From the examples you gave, a filter would probably not make a difference. Except when there are sharp color differences, a filter does not affect contrast. Development does affect contrast, and slightly longer development would give you more. You can also compensate in Lightroom.
A medium yellow filter is usually considered to be a correction filter rather than a contrast filter - it renders the light values in a daylight shot more closely to what the eye sees. It is generally a good idea to use one for general shooting. Contrast filters - red, orange, green, blue, etc. - lighten the appearance of colors similar to them and darken their complements. With a red filter, for instance, the bricks in your red brick building shot would appear light gray. They are quite useful in many black and white situations.