Construction rework cost calculator: office hours and site rework
Put a number on what nobody measures today: the hours your team spends redoing deliverables, and what published studies attribute to rework as a share of project value.
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- Sourced rates
- Your data stays in the browser
Calculate the cost of rework
Office rework
Site rework
What rework costs
- Annual office loss
- US$ 36,000
- Monthly loss
- US$ 3,000
- Of annual revenue
- —
- Days lost per month
- 5.0
- 8-hour working days
Scenarios on project value
| Study | Rate | Cost |
|---|---|---|
| GIRI, direct cost | 5.0 % | US$ 50,000 |
| EAN and UNAD, Colombia | 12.4 % | US$ 124,000 |
| GIRI, with indirect costs | 25.0 % | US$ 250,000 |
The rates are scenarios from published studies, not a forecast for your project. Your data is processed in your browser.
In short
The cost of rework has two readings. In the office, it's the hours the team spends redoing finished work, times its loaded hourly cost. On site, studies estimate it as a share of project value: about 5% in direct cost according to the UK's Get It Right Initiative, up to 12.4% according to Universidad EAN and UNAD research in Colombia, and up to 25% once indirect costs are included. One month of tracking is enough to get your own number.
How it's calculated
Monthly loss = rework hours per month × hourly cost
Annual loss = monthly loss × 12
Share of the business = annual loss / annual revenue
The hourly cost is the loaded cost: salary, benefits and payroll taxes, equipment, software and office, divided by productive hours. Using salary alone understates the loss.
The rework rates the calculator uses
| Study | What it measures | Rate on project value |
|---|---|---|
| Get It Right Initiative (UK) | Direct cost of avoidable errors | ≈ 5% |
| Universidad EAN and UNAD (Colombia, 2026) | Rework | up to 12.4% |
| Get It Right Initiative (UK) | Including indirect costs | up to 25% |
These are scenarios, not a forecast for your project. In the US, the FMI and PlanGrid study (2018) traced 48% of rework to poor communication and poor project data. Sources and detail are in the cost of rework in construction.
How to get your firm's real number
- For one month, have the team log in a shared sheet the hours spent redoing anything already delivered or calculated: date, person, what was redone and how many hours.
- Count how many revisions each deliverable needs before approval. Three or more as a habit points to a process problem.
- Compare budgeted quantities with what was actually built on the main line items.
Put those hours into this calculator and you get the annual loss. That's the number that starts the conversation with leadership.
Did the number come out high? We'll show you where it comes from.
In our BIM process audit, remote and four weeks long, we measure where the hours go and hand you a prioritized plan. The diagnosis is free and takes one week.
Free initial diagnosis · No commitment · We reply the same day
Frequently asked questions
What is the cost of rework in construction?
It depends on what you count. The UK's Get It Right Initiative estimates about 5% of project value in direct cost and up to 25% with indirect costs. In the US, FMI and PlanGrid put rework from poor data and miscommunication at about $31.3 billion in 2018.
What is a loaded hourly cost?
It's what an hour of work really costs the firm: salary, benefits and payroll taxes, equipment, software and office, divided by productive hours. It's higher than the hourly wage, and it's the right figure for measuring rework.
How do you measure rework hours if nobody logs them?
With a shared sheet for one month: date, person, what was redone and how many hours. No system needed. At the end of the month, total hours times the loaded cost gives the monthly loss.
Why do studies give such different rates?
Because they measure different things: some count only the direct cost of redoing work, others add indirect costs such as delays and latent defects, and each one covers its own country and project type. That's why the calculator shows them as scenarios rather than a single number.
How do you reduce construction rework?
By removing the manual steps where information splits from its source: quantities that come from the model, drawings that regenerate, automated standards checks before each deliverable, and coordinating disciplines in the model. We cover it in our article on the cost of rework.
Go deeper before you decide
The cost of rework in construction: what the studies measure, and how to reduce it with BIM
What rework costs in construction according to GIRI, FMI and CII, why most of it starts before the site, and how BIM and automation reduce it.
BIM Audit: What It Is, What It Checks (Full Checklist) and When Your Firm Needs One
A BIM audit checklist for Revit models and team workflows: naming, coordinates, warnings, information, model-to-sheet consistency and hours lost to rework.
Overnight Revit Automation: Check Every Model Every Night, Unattended
How to check Revit models overnight, unattended: what to measure, and how Revit Batch Processor, Model Checker, Design Automation or a plugin compare.
How to standardize BIM processes at your company without slowing production down (2026 guide)
What to standardize first, why BIM rollouts fail, how to handle team resistance, and a 90-day plan that works while production keeps running.
Stop tracking quantity takeoffs in Excel: the guide for engineering firms
Why tracking quantity takeoffs in Excel costs hours and errors with every design change, and how to pull them from the Civil 3D or Revit model.
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