Montana Shelters
A site-assessed, permit-ready shelter with blast door, CBRN filtration, and reinforced concrete walls built to your property’s actual conditions.
What Goes Wrong
A shelter dug to a standard depth without a soil load calculation can crack under freeze-thaw pressure or shift in clay-heavy ground.
Concrete wall thickness and rebar sizing are set from the actual soil bearing result, not a generic template.
Waterproofing membrane and perimeter drains retrofitted after backfill require full re-excavation, doubling site disruption and cost.
The perimeter drain and sump system are scoped from the water table finding before excavation is sized or priced.
A filtration unit sized for a smaller space cannot maintain safe air quality during sustained occupancy under a contamination event.
The HEPA H13 filtration unit is sized to the shelter’s occupied cubic footage and the intended occupancy duration.
Striking an unmarked utility line mid-excavation halts the project, triggers re-design, and adds unplanned cost to every phase that follows.
Utility locating is completed in the scope review phase so the excavation footprint avoids conflicts before equipment is mobilized.
Scope of Work
Each phase is quoted separately so you see exactly what drives cost before any work begins.
Soil testing, water table check, and utility locating establish what the site can support before excavation is scoped.
Excavation depth is set by the structural load calculation, not a standard figure, accounting for Montana frost depth and soil variability.
4,000 PSI concrete walls formed with rebar reinforcement sized to the soil load, with the blast door set during the structural phase.
CBRN-rated HEPA H13 filtration ducted and rough-wired before the slab is poured, sized to the shelter’s occupied volume.
Waterproofing membrane applied to exterior walls before backfill, with a perimeter drain and sump system designed around the water table finding.
Rated blast door set during the structural phase.
Conduit and rough-in positioned before the slab pour.
Controlled backfill compaction after waterproofing is applied.
Secondary exit scoped to the structural design.
Site-First Build
Frost depth, soil variability, and utility conflicts on Montana properties are resolved before excavation begins, not after.
Soil testing and utility locating are the first steps on any Montana property. Clay-heavy soils retain water and shift under freeze-thaw cycles, which affects both drainage design and the concrete wall specification. Rocky foothills may require different excavation equipment and longer mobilization. Rural properties often have wide yard access but can have high water tables in low-lying areas, a perimeter drain and sump system are designed around that finding, not added as an afterthought.
Excavation is scoped to the structural depth required for the soil cover load and the blast door threshold. Concrete walls are formed with rebar reinforcement sized to the soil load calculation, and the blast door is set during the structural phase. Air filtration ducting and electrical rough-in are positioned before the slab is poured. Waterproofing membrane is applied to exterior walls before backfill compaction begins, because retrofitting it later requires re-excavation.
Cold-weather construction windows in Montana affect concrete curing schedules, and the installer plans pour timing around minimum temperature thresholds. A shelter built to withstand overpressure and sustained occupancy is a different structure from a basic storm shelter, the ventilation spec, door rating, and drainage design all reflect that. The scope review makes those distinctions clear before any equipment is mobilized.
Why Choose Us
Every enquiry is reviewed for site-specific conditions before it moves to a quote, so the quote reflects your property, not a generic estimate.
Site access, soil bearing, water table, and life-support needs are reviewed before your enquiry reaches an installer.
Excavation, structure, waterproofing, and commissioning are quoted as separate line items so cost drivers are visible upfront.
Equipment access routes, drainage grading, and utility conflicts are identified in the scope review, not discovered mid-build.
Enquiries are scoped for Montana frost depth, clay soils, and cold-weather concrete scheduling.
Filtration unit size, door rating, and drainage spec are set to your shelter’s occupancy and intended use, not a standard package.
How It Works
01
Tell us the parcel, the build area, how heavy plant would reach it, and what the shelter needs to support in terms of occupancy and systems.
02
We review site access, soil and water table findings, utility conflicts, and life-support requirements before your enquiry moves to a quote.
03
The quote breaks excavation, structure, waterproofing, and commissioning into separate line items based on your actual site conditions.
Pricing Estimates
| Job | Typical cost |
|---|---|
| Small basic shelter | $40,000-$80,000 |
| Mid-range bomb shelter | $120,000-$250,000 |
| Large premium shelter | $350,000-$700,000 |
Tell us the parcel, the build area, and what the shelter needs to carry. We review the scope and move it to a phase-by-phase quote.