Dream warmly. Check carefully.

Before you buy the triangles.

A dome can be a wonderful question to ask of a house. This is the notebook page between “I love that!” and paying a deposit. Start with the life you want to have inside it.

1. Give the daydream an ordinary Tuesday

Sketch a day, including the boring bits. Where do wet coats dry? Can one person sleep while another cooks? Where do you put a toilet, cleaning supplies, laundry and a private phone call? What happens if you need a step-free entrance or a bathroom you can use with limited mobility?

Try this: mark a roughly sized circle on the floor with removable tape. Add furniture footprints, walking routes and doors. Live with that sketch before buying custom furniture. No need to turn your living room into a construction site.

2. The shell has several jobs

It holds the building up, keeps weather out, manages heat, and handles moisture. A pretty geometry diagram does not demonstrate all four.

Structure: ask for engineering for the actual location, loads, foundations and openings. Suspended rings, nets and lofts add loads that must be designed for.
Weather: ask to see the complete water-management detail at seams, doors, skylights and the base—not just a tube of sealant.
Comfort: ask for performance of the complete assembly, including framing and glazing. An impressive material R-value is only one part of the story.
Maintenance: find out how you reach and replace the highest panel, inspect a leak, and obtain spare parts years later.

A sunny room is not automatically a comfortable room

Solar design balances window area, orientation, shading, heat storage and heat distribution. Thermal mass stores heat; insulation slows its movement. They are different jobs. The U.S. Department of Energy’s passive solar guide is a useful starting point, not a dome-specific performance test.

A mostly glazed room deserves a climate-specific overheating and heat-loss assessment. A plant-filled interior with bathing and cooking also deserves a deliberate ventilation and moisture plan. Ask a building professional to work through the whole system with you.

3. Ask for the whole-house number

The number on a kit page may cover framing, panels, or a shell. Those are different shopping baskets. Even a dome supplier’s own catalogue separates framing, shell, foundation and finishing components.

Make each quote spell out:

Land and site: surveys, access, excavation, drainage and foundations.
Shell: structure, covering, insulation, windows, doors, transport and assembly.
Services: water, wastewater, electricity, ventilation, heating and cooling.
Living in it: kitchen, bathroom, surfaces, storage and accessible circulation.
Project costs: design, engineering, permissions, labour, contingency and financing.

Keep the size definition consistent: floor area is not shell surface area. Record currency, location, date, tax and whose labour is included. There is no trustworthy universal “dome price per square foot.”

4. Find out what the local office needs

Before ordering a system, describe the intended use and site to the relevant local planning and building offices. Requirements differ. A vendor’s history of approvals elsewhere is useful context, not permission for your project.

ICC explains how evaluation reports help building officials assess alternative products. Read their conditions and limitations. For example, CalEarth’s builder resources describe a report for a specific cement-stabilized earthbag system and call for professionally stamped drawings. That does not make every earthbag dome pre-approved.

Useful question: “Which documents, tests and professionals would you need to review this particular proposal?” Ask insurers, lenders and potential contractors similarly specific questions early.

5. Translate the exciting claims

“Disaster-proof”

Ask: which hazard, which design load, and which independently checked assembly? FEMA’s safe-room guidance applies defined criteria to complete safe rooms. FEMA does not certify products or contractors. Being a dome, or being concrete, does not by itself establish safe-room performance.

“Self-building” or “easy DIY”

Ask what the demonstration leaves out: foundation, services, waterproofing, safe access, equipment, approvals and finishing. Workshops may be a good way to learn, but a successful workshop structure is not proof that your home will be simple to deliver.

“Natural,” “non-toxic,” or “zero maintenance”

Ask for named materials, coatings and test reports rather than a broad label. Ask for a maintenance schedule, warranty exclusions and examples you can visit. A material can have useful properties without making the entire building effortless.

Your next small step

Write a one-page brief: who uses the space, where, in which seasons, doing what, and with what total budget. Then compare construction approaches and follow the sources. If possible, visit an occupied dome in weather like yours. Bring questions. Bring a sweater if appropriate.

Research reviewed October 10, 2026. This is an educational design guide; a site-specific design needs qualified local professionals.