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I have a small crawl space (8' wide) under the porch of my 1920s home. The door (2' wide) is currently near/next to the house. We would like to move the door to be away from the house so we can put an AC compressor in front of where the door currently is.

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It is not obvious to me what is load bearing or even what the construction material is. Can I make a new door about 2' to the right of the current opening and then seal up the old opening?

Will it be much harder to make the opening if the AC compressor is in place before doing the work so that there is no immediate inside access?

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It appears to me that all of the vertical walls are load-bearing. If I assume the roof to the crawl space is a reinforced concrete slab, it's live and dead loads would likely bear parallel and perpendicular to the side walls.

You can move the opening. But because the existing construction of the crawl space roof is unknown and, like-wise, exactly how it bears on the walls, I suggest you create the new opening in a mirror image to the existing opening. In other words, from your picture, use the measurement from the left side of the opening to the wall to the left as your new right side opening measurement from the corner, but do add to that length the width of the the wall.

Lastly, yes it would be more difficult to do the work after adding the new AC compressor because it is best to fill the existing opening with load-bearing material, such as concrete block, and finish the exterior to best match the walls. Once that's finished you won't have a possible interference with the AC compressor.

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