37955 Bridge Road, North Branch, MN. 55056


Our office dome - One of 8 domes at our headquarter's facility.

The House of Tomorrow was filmed using 4 of our domes during July 2016. Click here for more articles on the film The House of Tomorrow.


About Us...










 From our home to yours...

The best dome home around.




















Natural Spaces Domes believes we can produce and live in a home causing considerably less detrimental impact to this Earth. We will continue to change and alter our dome building system with this in mind.

Natural Spaces Domes is located 40 miles north of Minneapolis/St. Paul Minnesota. We have an office dome, 3 model dome homes, a screen dome and 2 workshop domes. We invite you to visit us when you are in the area.

At the heart of our dome home system are the Super-Lok© patented connector system and Super-Wal double strut framework. Our dome technology is the most advanced in the industry - with good reason. It's based on in-the-field dome building experience starting in 1971. It's also based on all those enjoyable years living in domes since 1975.

Like no other dome you can buy, Natural Spaces Domes are easy to build, uniquely designed, and fantastically energy efficient while providing you the best housing value around.

Dennis Odin Johnson and his wife, Tessa Hill, own and operate Natural Spaces Domes.


Here, in Dennis' words is his dome building history: "I worked for 10 years as an architectural designer for a firm in Los Angeles and Minneapolis during the 1960’s. I read about and visited domes in the late 60’s. I drew up plans and built a few models up to 16’ diam. in my backyard.  With a carpenter friend, we started to build and sell small domes.

We began selling dome kits from Dome East (New York) and Domes and Homes(New Jersey). My late wife, Janet, and I formed The Big Outdoors People in 1971 and then opened The Dome Store in 1972 in Minneapolis.

We met Bucky Fuller after we were contracted to help set up his traveling exhibit that came to Minneapolis in 1974. This included driving (really just steering) his Dymaxion car and setting up a tensegrity structure.

We created our own dome building system selling over 350 domes before we sold the company in 1978 to partners we had added. The day after we sold TBOP, we formed Natural Spaces Domes (there’s a longer story that I won’t go into). We redesigned the connectors, eliminating early problems and updated the building system and materials.

We built a 10m/33’ diam dome as a display model for the Minnesota State Fair in 1973. That’s where we started selling solar-collectors, wind and methane generators, composting toilets, solar cookers and everything else related to alternative energy systems.

Natural Spaces Domes got into green and healthy building in the early 1980’s. We learned how formaldehyde and other building material chemicals detrimentally affected our family and, consequently, sought out clean, green materials, building techniques and mechanical systems.

We increased R-values, offering insulation levels of R-50 to R-80. We eliminated OSB/chipboard as our triangle panel material, switching to ¾” plywood. We used 90% of our 4’ x 8’ panel cutoffs in making our Super-Wal double strut dome frame, offering 12”, 15”, 18”, 21” and 24” frame thicknesses (all for the same price). We ventilated our fiberglass insulation systems, eliminating condensation problems. 


Dennis Tessa  

Natural Spaces Domes uses FSC certified Select Structural Southern Yellow Pine as our structural frame to which we attach our unique Super-Lok or Ultra-Lok metal connection hardware. To further eliminate interior chemicals, we use 1x8 T&G spruce to make one-piece interior triangles. These panels do not

need to have any finishes or sealers added. This eliminates sheetrock, taping, sanding, priming and painting along with having to redo or repair sheetrock.  Our dome building system is extremely resource efficient. We have tried to utilize the synergy of the geodesic dome, learning from meetings and discussions with Bucky Fuller in the mid 70’s. Working with our engineers over the years, we eliminated unnecessary framing and bracing, saving hundreds of lineal feet of lumber. 

I have been happily living in a dome home for 35 years. Janet and I designed and owner built my first dome, a 44’ diam. split truncation (one half was 6/12, one half was 5/12), 4 frequency, 2x6 shell with foam insulation. The three floors and the dome stepped down the hillside site. Attached to that was a 26’ diam. ½ truncation, 2 frequency dome which had two 12’ diam. icosahedron dome kid’s bedrooms bolted to and suspended from the pentagons. This was 1975 and there were no building inspectors.



We took two pre-teen girls from their friends and schools in the city and moved to the country to live in a very strange home. By the time they graduated from high school, they were asking if there

was any way they could take their domes with them.

We made several major changes to that dome over the years, removing the formaldehyde insulation and enlarging the dome shell to 15” thick, using fiberglass insulation get an R-44, and rearranging the entire interior plan. We eventually tore down the attached 26’ dome and erected a 36’ high profile (5/9), 3 frequency dome office with a full basement.

After my wife Janet passed away in 1999, I met Tessa. She runs a non-profit called Kids for Saving Earth. Tessa and I eventually decided to build a new dome incorporating all of our green, environmentally friendly building ideas and techniques. Bear Creek Dome was finished 2 days before we were married inside with 125 guests (pressure? not much!) in October 2007.

Bear Creek Dome is a 49’ diam. ½ truncation, 4 frequency, 18” shell using fiberglass insulation with an R-57. The dome is heated with radiant water tubes in the 2100 sf main floor slab. This also radiantly heats the 1100 sf upper floor.  Heating costs in our severe cold, 9000 heating degree-day climate were 25¢ per square foot for the year ($800 total). We also have a test with 5 different types of under slab insulation – you can see the results online.Dome School

Our cooling cost for the first 2 summers was $0 !  We never had to turn on the AC as it never got any warmer than 74 degrees inside even though it was 95+ outside. In the evening, we were able to open the upper cupola windows and the lower riser wall windows and cool down the house. In the morning we would close up everything and it would stay cool all day. The house is occupied all day because Tessa’s office is in the dome.

We have two high efficiency (16 SEER) Friedrich mini-split AC units, one 18,000 BTU unit in the open part and one 9,000 BTU in the master bedroom. This summer, because of the high humidity and heat, we’ve had to turn on the master bedroom unit when the evening outside temps stayed above 72 degrees. But, we cooled the whole house with the 9,000 BTU unit.

Our dome has been a joy in which to live and entertain. Would we change anything? Probably – but not for a while. I’ll continue to design, manufacture and build domes, changing, improving and listening to our customers. I’m looking forward to what the next 40 years will bring.

Our Company

At Natural Spaces Domes, we are proud of our other employees, their commitment and their expertise:

Tessa Hill, Dennis' wife, brings her organizational skills as head of Kids For Saving Earth, and board member of Healthy Child Healthy World. She was also an active board member of Beyond Pesticides for 12 years and served on the President's Advisory Board for Children's Health. Keeping Natural Spaces Domes focused on what really matters - that is the next 7 generations and the health of spaceship Earth;

   Nancy is usually explaining the "ins and outs" of domes to new customers calling along with her other office manager duties;

  Dick has over 18 years experience in manufacturing and constructing domes.
He is also our skylight production specialist.

  Tim works as part of the NSD team in customer service (he may be the first one you talk to upon calling) and handles all of our computer technology issues including server, network, and computer maintenance, as well as advertising and our printed publications.

   We have several other valuable employees in the shop and office, all ready to help you build a better dome home.

In the 1970's extensive computer engineering of the dome shell was done by Hanley Associates and E. S. I. Engineers. Paul Durand, P.E., S.E., is our current consulting engineer with many years of dome experience. He can provide dome engineering certification for all 50 states. Dome Engineering.

Natural Spaces Domes is a licensed Minnesota contractor (LIC# 7806) Qualified to build residential and commercial structures.. We specialize in working with owner-builders and owner-contractors.

An important affiliation is our association with EEBA (Energy & Environmental Building Association). We participate in their training seminars and constantly review, investigate and implement the latest, most accurate data and information on building energy efficient, healthy to live in, environmentally friendly houses.

We are constantly refining the way we design and build domes using the inhabitants health and the health of our planet as the most important criteria.

There are many other dome companies who produce domes. You are not buying a simple pre-packaged kit. You are starting the process of what normally is your largest personal investment--your home.

We offer what you need...direct help from people who really know domes.

Natural Spaces Domes has designed a simple pre-engineered dome building system that is a true owner-builder home. If you are not the owner-builder type, we offer assistance in the following ways:

  • Natural Spaces Dome Construction School for owner-builders or your contractor.
  • Natural Spaces construction supervisor/assistant to work with you or your contractor in erecting Natural Spaces components.
  • Natural Spaces builder-dealer to build it for you or help you do it (very selected areas)
  • Referral to a local contractor who has built a dome.
  • Natural Spaces can recommend construction crews to build...permanent wood foundation, floor systems, dome shell, shingling, and siding. They can also install skylights, windows, doors, insulation, or interior panels.

40' high profile - Wisconsin

Natural Spaces Domes:

  • We specialize in building a dome home that will be a healthy living environment for you and your family.
  • a totally new experience in living - a spacious, open, airy environment.
  • the ultimate energy penny pincher.
  • the most advanced dome system in the industry featuring our patented Super-Lok connector system and Super-Wal double strut framework.
  • Wood paneled interiors.
  • Rejuvenating.
  • Surprising.
  • Humanly elegant.
  • Provocative.
  • Breath-taking.
  • Best housing value around.
  • Superior engineering for ventilation, condensation, wintertime warmth, summertime cooling, energy savings and air circulation.
  • The most resource efficient dome building system creating the most amount of space with the least amount of materials.

36' high profile - Colorado

You need to know the whole story and we can provide it to you. Order some of our informative books and the full length video by going to our online dome store, or you can call to talk about your dome plans 1-800-733-7107.

Whether you are curious or serious about domes,
you get our experienced personal attention.
That's the least you deserve.


Natural Spaces Domes

Contact Us

Natural Spaces Domes

37955 Bridge Rd., North Branch, Minnesota 55056 USA

Just 45 minutes north of the
Minneapolis/St. Paul metro area.

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Natural Spaces Domes

United States: 651-674-4292
International Phone: 01-651-674-4292
International Fax:
Twitter: https://twitter.com/nsdomes
Facebook: Click here
Skype: Naturalspacesdomes

Office Hours: 8:30 - 5:00 p.m. Monday - Friday
Weekends: Appointment Only
Winter Solstice Sale Bear Creek Dome