Cited by 147Environmental Impact and SustainabilitySustainable Building Design and AssessmentBuilding energy efficiency and sustainability

A scenario analysis of the life cycle greenhouse gas emissions of a new residential area

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Säynäjoki, Antti, Heinonen, Jukka, Junnila, Seppo·2012·Environmental Research Letters

Abstract

While buildings are often credited as accounting for some 40% of the global greenhouse gas (GHG) emissions, the construction phase is typically assumed to account for only around one tenth of the overall emissions. However, the relative importance of construction phase emissions is quickly increasing as the energy efficiency of buildings increases. In addition, the significance of construction may actually be much higher when the temporal perspective of the emissions is taken into account. The construction phase carbon spike, i.e. high GHG emissions in a short time associated with the beginning of the building's life cycle, may be high enough to question whether new construction, no matter how energy efficient the buildings are, can contribute to reaching the greenhouse gas mitigation goals of the near future. Furthermore, the construction of energy efficient buildings causes more GHG emissions than the construction of conventional buildings. On the other hand, renovating the current building stock together with making energy efficiency improvements might lead to a smaller construction phase carbon spike and still to the same reduced energy consumption in the use phase as the new energy efficient buildings. The study uses a new residential development project in Northern Europe to assess the overall life cycle GHG emissions of a new residential area and to evaluate the influence of including the temporal allocation of the life cycle GHG emissions in the assessment. In the study, buildings with different energy efficiency levels are compared with a similar hypothetical area of buildings of the average existing building stock, as well as with a renovation of an area with average buildings from the 1960s. The GHG emissions are modeled with a hybrid life cycle assessment. The study suggests that the carbon payback time of constructing new residential areas is several decades long even when using very energy efficient buildings compared to utilizing the current building stock. Thus, while increasing the overall energy efficiency is important in the long term, the construction of new energy efficient buildings cannot be used as a means to achieve the short term and medium term climate change mitigation goals as cities and governments often suggest. Furthermore, given the magnitude of the carbon spike from construction and its implications, the climate change mitigation strategies should set reduction targets for the construction phase emissions alongside the ones for the use phase, which currently receives almost all of the attention from policy-makers.

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Crossref · 10.1088/1748-9326/7/3/034037

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  • In light of medium-term climate targets and the carbon spike produced with new construction, this research shows that building new runs counter to climate targets.

    “In light of medium-term climate targets and the carbon spike produced with new construction, this research shows that building new runs counter to climate targets (Säynäjoki et al. 2012).”

    From Making embodied carbon mainstream: a framework for cities to leverage waste, equity, and preservation policy to reduce embodied emissions in buildings (2023) · cites this paper as Säynäjoki et al. 2012

    The only passage returned from our copy is a list of URLs with no section or page label; it contains no substantive discussion of construction emissions or climate targets. Searches for “carbon spike,” “climate targets,” and construction-phase emissions found no passage that could establish whether the paper makes the attributed conclusion. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • A study of a new conventional residential development in Finland revealed that over the 50-year time horizon relevant to climate targets, the emissions from a comparable renovation were 35% lower.

    “A study of a new conventional residential development in Finland revealed that over the 50-year time horizon relevant to climate targets, the emissions from a comparable renovation were 35% lower.”

    From Making embodied carbon mainstream: a framework for cities to leverage waste, equity, and preservation policy to reduce embodied emissions in buildings (2023) · cites this paper as Säynäjoki et al. 2012

    The supplied passage contains only links, and the additional indexed passages contain links or garbled section headings, with no usable results or page labels. Searches for renovation, 35%, and a 50-year comparison found no passage establishing whether comparable renovation emissions were 35% lower. (LLM, conf=0.72)

    Experimental — accuracy not yet measured

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Authors
Säynäjoki, A., Heinonen, J., & Junnila, S.
Affiliations
Aalto University (FI)
Corresponding author
Säynäjoki, Antti
Venue
Environmental Research Letters
Published
2012-09-01
Volume
7
Issue
3
Pages
034037
ISSN
1748-9326 (ISSN-L)
OpenAlex
W2081513843
Cited by
147
References
33
Citations by year
2026: 7 · 2025: 9 · 2024: 8 · 2023: 12 · 2022: 11 · 2021: 11 · 2020: 15 · 2019: 10 · 2018: 13 · 2017: 10 · 2016: 12 · 2015: 14 · 2014: 6 · 2013: 9
FWCI
7.68
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • Environmental Research Letters (publishedVersion, cc-by-nc-sa)
  • Aaltodoc (Aalto University) (submittedVersion, cc-by-nc-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental Impact and Sustainability
  • Physical Sciences › Engineering › Building and Construction › Sustainable Building Design and Assessment
  • Physical Sciences › Engineering › Building and Construction › Building energy efficiency and sustainability
Keywords
construction phase emissions, life cycle greenhouse gas emissions, residential buildings, energy efficiency, carbon payback time, building renovation, climate change mitigation, hybrid life cycle assessment, scenario analysis

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