Productivity Rates on Construction Sites and How to Measure Them
Productivity is the quantity of work one worker completes in a day — the link between quantities, durations and labour in any estimate or programme.
Why it is the most important number in an estimate
Every activity duration and every labour rate comes back in the end to one figure: how much a worker gets done in a day. Price plaster at 18 m² per worker per day and have your crew achieve 12, and the labour item rises by 50% without a single wage rate changing. Productivity is the variable that separates a realistic estimate from an optimistic one.
Indicative market rates
Figures to use as a starting point and then calibrate against your own reality: plaster 16 to 20 m² per worker per day, blockwork 8 to 12 m², tiling 8 to 12 m², painting 35 to 50 m², steel fixing 120 to 160 kg, formwork carpentry 12 to 18 m². These are ranges, not facts, and they move with the readiness of the work face, the type of element and the experience of the crew.
What actually lowers productivity
Not idle labour, as is usually assumed, but: waiting for materials, work faces that are not ready, several crews crowded into one area, rework caused by errors, and midday heat in the summer months. Four of those five are management decisions, not labour problems.
Building your own productivity library
Record for every principal activity: the quantity executed, the number of workers and the number of days. The division gives you your actual productivity. After three projects you hold figures truer than any general reference table — the most valuable asset your estimating department can own.
Worked example
On a villa, a crew of six completed 1,400 m² of plaster in 17 working days — 13.7 m² per worker per day instead of the 18 assumed. The cause was waiting for scaffolding on the façades, so the company corrected its estimate on the next project and improved scaffold readiness, reaching 16.5 m².
FAQ
Does doubling the labour halve the duration?
Not on most activities: crowding one work face lowers individual productivity, and the technical sequence prevents full parallel working. Effective acceleration comes from opening additional work faces, not from piling labour on.
How do I deal with the effect of summer heat?
Adopt a lower summer productivity explicitly in the estimate instead of assuming the same figure all year, and rearrange working hours for exposed activities. An optimistic assumption here shows up as a delay in August, not in the programme.
Is productivity the same in every city?
It varies with the availability of trained labour, site conditions and climate, which is why it is better to keep separate figures for the regions you work in regularly.
Put this to work with Project Planning & Scheduling
A realistic project schedule: activities, dependencies and critical path, intelligently generated
Explore Project Planning & Scheduling