To evaluate the effectiveness of in-situ informal settlement upgrading programs compared to relocation, and assess how upgrading can serve as climate adaptation infrastructure for vulnerable urban populations

Comparative analysis of 40 informal settlement upgrading programs across 20 countries, with outcome metrics including housing quality improvement, climate resilience gains, displacement prevention, and cost-effectiveness ratios compared to greenfield relocation alternatives.

In-situ upgrading programs demonstrate significantly better outcomes than relocation across multiple dimensions. Key findings: (1) Upgrading programs in Brazil (Municipal Housing Secretariat), Thailand (CODI Baan Mankong), and Kenya (Muungano) show 70-85% retention rates after 10 years, compared to 30-50% for relocation programs.

(2) Climate resilience benefits: upgrading programs that install drainage, flood barriers, and durable housing materials reduce climate disaster damage by 40-60% for covered settlements. (3) Average cost per household is 3,000-8,000 dollars for upgrading vs 15,000-50,000 dollars for relocation.

(4) Community-led upgrading (Thailand CODI model) outperforms top-down programs on both cost and satisfaction metrics. (5) However, only 15% of the 1 billion people in informal settlements have access to upgrading programs, representing a massive implementation gap.

(6) The most effective programs combine physical infrastructure upgrades with tenure security and livelihood support.