Honest installed figures for 2026, by thickness and finish: 60mm grey blocks on a prepared base — the estate standard — at KES 2,200–3,200 per m² installed. 60mm coloured or pigmented blocks at KES 2,800–3,800 per m². 80mm heavy-duty blocks for driveways, yards and commercial traffic at KES 3,200–4,500 per m². The anatomy of the number: blocks themselves KES 950–1,400 per m² by class and colour; bedding and jointing sand with edge restraints KES 150–300; laying labour KES 300–500 per m²; and the base preparation beneath — subbase, bedding course, compaction — KES 400–800 per m² depending on existing ground. The comparison that matters: asphalt overlays run KES 1,500–3,000 per m² but demand rigid base engineering; concrete pavers demand less base precision but pay it back in repairability — a failed cabro panel lifts, re-beds and relays in hours, where asphalt failure patches show forever. Get your surface priced with the base itemised on the cost calculator — the base is where honest quotes separate from cheap ones.

The base is 80% of the paving that shows. The layered build, bottom-up: subgrade — the natural ground, excavated or filled to formation, compacted to 93–95% Proctor, because cabro is only as stable as what it sits on; soft spots excavated and replaced, black cotton removed or treated. Subbase — 100–150mm of compacted murram or crushed stone, the workhorse layer spreading loads and draining water; compacted in 150mm lifts to 95%+ density. Bedding course — 30–50mm of coarse, sharp sand screeded dead level across the laying face, the cushion that lets each block seat at its final level; bedding depth discipline matters — too thick lets blocks pump, too thin transmits point loads. Edge restraints — haunched kerbs or concrete edging around every free edge, before laying: the restraint is what keeps the field interlocked, and paving laid against nothing spreads, ruts and sighs within seasons. The red flags that predict failure: bedding sand rounded or dirty (it must be sharp and free-draining); subbase skipped 'because the ground looks firm'; and edges left unrestrained to save the kerb money. The road-engineering logic underneath all of it is mapped in our subgrade preparation guide — the same CBR and compaction discipline, one layer down.

The pattern is engineering as well as aesthetics — it decides how the field handles traffic. Herringbone at 45° or 90° — the interlock champion: every block locked by neighbours on two faces, the field behaving like a mat under braking and turning loads. The default for driveways, commercial yards and anywhere vehicles turn. Basketweave — pairs alternating direction; handsome and adequately interlocked for footpaths, patios and light domestic paving, but it tracks under heavy turning. Stretcher bond — rows offset like brickwork; fine for walkways and borders, weakest against vehicle loads — expect longitudinal creep on driveways. The laying discipline whatever the pattern: string lines and screed rails keeping levels true; blocks laid tight to each other, never spaced for 'sand gaps'; cutting with a block splitter or saw at edges, not a hammer; and the field compacted twice — once after laying to seat the blocks into the bedding, then again after jointing sand sweeps and vibrates into the gaps. Pattern choice is permanent: pick the interlock the traffic earns, and the paving pays for decades.

Four failure modes, four preventions. Sinking panels — the base beneath lost density: prevention is subbase compaction to specification, tested, not assumed; repair is lifting, re-bedding and relaying, which is exactly why cabro earns its premium. Spreading edges — missing or under-haunched restraints: prevention is proper kerbs or haunched edging on every free edge, laid before the field; repair means rebuilding the edge first, always. Rutting under wheels — thin blocks on weak bases: prevention is 80mm blocks on driveways and commercial traffic, herringbone, full edge restraint. Weed growth and joint washout — wrong jointing sand or no sealing: prevention is kiln-dried sand swept and vibrated into full joints, topped up after the first rains, with a sealant coat where aesthetics matter. The meta-lesson of cabro: almost every failure above the base is repairable in hours, and almost every failure below it was decided before the first block was laid — which is why the base lines on the quote deserve more scrutiny than the block samples.

Production rates for a competent crew: laying teams place 60–100 m² of blocks per day on a prepared base — a 500 m² estate driveway is a week's laying, a 2,000 m² parking area three to four weeks with edges and jointing. But the laying is the visible half of the calendar: base preparation typically matches or exceeds laying time — excavation or filling, subbase placement and compaction in lifts, bedding screeding — and curing-dependent edge haunches add days. Weather rules the sequence: bedding sand screeded ahead of rain washes and must be redone; jointing sand needs dry conditions to flow and settle. The realistic programme discipline that keeps clients happy: mobilise base crews first, let the laying follow a validated base, and never let the blocklayers outrun the compaction certificates — because the day saved skipping a density test is the season lost re-laying the panel. Our road construction earthworks guide carries the base-side sequencing in full.