- Distinguish cost reporting from cost control
- Run a weekly Cost-Value Reconciliation and read what it is telling you
- Track costs daily across labour, materials, plant, daywork and variations
- Tie daily cost tracking back to the productivity assumptions in your tender
- Manage variations through written instructions and a Site Instruction log
- Submit compliant daywork sheets inside the 7-day rule
- Build payment applications that meet the s.110A notice requirements of the Construction Act
- Apply NASC retention policy, challenge amended retention clauses and track release
- Maintain the records that win disputes
1. What Project Controls Cover
Project controls are the systems that turn the contract into a profitable job: cost reporting, CVR, variations management, daywork, applications for payment, programme tracking, records and KPIs. (Programme tracking sits in Module 5. This module handles the money side.)
Strip it back and you are tracking three things. Time. Cost. Change. Everything in this module is a tool for keeping those three visible while there is still time to act on them.
The rhythm that works is daily logs, weekly reporting. Log the work done every day. Report on it every week. Monthly reporting creates delay: it separates the work from the invoice or the claim, and makes both harder to evidence. If your contract carries a 7-day validity period on claims, a monthly reporting cycle means most of your claims are dead before you write them. Know what was built and when, so every variation claim goes in inside its contractual window. Anything beyond that window is risk you are carrying for free.
The main contractor's version and yours
On a major project the MC runs project controls as a department: planners, quantity surveyors and cost engineers producing resource-loaded programmes, monthly CVR packs, earned value indices, risk registers and cash flow S-curves. Useful at their scale. Overkill at yours. You don't need the department. You need the habit. What a scaffolding contractor actually needs:
- A weekly CVR: cost incurred against value earned, per job
- Daily cost tracking across five categories: labour, materials, plant, daywork, variations
- A Site Instruction log that captures every instruction before the work is done
- A one-page weekly report the MC actually reads
- A cost-to-complete figure updated weekly
- A handful of KPIs, watched and acted on
2. Quick Definitions
Project controls terms used through this module. Tap each to see the detail.
3. Cost Reporting vs Cost Control
Two different things, often confused.
- Cost reporting tells you what has been spent, earned and forecast. It looks backwards.
- Cost control is the decisions that change the future cost trajectory: resize the gang, off-hire the idle plant, chase the variation, renegotiate the delivery. It looks forwards.
Both start from the same number, and it isn't the contract value. It's your internal cost budget: what it should cost you to deliver the job in labour, materials, plant, transport and preliminaries. Contract value minus 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, and nothing else in this module will save you.
A report you don't act on isn't control. It's bookkeeping.
Detailed RICS guidance on the structure and frequency of cost reports.
4. Cost-Value Reconciliation (CVR)
CVR compares cost incurred against value earned. Run it weekly or monthly. Never less. On any job over a value threshold you set, and the threshold should be low, the CVR is the report that tells you whether the job is making money while you can still do something about it.
4.1 What the CVR shows
- Cost to date: what you've spent. Labour, materials, plant, sub-subcontractors, transport
- Value to date: what you've measured and applied for. Erections complete, hire periods, dayworks, variations
- Cost-to-complete: the forecast remaining cost
- Forecast final value: expected total revenue at job end
- Gross profit (or loss) to date = value to date minus cost to date
- Forecast final gross profit = forecast final value minus total forecast cost
4.2 Earned value, in plain English
Spend on its own tells you nothing. You price a scaffold erect at £18,000. Two-thirds of the way through, you've spent £14,000. Good or bad? On its own, you can't tell. But if two-thirds of the erect is genuinely complete, the work done should have cost £12,000. You've spent £14,000 to earn £12,000 of value. That's a £2,000 gap, and you're only two-thirds through.
That is all earned value is: what the work you have actually done should have cost, set against what it did cost. Earned value minus actual cost is your cost variance. Positive means you're running efficiently. Negative means you're overspending. Update it every week.
One warning. Percentage complete is not percentage billed. If you've billed 60% but only built 40%, you'll overstate progress and understate the overrun. Measure what's built, not what's invoiced.
4.3 Cost-to-complete: the honest number
Cost to date plus cost-to-complete gives you the forecast final cost. Set that against forecast final value and you have your projected margin, or your projected loss. The key word is honest. If the gang has been slower than planned for three weeks, don't assume they'll suddenly speed up for the remaining four. Forecast from what the job is doing, not from what the tender hoped.
Early visibility gives you options. Late visibility gives you arguments.
4.4 Why CVR matters
- It spots losing jobs early, while there is still time to fix them
- It drives variation chasing: unvalued, uninvoiced variations distort the value line
- It drives daywork submission: unsigned daywork distorts the value line
- It drives application discipline: under-applied work distorts the value line
A CVR is only as honest as its value line. If the variations aren't valued, the daywork isn't signed and the application is light, the CVR isn't reporting the job. It's repeating your hopes back to you.
The CIOB framework for cost reporting and CVR on built-environment projects.
5. Daily Cost Tracking: The Foundation of CVR
CVR is the report. Daily cost tracking is the data behind it. If you don't track costs daily, your CVR is fiction.
Five categories, each measured against what you priced at tender (Module 2). Tap each to see what to capture and what it looks like on a live job.
Tying the daily numbers back to the tender
Your tender used assumed productivity rates: m² erected per man-hour, weight of kit per scaffold, hire periods. Daily tracking either confirms the assumption or breaks it.
If the tender said 1.5 m² per man-hour and the site is giving you 1.0, the job is going to lose money on the labour line. The earlier you spot it, the more time you have to act: variations, written notice to the MC for productivity loss, additional resource, a recovery plan. Spot it at the final account and all you can do is count it.
The tender is a hypothesis. Daily cost tracking is the experiment. Run the experiment, collect the data, adjust before the loss is locked in.
Standard measurement rules. Useful for matching daily measurement to tender allowances.
The methodology for building the rates that daily tracking is measured against.
6. Variations: The Discipline That Pays
A variation is any change to the original scope. Most subcontracts require:
- A written instruction from an authorised representative
- Notification by you where the change arrives without one
- Pricing on the contract method: rates, fair valuation or daywork
- Inclusion in the next interim payment
Variations should be acknowledged in writing within 7 days. Verbal instructions confirmed in writing immediately.
The five-step discipline
Change is where most scaffolding margin gets lost. Not through bad pricing: through changes done without being captured, priced or agreed before the work happened. Once the scaffold is up, your negotiating position is close to zero. The MC knows you're not going to pull it down.
- Log it. Verbal, email or a note on a drawing: log it the moment it lands. Who gave it, when, and what for. That is the Site Instruction log.
- Acknowledge it in writing. Same day. A short email is enough (template below).
- Price it before you start. Submit the variation price before you mobilise on the change. If the site manager says "just crack on, we'll sort the price later", get that instruction in writing too.
- Get it agreed. A written acceptance of your price, or a written instruction to proceed, is your entitlement. A verbal yes on site is not.
- Apply for it. Agreed variations go into the next application with the instruction reference and the agreed value. Don't wait for the final account.
"We confirm receipt of your instruction given verbally by [name] at [time] on [date] to [describe the work]. We will treat this as a variation under [clause reference] and will submit our quotation within [X] days. Please confirm by return."
If it's not in writing, it didn't happen. Use a Site Instruction log to capture every verbal instruction the same day.
How the three forms value a variation
Every standard form has a variation procedure, but the procedures are not the same. JCT works through Architect's Instructions and Schedule 2 Quotations. NEC turns every variation into a Compensation Event, valued on forecast Defined Cost plus Fee. NASC operates the simplest mechanic: written instruction, valuation against the Schedule of Rates, plus any direct loss and expense. The differences matter most at the boundary of scope, where progressive dismantling, partial off-hires and drawing revisions get treated differently in each form. The table below sets out where the three forms agree and where they diverge.
| Topic | JCT SBCSub/C 2016 | NEC3 ECS | NASC Scaffolding Contract 2018 |
|---|---|---|---|
| Instruction requirement | Architect's Instruction in writing, oral confirmed within 7 days (Clause 3.10) | Project Manager's instruction in writing, valued as a Compensation Event (Clauses 14.3 and 60.1(1)) | Instructions in writing, oral confirmed in writing within 2 working days (Clauses 6.1 and 7.1) |
| Valuation method | Schedule 2 Quotation if requested, otherwise Sub-Contract Conditions valuation rules (Clause 5.6) | Compensation Event valuation: forecast effect on Defined Cost plus Fee (Clause 63) | Schedule of Rates, or fair and reasonable rates where the SOR does not apply, plus direct loss and expense (Clauses 7.2 and 7.3) |
| Partial or progressive dismantling | Treated as scope change under the Sub-Contract Variation procedure (Clause 5.1) | Compensation Event where an instructed change affects the Works (Clause 60.1(1)) | Express clause: partial dismantling instructed during hire is a Variation (Clause 7.5) |
| Direct loss and expense | Loss and expense via the Schedule 4 procedure (Clauses 4.19 to 4.22) | Captured within the CE valuation, no separate loss and expense head (Clause 63) | Direct loss and expense expressly recoverable on a Variation (Clause 7.2) |
Clause 7.5 is the most commonly missed variation in scaffolding subcontracts. The MC tells a gang to drop a lift, take down a tower, alter an access. That is a Variation. It requires a written instruction, and it triggers the Schedule of Rates plus any direct loss and expense. Log it the same day or lose it.
An unagreed variation at the final account is worth roughly 50p in the pound. The same variation agreed in writing and applied for in the month is worth the full amount. The difference is decided by paperwork discipline, not negotiation skill.
7. Daywork Records and the 7-Day Rule
Daywork sheets must be submitted within 7 days. Late means the claim may be invalid. A signature confirms attendance, not value.
Daywork is how you get paid for work that can't sensibly be measured: attendances, standing by, clearing access, the odd jobs the MC instructs on the day. It only pays if the paperwork is right, and the paperwork has a deadline.
Every sheet carries:
- Date, site and contract reference
- Operatives' names, grades and hours
- Plant used, with type and hours
- Materials supplied, with type and quantity
- An authorised signature, with date
Get the sheet signed by an authorised MC representative at the end of the shift. Not the next day, not at the weekly meeting. Then get it to the MC's QS within 7 days. Then track three numbers against the monthly application: sheets generated, sheets signed, sheets in the next application. Any gap between the three is money leaking.
The signature line cuts both ways. Their signature confirms attendance, not value: it doesn't concede your price. But your unsigned sheet proves nothing at all.
A signed daywork sheet proves the men, the hours and the kit were there. An unsigned one is a story. Get the signature before the gang leaves site.
The industry-standard definition of the prime cost of daywork. The basis for building and defending your daywork rates.
8. Applications for Payment
Applications aren't invoices. They're the formal mechanism by which you claim the sum due at each interim valuation date, and under the Construction Act they can do legal work an invoice never does.
Your application can serve as the payment notice for s.110A purposes.
The Act (as amended by the Local Democracy, Economic Development and Construction Act 2009, Part 8) sets the statutory payment floor: a notified sum, a payment-notice window, a pay-less-notice window and a final date for payment. If the payer serves neither notice, the notified sum becomes due.
The notice cycle to monitor on every job:
- Submit the application by the application date
- Payer's payment notice (s.110A): typically 5 days after the application
- Payer's pay-less notice (s.111): typically 5 to 7 days before the final date for payment
- Final date for payment: typically 21 to 30 days after the application
- If no s.110A notice and no s.111 notice arrive, the full notified sum becomes due
Cash flow on a scaffolding job stands or falls on the application cycle. The Construction Act sets the statutory floor under all three forms. The forms then layer their own rules on top. NASC operates on monthly cycles with 28 days to the final date and 8% above base on overdue sums. JCT carries shorter cycles and lower interest. NEC ties the cycle to assessment dates set in the Subcontract Data. The differences in interest rate alone are commercially material. The table below puts them side by side.
| Topic | JCT SBCSub/C 2016 | NEC3 ECS | NASC Scaffolding Contract 2018 |
|---|---|---|---|
| Application frequency | Interim Payments per the Sub-Contract Particulars, typically monthly (Clause 4.9) | Assessment by the Project Manager at assessment intervals, typically monthly (Clauses 50 to 51) | Monthly, not later than one month after commencement (Clause 14.1) |
| Application content requirement | Stated due amount, basis of calculation, and sums applied for (Clause 4.9.1) | Subcontractor's assessment, basis of calculation (Clause 50.4) | Sum considered due, basis of calculation: value of work per the SOR or Contract Sum, Variations, less amounts previously paid (Clauses 14.2.1 to 14.2.3) |
| Final date for payment | 21 days after the due date by default, Sub-Contract Particulars may vary (Clause 4.10) | Three weeks after the assessment date, or as the Subcontract Data states (Clause 51.2) | 28 days from the application date (Clauses 14.3 to 14.4) |
| Late payment interest | 5% above Bank of England base rate on unpaid sums (Clause 4.10.5) | Interest at the rate stated in the Subcontract Data, often Bank base rate plus 2% (Clause 51.4) | 8% above Bank of England base rate on overdue sums (Clause 14.5) |
NASC carries the highest standing interest rate of the three. Reserve the statutory right under the Late Payment of Commercial Debts (Interest) Act 1998 in your standard terms, but where the NASC form applies, clause 14.5 is the live contractual entitlement and the one to quote in the chase letter (§13).
The Court of Appeal on payment-notice and pay-less-notice procedures: where the payer serves neither notice, the notified sum in the application becomes the sum due. Module 8 covers what happens when the notices fail and the dispute starts.
A missed application date is a self-inflicted cash-flow injury. Diary every application date and every notice deadline for the life of the job.
9. Schedule of Rates Valuations
The 32-item NASC Schedule of Rates. Use it for variation valuations and apply the height-band uplifts.
The Schedule of Rates is how variation work gets valued without a fresh negotiation every time. The discipline that makes it pay:
- Measure on the day, not at month-end
- Apply the height-band uplift before the rate
- Distinguish hire (a running charge) from erection and dismantle (one-off charges)
- Reconcile the measure against your installed materials list weekly
Month-end measures are reconstructions, and reconstructions get challenged. A measure taken on the day, against the drawing revision in force that day, is a contemporaneous record (§12). It holds. The weekly reconciliation against the installed materials list keeps the measure and the kit on site telling the same story, which is exactly what the QS will test.
Measure it the day you build it. The height band, the rate and the drawing revision are facts on the day and arguments a month later.
10. Retention
3% is standard. Anything above 5% should be challenged. Half released at the scaffolder's practical completion, the rest at the end of defects.
Retention is one of the few topics where the NASC standard form takes a deliberate position by what it leaves out. There is no retention clause. Any retention in your subcontract on the NASC form is a main contractor amendment, which means it is negotiable. JCT and NEC start from the opposite position: retention is built in, and the discussion is about rate and release triggers.
The commercial consequence is significant. Recent insolvencies (Carillion in 2018, ISG in 2024) destroyed tens of millions of pounds in subcontractor retentions that were never recovered. Money already earned, held by someone who then went under.
Legal changes to retention have been proposed and may take effect over the next few years. Until any phase-out lands, expect retention clauses to keep appearing in amended subcontracts, and manage them under the rules as they stand. To confirm before publication: the named bill or instrument and its dates for the proposed retention changes.
| Topic | JCT SBCSub/C 2016 | NEC3 ECS | NASC Scaffolding Contract 2018 |
|---|---|---|---|
| Default retention rate | 3%, reducible by the Sub-Contract Particulars (Clause 4.15) | Set in Subcontract Data Part Two, typically 3% to 5% (Clause X16 if used) | None in the standard form, retention is a Main Contractor amendment (no clause) |
| Release trigger, first half | Sub-Contractor's practical completion of the Sub-Contract Works (Clause 4.15.2) | Subcontractor's Completion certified by the Project Manager (Clause 30) | Negotiate at tender: write release on completion of dismantle and last load off (negotiated) |
| Release trigger, second half | Issue of the certificate of making good defects (Clause 4.15.3) | Defects Date, typically 52 weeks after Completion (Clause 43.2) | Negotiate: typically end of defects period, requested in writing on the day (negotiated) |
| Position if main contractor becomes insolvent | Retention held on trust where the contract so provides; risk where it does not | Retention held in trust if Option X16 is selected with a trust fund | No retention clause means no retention held, no exposure on this head in the standard form (no clause) |
The absence of a retention clause in the NASC standard form is a deliberate commercial choice. Where the MC amends the form to introduce retention, push back. If you have to accept it, insist on a clearly stated rate, fixed release triggers, and ideally a retention bond instead.
Tracking retention
- Retention should not be withheld as general security against disputes
- Practical completion of the scaffolding usually means dismantle complete and last load off site
- Issue a written request for release of the first half immediately on practical completion
- Diary the second half against the defects expiry date, and request it in writing on the day
"The scaffolding works under [contract reference] achieved practical completion on [date]: dismantle complete and final loads removed from site. We request release of the first half of retention, £[X], in the next payment. Please confirm the release and the defects expiry date so the balance can be diarised."
Retention is held on trust where the contract so provides. Where it does not, contractor insolvency may put retention at risk.
On the NASC form, no retention clause means no retention. If an amendment adds one, that's a negotiation, not a formality. Rate, triggers, bond. Push on all three.
11. KPIs and Weekly Reporting
Five KPIs drive most scaffolding businesses. Watch them weekly at business level. On a single project, the first three usually tell the whole story.
- Labour productivity: m² erected per man-hour, actual against tender
- Equipment utilisation: % of fleet on hire
- Application accuracy: applied vs certified. A widening gap means the QS is discounting you and nobody is challenging it
- Variation throughput: open vs closed. A growing open list is unpriced risk
- Aged debt: % over 60 days
One more from the variation side worth knowing: capture rate, the value of agreed variations against the value of instructions issued. Below about 80%, changes are being done without agreement, and the §6 discipline is being skipped.
The weekly report
Five things. One page. Sent every Friday.
- Work completed this week (area, lift, bay count)
- Work planned for next week
- Instructions received, and whether each has been confirmed in writing
- Any access, design or programme issue causing delay
- Anything you need from the MC before next week
Short, factual, on time. A report that arrives every week builds credibility, and it doubles as your protection: if a delay was caused by late access or a late drawing, the weekly report sent at the time and kept on file is the contemporaneous record that says so. A thirty-page document produced when someone asks for one builds nothing.
A KPI is only useful if it changes a decision. Track five, read them weekly, act on the trend rather than the single week. And send the Friday report every Friday, especially the weeks when there is nothing dramatic to say.
12. Records: The Defensive Layer
Every scaffolding contract eventually generates one or more disputes. The party with the better records usually wins. Module 5 built the delay records. This is the full defensive file, kept on every job from day one:
- Site Instruction log: every verbal instruction confirmed the same day
- Drawing register: every revision, every issue date, every priced revision
- Programme markup: weekly progress against the contract programme
- Delay register: every event with cause, duration and financial impact
- Daywork sheets: signed, dated, copied to the QS within 7 days
- Application file: every application and every notice received
- Photographs: date-stamped, geo-tagged where possible
- Weather records: where relevant to EOT claims
The records you wish you had at adjudication are the records you should have started keeping on day one.
13. Cash Flow
Scaffolding is cash-hungry. Kit, labour, transport and consumables all need paying before the customer pays you. The gap is funded by you, and the application cycle is the pump that refills it. Three controls:
- Apply on time, every time (§8)
- Chase from day one of overdue, following the NASC CG20:20 escalation sequence
- Reserve the right to statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998 in your standard terms
A detailed escalation sequence for overdue debt, from internal credit control through to county court action.
"Application [number] for £[X] fell due for payment on [date] under clause 14.3 of the Subcontract. No pay-less notice was served. The sum is now overdue and interest accrues at 8% above the Bank of England base rate under clause 14.5. Please confirm payment by [date]."
Module 8 takes this to its conclusion: set-off and withholding, statutory interest in detail, suspension rights, adjudication and the full debt recovery ladder. This module's job is to make sure you rarely need any of it: the application went in on the date, the notices were watched, and the chase started the day the money went overdue.
Cash flow problems are usually application problems six weeks earlier. Fix the discipline, not the overdraft.
Action Checklist
- Run a weekly CVR on every project over a stated value
- Track labour, materials, plant, daywork and variations daily on every project
- Reconcile daily actuals against tender allowances (man-hours, tonnage, hire spend) every week
- Use a Site Instruction log to confirm every verbal instruction the same day
- Price every variation before mobilising on it, and get the agreement in writing
- Submit daywork sheets to the QS within 7 days, signed by an authorised representative at end of shift
- Diary every application date and pay-less notice deadline for the life of the job
- Apply for the full measure every month; reconcile applied vs certified and challenge gaps in writing
- Measure Schedule of Rates work on the day, with the height-band uplift, against the drawing revision in force
- Issue a written retention release request on the day of practical completion; diary the second half against defects expiry
- Challenge any retention above 5%, and any retention clause added to the NASC standard form
- Send the five-point weekly report every Friday and review the five KPIs against the trend
Case Study: The Job That Looks Fine
Month 4 of a 6-month £400k contract with ABC Construction. The gangs are working well, the site team is happy, there are no arguments on site. You run CVR monthly, and this month's numbers say cost to date £180k, value to date £165k, forecast cost-to-complete £140k, forecast value-to-complete £155k, three open variations totalling £35k with none valued, daywork sheets signed but not yet in any application, and the last application £40k under-applied against the QS's own measure. Your contracts manager says the job is "fine". Five decisions ahead.
Downloads
Cost control templates. Coming soon.
Module 7 Quiz
10 questions. Pass mark is 80% (8 out of 10 correct).
Complete.
You can tell cost reporting from cost control, run an honest CVR, track the five daily cost categories against your tender, capture variations and daywork inside their deadlines, build applications that meet the Construction Act, manage retention and keep the records that win disputes. Module 8 picks up risk, delays and payment rights: your defence layer when the money stops.
- Module 8: Risk, Delays and Payment Rights
References
Harvard-style referencing applies throughout the course.
NASC Commercial Guidance
- NASC (2009) CG18:09 Daywork. London: National Access and Scaffolding Confederation.
- NASC (2022) CG9:22 Payment Under the Construction Act. London: National Access and Scaffolding Confederation.
- NASC (2022) CG11:22 Preparation of Schedule of Rates. London: National Access and Scaffolding Confederation.
- NASC (2019) CG12:19 Contract Clauses. London: National Access and Scaffolding Confederation.
- NASC (2020) CG20:20 A Guide to Monitoring and Chasing Debt. London: National Access and Scaffolding Confederation.
Standard Forms of Contract
- Construction Industry Publications Ltd (2018) Scaffolding Contract 2018: Form of Contract for the Erection, Hire and Dismantling of Scaffolding. Birmingham: Construction Industry Publications Ltd.
- Joint Contracts Tribunal (2016) Standard Building Sub-Contract Conditions (SBCSub/C 2016). London: Sweet and Maxwell.
- NEC (2013) NEC3 Engineering and Construction Subcontract (ECS). London: Institution of Civil Engineers.
RICS
- RICS (2nd edn) New Rules of Measurement (NRM2). London: Royal Institution of Chartered Surveyors.
- RICS (current edn) Definition of Prime Cost of Daywork. London: Royal Institution of Chartered Surveyors.
- RICS (Black Book current edn) Cost Reporting and Variations. London: Royal Institution of Chartered Surveyors.
CIOB
- Chartered Institute of Building (2022) Code of Practice for Project Management for the Built Environment. 5th edn. Chichester: Wiley-Blackwell.
- Chartered Institute of Building (current edn) Code of Estimating Practice. 8th edn. Bracknell: CIOB.
Industry Reports and Research
- Institution of Civil Engineers (n.d.) Common Causes of Low Productivity in Construction. Available at: ice.org.uk.
- Tokio Marine HCC (2024) Trade Credit UK Construction Sector Report 2024. Available at: tmhcc.com.
Legislation
- Housing Grants, Construction and Regeneration Act 1996, c. 53. London: HMSO.
- Local Democracy, Economic Development and Construction Act 2009, c. 20, Part 8. London: TSO.
- Late Payment of Commercial Debts (Interest) Act 1998, c. 20. London: HMSO.
Case Law
- Bath and North East Somerset DC v Mowlem plc [2004] EWCA Civ 115.
- S&T (UK) Ltd v Grove Developments Ltd [2018] EWCA Civ 2448.