what clors can i paint ruins of house around the carentan area or on the way to there
what other kind of materials where used

Depends on the type of dwelling... are you talking residence, or retail buildings?

First let's look at technique for building.... A lot of the wealthier people used plaster over brick to help give a more "finished" look to their house... and if there were cracks in the plaster, it was easy to repair. Plaster also helped in terms of strength and insulation.

The working class used old brick or wood, or a combination of both. On these buildings, tthey typically used a cheap whitewash rather than paint. Which meant you often had a faded color after a year or two of weather.... White was the most common color, but they also used a lot of tan, beige, and light grey. Trim colors were often either Red or Blackish Green.

People who had more money would buy more expensive "pigmented" paints and washes, such as pastel yellow, mint green, light blue, and pink... a few used the very expensive dark color paints like Prussian Blue, Sienna, Brown, or some of the other mid-range colors. Trim on these would often be white or a lighter shade of the primary color.