The Nest Hackathon is organized in collaboration with Helsinki Think Company and the experts in the field from the Decarbon-Home research project.

Nest Hackathon is a multidisciplinary weekend challenge that brings together students and professionals from various study backgrounds to develop innovative solutions for sustainable housing. The participants will develop a pilot that helps to renovate over a million homes in Finland and help tackle one of the biggest emitters in Finland.

The hackathon will have an unique atmosphere, where teams can focus on developing a pilot product for the theme of the challenge. Helsinki Think Company will create an atmosphere that encourages innovation and is familiar to hackathon veterans everywhere.

Who can take part?

Good news, the hackathon is open for everyone! No matter if you are a student, in the early stages of your career or further along, this is the perfect opportunity to challenge yourself and learn from the experts in the field. All that is required is that the person brings their talent to the table and wants to be part of a team that innovates in an efficient manner.

It is possible to apply to Nest Hackathon individually or as a team. The teams can be either set or formed by the organizers.

The ability to understand Finnish is required within the team, as some of the material is in Finnish only. Not everyone within the team has to be Finnish-speaking, though.

The theme of the challenge – how to make energy renovation as easy as possible for homeowners?

Climate change and the energy crisis have encouraged more and more Finns to consider and implement energy renovations in their homes. In particular, there are many opportunities for energy efficiency measures in rural areas, where renovations are currently needed.

Therefore, there is a need for tools and solutions to tackle this issue. During Nest Hackathon, the participants will work in interdisciplinary teams to create gamified solutions through an app to incentivize sustainable behaviors and provide homeowners with information and resources to make their homes more environmentally smart.

The wider scope: knowledge to action!

The Nest Hackathon is organized as a collaboration between Helsinki Think Company and the multidisciplinary Decarbon-Home research project. The project’s mission is to promote a fair and socially just sustainability revolution in housing and construction. Decarbon-Home works together with cities, residents and other stakeholders to reach concrete solutions in order to reach the goal.

Nest Hackathon occurs over a weekend with the experienced facilitation by Helsinki Think Company. However, the challenge does not stop there! For the best ideas, there is excitingly a possibility for further funding within the project.

How to apply?

Nest Hackathon will take place on the weekend of 15th to 17th September. Application period to Nest Hackathon lasts until August 31st. But why wait until then? We will make the first selections already by June 9th, so that you can spend the summer relaxing!

Apply to make a difference and grow as an expert in a unique atmosphere! Read more and apply at

Julkaisun nimiImpact of prospective residents’ dwelling requirements on preferences for house construction materials
KirjoittajatAnders Roos, Hans-Fredrik Hoen, Francisco X. Aguilar, Antti Haapala, Elias Hurmekoski, Jaakko Jussila, Katja Lähtinen, Cecilia Mark-Herbert, Tomas Nord, Ritva Toivonen, Anne Toppinen
JulkaisijaWood Material Science & Engineering


This study investigated people’s requirements for multi-story housing attributes and preferences for apartments in wooden-structure versus steel/concrete-structure multi-story buildings. Data came from an online survey conducted in Finland and Sweden that screened for respondents who expressed a preference for living in an apartment, as compared with a low-rise dwelling. Responses were analyzed using exploratory factor and regression analyses. Swedish respondents assigned significantly higher requirements to factors related to environmental and social sustainability performance than Finnish respondents. Requirements in both countries were described across three factors: environmental and social sustainability, quality, and design. Factor scores differed between socioeconomic sub-groups, particularly regarding quality, between urban and non-urban respondents. Preferences to live in an apartment in a wooden building were positively associated with respondents’ requirements for environmental and social sustainability, and negatively with requirements for quality-related attributes. Opposite relationships were found in the Swedish sample for apartments in non-wooden structure houses. Design requirements had no significant association with preferences for a specific material in load-bearing structures for multi-story buildings, in either country. The findings can contribute toward enhanced marketing efforts and customized value propositions to increase the social acceptability of multi-story wooden buildings and advance climate-related goals within the housing sector.

Julkaisun nimiCo-developing sustainability – a consumer-inclusive approach to wooden housing business in Finland
KirjoittajatEliisa Kylkilahti, Minna Autio, Viktor Harvio, Ulrika Holmberg, Anne Toppinen
JulkaisijaHousing Studies


The housing construction industry can address sustainability issues by developing its business practices. This requires a shift from a firm-driven business logic to a consumer-inclusive approach where consumers and businesses together enhance sustainable development. By analyzing data from focus group discussions with both industry experts in the wooden multi-storey construction business and consumers residing in novel wooden buildings, this study examines how businesses can engage consumers in the development of sustainable housing. The results are presented as an iterative dialogue process that acknowledges consumers as important actors to whom innovative housing solutions should be appropriately introduced and whose lived experiences need to be understood. The findings indicate that consumer experiences can feed the creation and uptake of innovations that enhance sustainability in the construction sector. The study fosters the material aspect of sustainable housing and, by highlighting consumer participation and communication, proposes tools for its consumer-inclusive co-development.

Julkaisun nimiCitizen beliefs concerning wood as a construction material under extreme weather events.
KirjoittajatVehola, A., Hurmekoski, E., Lähtinen, K., Ruokamo, E., Roos, A., Toivonen, R. & Toppinen, A.
JulkaisijaCanadian Journal of Forest Research


Climate change places great pressure on the construction sector to decrease its greenhouse gas emissions and to create solutions that perform well in changing weather conditions. Our study explores citizen perceptions on wood usage as a building material under expected mitigation and adaptation measures aimed at a changing climate and extreme weather events. The data are founded on an internet-based survey material collected from a consumer panel from Finland and Sweden during May–June 2021, with a total of 2015 responses. By employing exploratory factor analysis, we identified similar belief structures for the two countries, consisting of both positive and negative views on wood construction. In linear regression models for predicting these beliefs, the perceived seriousness of climate change was found to increase positive views on wood construction but was insignificant for negative views. Both in Finland and Sweden, higher familiarity with wooden multistory construction was found to connect with more positive views on the potential of wood in building, e.g., due to carbon storage and material properties. Our findings underline the potential of wood material use as one avenue of climate change adaptation in the built environment. Future research should study how citizens’ concerns for extreme weather events affect their future material preferences in their everyday living environments, also beyond the Nordic region.

Julkaisun nimiWooden multi-storey construction market development – systematic literature review within a global scope with insights on the Nordic region
KirjoittajatJaakko Jussila, Emil Nagy, Katja Lähtinen, Elias Hurmekoski, Liina Häyrinen, Cecilia Mark-Herbert, Anders Roos, Ritva Toivonen, Anne Toppinen
JulkaisijaSilva Fennica


Puun käyttö kerrostalorakentamisessa on noussut mielenkiintoiseksi vaihtoehdoksi kaupunkiympäristössä, sillä puu toimii rakennuksissa pitkäaikaisena hiilivarastona. Tutkimuskatsauksemme keskittyi kokoamaan yhteen puukerrostalorakentamisen markkinoiden kasvun keskeisiä esteitä ja mahdollistavia tekijöitä, tunnistamaan alan keskeisiä toimijoita sekä käytettyjä tutkimusmenetelmiä. Synteesi muodostui vuosien 2000–2020 aikana ilmestyneistä vajaasta 700 artikkelista Web of Science ja Scopus-tietokannoissa, joista 42 artikkelia valikoitui lopulliseen sisältöanalyysiin. Tulosten mukaan puukerrostalorakentamisen yleistymistä tukee erityisesti teollisen esivalmistuksen mahdollistama kustannustehokkuus sekä erityisesti kuluttajien ja arkkitehtien näkemykset puumateriaalien eduista kestävän kehityksen näkökulmasta. Olemassa olevaa tutkimusta hallitsevat tapaustutkimukset, laadullisten aineistojen käyttö ja maantieteellinen keskittyminen Pohjoismaihin.


Climate change sets high pressures on the construction industry to decrease greenhouse gas emissions. Due to the carbon storage properties and potential to use renewable resources efficiently, wooden multi-storey construction (WMC) is an interesting alternative for the construction industry to enhance sustainable development combined with the aesthetic and well-being benefits of wood perceived among many consumers. For forest industry firms, industrial wood construction is a possibility to seek for business opportunities and bring socio-economic benefits for local economies. Despite positive drivers, WMC still remains a niche even in the forest-rich countries.The purpose of our study is to add understanding on the WMC market development by conducting a systematic literature analysis on international peer-reviewed studies from the past 20 years. Our special focus is on the role of WMC in the housing markets studied from the perspectives of the demand, supply and local governance factors. As specific aims, we 1) synthesize the key barriers and enabling factors for the WMC market growth; 2) identify the actors addressed in the existing studies connected to the WMC market development, and 3) summarize research methods and analytical approaches used in the previous studies. As a systematic method to make literature searches in Web of Science and Scopus for years 2000–2020, we employed PRISMA guidelines. By using pre-determined keywords, our searches resulted in a sample of 696 articles, of which 42 full articles were after selection procedure included in-depth content analysis. Our results showed cost-efficiency gains from industrialized prefabrication and perceived sustainability benefits by consumers and architects enabled a WMC market diffusion. The lack of experiences on the WMC, and path dependencies to use concrete and steel continue to be key barriers for increased WMC. Although our research scope was the global WMC market development, most of the literature concerned the Nordic region. The key actors covered in the literature were businesses (e.g., contractors, manufacturers and architects) involved in the wood construction value-chains, while residents and actors in the local governance were seldomly addressed. Currently, case studies, the use of qualitative data sets and focus on the Nordic region dominate the literature. This hinders the generalizability of findings in different regional contexts. In the future, more research is needed on how sustainability-driven wood construction value-chains are successfully shaping up in different geographical regions, and how they could challenge the dominant concrete-based construction regime.

Julkaisun nimiBringing ecosystem thinking to sustainability-driven wooden construction business
KirjoittajatNoora Vihalainen, Eliisa Kylkilahti, Minna Autio, Juho Pöyhönen, Anne Toppinen
JulkaisijaJournal of Cleaner Production


Rakentamisen materiaalivalinnoilla on merkittäviä ympäristövaikutuksia. Puukerrostalojen lisäämistä on ehdotettu yhdeksi keinoksi edistää kestävyysmuutosta kaupungeissa. Rakennusalalla on kuitenkin vahva polkuriippuvuus vakiintuneiden rakennusmateriaalien ja -menetelmien sekä kumppanuuksien käyttämiseksi. Tässä tutkimuksessa pyrimme ymmärtämään verkostoperustaista yhteistyötä ja oppimista sekä loppukäyttäjien osallistumista uudenlaisen puurakentamisliiketoiminnan kontekstissa. Tutkimuksessa hyödynnetään laadullisia menetelmiä ja aineistoa analysoidaan liiketoimintaekosysteemi-lähestymistavan kautta. Tutkimuksessa kävi ilmi, että yhteistyön esteitä puukerrostaloliiketoiminnan ekosysteemien kehittämiselle ovat sekä toimijoiden välisten yhteisten tavoitteiden selkeyden puute että loppukäyttäjien heikko osallistaminen. Yritykset ja loppukäyttäjät eivät myöskään täysin tunnista puukerrostalon kestävyyteen liittyviä näkökohtia. Yhteistyötä ja oppimista mahdollistaviksi tekijöiksi tunnistettiin muun muassa sujuva viestintä ja luottamuksen rakentaminen liike-elämän toimijoiden kesken erityisesti suunnittelu- ja rakentamisvaiheiden aikana. Tutkimustulokset viittaavat siihen, että laajemman liiketoimintaekosysteemi-lähestymistavan omaksuminen, eli myös asumisen ja rakennuksen käyttövaiheiden huomioiminen, tuottaisi toimialalle ajattelutavan muutoksen. Tällöin kestävyyteen perustuvaa logiikkaa voitaisiin kehittää kannattavan rakennusliiketoiminnan rinnalla, luoden arvoa kuluttajille.


Lowering environmental impacts by material choices is proposed as a way to promote urban sustainability transition, and one solution is building more wooden multi-storey constructions (WMCs). In the construction industry, however, there is a strong path dependency towards applying well-established construction materials and methods, as well as partnerships. To gain understanding of network-based collaboration, learning and end-user involvement in novel wooden construction business, the study uses qualitative methods and employs business ecosystem approach in the analysis. The studied WMC business case revealed that barriers of collaborative business ecosystem development include both the lack of clarity in the shared goals between actors and weak end-user involvement. Moreover, neither companies nor end-users fully recognize sustainability aspects around WMC. Enabling factors such as smooth communication and building trust among business actors during planning and building were recognised. The study suggests that a broader business ecosystem approach, including the living and use of the building, offers a mindset shift for developing sustainability-driven logic alongside profitable construction business and creating value for consumers.