Prioritizing deep renovation for housing portfolios
Journal article, 2019

Cost-effectiveness of deep renovation has been assessed thoroughly on a building level. Such studies pro- vide limited guidance when prioritizing renovation measures for a building portfolio. On a stock level, building-stock modelling is commonly used to assess impact of renovation on a national and city level, targeting stakeholders operating at a planning or policy level. However, due to methodological choices and data availability, assessment of property owner portfolios is lacking. The aim of this paper is to cal- culate and spatially differentiate cost-effectiveness of deep renovation using equivalent annual cost and increase in assessed building value for a portfolio owner as a first step in prioritizing deep renovation within a building portfolio. A bottom-up engineering-based model is applied utilizing building-specific information for a municipal housing company portfolio in the City of Gothenburg, Sweden, consisting of 1803 multi-family buildings. Energy demand for space heating and hot-water is calibrated using mea- sured energy use from energy performance certificates. Deep renovation is assessed by applying a pack- age of measures across all buildings. Results show average energy use reduction across the portfolio of 51% to an average cost of 597 EUR/m 2 living area. While average energy cost savings account for 21% of equivalent annual cost, there are seven buildings where more than half the annual equivalent cost of renovation is covered by energy cost savings. Similarly, the distribution of change in assessed build- ing value is large for individual buildings, ranging from 0–23%. Aggregating results to larger areas tend to average out results while differences between individual buildings within areas persists. As such, the cost-effectiveness of deep renovation should be assessed on a building-by-building basis rather than for an area or neighbourhood. The results are intended as a first step in prioritizing deep renovation within a building portfolio and further detailed assessment is needed.

Building-stock modelling

Cost-effectiveness

Energy efficiency

Portfolio assessment

Property valuation

Deep renovation

Author

Magnus Österbring

Chalmers, Architecture and Civil Engineering, Building Technology

Clara Camarasa

Chalmers, Architecture and Civil Engineering, Building Technology

Claudio Nägeli

Chalmers, Architecture and Civil Engineering, Building Technology

Liane Thuvander

Chalmers, Architecture and Civil Engineering, Architectural theory and methods, Research - Architectural Theory and Method

Holger Wallbaum

Chalmers, Architecture and Civil Engineering, Building Technology

Energy and Buildings

0378-7788 (ISSN)

Vol. 202 109361

Developing sustainable trajectories for urban building-stocks

Swedish Energy Agency, 2014-07-01 -- 2017-12-31.

Driving Forces

Sustainable development

Areas of Advance

Building Futures (2010-2018)

Energy

Subject Categories

Civil Engineering

DOI

10.1016/j.enbuild.2019.109361

More information

Latest update

8/26/2019