Cellular Concrete Panel HousesKen Land
Cast concrete panels on steel studs

A concrete house, cast as panels, built in days.

Pick the size, roof, rooms and finishes; the price updates as you go. Watch the build from the casting bed to the roof membrane, then walk through the rooms.

Design your house Watch it builtWalk through
40 by 28 foot cellular concrete panel house with a shed roof rising toward a wall of view windows, seen from the front corner

Choose a roof

Same walls, three roofs. Every roof is cast in strips at our plant and lifted on by crane; pick one and the whole house is priced from it.

Shower houses

A private-bathroom unit cast in our plant on a steel skid: delivered by truck, set by crane or forklift, plumbed and powered on site.

One or two lockable rooms, each with a shower, toilet and sink; accessible or standard chosen per room; widths of 10, 12 or 14 feet so the unit travels on an oversize permit with no pilot car. For RV parks, campgrounds and job sites.

One bathroom, 10 × 12

1 bath · standard · 10 × 12 · on a steel skid

10 ft wide · needs a road permit, no escort · about 20,000 lb

$73,600estimate
Open
DetailsWatch it builtWalk through
Design a shower housePick the width, length and rooms; the price and the road facts update as you go.

Saved designs

A saved design is a house Ken Land configured. Open it to see it priced and built, or scan the code to open it on your phone.

Shed roof to the view

40 × 28 · 2 bed 2 bath

$297,800estimate
Open

Flat roof on 10-foot walls

40 × 28 · 2 bed 2 bath

$284,300estimate
Open

Gable roof, 4:12

40 × 28 · 2 bed 2 bath

$306,700estimate
Open

Terracotta, three bedrooms

56 × 36 · 3 bed 2 bath

$420,100estimate
Open

See it built: 40' × 28' house, 2 bed 2 bath

Same walls, three roof designs. The links below open the animation already set to that design; the switch in the control panel changes it live.

Design and price your own house

Pick the size, roof design, rooms, windows, foundation, heating and finish level; the price updates as you go from the same cost basis as the estimate workbook. Four tabs: Price, Exterior (wall, trim, roof and door colours, door styles, window frames, lights, with a live 3D view and a saved rendering), Floor plan (drawn for the chosen size and rooms) and Walk-through. Every design gets its own link and an animation of the build.

Renderings

Exterior renderings saved from the configurator (Render image on the Exterior tab): every house preset and every shower house, corner view. Natural grey is the cast cladding with no coat; every other colour is a coat priced on the Exterior tab.

Plans and roof options

Working files Estimates (Excel) · Roof panel — Jamaica studio, 25' × 21' · Design documents · Montana: becoming an approved manufacturer

Estimates (Excel)

Blue cells are inputs, yellow cells are prices and assumptions to replace with quotes; the Summary tab is the page to show. The per-model workbooks have their selectors preset to that model and check against the pricing engine to the dollar; the builder markup is 15 % by default as a live cell in every workbook.

  • House estimate — walls, roof, everything else

    Complete house: roof design (flat / gable / shed), foundation (slab, floor panels site-built, or floor panels from our plant), walls, roof, plumbing, electrical, heating options, kitchen, baths, flooring, doors and windows, finishes, site and soft costs. Manufacturing tab prices the panels (plant cost + overhead + margin) and the Summary buys them at that price.

    114 KB

  • Shower house estimate — the reference unit

    Movable bathroom unit on a steel skid, 2 bath (one accessible) 12 × 20 outside: walls, roof, floor panel and skid at the plant sell price, fixtures and finishes, delivery and set; selectors for the shower finish, skid finish and roof; 15 % builder markup by default as a live cell.

    113 KB

  • Profit summary

    Profit per unit type, manufacturing profit vs builder markup, live markup cell.

    12 KB

  • House 40 × 28, shed roof, slab on grade

    2 bed 2 bath house, shed roof to the view (Option 3) on a slab (foundation A); selectors preset to shed / A; 15 % builder markup by default as a live cell.

    116 KB

  • House 40 × 28, flat roof, slab on grade

    2 bed 2 bath house, flat roof on 10' walls (Option 1) on a slab (foundation A); selectors preset to flat / A; 15 % builder markup by default as a live cell.

    115 KB

  • House 40 × 28, gable roof, slab on grade

    2 bed 2 bath house, 4:12 gable roof (Option 2) on a slab (foundation A); selectors preset to gable / A; 15 % builder markup by default as a live cell.

    116 KB

  • House 40 × 28, shed roof, floor panel from the plant

    2 bed 2 bath house, shed roof to the view on strip footings with the floor panel bought from the plant (foundation B-plant); selectors preset to shed / B-plant; 15 % builder markup by default as a live cell.

    116 KB

  • Shower house 10 × 12, 1 bath standard

    The smallest unit: one standard bathroom and the mechanical closet, 10 × 12 outside on its skid; selectors preset to flat roof / tile / painted; 15 % builder markup by default as a live cell.

    112 KB

  • Shower house 12 × 14, 1 bath accessible

    One accessible bathroom and the closet, 12 × 14 outside on its skid; selectors preset to flat roof / tile / painted; 15 % builder markup by default as a live cell.

    112 KB

  • Shower house 12 × 20, 2 bath, one accessible

    The reference unit: one accessible and one standard bathroom, 12 × 20 outside on its skid; selectors preset to flat roof / tile / painted; 15 % builder markup by default as a live cell.

    113 KB

  • Shower house 14 × 24, 2 bath, both accessible

    The largest unit: two accessible bathrooms, 14 × 24 outside on a three-runner skid; selectors preset to flat roof / tile / painted; 15 % builder markup by default as a live cell.

    113 KB

  • Roof panel estimate (studio)

    Materials takeoff and cost for the 25' × 21' roof panel with the same manufacturing model: plant vs site lines, Manufacturing tab, the roof bought at its sell price; floor options tab.

    43 KB

  • Thermal R-value workbook

    Layer-by-layer R and U for the wall, roof and floor from the cellular-concrete k-value (yellow: replace with the ASTM C518 result on our mix), steel-stud bridging by two methods, mass-wall heat capacity, IECC 2021 comparison and the inches of added insulation to close each gap.

    70 KB

Roof panel — Jamaica studio, 25' × 21'

The original lift-in-place roof panel project: cast in a ground form, craned onto printed walls, top pour and membrane.

Design documents

Montana: becoming an approved manufacturer

The research behind becoming an approved factory-built building manufacturer in Montana: the statute and the rules themselves, how a plant actually gets approved, which codes each product falls under, what the in-plant quality manual has to contain, and how we meet the off-site construction standards. This is working material with open questions, not settled advice — anything that could not be confirmed says NOT CONFIRMED, and a written answer from the Building Codes Bureau beats every word of it.

Researched 13 September 2026 against the statute, the Administrative Rules of Montana as mirrored by Cornell LII, the bureau's own pages and the ICC/MBI standards; every claim carries a source URL and the date it was fetched. Read in order, or start with the approval mechanics.

  • Start here — Roadmap: where we stand and what happens next

    The front door to the set: no new research, it pulls the other documents together. Where we stand today (two products, no approvals), the order the program forces — quality manual, then model plan, then third-party plant certification, then a built unit, then a $40 insignia per serial number — what it costs, a decision register, what can be done this week, and where the research documents disagree.

    657 lines · 45 KB

    Markdown file
  • Layer 1 — Statute and rules

    The law itself: Montana rewrote and renumbered its whole factory-built building rule set effective 21 September 2024 (ARM 24.301 moved from subchapter 5 to subchapter 12) and adopted ICC/MBI 1200-2021 and 1205-2021 by reference. Every rule is quoted from the live text, checked for a repeal marker first.

    1,328 lines · 91 KB

    Markdown file
  • Layer 2 — The approval process

    How you get from an empty plant to a labelled unit leaving the yard: who the Building Codes Bureau is and how to reach them, every form and document they ask for, the fees, third-party agencies, timelines, what triggers a re-submission, selling a unit out of state, field inspection, and the critical path.

    856 lines · 58 KB

    Markdown file
  • Layer 3 — Codes and classification

    Which code editions are actually in force in Montana and how each product gets classified — the cast wall panel as a panelized system, the shower house as a complete unit on a skid — with occupancy and use, accessibility, the energy path, the structural checks a transportable unit needs, the plant plumbing and electrical line, and a gap table.

    840 lines · 78 KB

    Markdown file
  • Layer 4 — What the quality manual must contain

    ARM 24.301.1223 does not write its own content rule; it points at chapter 5 of ICC/MBI 1205, so the manual is written to that standard section by section with the bureau's own web-page items folded in — plus what a cellular-concrete plant has to add, every form and log needed on day one, why manuals get rejected, and a recommended structure.

    1,038 lines · 77 KB

    Markdown file
  • Layer 5 — Meeting the off-site construction standards

    What ICC/MBI 1200 and 1205 actually require of a panelized-system producer, three routes to compliance compared with what each one costs and buys, and what has to exist in the plant and on paper to take the chosen route. Cross-references layer 4 rather than repeating it.

    1,577 lines · 126 KB

    Markdown file
  • Questions for the Building Codes Bureau

    One consolidated list to send: the open questions from every layer, de-duplicated and ordered so the earliest answers unblock the most work, with who to send it to, a covering email to copy, and the questions deliberately left off because they belong to somebody other than the bureau.

    400 lines · 24 KB

    Markdown file
  • The quality assurance manual (draft)

    The manual Montana requires before plan review, written to chapter 5 of ICC/MBI 1205: scope, the quality role and its independence, document control, the plant and its stations, concrete control, in-process inspection with hold points, in-plant testing, nonconformance, labels and traceability, release, transport, erection instructions and records. A draft: 149 items for Ken to confirm and 110 acceptance criteria for the engineer to set, none of them invented.

    2,019 lines · 140 KB

    Markdown file
  • The manual's forms (Appendix A)

    All 34 forms and logs the plant needs on day one, drawn out with their fields and the written procedure for using each: batch and density, cylinder casts and breaks, bed and form, mesh and embeds, lifting inserts, dimensional and surface, station sign-offs, receiving and certifications, calibration, nonconformance, corrective action, the insignia register, final release, and the plumbing and electrical test records.

    1,779 lines · 86 KB

    Markdown file
  • What the manual cannot say yet

    The 77 open items behind the draft, grouped and each with an owner and what it waits on. Read this before sending the manual anywhere.

    295 lines · 30 KB

    Markdown file
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