Nigeria's housing problems have persisted regardless of changes in policy, strategies, actions and instruments. This study examines housing policy changes and factors that influence housing supply outcomes at the local level. The study, first of all, reviews the state of housing provision in the national context. The focus is then turned to the city of Jos in north-central Nigeria, where institutional arrangements for the provision of housing are critically examined. Primary data was obtained through interviews with industry role players (government officers and house builders) and the views of people were sampled through a questionnaire survey. This data was then combined with secondary source material to examine financial mechanisms, subsidy provision and local-level organisational frameworks for partnership. The findings suggest that a shift from a state-led to an enabling approach for housing did stimulate the activities of private house-builders and primary mortgage institutions. However, their activities are not spread across the regions of Nigeria. The issue of equitable allocation of public housing across the regions of Nigeria by the federal agencies has not been addressed by the enabling policy framework. Further, the idea of decentralisation of housing provision was introduced but did not result in the formulation of strategies by the local authorities in Jos. The national housing policy itself appears to be ambiguous and difficult to implement by the authorities in Jos. The ambiguities arose because there is a lack of policy enforcement mechanism, political commitment, and a poor local organisation and coordination framework. These failures create uncertainties and risks for private house builders that partnered the government to access finance and subsidies for the provision of low-income housing in Jos. Also, there is limited participation of households due to lack of awareness on public policies. On the basis of the study's findings, some policy recommendations are made.
There are differences in the definitions of Alternative Building Materials (ABM) and differences in the terminologies that are used in describing ABM by different researchers in the construction industry. ABM is a generic term, which is characterised of or relating to a class or group of building materials, not really specific. It encompasses building and construction materials that in literature are referred to by different names such as alternative materials, local building materials, unconventional building materials, alternative residential construction materials, sustainable building materials, indigenous building materials, vernacular building materials, green building materials, environmentally responsible building materials, eco-friendly building materials, etc. The research employed systematic literature review and content analysis to generate and analysedall the necessary information as the methodology. A working (operational) definition of Alternative Building Materials is being offered as building materials that are an alternative to conventional building materials in the form of total or partial substitution of the materials or its constituents for the purpose of reducing the cost, addressing environmental issues or dealing with lack of conventional materials. The characteristics of ABM have been identified to include low or no chemical emissions that can lead to poor indoor air quality, recycled content (post-consumer and preconsumer), no CFC, HCFC, or other ozone depleting substances content, low embodied energy, locally produced, possibility of repairs and replacements with local means and social acceptability amongst others. Some of the benefits of utilizing ABM include; low embodied energy (often leading to reduced greenhouse gas emissions), ease of construction, widespread availability and low cost.
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