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A unique, windowless home composed of three connected concrete domes is currently for sale in Rio Rico, Arizona, for $73,000. Built as an earth-sheltered residence, the property maintains a consistent indoor temperature around 70 degrees Fahrenheit year-round without traditional heating or cooling systems. For buyers considering unconventional properties, this home highlights critical factors like specialized appraisals, renovation potential, and the long-term benefits of an energy-efficient design.
What is the design and layout of the Arizona circle house? The property, situated on 4 acres, features three interconnected circular structures made of concrete. This design is known as a domed or monolithic dome structure, which is renowned for its energy efficiency and structural strength. The main living area is a 1,256-square-foot circle containing two bedrooms and two bathrooms. It is flanked by a separate garage/workspace dome and a covered deck area. The home is not entirely subterranean but is built into a hillside, with its roof covered in soil—a construction method called earth-sheltering. This technique uses the ground's mass to naturally insulate the home. The most striking feature is the absence of windows in the living quarters, a deliberate choice by the original builder to create a consistent internal environment.
How does an earth-sheltered home maintain temperature? The temperature stability is a direct result of its earth-sheltered design. The thick concrete walls and soil-covered roof provide significant thermal mass. This mass absorbs heat during the day and releases it slowly at night, effectively buffering the interior from the extreme temperature swings common in the Arizona desert. Based on our experience assessment, this natural insulation is why the interior temperature remains in the 70s throughout the year without a central HVAC system. This can lead to substantial savings on energy bills, though it requires buyers to be comfortable with a reliance on natural ventilation and potential supplemental heating or cooling solutions for peak weather conditions.
What are the challenges of buying a unique property like this? The primary challenge is the appraisal process. Standard appraisals rely on comparing a property to recently sold, similar homes (comparables or "comps"). For a one-of-a-kind home, finding direct comparables is difficult. The listing agent noted that the appraiser had to look 60 miles away in Tucson to find a somewhat similar property. This can affect financing, as lenders may be hesitant to approve a mortgage without solid comparable sales data. Buyers should be prepared for a potentially complex purchase process and might need to explore alternative financing options or a larger down payment.
Is the property a good investment and what renovations are possible? The $73,000 price point reflects the home's unique nature and the specialized market it appeals to. Its value lies in its energy efficiency, durable concrete construction, and novelty. The covered deck area has existing utility connections, and the agent confirmed that a pool could still be added, enhancing the property's appeal. Potential buyers should factor in the cost of any desired updates and a thorough inspection by a specialist familiar with dome and earth-sheltered construction. While not a conventional investment, its low maintenance costs and unique character could attract a specific buyer segment when it's time to resell.
Purchasing a non-traditional home requires careful due diligence. Prospective buyers should prioritize a specialized home inspection to assess the condition of the concrete structure and waterproofing. Securing financing early is crucial, as not all lenders are familiar with these property types. Finally, consider the long-term practicality of a windowless design for daily living. This Arizona circle house is a testament to innovative, sustainable building and represents a unique opportunity for the right buyer willing to navigate its distinctive characteristics.
