Residential issues and higher property prices in urban environments, especially in Ljubljana, prompt consideration of land utilization and an increased need for efficient energy use. Consequently, there is often an encouragement to maximize parcel utilization and examine the challenges of efficient energy use, particularly in relation to a thicker external wall thermal insulation. The research aims to determine the optimal point of investment in additional insulation concerning energy savings and potential profit loss due to reduced gross internal building area. In the study, we considered three different types of buildings (single-family house, residential villa, multi-apartment building) and prepared three examples of construction assemblies for each structural material (wooden filigree construction, wooden planar construction, brick and reinforced concrete). For each construction assembly, we prepared three examples based on the thickness of external thermal insulation, and in the final step, calculated heat losses. Using the generalized value model for houses, we assessed the value of a single-family property. For the residential villa and multi-apartment building, we sought only the point at which the added insulation becomes cost-effective per square meter of real estate, obtaining conclusive results that demonstrate that additional thermal insulation in the Ljubljana area isn't cost-effective due to high per-square-meter property prices. Our research has unveiled that the matter of additional building thermal insulation is intricate and multilevel, encompassing dynamic real estate prices, future energy cost increases, technological advancements, and the specific characteristics of buildings and their surroundings.
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