My boyfriend and I have been considering buying a home lately. We’ve looked into older homes, brand new homes by established builders, custom-built homes, and Earth Sheltered Homes. The more I looked into each of these options, the better the Earth Sheltered Home option seem to be the best.
I originally learned about the idea of Earth Sheltered Technology from the Gestalt forum, but I initially found that the information available for this technology was somewhat sporadic … some of it is available on the contractors’ websites, a bit of it from architects, some of it from general information sites. So in order to make the search easier for some out there, here’s what I’ve been able to find out:
Earth Sheltered Homes basically come in three types. I’m not sure what the technical names for these three types are, but they are as follows:
1. The home sits above the ground on all four walls and the bottom few feet of the home is built into the earth.
2. The home is surrounded on 3 walls by earth, generally built into a hillside, and the roof is generally covered by earth as well.
3. The home is surrounded and covered by earth, and is somewhat settled into the earth, so that there is very little direct light coming into the home.
If we decide to build one, we would build Type 2, which also appears to be the most common variety based on my research. An Earth Sheltered Home is very good for the environment compared to conventional homes. The home gets much of its heating and cooling from the surrounding earth, causing the internal temperature to remain much more stable than in a conventional home. The soil itself is not additional insulation, but rather just does not fluctuate in temperature as much as the air around a conventional home. Additionally, the Earth Sheltered Home in options 2 and 3, has less impact on the surrounding earth than a conventional home, since the plants and soil can grow on top of the home as well.
These homes are great for those with allergies as well (of which both my boyfriend and myself suffer). The homes, when well-constructed, are sealed and there is generally a single source of air into the house. A filter can be placed on this source and the air can be turned off and on as needed.
The general architecture of the home varies from builder to builder and design to design. However, most of them generally have one wall of mostly windows which faces South in order to get the best passive solar heating. Many designs have thick concrete walls (which can actually look quite pretty when designed well), but some builders use dome technology instead, which does not require the thick concrete in order to withstand the weight of the earth. It seems that the front of the home can look as unique or as conventional as you wish. Some of the builders use plans that they’ve already designed and some recommend having custom plans designed to tailor to your specific house requirements. One of the nice things about the dome technology is that the house does not need supporting walls, so it can lead to some very unique designs.
One of the great things about these homes is that they are not only good for the environment, but they are also protected from it. Simply being surrounded by earth and blending into the hillside helps considerably for this, but there are several builders who use dome construction as well (as mentioned above) and the dome is considerably stronger than a conventional home. According to the builders, these homes can withstand earthquakes, hurricanes, tornadoes, and even a nuclear blast.
There is a myth that earth sheltered homes are dark and dreary inside. Based on the pictures I’ve seen, nothing can be further from the truth. I don’t really want to link directly to a builder website to show you pictures, but many different builders, designers, and architects can be found here: http://www.malcolmwells.com/resources.html. On their webpages are some gorgeous pictures of both the inside and outside of these homes. If/When we build one, I’ll be happy to post pictures here to give everyone an idea.
There are homes, sometimes referred to as Earth Ships, which can be used in such a way that everything required for living is available within the home. The homes are often made out of recycled material and contain gardens, water sources, and waste disposal systems within the home. I have not done as much research on these, but if this is something you are interested in, more information can be found here: http://www.earthship.org/.
As far as Earth Sheltered Pricing goes, it does not seem to be that high considering the savings. It can cost 10-20% more to build an Earth Sheltered Homes than a traditional home, but depending on the builder you go with and the location, the cost can be the same as a conventional home or even less. The overall savings, however, are tremendous. Most people report a 75% reduction in energy costs, sometimes more. With today’s gas prices, you don’t need me to tell you how much that can add up to over a 30-year mortgage. You may also be able to check with your energy company or your local government to determine if there are any additional savings or benefits you can receive by building an environmentally-conscious home.
Some of these contractors or builders do not always function in that role - they offer kits that you can use to build the house yourself or to have your own contractors do it. Many of them do offer contractor services themselves, though, if you’d like to go through them. The one thing to be careful of is to make sure someone with experience is at least over- seeing the process since there are some construction matters that need to be considered specifically for these homes, such as sealing against moisture and airflow.
If you were to build an Earth Sheltered Home, you’ll want to be conscientious in your land selection. Different types of soil work better or worse for an Earth Sheltered Home, and you’ll always want to consider the position of the water table in relation to the home site. This website has information regarding some of the factors to consider when choosing a site: http://www.daviddarling.info/encyclopedia/E/AE_earth-shelter ed_house.html (Scroll down to “Site-Specific factors for earth-sheltered home design”). If you get an experienced Realtor who can sell you the site, they may be able to help you determine these factors.
One of the considerations for us is financing. I’m not at a stage in my life where I can buy a custom home with cash, so I need to be able to finance it. There are, in fact, many construction loans that a good mortgage broker can point you in the direction of. Also, these homes are generally eligible for most if not all traditional funding since they are considered very safe and cost-effective for the owner, and generally have good re-sale value.
The most important thing I can say about these is to really have a good site, a good design, and a good contractor to at least oversee it. But, in the end, these homes can be unique, extremely safe, nearly maintenance-free, beautiful, and amazingly cost effective - all while being environmentally friendly.