Utility room

Hi all, I am thinking about building a partition in my garage, which is linked to the house. The idea is to build a partition of about 3x2 meters, so we can install the washing machine and a cupboard. I was thinking about getting someone to do the plumbing, but do the rest myself: wall partition with a door, raised floor (chipboard) insulated, and plasterboard for the walls. The existing window would be in this partition, but the rest of the garage wouldn't have a window now.
I was wondering if I need planning/building permission for this sort of work?
The house is in Hertfordshire
Cheers
MG
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It is doubtful if planning would be required but building control certainly would be if for nothing else the fire prevention requirements from a garage to the habitable housse would change. Check with your local authority, you will find them extremely helpful. As I do a lot of my work in Hertfordshire, I have no problem with them at all
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