What Is Project Controls?
Project controls is a phrase borrowed from the main contractor world. On a big civil engineering job, a dedicated team of planners, quantity surveyors, and cost engineers spend their time monitoring budgets, programmes, and change — producing weekly dashboards and monthly cost reports that no one on your level ever sees.
But the concept behind it is simple, and it applies to every scaffolding contract you run.
Three things, always. Project controls is knowing whether you're on time, on budget, and whether any changes have been captured. That's it. Everything else is detail.
Here's how the main contractor's version compares to what you actually need to run.
Main Contractor
Their version
- Primavera P6 or MS Project with resource-loaded programmes
- Monthly CVR (Cost Value Reconciliation) reports
- Earned value metrics — SPI, CPI, EAC
- Risk registers and contingency drawdown logs
- Dedicated cost engineers and planners
- S-curves and cash flow forecasts
Scaffolding Contractor — Your version
What you need
- A simple weekly cost tracker: hours and materials vs. budget
- A progress report your client actually reads
- A change log that captures every instruction before you do the work
- A cost-to-complete figure updated weekly
- Three or four KPIs per project, no more
The point isn't to replicate the main contractor's process — it's to build the habit of knowing where you stand at any given point. That habit is what separates managers who get caught out on the final account from those who don't.
Tracking Cost Against Budget
Before anything else, you need a budget. Not the contract value — your internal cost budget. What does it actually cost you to deliver this job? Labour, materials, plant, transport, and any preliminaries.
Key Concept
The Cost Budget
Your cost budget is what you expect to spend to complete the work. The contract value minus your cost budget is your target margin. If you don't know your cost budget before you start, you can't track whether you're making money.
How a main contractor does it
A main contractor builds a detailed cost plan broken into work packages, each with its own cost code. Every purchase order, labour ticket, and plant hire invoice is coded and matched against the plan. A QS produces a monthly CVR showing what's been spent, what's been earned (valued), and what the forecast outturn cost will be.
What it means for you
You don't need cost codes and a QS. But you do need to know, every week, three things:
The gap between step 1 and step 2 tells you whether you're over-spending relative to progress. If you've spent £30,000 but you've only done £22,000 worth of work, you're already £8,000 behind — and you haven't even finished yet.
Don't wait for the final account. By the time the job is finished, it's too late to fix a cost overrun. Weekly tracking gives you time to do something about it — change gang sizes, renegotiate a materials price, claim a variation.
The downloadable cost tracker in this module is built around these three questions. Fill it in every week. It takes twenty minutes and it tells you everything you need to know.
Earned Value — In Plain English
Earned value sounds like a finance concept. It's actually very simple, and it's one of the most useful things you can track on a scaffolding project.
Main Contractor — formal definition
EVM terminology
- BCWP — Budgeted Cost of Work Performed (earned value)
- ACWP — Actual Cost of Work Performed
- CPI — Cost Performance Index (earned ÷ spent)
- SPI — Schedule Performance Index
- EAC — Estimate at Completion
What it means in your world
The plain English version
- Earned value = what the work you've done should have cost
- Actual cost = what you actually spent doing it
- If actual > earned: you're over-spending
- If actual < earned: you're running efficiently
- The gap tells you where your final account is heading
Here's a real example. You price a scaffold erect at £18,000. Two-thirds of the way through, you've spent £14,000. Is that good or bad?
On its own, you don't know. But if two-thirds of the erect is genuinely complete, then the work you've done should have cost £12,000 (two-thirds of £18,000). You've spent £14,000 to earn £12,000 worth of work. That's a £2,000 gap — and you're only two-thirds through.
Earned Value − Actual Cost = Cost Variance
Positive = efficient. Negative = overspending. Update it every week.
You don't need software to do this. The cost tracker in this module calculates it for you. All you need to do is enter your actual costs and an honest assessment of percentage complete — and the spreadsheet does the rest.
Watch Out
Percentage complete is not the same as percentage billed. Don't confuse how much you've invoiced with how much of the work is actually done. If you've billed 60% but only completed 40%, you'll overstate your progress and understate your overrun.
Progress Reporting
A main contractor's monthly progress report runs to thirty pages. It covers programme, cost, quality, health and safety, risk, outstanding information, and commercial matters. It's written by a project manager, reviewed by a commercial manager, and submitted to the client's project manager, who files it and reads the executive summary.
Your weekly report to a main contractor site manager needs to do one thing: tell them what's happened this week, what's happening next week, and flag anything they need to act on.
Main Contractor
Their monthly report
- Programme update with critical path commentary
- Cost report and CVR summary
- Quality and defects register
- Outstanding RFIs and information required
- Risk register update
- Health and safety statistics
Your weekly report
Five things. One page.
- Work completed this week (area, lift, bay count)
- Work planned for next week
- Instructions received — and whether they've been confirmed in writing
- Any access, design, or programme issues causing delay
- Anything you need from the main contractor before next week
Short, factual, sent every Friday. That's it. A report that arrives every week, on time, builds credibility. A thirty-page document sent when someone asks for one builds nothing.
Your report is also your protection. If a delay is caused by late access or a late drawing, it needs to be in writing. A weekly report that documents the issue — sent to the main contractor and kept on file — is exactly that record.
The weekly report template in this module is structured around those five points. Fill it in, send it as a PDF, keep a copy. Do it every week without fail.
Change Control
Change is where most scaffolding margin gets lost. Not through bad pricing — through changes that happen without being captured, priced, or agreed before the work is done.
The Rule
Log It Before You Do It
Every change to scope, sequence, or specification needs to be logged before work starts. Once you've done the work, your negotiating position is almost zero. The main contractor knows you're not going to pull the scaffold down.
How a main contractor manages change
On a formal JCT or NEC contract, change is managed through a defined process. The architect or engineer issues an instruction. The contractor prices it, submits a quotation, and waits for formal acceptance before proceeding. Each change gets a reference number, a value, and a contract programme adjustment if required.
In reality, main contractors often bypass their own process on site — and they'll expect you to do the same. Resist it.
What good change control looks like on a scaffold contract
Unagreed variations on the final account are worth roughly 50p in the pound. Agreed variations submitted monthly are worth the full amount. That difference is pure margin.
Forecasting to Completion
A forecast to completion answers one question: based on everything you know right now, how much will this job cost by the time it's finished?
Main contractors call this the Estimate at Completion (EAC). They calculate it using earned value formulas and update it monthly in their cost report. You don't need the formula — you need the habit.
Main Contractor
EAC formula
- EAC = BAC ÷ CPI
- (Budget at Completion ÷ Cost Performance Index)
- Calculated by the QS monthly
- Reviewed in the commercial team meeting
- Reported to the client's cost manager
Your version
Cost to complete
- What have I spent so far?
- What will it cost to finish what's left? (honest estimate)
- Add them together — that's your forecast final cost
- Forecast final cost vs. budget = your projected margin (or loss)
- Updated every week, in your cost tracker
The key word is honest. Your cost-to-complete estimate needs to reflect what it will actually cost — not what you'd like it to cost. If your gang has been slower than planned for three weeks, don't assume they'll suddenly speed up for the remaining four.
Practical Tip
Do your cost-to-complete every Friday before you submit your weekly report. If the number is moving in the wrong direction, you need to know now — not when you're building the final account. Early visibility gives you options. Late visibility gives you arguments.
If your forecast shows the job will go over budget, you have two choices: find costs to cut, or find variations you haven't claimed yet. Neither is easy after the fact. Both are possible if you catch it early.
KPIs for Scaffolding Projects
A KPI (Key Performance Indicator) is only useful if it tells you something you can act on. Most KPI lists are too long, too vague, or borrowed from a main contractor context where they don't apply.
Here are the ones that actually matter for a scaffolding subcontractor.
| KPI | How to measure it | What it tells you | |
|---|---|---|---|
| Labour productivity Core | Actual hours per tonne erected vs. planned hours per tonne | Whether your gang is on target. If actual hours per tonne are running above plan, your labour cost will overrun. | |
| Cost variance Core | Earned value minus actual cost (weekly) | Whether you're over- or under-spending relative to progress. The single most important number on the tracker. | |
| Variation capture rate Core | Value of agreed variations ÷ value of instructions issued | How much of your extra work is being paid for. Below 80% suggests changes are being done without proper agreement. | |
| Programme adherence | Planned sections complete vs. actual sections complete per week | Whether you're on track against the erection programme. Slippage here usually means more prelims cost. | |
| Materials wastage | Materials ordered vs. materials installed (per section) | Useful on large or long-duration contracts. High wastage often points to gang discipline or storage/security issues. | |
| Defect-free handovers | Sections signed off first inspection vs. total handovers | A measure of quality control. Re-inspection costs are real but rarely tracked. | |
Three KPIs, tracked weekly, is enough for most projects. Labour productivity, cost variance, and variation capture rate will tell you the story of almost any scaffolding contract. Add more only if the project demands it.
Making Decisions from Data
The point of all this — the tracker, the report, the KPIs — is not to produce paperwork. It's to make better decisions, earlier.
Every number you track creates a moment for a decision. Labour hours over budget this week: is it a one-off or a trend? Materials spend higher than expected: is it a delivery timing issue or are you losing kit? Variation capture rate dropping: are instructions being actioned without agreement?
Without controls
How it usually goes
- Job finishes, final account is built from memory and site paperwork
- Variations can't be substantiated — the site manager has moved on
- Labour overrun emerges only when the wages are totted up
- Final account is agreed at less than entitlement
- Post-project review produces no useful learning
With controls in place
How it should go
- Cost overrun spotted in week 3 — gang size adjusted
- Variation logged same day, priced by end of week, agreed by month end
- Progress report flags access delay, written down at the time
- Final account built from live data — nothing missing
- Next project's budget built from this project's actual costs
The second column doesn't require more time or more people. It requires a discipline — a weekly habit of looking at the numbers and acting on them. That's the difference between a scaffolder running a project and a contract manager running a business.
The Bigger Picture
Project Data Builds Company Knowledge
Every project you control properly gives you better data for the next one. Actual labour hours per tonne on this job becomes the benchmark for pricing the next bid. Actual materials usage becomes your waste factor. Over time, your estimating gets more accurate — and your margin gets more predictable.
Downloads
Handover and close-out tools. Coming soon.
Knowledge Check
10 questions — 8 correct to pass — unlimited retries
Complete.
You've got the tools to track cost, capture change, and report progress. Every week, on every job.
Continue to Module 8References
Harvard-style referencing applies throughout the course.
NASC Guidance
- NASC (2019) CG12:19 Contract Clauses.
- NASC (annual) Year Book and Statistics. London: National Access & Scaffolding Confederation.
Standard Forms of Contract
- Joint Contracts Tribunal (2016) Standard Building Sub-Contract Conditions (SBCSub/C 2016). London: Sweet & Maxwell.
- NEC (2017) NEC4 Engineering and Construction Subcontract (ECS). London: ICE Publishing.
- Construction Industry Publications Ltd (2018) Scaffolding Contract 2018.
Legislation
- Housing Grants, Construction and Regeneration Act 1996. c.53. Available at: legislation.gov.uk/ukpga/1996/53.
- Late Payment of Commercial Debts (Interest) Act 1998. c.20. Available at: legislation.gov.uk/ukpga/1998/20.
RICS
- Royal Institution of Chartered Surveyors (current edn) Cost Reporting in Construction. London: RICS.
- Royal Institution of Chartered Surveyors (current edn) Final Account Procedures. London: RICS.
CIOB
- Chartered Institute of Building (2018) Guide to Good Practice in the Management of Time in Major Projects. 2nd edn. Chichester: Wiley-Blackwell.
Industry Reports and Research
- Building Cost Information Service (annual) BCIS Construction Cost Indices. London: BCIS / RICS.
- Health and Safety Executive (current edn) Managing Health and Safety in Construction (L153). Bootle: HSE.
Case Law
- Walter Lilly & Co Ltd v Mackay [2012] EWHC 1773 (TCC) (on concurrent delay and extensions of time).
- S&T (UK) Ltd v Grove Developments Ltd [2018] EWCA Civ 2448 (on payment notice and pay-less notice procedures).