When you buy an existing house, you will have to consult a notary. You are free to choose which one. The prices are not regulated so make sure you compare prices. When you buy a house you need a leveringsakte (deed of transfer) and hypotheekakte (deed of mortgage). Both cost around 600 euro. When you buy a new house you will only pay hypotheekakte.
Although Dutch people generally earn well, it's always good to save money where you can. When considering hiring a notary, you'll likely first look at the costs. Comparing notary costs is something that almost every Dutch person does when a notary needs to be hired. Each notary charges different rates. For instance, an experienced notary will charge more for their services than a notary who has just started. It can, therefore, be rewarding to compare notary costs. However, if you want a good notary, it's essential not to dismiss all expensive notaries immediately.