The next question I read in the newspaper this morning. Because this question, accompanied by the answer, also include the Bickersgracht I placed him here.
Why are the ceilings of the Dutch Canal Houses so high?
The high ceilings are a result of the high windows. The higher the windows, the more light could enter in order to provide the houses of light.
The tax on houses was then determined by the width of the facade. Many houses were relatively narrow, but very deep. Except daylight it was dependent on candles.
Glass making was a costly, high windows were a sign of status. Many old houses have windows partitions, because it was not possible to make large areas continuous glass.
source: de Telgraaf, zaterdag 5 oktober 2013