What are the extras when you buy a house?

It varies slightly according to the region and as to whether you are classed as a first-time buyer.
When we bought in Flanders - we were first-time buyers - it was 12% almost exactly to the nearest Euro.
The charges are fixed so you cannot shop around for a cheaper notaris.

It depends on the price of the house, but typically add 14% to 17%
Costs include:
- Property registration tax
- Notaire fees
- Bank and mortgage arrangement fees

It's also wise to allow for removal costs, and most houses will need some work doing to them, from a coat of paint to a full blown renovation.

As J says, it depends on the value of the house, and on other factors such as where the house is located (wallonie / brussels / flanders) and whether you have mortgage, are a first time buyer, etc.

There are calculators online that will show you such as here;
http://www.notaire.be/calcul_de_frais.php

Very roughly, the range is somewhere between around 12% - 18% for official taxes and registration fees.

However, the best person to ask, as they'll know your situation, is your notaire.

Yes the best person to ask is indeed your notaire. The notaire's charges are fixed so you can ask as many questions as you like without it costing you an extra cent.

If you don't already have a notaire lined up, find one quickly, it should be the first thing that you do when you start looking for a house.

Finally, never sign anything, especially an option to buy, without speaking to the notaire first. Once you sign, and it is accepted, you are committed to buying (and the seller to selling) unless very specific conditions (usually connected to the ability to get a loan, but could, for example, cover possible "urbanism" problems) are included and can't be met.

The Bulletin organises a seminar about it next Oct 7 at ING.
It's free. You can register somewhere on this site.