Verified · May 20251 min read

● projectScaled · subnational · 2018

Gjenge Makers

Nairobi social enterprise founded by engineer Nzambi Matee that transforms plastic waste (mixed with sand) into paving blocks and construction bricks that are stronger, lighter and cheaper than concrete. It recycles dozens of tonnes of plastic per week and buys material from collectors, women's groups and young people.

Young green seedlings sprouting in a black plastic nursery tray

illustrative atlas image · Eleonora Sky / Pexels

GMGjenge Makers Ltdcompany NMNzambi Matee

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01 How it works

method · Recycling of plastic mixed with sand for construction materialsmethod · Purchase of material from collectors and community groups (buy-back)tool · Extrusion/pressing machine for plastic-sand paverstool · Plastic-composite pavers and bricks

02 What it stands on

Evidence level

Own experience

Grounded in published theory

Documented evidence elsewhere

Independently evaluated here

2 published documents support this project. No independent evaluation is in the atlas yet. Know of any? Contribute it.

The evidence 2 ›

ContextThe Kenyan Engineer Building a Sustainable Future With Recycled Plastic BricksallAfrica · 2025

ContextNzambi Matee - Young Champions of the Earth 2020 (UNEP)UNEP Young Champions of the Earth · 2020

03 Go to the source

Visit the official site ↗gjenge.co.ke