The Diaspora Homebuilder's Stage-by-Stage Construction Guide for Kenya
What should actually be happening at each phase of your Kenyan home build — and the specific questions to ask (or have a GRUTH inspector verify) at each milestone.
Building from abroad: the knowledge gap is the risk
Most diaspora Kenyans are not construction professionals. When a contractor sends you an update claiming "roofing is 60% complete," you may have no way to know whether that is true, accurate, or even technically coherent.
This guide gives you the vocabulary, the milestones, and the verification questions for every major phase of a Kenyan residential build.
Phase 1: Site Preparation and Foundation
What should be happening:
- Plot clearing and levelling
- Foundation trenches dug to depth specified in the structural drawing (typically 600mm–900mm for a single-storey residential build in stable soils)
- Hardcore filling and compaction
- Blinding concrete layer laid
What to verify:
- Foundation depth matches the structural drawings (ask for a photo with a tape measure in frame)
- Soil condition — dark or expansive clay soil requires wider or deeper foundations
- Are the foundation walls straight? A simple plumb line check.
Common fraud here: The contractor begins building without approved structural drawings, or uses thinner concrete mixes than specified to reduce material cost.
Phase 2: Slab and Ground Floor
What should be happening:
- DPC (damp-proof course) membrane laid
- Mesh reinforcement placed
- Concrete slab poured (minimum 100mm for residential ground floors)
- Curing for at least 7 days
What to verify:
- Was the slab poured in one continuous pour or patched? (Patching creates structural weakness)
- Is the surface level? Check with a long straight-edge.
- Curing — was it watered and covered properly?
Phase 3: Walling
What should be happening:
- Block or brick laying from slab to lintel height
- Regular plumb and level checks
- Lintels above all openings (windows, doors)
- Ring beam (bond beam) at lintel level to tie all walls together
What to verify:
- Block/brick type and size matches the specification in your BQ
- Mortar mix quality (ask for the ratio — typically 1:4 cement:sand for load-bearing walls)
- Lintel presence over every opening — missing lintels cause cracking within 2–3 years
Common fraud here: Using cheaper hollow blocks where solid blocks were specified; omitting the ring beam entirely.
Phase 4: Roofing
What should be happening:
- Timber wall plate fixed to ring beam
- Roof trusses/rafters erected and braced
- Roofing sheets fixed (gauge specified in your BQ — typically gauge 28 for residential)
- Fascias, gutters, and downpipes
What to verify:
- Are the trusses spaced correctly? (Typically 600mm or 900mm centres)
- Do the roofing sheets match the gauge specified?
- Is bracing in place? (Diagonal bracing prevents racking failure)
Phase 5: Mechanical, Electrical, and Plumbing Roughin
What should be happening:
- Conduit runs chased into walls for electrical cabling
- Plumbing supply and waste pipes positioned before plastering
- Junction boxes positioned for sockets, switches, lights
What to verify:
- Are socket positions matching the electrical drawing?
- Are pipes in walls (not surface-run after plastering — a common cost-cutting shortcut)?
Phase 6: Plastering and Finishes
What should be happening:
- Internal and external plastering
- Floor screeding
- Tiling (if in scope)
- Window and door frames fixed
What to verify:
- Plaster thickness — minimum 12mm internally, 15mm externally
- Are tiles grouted and level? Hollow tiles (tap them — they sound dull) will delaminate
- Frame fixings — are frames anchored with plugs, not just mortar?
The verification schedule we recommend
| Phase | When to Inspect | Why |
|---|---|---|
| Foundation | Before concrete pour | You cannot inspect what's been buried |
| Slab | During pour and after cure | Patch repairs are invisible once finished |
| Walling | At lintel height | Ring beam and lintel compliance |
| Roof | During and after erection | Gauge, spacing, bracing |
| Pre-plaster | Before any plastering | Electrical and plumbing positions |
| Handover | Final walkthrough | Snag list before contractor leaves |
DM 'BUILD' to discuss a package that covers your specific project phases.
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