Mid-rise apartment schemes in Nairobi succeed or fail on three cost lines: substructure, structural frame, and finishes. Controlling those three protects the entire margin.
On a typical Nairobi apartment build, substructure absorbs 12%–18% of total cost. A proper soil investigation and a value-engineered foundation design (raft vs pad-and-beam vs piled) is the single cheapest way to protect that line — the report costs less than one truck of extra concrete.
The structural frame carries 25%–30% of cost. Rebar rate volatility means locking in a supply agreement early, buying in bulk against a schedule, and tracking wastage weekly. Anything over 5% wastage on rebar or 3% on concrete is a supervision failure, not a design one.
Finishes swing 20%–35% depending on target market. Standardise on three tile sizes, one sanitaryware brand, and one door leaf across the entire block — variety looks good on a moodboard and destroys the finishes budget on a live site.
- Invest in a proper soil test before finalising the foundation
- Lock rebar supply early and track wastage weekly
- Standardise finishes across the block to protect the budget