Glue log ends in place with construction adhesive.
low cost
Popoyo

“Structurally speaking, the arch and curved walls create a much stronger building system. Just look at how long roman aquaducts have withstood time. By keeping the walls curved, you eliminate the need for costly rebar and concrete.
DIY Superinsulated Vaults

As we reported the other day, Brian Waite’s straw bale vault kit in England is an excellent option. However, many owner-builders might prefer to build their own vaulted home from scratch using locally sourced, low cost materials so as to make any size and shape they want.
Earthbag homes–easiest and cheapest green build

“Earthbag construction is a type of rammed earth construction where durable bags, usually polypropylene or burlap, are filled with local earth or other materials, laid in courses and tamped down into place to form walls. The greatest advantage is that it is one of the cheapest and easiest ways to construct a green home which with some hard work can be done by the homeowner.
Low Cost, Self-Sufficient Homestead Channel
Come take a tour of our new homestead on YouTube, where we are building a recycled wood house and forest garden — all for just a few thousand dollars.
Backyard Bioshelter
Take a tour of this low cost year-round passive solar bioshelter in Massachusetts that has raised beds, aquaculture, hydroponics and worm bed.