This paper outlines an integrated energy-efficient retrofitting framework for Shyamvadi, a 10,000 sq. ft. commercial party hall in Junagadh, Gujarat, targeting IGBC Existing Building certification. The retrofit scope included the deployment of a 34.8 kW rooftop solar PV system, LED lighting upgrades, BEE 5-star-rated inverter HVAC units, envelope insulation using reflective coatings and PUF panels, and IoT-based energy monitoring. Baseline and post-retrofit performance data were analysed to quantify energy savings, financial returns, and environmental impact. Results indicate a 56.56% reduction in annual energy demand, with a net annual saving of ₹6.78 lakh and a payback period of 3.59 years. The intervention yields lifetime savings of ₹1.69 crore and offsets 76,361 kg CO₂/year, equivalent to the annual absorption of 3,636 trees. This study demonstrates the technical and economic feasibility of retrofitting legacy commercial buildings to meet IGBC benchmarks, offering a replicable model for sustainable urban infrastructure in India.

Key Words – Energy Efficiency, IGBC Certification, Retrofitting, Commercial Building, Solar PV

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1.  S. Singh, R. B. Lal, U. Sridharan, and V. P. Upadhyay, “Environmental Sustainability Guidelines for Green Buildings in India: a Review,” Indian J Sci Res Technol, vol. 4, no. 1, pp. 2321–9262, 2016, [Online]. Available: www.indjsrt.com
2. Obinna Iwuanyanwu, Ifechukwu Gil-Ozoudeh, Azubuike Chukwudi Okwandu, and Chidiebere Somadina Ike, “Retrofitting existing buildings for sustainability: Challenges and innovations,” Eng Sci 13Technol J, vol. 5, no. 8, pp. 2616–2631, 2024, doi: 10.51594/estj.v5i8.1515.
3.  F.S. Hafez, B. Sa’di, M. Safa-Gamal, Y.H. Taufiq-Yap, M. Alrifaey, M. Seyedmahmoudian, A. Stojcevski, B. Horan, S. Mekhilef, Energy efficiency in sustainable buildings: a systematic review with taxonomy, challenges, motivations, methodological aspects, recommendations, and pathways for future research, Energy Strategy Rev. 45 (2023), 101013.
4.  A. A. Kim and L. Medal, “Factors Influencing Energy-Efficiency Retrofits in Commercial and Institutional Buildings: A Systematic Literature Review,” J Facil Manag Educ Res, vol. 7, no. 1, pp. 42–63, 2024, doi: 10.22361/jfmer/181200.
5. A. Ashish, “Green Building Retrofit for an Existing Commercial Building at Nehru Place, New Delhi,” Int J Res, vol. 1, no. 5, pp. 904–911, 2014.
6. S. Wan, G. Ding, G. Runeson, and Y. Liu, “Sustainable Buildings’ Energy-Efficient Retrofitting: A Study of Large Office Buildings in Beijing,” Sustain, vol. 14, no. 2, pp. 1–24, 2022, doi: 10.3390/su14021021.
7. R. Joshi, M. Pathak, and A. K. Singh, “Designing Self-Energy Sufficient Buildings in India,” Energy Procedia, vol. 57, pp. 3110–3119, 2014, doi: 10.1016/j.egypro.2015.06.062.
8. P. H. S. Mehta and V. Porwal, “Green Building Construction for Sustainable Future,” vol. 3, no. 6, pp. 7–14, 2013.
9. Y. V. Pavan Kumar and R. Bhimasingu, “Renewable energy based microgrid system sizing and energy management for green buildings,” J Mod Power Syst Clean Energy, vol. 3, no. 1, pp. 1–13, 2015, doi: 10.1007/s40565-015-0101-7.
10. R. Sharma, S. Goel, S. R. Lenka, and P. R. Satpathy, “Energy efficiency retrofitting measures of an institutional building: A case study in eastern India,” Clean Energy Syst, vol. 7, no. February, p. 100111, 2024, doi: 10.1016/j.cles.2024.100111.
11. R. Dalal, K. Bansal, and S. Thapar, “Bridging the energy gap of India’s residential buildings by using rooftop solar PV systems for higher energy stars,” Clean Energy, vol. 5, no. 3, pp. 423–432, 2021, doi:10.1093/ce/zkab017.
12. V. Gupta and C. Deb, “Energy Retrofit analysis for an educational building in Mumbai,” Sustain Futur, vol. 4, no. September, p. 100096, 2022, doi: 10.1016/j.sftr.2022.100096.
13. A. Sana Noor, F. Zohra, S. Perween, and T. Fatima, “A CASE STUDY of BIPV APPLICATION TOWARDS GREEN BUILDING,” IOP Conf Ser Mater Sci Eng, vol. 691, no. 1, 2019, doi: 10.1088/1757-899X/691/1/012046.
14. M. Azouz and S. Elariane, “Towards energy efficiency: retrofitting existing office buildings using smart technologies,” J Eng Appl Sci, vol. 70, no. 1, pp. 1–17, 2023, doi: 10.1186/s44147-023-00327-0.
15. M. Mukhtar et al., “Building retrofit and energy conservation/efficiency review: A techno-environ- economic assessment of heat pump system retrofit in housing stock,” Sustain, vol. 13, no. 2, pp. 1–23, 2021, doi: 10.3390/su13020983.

This paper outlines an integrated energy-efficient retrofitting framework for Shyamvadi, a 10,000 sq. ft. commercial party hall in Junagadh, Gujarat, targeting IGBC Existing Building certification. The retrofit scope included the deployment of a 34.8 kW rooftop solar PV system, LED lighting upgrades, BEE 5-star-rated inverter HVAC units, envelope insulation using reflective coatings and PUF panels, and IoT-based energy monitoring. Baseline and post-retrofit performance data were analysed to quantify energy savings, financial returns, and environmental impact. Results indicate a 56.56% reduction in annual energy demand, with a net annual saving of ₹6.78 lakh and a payback period of 3.59 years. The intervention yields lifetime savings of ₹1.69 crore and offsets 76,361 kg CO₂/year, equivalent to the annual absorption of 3,636 trees. This study demonstrates the technical and economic feasibility of retrofitting legacy commercial buildings to meet IGBC benchmarks, offering a replicable model for sustainable urban infrastructure in India.

Key Words – Energy Efficiency, IGBC Certification, Retrofitting, Commercial Building, Solar PV

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.

1.  S. Singh, R. B. Lal, U. Sridharan, and V. P. Upadhyay, “Environmental Sustainability Guidelines for Green Buildings in India: a Review,” Indian J Sci Res Technol, vol. 4, no. 1, pp. 2321–9262, 2016, [Online]. Available: www.indjsrt.com
2. Obinna Iwuanyanwu, Ifechukwu Gil-Ozoudeh, Azubuike Chukwudi Okwandu, and Chidiebere Somadina Ike, “Retrofitting existing buildings for sustainability: Challenges and innovations,” Eng Sci 13Technol J, vol. 5, no. 8, pp. 2616–2631, 2024, doi: 10.51594/estj.v5i8.1515.
3.  F.S. Hafez, B. Sa’di, M. Safa-Gamal, Y.H. Taufiq-Yap, M. Alrifaey, M. Seyedmahmoudian, A. Stojcevski, B. Horan, S. Mekhilef, Energy efficiency in sustainable buildings: a systematic review with taxonomy, challenges, motivations, methodological aspects, recommendations, and pathways for future research, Energy Strategy Rev. 45 (2023), 101013.
4.  A. A. Kim and L. Medal, “Factors Influencing Energy-Efficiency Retrofits in Commercial and Institutional Buildings: A Systematic Literature Review,” J Facil Manag Educ Res, vol. 7, no. 1, pp. 42–63, 2024, doi: 10.22361/jfmer/181200.
5. A. Ashish, “Green Building Retrofit for an Existing Commercial Building at Nehru Place, New Delhi,” Int J Res, vol. 1, no. 5, pp. 904–911, 2014.
6. S. Wan, G. Ding, G. Runeson, and Y. Liu, “Sustainable Buildings’ Energy-Efficient Retrofitting: A Study of Large Office Buildings in Beijing,” Sustain, vol. 14, no. 2, pp. 1–24, 2022, doi: 10.3390/su14021021.
7. R. Joshi, M. Pathak, and A. K. Singh, “Designing Self-Energy Sufficient Buildings in India,” Energy Procedia, vol. 57, pp. 3110–3119, 2014, doi: 10.1016/j.egypro.2015.06.062.
8. P. H. S. Mehta and V. Porwal, “Green Building Construction for Sustainable Future,” vol. 3, no. 6, pp. 7–14, 2013.
9. Y. V. Pavan Kumar and R. Bhimasingu, “Renewable energy based microgrid system sizing and energy management for green buildings,” J Mod Power Syst Clean Energy, vol. 3, no. 1, pp. 1–13, 2015, doi: 10.1007/s40565-015-0101-7.
10. R. Sharma, S. Goel, S. R. Lenka, and P. R. Satpathy, “Energy efficiency retrofitting measures of an institutional building: A case study in eastern India,” Clean Energy Syst, vol. 7, no. February, p. 100111, 2024, doi: 10.1016/j.cles.2024.100111.
11. R. Dalal, K. Bansal, and S. Thapar, “Bridging the energy gap of India’s residential buildings by using rooftop solar PV systems for higher energy stars,” Clean Energy, vol. 5, no. 3, pp. 423–432, 2021, doi:10.1093/ce/zkab017.
12. V. Gupta and C. Deb, “Energy Retrofit analysis for an educational building in Mumbai,” Sustain Futur, vol. 4, no. September, p. 100096, 2022, doi: 10.1016/j.sftr.2022.100096.
13. A. Sana Noor, F. Zohra, S. Perween, and T. Fatima, “A CASE STUDY of BIPV APPLICATION TOWARDS GREEN BUILDING,” IOP Conf Ser Mater Sci Eng, vol. 691, no. 1, 2019, doi: 10.1088/1757-899X/691/1/012046.
14. M. Azouz and S. Elariane, “Towards energy efficiency: retrofitting existing office buildings using smart technologies,” J Eng Appl Sci, vol. 70, no. 1, pp. 1–17, 2023, doi: 10.1186/s44147-023-00327-0.
15. M. Mukhtar et al., “Building retrofit and energy conservation/efficiency review: A techno-environ- economic assessment of heat pump system retrofit in housing stock,” Sustain, vol. 13, no. 2, pp. 1–23, 2021, doi: 10.3390/su13020983.