Modular technology

The speed and comfort of installing

• It usually takes us only one day to install a new cellar, sauna, house or vault for other purposes.
• On-site, we install the modules in place and, if possible, connect the electrical wiring. Detailed videos of the process here.
• A separate foundation is not needed. The slab foundation is already integrated into the module. All that is required for installation is a simple gravel pad that is level. The corresponding instructions for this are included with the order.
• The only thing left to do after installation is the covering of the modules with soil and creating the desired look. You can also use the soil that was excavated when making the rubble pad for covering. We recommend finding a local company for the excavation works, because this way the cost will be cheaper and you will also support local producers.
• Installation is possible both in summer and winter, on both dry and slightly wetter soil. If you doubt the suitability – write to us. In the case of more complex projects, we can also come for a visit.
• We also make sure that the beautiful backyard does not suffer due to the installation. When transporting over the lawn, we use hard alloy mats that save landscaping.
• We offer turnkey solutions as well as the option where you can purchase only a concrete body and make the desired finish on it yourself.

Indoor climate and susability

• Vaulted ceilings ensure excellent air circulation.
• We finish the walls and ceilings with lime plaster, which has a sterilizing effect and prevents the formation of mold and fungi.
• The doors are made of solid wood, with swallowtail support beams. The hinges, handles, and latches are forged out of metal.
• The indoor climate and temperature can be regulated with air outlet and intake panels.
• Different windows can be installed on the building according to the wishes. In the case of residential buildings, the most popular options are floor-to-ceiling windows that bring a lot of space and light, as well as skylights.

Energy efficient and eco-friendly

• The modules are made of reinforced reinforced concrete with an expected lifespan of ~100 years.
• On buildings insulated with PUR foam and soil, we achieve near-zero energy efficiency.
• By covering with soil, there is no need to maintain the exterior walls, roof, foundation, insulation, and many other things in the future.
• The building has an underground, or geothermal, ventilation system, and to ensure constant temperature, humidity and air circulation, the building uses the passive energy of the ground.
  We use natural materials in the interior decoration.

Revonia Green+

We are somewhat more energy- and nature-efficient than conventional house and traditional modular house construction. This is precisely in areas such as:

• Transport – Instead of a concrete truck, builders’ cars, glass and door companies, electricians, interior work people, roofers and everyone else driving to the location of the desired new house – our installation truck comes only once and delivers the house modules in finished form, which require minimal on-site installation. We also order materials in large quantities and at one time. This means that one car brings windows for ~10 house projects, another car brings ~5 sauna heaters, etc. This significantly reduces CO2 emissions. In addition, large quantities also come with a more favorable price for the end customer.
• Energy use – Since an underground house uses ~30% less energy to heat than a normal house, both the homeowner and the environment benefit. In terms of energy use, it is also more economical to produce houses, cellars and saunas in one location and in a controlled environment, and then later transport and install them to the destination. Geothermal energy keeps the underground modules cool in summer and warmer in winter. In addition, the wind and storm raging outside do not particularly affect the indoor climate of the house. The concrete infrastructure of the house and sauna stores the heat in the room, and they remain warm even after heating. Revonia cellars also work completely without electricity. The energy savings of large-capacity cellars cannot even be compared to a refrigerator of the same capacity.
• Land use and impact on the surrounding environment – Most of our underground solutions are unnoticeable after installation. The most popular choice in this case is to make the windows and entrance on one side. This means that, viewed from three sides, it is just a grass bump. You can also plant grass and plants on the roof of the building or, for example, use it as a terrace, toboggan hill, solar park, as a parking lot and much more. Its impact on the surrounding environment is minimal. Installation does not require a lot of space and there is no need to get rid of the surrounding trees. Later, the house is so hidden in nature that you can often see wild animals in front of the house, who don’t realize that there could be a whole family’s residence under the same turf.
• Materials and construction resources – Concrete is not the most environmentally friendly material. PUR foam either. However, their footprint is reduced by the fact that a concrete module can be effectively used for ~100 years, that is, on average 2-3 times longer than an average wooden modular house. During this time, there is no need to change the roof, wall materials, foundation and many other things that depreciate in a normal house. The long service life and the non-existent need for maintenance make the concrete modular house a very low-resource solution for the future. In the production phase, labor and materials are optimally distributed, which means that the surplus of building materials remains minimal. The use of standard solutions also helps us to keep the cost price lower and ensures constant availability of stock.
• Interiors and innovative design – Lime plaster, which is an environmentally friendly and easily recyclable material, creates the climate in our interiors. In addition, the modules have natural ventilation or, if desired, forced ventilation. Innovatively, modern construction techniques are used, which ensure quality, and traditionally vaulted ceilings, which ensure durability. Proven solutions – in a new form.
• Waste management – When a normal wooden house depreciates, it is dismantled and either becomes heating material or finds its way into a landfill. In addition, when demolishing an ordinary house, there is a lot of waste such as insulation materials, metal and plastic parts and much more. They must be sorted and recycled. However, in the case of a concrete house, after being used as a living space, it can be used again by future generations as a cellar, sauna, garage or other storage space. Even in case of demolition, it is possible to separate the concrete modules from each other and reuse them if desired. From the recycling point of view, Revonia houses mainly consist of concrete, steel reinforcement, PUR foam, and then other choices – electrical wires, ventilation pipes, etc. Separation of materials from each other and subsequent sorting is also quite simple.
• Durability – As we mentioned before, the life of the shell of a concrete underground house can be expected to be ~100 years. After that, either in the cellar, sauna, storage room or something else. At this point, it is also worth thinking about what this house could be like in the future? It will most likely outlast the current owner and be used by future generations. Cellars built by grandparents are used in the same way as they are still today.

Revonia Green+

Compared to traditional house construction and also traditional modular house construction, we are somewhat more energy and environmentally friendly. This is especially true in areas such as:

• Transport – Instead of having concrete trucks, builders’ cars, glass and door companies, electricians, interior workers, roofers, and all others drive to the desired new house location, our installation vehicle only comes once and brings the finished house modules that require minimal installation on site. We also order materials in large quantities and at once. This means that one vehicle brings the windows for about 10 house projects, another vehicle about 5 sauna stoves, etc. This significantly reduces CO2 emissions. Additionally, ordering in large quantities results in a lower price for the end customer.
• Energy Usage – Since heating an underground house requires about 30% less energy than a traditional house, both the homeowner and the environment benefit. In terms of energy usage, it is also more economical to produce houses, cellars, and saunas in one location and in a controlled environment, and then transport and install them at the destination. Geothermal energy keeps the underground modules cool in summer and warmer in winter. Additionally, the indoor climate of the house is not significantly affected by outside storms and winds. The concrete infrastructure of the house and sauna stores the heat inside, keeping them warm for a long time after heating. Revonia cellars also work entirely without electricity. The energy savings of large cellars compared to equally sized refrigerators are incomparable.
• Land Use and Impact on Surrounding Environment – Most of our underground solutions are unnoticeable after installation. The most popular choice is to place windows and entrances on one side. This means that from three sides, the building appears to be just a mound of grass. The roof of the building can be planted with grass and plants or used as a terrace, sledding hill, solar energy park, parking space, and much more. The impact on the surrounding environment is minimal. Not much space is needed for installation and there is no need to remove surrounding trees. Later, the house is so well hidden in nature that you can often see wildlife in front of the house, not realizing that a large family home is hidden under the grass mound.
• Materials and Construction Resources – Concrete is not inherently the most environmentally friendly material. Neither is PUR foam. However, their footprint is reduced by the fact that a concrete module can be effectively used for about 100 years, averaging 2-3 times longer than an average wooden modular house. During this time, there is no need to replace the roof, wall materials, foundation, and much more that wears out in a traditional house. The long lifespan and minimal maintenance needs make the concrete modular house a quite resource-efficient solution for the future. In production, labor and materials are optimally distributed, meaning that material waste is minimal. Using standard solutions helps us keep costs down and ensures a constant stock availability.
• Interiors and Innovative Design – In the interiors, we create the climate with lime plaster, which is environmentally friendly and easily recyclable. Additionally, the modules have natural ventilation or, if desired, forced ventilation. Innovative modern construction techniques ensure quality and traditional vaulted ceilings ensure durability. Tried and tested solutions – in a new guise.
• Waste Management – When a traditional wooden house wears out, it is demolished and either used as fuel or ends up in a landfill. Additionally, demolishing a traditional house generates a lot of waste such as insulation materials, metal and plastic parts, and much more. These need to be sorted and recycled. With a concrete house, however, after being used as living space, it can be reused by future generations as a cellar, sauna, garage, or other storage space. Even in demolition, the concrete modules can be separated and reused if desired. In terms of reuse, Revonia houses mainly consist of concrete, steel reinforcement, PUR foam, and then other materials – electrical wires, ventilation pipes, etc. Separating and later sorting the materials is quite simple.
• Durability – As mentioned earlier, the expected lifespan of an underground concrete house is about 100 years. After that, it can still be used as a cellar, sauna, storage room, or something else. It is also worth considering what this house might look like in the future. It will most likely outlast the current owner and be used by future generations. Just as cellars built by grandparents are still in use today.