Would have to be a particularly thin joist at the door end. Looking at the garden it doesn’t look particularly level so appears you would have to do some serious excavation anyway.
Could you get away with a floating frame on top of the concrete? Difficult to tell
Yeah garden very unlevel goes up hill slightly from door just want something flat as all the concrete is uneven thought decking would be quick cheap idea not sure if block patio is also a good idea
You could think of a split level using the door line as the lower point and then one step up to take care of the undulations, just an idea. Hope this helps.
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