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Plenty of sites sell domes. Few give an honest, cross-method comparison. Here are eight ways to build a dome, weighed on cost, insulation, DIY-ability, durability, and daylight — with the uncertainty flags left in, not sanded off.

Method Cost Insulation DIY Light Best use
Aircrete (Domegaia) Very low material (~$1–2/sq-ft per inch of shell) ~R-2/in realistic (marketed ~R-6/in is disputed) high opaque Cheap DIY off-grid shell in a dry climate
Shotcrete / Monolithic ~$130–250/sq ft ($180k–500k finished) ~R-30–60, integral foam + thermal mass low opaque Maximum disaster resistance and long service life
Timber geodesic ~$120 (DIY) – $350 (contractor)/sq ft High (R-30+); no thermal mass high opaque DIY warm, well-insulated home
Polycarbonate geodesic Kit ~$3k–30k ~R-2.8 (5-wall); poor high translucent Greenhouse, sunroom, or glamping shell
Glass geodesic Kit ~$4k–20k+; architectural much higher Worst (~R-3–8); huge solar gain/loss low transparent Views, glamping, and sunrooms
Binishell (air-inflated concrete) Shell $10–30/sq ft (tiny prototypes) Thermal mass; needs added insulation low opaque Rapid concrete shells (with proper engineering)
Bioceramic (Geoship) Founder ~$500k; go-to-market ~$90k–380k Vendor claim (independently unverified) low opaque Health/eco early-adopter kit
Earthbag / SuperAdobe (CalEarth) Cheapest materials; labor-heavy Low (thermal mass ≠ insulation) highest opaque Ultra-low-cost DIY in desert climates

Aircrete (Domegaia)

Very low material (~$1–2/sq-ft per inch of shell) · Fireproof; absorbs water; young track record

Pros

  • Extremely cheap raw materials — foamed cement and water
  • Light, saw-able, screw-able; friendly to owner-builders
  • Fireproof and pest-proof

Cons

  • Absorbs water unless carefully sealed and detailed
  • Real insulation value is modest (~R-2/in)
  • Short real-world track record; long-term durability unproven

Uncertainty flags

  • R-value dispute: independent testing suggests ~R-2/in, versus the marketed ~R-6/in derived from a non-standard test.
Vendor ↗ Sources: [1] · [2] · [3]

Shotcrete / Monolithic

~$130–250/sq ft ($180k–500k finished) · FEMA near-absolute protection; lasts centuries

Pros

  • Seamless monolithic shell leaks far less than paneled domes
  • FEMA-recognized near-absolute protection from tornadoes/hurricanes
  • Excellent insulation and thermal mass; very long lifespan

Cons

  • Expensive and contractor-built — not a DIY method
  • Opaque; daylight only through added windows/skylights
  • Specialized airform + shotcrete crew required

Uncertainty flags

  • Cost spans a wide range with finish level and region; treat $130–250/sq ft as a planning band, not a quote.
Vendor ↗ Sources: [1] · [2] · [3] · [4]

Timber geodesic

~$120 (DIY) – $350 (contractor)/sq ft · Good; combustible, rot/pest risk if it gets wet

Pros

  • Warm, well-insulated, and workable with standard carpentry
  • Strong triangulated structure; skylights add daylight
  • Achievable by determined owner-builders

Cons

  • Many hub/seam joints — the classic dome leak surface
  • Combustible; vulnerable to rot and pests if water gets in
  • Curved walls make rectangular furniture and cabinetry awkward

Uncertainty flags

  • Leaks are the defining risk of paneled domes — shingle or heat-weld a continuous membrane over the shell.
Vendor ↗ Sources: [1] · [2] · [3]

Polycarbonate geodesic

Kit ~$3k–30k · UV-yellows in ~20 yr; combustible

Pros

  • Translucent — floods the interior with diffuse daylight
  • Light panels; approachable kit assembly
  • Comparatively inexpensive per square foot

Cons

  • Low insulation even in multi-wall sheet; big day/night swings
  • UV yellowing and hazing over ~20 years
  • Condensation-prone; needs deliberate ventilation

Uncertainty flags

  • Great for plants and shoulder-season use; a poor thermal envelope for a year-round conditioned home.
Vendor ↗ Sources: [1] · [2]

Glass geodesic

Kit ~$4k–20k+; architectural much higher · Brittle; requires safety glass

Pros

  • Transparent — unbroken views and maximum daylight
  • Durable, non-yellowing glazing (vs polycarbonate)
  • Striking architectural presence

Cons

  • Worst insulation of any method; large heating/cooling loads
  • Heavy, brittle, and expensive; safety glazing required
  • Serious condensation and overheating without active climate control

Uncertainty flags

  • Solar gain cuts both ways — glorious daylight, punishing thermal loads. Best as a feature space, not the whole envelope.
Vendor ↗ Sources: [1] · [2]

Binishell (air-inflated concrete)

Shell $10–30/sq ft (tiny prototypes) · Strong, but a documented failure history

Pros

  • Concrete shell lifted with an inflatable form — fast to raise
  • Seamless surface resists leaks better than paneled domes
  • Strong in compression

Cons

  • Mass is not insulation — needs a separate insulating layer
  • Requires real structural engineering; not owner-buildable
  • History of failures if under-engineered

Uncertainty flags

  • The cheap per-sq-ft figures are for 100–200 sq ft prototypes; a 1975 Fairvale (Australia) Binishell collapse is part of the record.
Vendor ↗ Sources: [1] · [2]

Bioceramic (Geoship)

Founder ~$500k; go-to-market ~$90k–380k · Fireproof ceramic; unproven at scale

Pros

  • Non-combustible bioceramic with a luminous finish
  • Marketed as non-toxic, recyclable, and long-lived
  • Novel prefab kit approach to assembly

Cons

  • Pre-mainstream startup; delivery and price risk
  • Performance figures are vendor claims, not independently verified
  • Early pricing is high relative to conventional builds

Uncertainty flags

  • Geoship is a pre-mainstream startup: treat performance numbers as vendor claims and factor in delivery risk.
Vendor ↗ Sources: [1] · [2]

Earthbag / SuperAdobe (CalEarth)

Cheapest materials; labor-heavy · Fireproof, seismic; ICC-ES listed; moisture-sensitive

Pros

  • Cheapest materials of any method — earth in bags
  • Fireproof and seismically strong; ICC-ES evaluation eases permitting
  • The most owner-buildable, community-friendly technique

Cons

  • Very labor-intensive to build
  • Thermal mass is not insulation — poor in cold climates
  • Moisture-sensitive; needs good drainage and plaster

Uncertainty flags

  • Mass buffers desert day/night swings but does not insulate; in cold climates it needs a separate insulation layer.
Vendor ↗ Sources: [1] · [2]

Four honest caveats about dome living

  • 01

    Leaks are the defining dome problem

    Paneled domes (timber, poly, glass) have many non-vertical seams and hubs, no drainage plane, and they flex daily under solar heating. Seamless shells (Monolithic, Binishell) leak far less; shingle or heat-weld a continuous membrane on paneled ones.

  • 02

    Condensation & ventilation

    Sealed, high-solar-gain shells sweat without deliberate ventilation — especially low-R glass and polycarbonate.

  • 03

    Curved walls are hard to furnish

    Rectangular cabinetry and furniture fit curved walls poorly. Expect custom built-ins — which is partly why the one-room, few-objects layout works so well in a dome.

  • 04

    Resale, financing, insurance, code

    Non-rectangular homes face appraisal, mortgage, and insurance friction. Stamped engineering (Monolithic, or CalEarth’s ICC-ES SuperAdobe) eases permitting.

Cost, insulation, and durability figures are planning bands drawn from the sources linked under each method — not quotes. Verify locally before you build.