Dog pees in the house only at night time

Hi

I have a 1 year old West Highland and we have been in our new house for
a couple of months. My dog doesnt seem to get it but she keeps peeing
in the kitchen near her bed. We keep making her area smaller and now it
goes as far as the utilities room but she still peeing inside the
house.

We usually walk her for 30 minutes - 1 hour but she just messes around
rather than doing her business then comes in the morning we will see
her remainings in the kitchen. Very disappointed as she was very good
in the old house. The thing is, she is very good day time, when we come
back from work she didnt leave anything messy but it seems to only
happy at night time when we sleep.....

What should we do?

Many thanks in advance.

Peddie

Thank you very much, I will try tonight and will let you know the
feedback