Hypotheek Winkel : is there a FR equivalent?

Presming you mean "Boutique hypothécaire"
So: http://www.becompta.be/docs/bureau-des-hypotheques-bruxelles
http://www.patronale-life.be/FR/Produits/Hypothques/ etc

We used these twice and were great help both times - http://www.immotheker.be/FR/

I'm not sure where you're based but Joost in the office on Rue Royal (Brussels) speaks great English too - http://www.immotheker.be/Immotheker3/Site_v3/Default.aspx?WPID=308&MIID=...