Answer
How do I create an outdoor room?
A defined floor, walls of planting or screens, a pergola overhead, and the kit to use it.
In short
By designing the garden like a room: a defined floor of paving or decking, walls of planting, screens or a pergola, a ceiling of a pergola, veranda or the sky, and the things that make it usable, seating, lighting, maybe a kitchen or fire. That is how an outdoor living space is designed.
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