Cost benefit analysis of construction and demolition waste diversion from landfill. A case study based on HLC Ltd development in Auckland

Author:
Mehrnaz Rohani, Ting Huang, Leon Hoffman, Barbara Ribeiro, Mark Roberts
Source:
Auckland Council Research and Evaluation Unit, RIMU
Publication date:
2019

Sending construction and demolition (C&D) waste to landfill creates environmental problems for Auckland. Data on Auckland’s waste volumes indicate that C&D waste (e.g. rubble, concrete, timber, plasterboard, insulation materials) together account for 40 per cent of all waste sent to landfills.

Auckland Council has a vision of “Zero waste by 2040”. To achieve this, the council has set a long-term target in its Waste Management and Minimisation Plan (WMMP) of reducing total waste to landfill by 30 per cent by 2027. As Auckland’s single largest waste stream, with high tonnages going to landfill and high diversion potential, C&D waste has been identified by the council as a priority waste stream to achieve the WMMP’s target.

As C&D waste is a source of commercial waste, the council has limited influence over the construction industry’s behaviour of managing it. However, there is an opportunity to work with large-scale developers to support C&D waste diversion through wider uptake of deconstruction methods instead of demolition, and facilitating the recycle and reuse of materials.

This is a report on a high-level Cost Benefit Analysis (CBA) of two options proposed by Auckland Council’s Waste Solutions Unit for C&D waste diversion from landfill. For each proposed option, expenditure is spread across a series of activities that relate to each of the broad areas of focus identified for C&D waste diversion, namely awareness, infrastructure, brokerage, regulatory controls, training, job and business opportunities.

Auckland Council technical report TR2019/009

Last updated: 2019-07-31

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