Guides, tools and checks

Resources

Practical guides on construction variations, claims and contracts - written for QSs, commercial managers and contractors.

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Free recovery check for UK subcontractors

Send one live job and get a report in pounds within two working days: variations priced and not agreed, work done without a written instruction, notices at risk, and what to send this week.

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Variation ROI calculator

Your turnover, your assumptions: what unrecovered variations cost you a year, and what recovering more of them is worth against the price of the plan.

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Product guides

How to use VariationFlow, step by step

20 short guides to every part of the product: capturing on site, pricing and submitting, contract deadlines, valuations, CVR, domestic jobs, QA Flow and Xero.

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Articles

10 October 2026

What to look for in NEC and JCT variation software: ten questions to ask before you buy

A buyer’s checklist for UK specialist subcontractors choosing variation management software for NEC4 and JCT work: subcontract periods rather than main contract ones, Z clauses, Construction Act day counting, which side of the payment notice the tool serves, capture on site without signal, getting the instruction in writing, chasing, evidence, exporting your data and price.

10 October 2026

Unpaid variations (change orders) in the UK: the complete guide for subcontractors

How UK specialist subcontractors get variations paid, from the instruction to the final account: what counts as a variation (a change order in American terms), notifying inside the NEC4 subcontract and JCT time limits, pricing and submitting, the Construction Act payment and pay less notices, interest, suspension and adjudication when it is not paid, and the records that decide it.

3 October 2026

Why variations go unpaid, and why the leak lands hardest on specialist subcontractors

Why variations go unpaid on UK construction jobs, explained for specialist subcontractors: an illustrative anatomy of a lost variation under the NEC4 subcontract’s clause 61.3 time bar, the five process failures behind the loss, what research by FIS and the University of Reading shows about the sector, and why insolvency and late payment make it matter more than ever.

3 October 2026

Forecasting the final account: building the monthly CVR, and reading over- and under-recovery before the money has gone

How a UK specialist subcontractor’s QS or commercial manager forecasts the final account month by month: building the CVR from cost heads, accruals, work in progress and provisions, setting the forecast final value and cost, reading over- and under-recovery head by head, and the traps that flatter a margin, starting with unagreed variations counted at the value submitted.

29 September 2026

What is practical completion? What the certificate means, what changes on the day, and why your completion and the project’s are different dates

A plain-English guide to practical completion for UK subcontractors: what it means and the test the courts apply, who certifies it under JCT and NEC, what changes on the day (retention, the rectification period, delay damages, the final account clocks), sectional completion and partial possession, and why a sub-contract that keys your dates to the main contract’s completion is worth reading twice.

28 September 2026

The free recovery check: send us one live job and get back what it is still owed, in pounds

VariationFlow now offers UK subcontractors a free recovery check. You send the variation schedule, the instructions and the payment applications for one live job; within two working days you get a report in pounds of what is priced and not agreed, what was done without a written instruction, which notices and payment dates are at risk, and what to send this week, with a 20-minute call to go through it. This is what it covers, what to send, and what it is not.

28 September 2026

What is a CVR? The monthly cost value reconciliation, why it measures margin rather than cash, and where the money it cannot see goes

A plain-English guide to the cost value reconciliation for subcontractors: what a CVR is, the value side (certified, applied, work in progress, adjustments), the cost side (cost to date by head, accruals, provisions), how margin and the out-turn forecast fall out of it, why a cash-positive job can be losing money, the monthly discipline, and the one leak a CVR cannot show you.

27 September 2026

What is an Interim Valuation Date? The JCT 2016 date that every payment deadline hangs on, and why it can fall earlier than the calendar says

A plain-English guide to the Interim Valuation Date under the JCT 2016 and 2024 forms for UK subcontractors: what it is, where it is fixed, how the due date, payment notice, final date and pay less notice all count from it, why the sub-contract’s period is not the main contract’s, the “nearest, not next, Business Day” rule that can pull a cycle forward, and why the cycle continues after practical completion.

26 September 2026

What is a Z clause? The NEC4 amendments that shorten your notice periods, where to find them, and the one number to write down

A plain-English guide to Z clauses for subcontractors on NEC4 contracts: what Option Z is, why the client writes them, where they sit in the Contract Data, what they most often change, why the compensation event notification period is the one to check first, and how to run a job against the amended periods rather than the printed ones.

25 September 2026

How days are counted on a construction payment cycle: calendar days, section 116, the Saturday deadline and the bank holidays that move

How the Construction Act reckons the days on a payment cycle for UK subcontractors: section 116 and what it excludes, why weekends count and a pay less deadline can fall on a Saturday, why a bank holiday inside a period adds a day, which region’s holidays apply, the one-off holidays no rule predicts, the JCT reckoning clause, and the different mechanism in Northern Ireland.

24 September 2026

What is the notified sum? The one number the Construction Act says must be paid, and how it comes to be yours

A plain-English guide to the notified sum under the Construction Act for UK subcontractors: how the sum is fixed by the payer’s payment notice, how the payee’s own application takes its place when the payer says nothing, what a pay less notice can and cannot do to it, why retention comes off before it and not after, and what “pay now, argue later” means in practice.

23 September 2026

What is a contra-charge? The deduction, the basis it has to show, and the two questions to ask the same day

A plain-English guide to contra-charges for UK subcontractors: what a contra-charge is, the two things a payer needs before it can deduct one (a right to deduct and a compliant notice), what section 111 says a pay less notice must show, why a one-line deduction is a position and not a bill, and how to answer one without losing the relationship.

22 September 2026

What is a daywork sheet? The record that turns extra hours into money, and why an unsigned one is only your word

A plain-English guide to daywork sheets for UK subcontractors: what a daywork sheet is and is not, what goes on one, who signs it and what the signature means, when JCT wants the voucher in and what NEC does instead, how dayworks are valued, and the Friday-to-Wednesday routine that gets sheets signed.

20 September 2026

Construction payment in Northern Ireland: the same numbers, a different Act, and a way of counting days that runs the opposite way

Why the Construction Act does not apply in Northern Ireland, what the Construction Contracts (Northern Ireland) Order 1997 does instead, why every payment period is identical to Great Britain’s, and the one thing that is not: section 39 of the Interpretation Act (Northern Ireland) 1954 rolls a deadline off a Sunday or public holiday where section 116 excludes holidays from the count, which moves real dates on real jobs.

18 September 2026

Interest on a late construction payment: the rate everyone gets wrong, the fixed sum you are owed on top, and the costs limb almost nobody claims

Statutory interest on late payment for UK construction firms: how the Late Payment of Commercial Debts (Interest) Act 1998 works, why the rate is fixed at the half-year reference date and not the base rate on the day, the £40, £70 and £100 fixed sums under section 5A, the further limb that lets you recover recovery costs above the fixed sum, when a contractual interest clause displaces the Act, and how to put it in a letter without wrecking the relationship.

11 September 2026

Downing tools lawfully: the section 112 right to suspend for non-payment, and the two halves of it nobody uses

The statutory right to suspend performance for non-payment under section 112 of the Construction Act, explained for UK subcontractors: when it arises, the seven days’ notice and what has to be in it, why you can now suspend part of the work rather than all of it, the costs of suspending and remobilising that the payer must pay, why the time you lose comes back off your programme, when the right ends, and the mistakes that turn a lawful suspension into a repudiation.

7 September 2026

Adjudication for subcontractors: the 28-day clock, what it costs and how the decision gets enforced

The construction adjudication process explained for UK subcontractors: the right to refer under section 108, the seven-day appointment and referral, the 28-day decision and who can extend it, what the adjudicator can decide, what it costs and who pays, how a decision is enforced in court, and when adjudication is the wrong tool.

7 September 2026

NEC4 compensation events: the list, the notification bar, quotations and deemed acceptance

NEC4 compensation events explained for subcontractors on the Engineering and Construction Subcontract: what counts under clause 60.1, who notifies and the clause 61.3 bar (notify within seven weeks of becoming aware, often less where Z clauses shorten it), a quotation due within two weeks of being instructed and the Contractor’s four weeks to reply under clause 62.3, deemed acceptance after a further three weeks under clause 62.6 and how to make it bite, when the Contractor assesses instead, what a missed early warning costs, and why the main contract’s periods are not yours.

7 September 2026

Closing a final account: the evidence, the deductions that appear at the end of every job, and the order to negotiate in

The final account in construction, explained for UK subcontractors: what it is under JCT and NEC4, what has to be in it before it goes in, the deductions that turn up at final account and the answer to each, how the Construction Act still governs the final payment, the order to negotiate in, what full and final settlement actually settles, how long you have, and the records that decide it.

27 July 2026

Construction Act payment rules: the regime end to end

The Construction Act payment rules explained for UK subcontractors: how the due date, payment notice, pay less notice and final date fit together, what the Scheme fills in when the contract is silent, why pay-when-paid is banned, and the right to suspend for non-payment.

24 July 2026

Payment applications that stand up: how to make the application that becomes the notified sum

A plain-English guide to payment applications for UK subcontractors: what makes an application for payment valid, how a clean application becomes the notified sum when the payer’s notices don’t arrive, what the courts look for, and the monthly habits that make every application count.

23 July 2026

Smash-and-grab adjudication: when a missed notice means they owe the lot

A plain-English guide to smash and grab adjudication for UK subcontractors: how a missed payment or pay less notice makes the notified sum payable in full, what the adjudicator actually decides, what S&T v Grove said about paying first, when to fire one, and when not to.

21 July 2026

Verbal instructions in construction: binding or not, and how to get paid for them

A plain-English guide to verbal site instructions for UK subcontractors: whether an oral instruction is binding, what JCT and NEC4 actually require, how to confirm a verbal instruction (CVI) so it sticks, what the Supreme Court said about "no oral modification" clauses, and the on-site habits that turn "we’ll square it up later" into money.

21 July 2026

Retention in construction: how it works, when it must be released, and how to get it back

A plain-English guide to retention for UK subcontractors: what retention is, the usual 5% and 2.5% figures, when the two halves must be released, the Construction Act rules on release tied to another contract, why retention quietly disappears, and a practical playbook for recovering it, including old retention you wrote off.

21 July 2026

Charging for extras on domestic jobs: getting paid for "while you’re here" work

A plain-English guide for builders on charging for extras on domestic work, extensions, lofts, refurbs: why extras go unpaid, what the Consumer Rights Act says when no price was agreed, the 14-day cancellation rule for work agreed in the client’s home, and the habits that stop the final bill becoming a fight.

14 July 2026

What is the golden thread in construction? The Building Safety Act duty, explained

A plain-English guide to the golden thread for UK contractors and subcontractors: what the Building Safety Act 2022 requires, which buildings count as higher-risk, how the gateway regime works, what information the thread must hold, and what main contractors now demand from their supply chain.

13 July 2026

Pay less notices explained: s.111, deadlines, and what to do when one lands

A plain-English guide to pay less notices under the Construction Act for UK subcontractors: what section 111 requires, when a pay less notice must be served, what makes one invalid, the “smash and grab” adjudication that follows a missed notice, and how to protect your applications.

7 July 2026

What is an NCR? The non-conformance report process, explained

A plain-English guide to non-conformance reports for subcontractors: what an NCR is, the full lifecycle from raised to verified, the four dispositions (rework, repair, use-as-is, reject), how concessions work, and what a defensible NCR record looks like at handover.

6 July 2026

Hold points vs witness points: what’s the difference?

Hold points and witness points both invite inspection, but only one stops the work. A clear guide for subcontractors: the difference, the S/H/W/R notation, notice periods, what happens if you build past a hold point, and how to manage them without holding up the programme.

6 July 2026

How to write an ITP (Inspection & Test Plan)

A practical guide to building an Inspection and Test Plan for a subcontract package: the anatomy of an ITP, how to sequence checkpoints, writing acceptance criteria, choosing hold, witness, surveillance and review points, and a worked example.

5 July 2026

What goes in an O&M manual and handover pack?

What the operation and maintenance manual and quality handover pack must contain at the end of a construction project, as-builts, test certificates, signed ITPs, closed NCRs, warranties and material approvals, and why assembling it as you go beats the end-of-job scramble.

4 July 2026

ITPs, RAMS and NCRs: construction quality paperwork, explained

A plain-English guide to site quality documentation for subcontractors: what ITPs and QITPs are, how hold and witness points work, what RAMS must cover and who signs them, the NCR lifecycle, and why digital quality records get handovers signed off faster.

17 June 2026

What is a variation in construction?

A plain-English guide to construction variations: what counts as a variation, how they work under JCT and NEC contracts, the instruction-to-payment process, and why they so often go unpaid.

16 June 2026

Variation vs claim: what's the difference in construction?

Variations and claims are often confused, but they are not the same thing. Here's how they differ under JCT and NEC contracts, and why getting the distinction right protects your entitlement.

15 June 2026

How to value a construction variation

How construction variations are valued under JCT and NEC contracts, contract rates, fair rates, daywork and forecast cost, plus the records you need to get paid the right amount.

14 June 2026

JCT variations vs NEC compensation events

JCT and NEC handle change in fundamentally different ways. A side-by-side guide to variations under JCT versus compensation events under NEC3/NEC4, terminology, process, valuation and timescales.

13 June 2026

Extension of time vs variation: what's the difference?

Variations and extensions of time are related but distinct. How instructed change (variations) connects to time entitlement (EOT) under JCT and NEC, and why one does not automatically grant the other.