We are planning to extend by "jutting out the corner" of the house by approximately 1 meter. In other words, building out approximately 1 meter along two walls. (We are limited by the distance to neighbors.) Wooden house with a standard gable roof. Wondering about alternative solutions to pouring a slab or using a crawl space. Has anyone built with posts, or something similar? Pros and cons?
Now I don't quite understand what you mean, but if you intend to widen/extend the house by ONE meter, you will end up with a very high construction cost in relation to the square meters you gain.
A sketch of what you're thinking would help.
A sketch of what you're thinking would help.
How is the existing foundation made?
Are you going to make a new roof on both sides, or will it go up to the eaves?
Are you going to make a new roof on both sides, or will it go up to the eaves?
Such a small thing should be possible to build on a couple of sturdy foundations with posts.
It probably depends on the ground conditions? Here in the Uppland blue clay, I wouldn't build on pillars, there's a neighboring house where they did that, and a couple of pillars in the corner sank after a while.
Generally, I would have done like the old foundation, but if you don't want to do that for some reason, I would have poured a footing for the pillars to stand on in that case, but as I said, it somewhat depends on what kind of land you have.
Then my personal opinion is that 100 cm is too little to expand, it's not worth the energy, trouble, or money. You basically just have room for a few more chairs, and then it's full. In our area, several people have solved this by building upwards instead. Sure, it's a much larger operation, but on the other hand, you get something for all the effort.
Generally, I would have done like the old foundation, but if you don't want to do that for some reason, I would have poured a footing for the pillars to stand on in that case, but as I said, it somewhat depends on what kind of land you have.
Then my personal opinion is that 100 cm is too little to expand, it's not worth the energy, trouble, or money. You basically just have room for a few more chairs, and then it's full. In our area, several people have solved this by building upwards instead. Sure, it's a much larger operation, but on the other hand, you get something for all the effort.
I have been thinking a lot about building upwards. Made cardboard models of different expansion options, and drawn and sketched... But we have a very sloping plot, and already many stairs. One doesn't get younger, and I thought to see if it can be solved without adding another staircase. The existing foundation is on a slab, with a basement. We thought that the expansion should not have a basement, rather just under a meter above the existing ground. The house sits on bedrock, so no risk of blue clay. The façade should be able to be done nicely, as we plan to build a sunroom at the same time. A 100 cm extension is enough for us to add an extra bedroom, partly by eliminating a wide corridor. We also have a terrace attached to the house, and it can decrease by 1 meter without becoming too narrow, but no more. So we're considering if there are others who have built "with overhang" and what to think about before embarking on such a solution.
If the house is on rock, pillars should work with posts up to the load-bearing beam, or you can cast the piers all the way up, max 2 m between piers I've been taught. I'm not an expert on foundation, but I would have suggested the following solution to my house carpenter. Dig down to the rock, drill 3 holes per pier to attach rebar, build molds (or use ready-made paper tubes) to cast piers c/c 60 up to the correct height for the load-bearing beam, attach the 2"9 beam and frame the new walls + floor joist (it will just be one joist) build a new truss at the outermost point. Connect to the existing house, insulate according to the latest recommendation and attach the paneling.