The guidelines are quite conservative, leading to costly 'over-design'
I'm trying to express that these guidelines are 'on the safe side'. I saw someone use the word conservative in this context, but I'm not sure whether this is correct, because I receive a lot of frowns when using it among my Dutch colleagues. In Dutch, this word is used only for 'old-fashioned' or 'traditional'. However, I can't find a suitable alternative. Hence the question.
Edit: The guidelines are design guidelines for wind turbines. They are used to estimate wind loads. If the loads are too high, the turbine might break. So if the guidelines are 'on the safe side', the estimated loads will probably be higher than the actual loads. Naturally, you want to be on the safe side, but if the estimated loads are much higher than the actual loads, you're wasting money.