Browsing by Author "Katumba, Bamoni Nathalie"

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    Assessing the Retrofitting of Office Buildings in the City of Johannesburg, South Africa
    (University of the Witwatersrand, Johannesburg, 2023) Katumba, Bamoni Nathalie; Hildebrandt, Diane
    Climate change caused by greenhouse gasses (GHG) has become a challenge to the world and South Africa (SA) alike. SA emits 450 million tons per annum (TPA) of carbon dioxide (CO2) and is the 12th largest CO2 emitter in the world. Buildings account for 50% of GHG, globally; therefore, energy use in new and existing buildings must be addressed. Retrofitting existing buildings has been identified as one of the ways to achieve sustainability in the built environment, this is done by enhancing energy efficiency (EE), the environmental performance of the property and lowering energy demand. This study, therefore, examined the challenges, benefits and critical success factors (CSF) for retrofitting offices in the City of Johannesburg (CoJ), SA. The data for this study were obtained from built environment professionals with experience in retrofitting existing office buildings. An online questionnaire was issued to the targeted sample using Google Forms and 71 responses were received. The quantitative data were analysed using the t-test function from the Statistical Package for Social Sciences (SPSS) software. This study uncovered that lack of government incentives; budget constraints; longer payback periods; technical challenges and disruption of and inconvenience to the tenant during retrofitting are the top five challenges hindering retrofitting of existing office buildings. The study also identified improved EE; enhanced marketability of the buildings; improved building climate control; reduced energy consumption and reduced operational cost of buildings as the top five benefits of retrofitting existing office buildings. Furthermore, project cost control; communication; efficient planning and regulatory approvals between the municipality and project manager; project schedule management and competency of the project manager were revealed as the top five CSF that influence retrofitting of existing office buildings. Recommendations include engagements between various stakeholders; cost benefits analysis; CSF at the beginning of retrofitting projects; changes in government regulations and policies to incentivise retrofitting projects; tenants’ inputs throughout projects, public and private sectors collaboration; availability of retrofitting information and inclusion of sustainability in the built environment tertiary curriculum