at the time - a small place to start of with, then something larger for the kids and back to something small again after the kids leave home. A large place involves a lot of work, especially if there is only two of you and you are retired. Then there is the financial aspects, again the Swiss would consider it very silly to place all your savings in one one asset and then add borrowings on top of it, with the risk that it might easily be worth less when you go to sell it, if you even can sell it... this is actually a common view in mainland Europe.
If I was you I would go on renting, even after the kids come along and continue to build up a savings fund for as long as you find something suitable to rent. You can always use the fund to cover the kids education, as a deposit on a property if needed, retire earlier or whatever.
I know it's not the common view, but then look at all the people who have been left in financial difficulties by following the common view in both this and other housing bubbles. You know most Europeans might be described as being "concerned" about the economy, but they are not in financial difficulties like here!