Find six mistakes

Find six errors hiding in a small construction estimate.

Advanced45 min

On site

Check the estimate against the work

Illustrative road excavation with pipe installation, existing services and reinstatement boundaries.

Illustrative scene. Use the lesson figures and records for measurements.

Identify six estimating errors

There are six issue types across this supply-and-install estimate. Two rows refer to the same duplicate. Classify each row; leave a sound row as “No issue”.

Item	Description	Quantity basis	Rate	Total
1.01	Bulk excavation	1,200 m³	5.50	6,600
1.02	Bulk excavation repeated	1,200 m³	5.50	6,600
1.03	Concrete to slab	450 m²	117.50 per m³	52,875
1.04	Blockwork	500 m²	Labour 15; material 0	7,500
1.05	Manual trench excavation	800 m³ per hour	Crew 101 per hour	0.13 per m³
1.06	Concrete material	100 m³	91.50 × 3% waste	274.50
1.07	Formwork	100 m²	32.00	320
1.08	Lean concrete blinding	20 m³	105.00	2,100

scopeeconomics