Smart readiness indicator evaluation and cost estimation of smart retrofitting scenarios - A comparative case-study in European residential buildings

The current research applies the SRI methodology in two typologies of typical residential buildings, Single- Family Houses and Multi-Family Houses, in five EU Countries, to evaluate the retrofitting cost towards buildings smartification and assess the SRI score when different retrofitting scenarios are applied. To that end, a threestep assessment process is adopted. First, the SRI is calculated for the baseline scenario representing the national minimum requirements according to the EPBD. Next, the SRI is calculated after applying a retrofitting scenario that includes market available technologies towards Nearly Zero Energy Buildings. Last, a more comprehensive retrofitting scenario of integrated technologies towards Positive Energy Buildings is assessed. Results indicate that buildings, constructed after the implementation of the EPBD, can increase smartness with a relatively low cost than older buildings, although their initial overall SRI score generally leads to an SRI Class G (0–20%), with buildings performing better in “Health, well-being and accessibility” and “Comfort” impact categories. Smartorientated retrofitting scenarios focusing on building automation and control measures can increase such buildings class up to “C” (65–80%), performing better in optimizing energy efficiency when applying retrofits towards NZEB. Applying retrofitting scenarios that could potentially lead to energy positiveness mainly supports building interaction with the grid.