After the Traction was ready, I started at isolating the garage.
First 3 cm hard insulation against the half stone wall, then 7 mm waterproof plywood upright against it and every 60 cm a standing strip for the shelf supports. Then everything is made white with latex. I didn’t insulate the ceiling. I did insulate the garage door.
The previous owner made water, energy and central heating connections in the garage. The C.V. runs in winter on frost-free with a thermostat tap. When I work in the garage in winter, the central heating radiator ensures that it is reasonable to do.