Home/Production/The Holm Line/Holm 3
Family of six
Holm 3: 3 steel cubes, sleeps 6.
Entry, kitchen and bunks for six, in a straight run or turned into an L to fit the ground you have.
Layouts
Shaped to
your ground.
The same 3 cubes, arranged to fit the space you have. Open any layout in the Builder to turn it in 3D, move rooms and add cubes.
Specifications
| Cubes | 3 steel cubes, 10 x 10 ft outside, about 9 ft 4 in square inside |
|---|---|
| Floor area | 300 sq ft footprint; about 261 sq ft inside, plus the open joints between cubes |
| Ceiling | 8 ft finished ceiling (planned; set in engineering) |
| Shapes | 10 x 30 ft, L, or any custom shape |
| Sleeps | 6 |
| Parts in the recommended layout | 4 mate packages at 2 joints, 1 exterior door, 1 emergency exit, 6 end caps |
| Fresh air | About 240 cfm, filtered (40 cfm a person) |
| Air filtration | Blast valve, pre-filter, HEPA and impregnated carbon, positive pressure, hand-crank backup |
| Shielding | Designed for a protection factor of about 1,000 in the living space |
| Stored water | 180 gallons minimum (1 gallon a person a day for 30 days) |
| Radon | Sub-slab mitigation, tested below 2 pCi/L |
| Exits | Exterior door on the entry, plus an emergency exit on a different side |
Layouts shown are recommended starting points. Every Holm is engineered and stamped for its site, soil and water table.
What it costs
For comparison, published ranges for 300 square feet of underground construction: $90,000 to $180,000 finished and earth-sheltered, $240,000 to $360,000 hardened with NBC filtration, before land and site work (ThePricer). Cube prices are preliminary until engineering is complete.
Questions
About the
Holm 3.
Are these layouts ready to build?
They are recommended starting points. Every Holm is engineered by a licensed structural engineer for its site, soil and water table, and the stamped drawings are produced in design.
Can I change the layout?
Yes. In the Bunker Builder you can move cubes, change what each one is for, add cubes and move the door and the exit. The spec underneath, air, filtration, shielding, radon and exits, does not change.
How is the price set?
Each layout is priced part by part, and you add systems in the Bunker Builder at published prices. The final price is confirmed in writing after the site visit, because the ground, depth and access change the work.
Make it yours.
Tell us about your household and your land, and we will lay out the cubes to fit both. Consultations are private.