Percepciones del consumidor. Qué buscan los compradores en edificios sostenibles

The motivations of sustainable building buyers differ substantially from those assumed by the development sector, and this divergence explains a significant proportion of inefficiencies in commercial communication. The Consumer Attitudes to Sustainable Buildings survey by the WGBC (2023), conducted with 12,000 consumers across 14 countries, establishes a hierarchy of motivations in which economic savings on bills ranks first with 87% of mentions, followed by thermal comfort (74%), indoor air quality (61%), resale value (58%), and environmental commitment (43%). The ethical motivation, frequently assumed to be the top priority by marketing departments, actually occupies fifth place. In Spain, data from the CIS (March 2023 barometer, housing question) confirm this hierarchy: 82% of respondents cite "savings on electricity and gas" as the main advantage of an energy-efficient home, while only 29% spontaneously mention "reducing environmental impact."

Segmentation by age and income reveals significant nuances. Buyers aged 25-35 (late millennials) exhibit the highest sensitivity to sustainability (78% consider it a decisive factor) but also the lowest economic capacity to absorb premiums (average willingness to pay: 3.2% above the base price). The 36-50 segment combines moderate sensitivity (64%) with greater purchasing power (6.8% accepted premium), making it the optimal target for mid-to-upper-range sustainable properties. High-income buyers (above 60,000 EUR/year) accept premiums of 10-15% but demand top-tier certifications (LEED Platinum, Passivhaus, BREEAM Outstanding) and verified performance data (Savills, 2023). The study by Deloitte Real Estate (2023) of 4,500 European buyers adds that 52% of buy-to-let investors prioritise sustainability as a factor for long-term value protection rather than as a personal preference, requiring a sales narrative centred on market data and future regulation.

Barriers to purchasing sustainable buildings concentrate across three quantifiable dimensions: perceived overcost, distrust, and technical complexity. The perceived overcost is systematically higher than the actual one: Spanish buyers estimate an average overcost of 22% for a sustainable home compared to a conventional one (CIS, 2023), when the actual overcost ranges between 3% and 8% for BREEAM Very Good or LEED Gold levels (BRE, 2023). This overestimation of 14-19 percentage points constitutes the biggest marketing barrier: closing it through verifiable data would shift 34% of currently undecided buyers into the willing-to-purchase segment (WGBC, 2023). The perceived cost of renovation shows the same distortion: homeowners estimate an average cost of 45,000 EUR to retrofit a 90 m2 dwelling, when the actual cost of improving the energy rating by two letter grades stands between 13,500 and 25,200 EUR (IDAE, 2024).

Distrust of energy saving promises affects 62% of prospective buyers (Eurobarometer 535, 2023). Sources of distrust include: the gap between theoretical and actual performance (performance gap), the perception that certifications are "purchased labels" (47% of respondents), the lack of post-occupancy performance data (71% have never seen actual consumption data from certified buildings), and the absence of contractual performance guarantees (83% are unaware that energy performance contracts exist). To overcome these barriers, strategies such as energy performance guarantees (Energy Performance Contracts) applied to residential development reduce distrust by 45% (measured as an increase in willingness to purchase). The Dutch developer Heijmans has offered since 2022 a maximum energy consumption guarantee for 5 years on its nZEB homes, with financial compensation to the owner if actual consumption exceeds the projected figure by more than 10%: 89% of its buyers cite the guarantee as a positive factor in their decision (Heijmans Annual Report, 2023).

Willingness to pay (WTP) a sustainability premium varies significantly depending on the benefit communicated and the buyer profile. The meta-analysis by Chegut, Eichholtz, and Kok (2023), published in the Journal of Urban Economics and based on 47 studies covering 3.2 million transactions across 23 countries, establishes an average WTP of 7.6% for a high energy certification (A or B) in the residential segment and 12.3% in the commercial segment. WTP increases by 2.1 percentage points for every 1,000 EUR/year of documented energy savings, and by 1.8 pp for each additional third-party certification (LEED, BREEAM, Passivhaus, WELL). The elasticity of the premium relative to the base price is negative: for homes priced at 150,000 EUR, the average WTP reaches 10.2% (15,300 EUR); for homes priced at 400,000 EUR, it falls to 5.8% (23,200 EUR), indicating that the mid-to-lower market is proportionally more receptive to the green premium in percentage terms.

The presentation of price decisively influences perceived WTP. A controlled experiment by Brounen and Kok (2023) with 8,400 prospective buyers in the Netherlands demonstrated that presenting the green premium as an additional monthly mortgage cost (example: "+42 EUR/month for an A-rated home versus D") generates 34% higher acceptance than presenting the same amount as a total price increase ("+12,600 EUR"). When the estimated monthly energy saving is added (example: "+42 EUR/month in mortgage, but -78 EUR/month in energy = net saving of 36 EUR/month"), acceptance increases by an additional 67%. The total monthly cost of ownership technique (mortgage + energy + maintenance + insurance) demonstrates that an A-rated home priced 8% higher has a lower total monthly cost than a cheaper G-rated home over horizons exceeding 3-5 years, depending on mortgage rates. This price reframing eliminates the perception of overcost and transforms the green premium into a quantifiable net saving argument.

Consumer perceptions evolve in response to quantifiable external factors. The 2022-2023 energy crisis produced a 23 percentage point increase in the importance attributed to energy efficiency as a purchase factor (from 45% in 2021 to 68% in 2023 according to the Eurobarometer), and an 18% decrease in the average reflection time before purchasing energy-efficient homes (Idealista Data, 2024). The heatwaves of 2022 and 2023, with 61,000 deaths attributed to excessive heat in Europe (The Lancet Countdown, 2023), increased the valuation of thermal insulation and passive solar protection by 31%, especially in hot climate zones across southern Europe. Indoor air quality, virtually absent from the commercial discourse before 2020, has become the third-ranked decision factor following the COVID-19 pandemic: 61% of buyers consider it relevant in 2023, compared to 18% in 2019 (WGBC, 2023).

Emerging trends in consumer perceptions point to three vectors. First, real-time data transparency: 56% of buyers under 40 expect to access dashboards showing energy consumption and environmental quality of the building before purchase, and 78% would consider them a positive decision factor (JLL, 2024). Second, embodied carbon as a decision factor: although only 12% of current buyers mention it spontaneously, 38% consider it relevant when its meaning is explained (WGBC, 2023), indicating a latent market that will be activated by the regulation anticipated for 2030. Third, community and sense of belonging: 64% of buyers aged 25-45 value the existence of communal spaces, allotments, and energy communities, compared to 32% of those over 55 (CIS, 2023). Developers that monitor these perceptions through quarterly surveys of their lead base and adapt their communication accordingly achieve sales cycles 28% shorter and premiums 3.2 pp higher (Savills, 2023), demonstrating that active consumer listening is an investment with a direct return.