Depends on what your level of expertise is, and what tools you have access to. It looks as if the hinge side joint has pulled at the top, and because the bottom rail is useless, the door has dropped. TBH, I'm not a joiner, I'm a furniture maker, but for an external door I'd have expected some bracing.
I'd take the door off, carefully take it apart as far as possible, which may well be completely, and make a new much deeper bottom rail, or glue another piece onto the edge of the existing piece to save machining the groove. Id cut a full width tenon on it, and cut up the bottom of the stiles (uprights) to take the tenon and make a bridle joint. I'd take out and shorten the panel and recut the rebate or tongue on the bottom, depending on how it fits. Then I'd re-glue the door together, using draw bored oak dowels and glue at the corner joints to pull it all together.
It's a lot of fiddling really. I've got a feeling than if you do anything else though, the door will fall apart after a while.
I'll just add, that obviously if you do take the door apart, then be sure of what you are doing, and preferably have something to replace it with temporarily if you need to leave it for some reason.
It's a load of grief to sort out something that shouldn't have been done like this in the first place.
I'd take the door off, carefully take it apart as far as possible, which may well be completely, and make a new much deeper bottom rail, or glue another piece onto the edge of the existing piece to save machining the groove. Id cut a full width tenon on it, and cut up the bottom of the stiles (uprights) to take the tenon and make a bridle joint. I'd take out and shorten the panel and recut the rebate or tongue on the bottom, depending on how it fits. Then I'd re-glue the door together, using draw bored oak dowels and glue at the corner joints to pull it all together.
It's a lot of fiddling really. I've got a feeling than if you do anything else though, the door will fall apart after a while.
I'll just add, that obviously if you do take the door apart, then be sure of what you are doing, and preferably have something to replace it with temporarily if you need to leave it for some reason.
It's a load of grief to sort out something that shouldn't have been done like this in the first place.
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