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How Do We Find Out What a Metre of Drainage or a Plot of Foundations Actually Cost Us, Against What We Priced?

Groundworks firms price drainage per metre and foundations per plot but never see actuals. We build activity costing from gang time, plant and materials.

Updated 3 min readBy SpiderHunts Technologies

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Quick answer — TL;DR

Actual cost per metre or per plot stays hidden because labour, plant and materials are costed to the job as a whole, not to the activity. We build activity costing that takes gang time, machine time and materials already recorded on site, allocates them to activities such as drainage runs or plot foundations, divides by the quantities completed, and compares the result with the rate in your price.

A job that made money, or did it?

Your estimator priced a housing site with rates per linear metre of drainage at different depths, per manhole, per plot for foundations and substructure, and per square metre of road. The job finished. The overall figures look fine. But nobody can tell you whether drainage made money and foundations lost it, or whether the deep runs were priced right, because costs went to the job, not to the activity.

The next site gets priced with the same rates, and the same question goes unanswered.

Why activity costs stay unknown

Recording costs by activity sounds like extra admin, so it does not happen. Timesheets record the job. Plant goes on the job. Materials are invoiced to the job. The quantities completed, metres laid, plots done, are known on site but never matched to the costs. Without both halves, there is no cost per unit.

  • Gang time is recorded by job, not by activity.
  • Plant time is charged to the job, if at all.
  • Materials invoices are coded to the job.
  • Quantities completed are not recorded alongside costs.
  • Estimators price from past rates they cannot check.

What not knowing costs

Rates that are too low get used again and again, and you keep winning work that loses money. Rates that are too high lose you tenders you could have won. Problems on a job are only seen at the end, in the total. And the knowledge your best gangs have about how long things really take never reaches the estimator.

The activity costing we build

  1. Your activity list is set from the way you price: drainage by depth band, manholes, foundations per plot, substructure, oversite, roads and so on.
  2. Gangers pick the activity when they record the gang's day, with a couple of taps, splitting the day if the gang did two things.
  3. Machine time is allocated the same way, from check-ins or telematics.
  4. Materials are allocated from orders, delivery logs and concrete dockets where they are tagged to an area or activity.
  5. Quantities completed, such as metres of pipe laid or plots finished, come from progress records or are entered weekly.
  6. Cost per unit for each activity is calculated weekly and compared with the rate in your price, by site.
  7. At the end of a job, actual rates by activity are saved, so your estimators can see them next to the rates they priced.
ActivityPriced rateActual so farTrend
Drainage, shallow bandPer metre, as pricedBelow pricedMaking money
Drainage, deep bandPer metre, as pricedAbove pricedLosing
ManholesEach, as pricedClose to pricedIn line
Plot foundationsPer plot, as pricedAbove on some plotsCheck depths

We calculate from your records. What rates to use next time is your estimator's decision.

Prices built on what things cost

You see during the job which activities are making or losing money, while there is time to act. Estimators price from actual rates by activity, from several jobs, instead of old rates handed down. Gangers see the effect of their work in figures, which helps good gangs make their case. And the conversation about a difficult job starts from which activity and why, not from the total.

Do you know your real cost per metre?

  • Costs are recorded by job, not by activity.
  • You cannot say which activities made money on your last job.
  • Estimators price from rates they have never checked.
  • Problems show only in the final total.
  • Quantities completed are not matched to costs.

FAQ

Frequently asked questions

The questions readers ask us after this guide.

Still have a question?

Ask us directly — a senior engineer will get back to you.

Ask about your project

Is this a lot of extra work for gangers?

It adds a tap or two when they record the day. We keep the activity list short and in their language.

Do we need all our records digital?

Labour and quantities are the essentials. Plant and materials make it more accurate and can be added over time.

Does it replace our accounts or job costing system?

No. It reads from them and adds the activity layer. Totals should agree with your job costs.

Can it help with price-work gangs?

Yes. Price-work payments are a cost per unit already, and can be compared with directly employed gangs.

What affects the cost?

Your activity list, how labour and plant are recorded today, and your accounts or job costing system.

Keep reading

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