The back of the shop, where the doors are, is also the back of the original open car port of the old rent house. When I moved the house to this location I enlarged the garage width by 1' and length by 6' and enclosed it. That garage area is now as deep as the house/shop is wide.... and I poured a 6" slab, there, before construction. That area has 11' wide 23' long workable space, has the 8" & 16" jointers, anvil, 20" band saw and some lumber storage, plus an attic area for storage.
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A roll up or typical garage door can't be installed, the interior ceiling joists are too low. There is a hang down (from ceiling joists) shelf near the doors and some dust collection hose in the mix, there, as well. The ply doors work find, just rotting in places and I thought to have new more light weight doors made, though the present weight of the doors is not a problem with 4 heavy hinges each.
What I originally thought was, might it be more convenient to buy new doors or make new ones, myself. I thought new doors' price would be within a reasonable price. $9K+ was not reasonable, but outrageous. I'll make new doors. I priced 3 sheets of treated 1/2" ply - about $60 each. I'll go look at Lowes' Fabral 5 ribbed roofing panels - 12' long, 3.14' wide, about $70 each, I need 4 panels - and see how much they weight, compared to the ply sheets.
*What I should have said earlier was, I could build a SMALL shop for $9K. A 12'X24' slab would require about 6 yards of concrete, at $150 a yard, the slab would only cost $900.
Sonny