Almost every Kenyan building horror story, told backwards, arrives at the same scene: money released ahead of work, and no measured document to argue from when the two drifted apart. The fix is not finding a saint of a contractor. It is a payment structure where money follows verified work — boring, contractual, and effective, on-site or from the other side of the world.
The principle: pay against the bill, not the vibes
A priced bill of quantities turns your house into measurable line items — so much walling, so much roofing, at stated rates. That document is what makes staged payment possible at all: a stage is complete when its measured items are done, not when the site “looks far”. Without a BoQ, every payment negotiation is two people describing a building from memory. With one, it is arithmetic.
A staging that works
The stage boundaries worth using are the ones you can verify by looking: each ends at a state of the building that either exists or does not. A common shape for a residential build runs like this — the exact split is negotiated, and the percentages matter less than the rule that no stage is prepaid:
- Mobilisation — small, and the exception. The one genuinely advance payment, for site setup and first materials. Keep it modest; a contractor who needs a large advance to start is financing their last project with your first.
- Substructure complete. Foundations in, slab cast, verified before the next shilling. Ground work is where surprises live, so it is also where the BoQ's provisional items get honestly re-measured.
- Walling and ring beam. The shell stands to roof level. Easy to verify from ten photographs — or one visit.
- Roof on. The building is weathertight. A meaningful stage everywhere, and non-negotiable before finishes money moves.
- Finishes and services. The long tail — plaster, floors, fittings, wiring, plumbing. Split it further on a bigger house; it is where quality disputes concentrate.
- Retention — held past handover. A final slice, commonly around five percent, held for an agreed defects period. It is the only language a cracked wall speaks fluently.
Verification is a process, not a mood
Decide before the first payment how completion is evidenced: dated photographs against the drawing, a site visit by someone who answers to you, measured items ticked against the bill. Building from abroad changes the distance, not the method — the drawing and the bill are the shared truth everyone argues from, which is why they must exist before the contractor does. What you must never do is let the evidence be the person asking for the money.
Where the documents come from
This whole structure stands on two artefacts: a dimensioned drawing and its priced bill of quantities. Chimbuko produces both from your own brief — the Technical Pack (KES 9,500, VAT inclusive) carries the elemental BoQ of your actual plan, rates dated, previewed watermarked before you pay. Stage it, tender it, and pay against it. A build where money follows measured work is not slower. It is just harder to steal from.