{
  "query": "NEC4 Option X1 and X2 explanation construction contract UK",
  "raw_results": [
    {
      "url": "https://sypro.co.uk/blogs/understanding-secondary-options-in-nec4-ecc",
      "title": "Understanding Secondary Options in NEC4 ECC",
      "content": "### X1 Price adjustment for inflation\n\nCommercial  \n Risk to the Client  \n Used with Options A, B, C, and D.\n\nThis clause allows contract prices to adjust in line with inflation indices. It protects both parties from unpredictable cost increases and is often used in long-term contracts or in sectors with volatile material prices such as energy or infrastructure.\n\n### X2 Changes in the law\n\nLegal  \n Risk to the Client\n\nX2 allows for compensation events if a change in law affects the Contractor’s work, time or cost. It provides a fair mechanism to adjust the contract, reducing the need for Contractors to price for unknown legal risks. [...] These clauses can be grouped into four main categories:\n\n1. Commercial\n2. Legal\n3. Insurance\n4. Climate change\n\nIf you’re preparing an ECC, an essential guidance resource is Volume 2, which includes detailed examples on how to complete contract data and select the right secondary Options.\n\nWhen it comes to day-to-day contract management, contract management systems like Sypro  digitise your NEC contract. They allow you to track progress, stay compliant with alerts and monitor early warnings in real time, helping you avoid disputes and make informed decisions confidently.\n\nLet’s explore some of Dr Stuart Kings’ insights into these often-misunderstood secondary Options.\n\n## Detailed overview of NEC4 secondary Options\n\n### X1 Price adjustment for inflation [...] X16 enables the Client to hold back a percentage of payments until the work is completed to the required standard. This encourages the Contractor to rectify defects promptly and fully complete works. Another Option that is either in or out; retention is gradually released, often in stages.\n\n### X17 – Low Performance Damages\n\nCommercial\n\nX17 allows the Client to apply financial penalties if the Contractor fails to meet specified performance levels during or after completion, for example, if a building doesn’t meet agreed energy efficiency or operational standards. These damages are separate from delay damages (X7) and must relate to clearly defined performance criteria in the Scope.\n\n### X18 – Limitation of Liability\n\nLegal  \n Commercial  \n Risk to the Client and Contractor",
      "score": 0.8585411,
      "raw_content": null
    },
    {
      "url": "https://danielcms.co.uk/publications/news-blog/91-nec4-ecc-secondary-x-options",
      "title": "NEC4 ECC Secondary X Options - Daniel CMS",
      "content": "Secondary Option X1: Price Adjustment for Inflation\n\nOption X1 allows the risk of inflation to be managed using a defined index to adjust prices. The inclusion of X1 shifts most of the risk of inflation from the contractor to the client. It helps with managing the risk of inflation in long-term contracts or those in volatile economic environments.  X1 is not compatible with the cost reimbursable contracts (Options E and F),  because these contracts inherently adjust what the contractor is paid based on actual cost incurred.\n\nSecondary Option X2: Changes in the law [...] Email: davidhunter@danielcms.co.uk\n\n\n\n Home  \n Publications   \n Articles  \n NEC4 ECC Secondary X Options\n\n## NEC4 ECC Secondary X Options\n\nSecondary X Options is a key part of the NEC4 flexibility. The options allow the parties to tailor their contract to suit project-specific needs and allocation of risk.  They introduce additional procedures or obligations, covering areas such as collaboration, early completion, key performance indicators and whole-life costs. This article, provides a summary of the secondary X options that are available under the NEC4 Engineering and Construction Contract.\n\nSecondary Option X1: Price Adjustment for Inflation [...] Secondary Option X2: Changes in the law\n\nUnder Option X2 a change in the law of the country of the site occurs after the date the parties entered into the contract is treated as a compensation event. The ‘law’ in this context refers broadly to acts of parliament (statutes) and delegated legislation (statutory instruments).\n\nSecondary Option X3: Multiple Currencies",
      "score": 0.85421735,
      "raw_content": null
    },
    {
      "url": "https://www.neccontract.com/news/managing-inflation-risk-in-nec4-and-the-effect-on-compensation-events",
      "title": "Managing inflation risk in NEC4 and the effect on compensation ...",
      "content": "If the client decides to take all the risk for inflation, then secondary option X1 can be used in the majority of NEC4 forms (see also Patterson (2022) in Issue 118). This secondary option can be selected with Options A, B, C and D, although not under E or F as reimbursement of defined cost under these is at real-time prices.  \n  \nIf using option X1 under Options A and B, a contractor’s interim payments are adjusted for inflation by calculating the ‘Price Adjustment Factor’ (PAF) using the formula (L-B)/B for each of the elements that has an index, where L is the ‘Latest Index’ and B is the ‘Base Date Index’. This percentage figure is factored against the calculated amount of price for work done to date in the interim payment. [...] NEC4 Engineering and Construction Contract (ECC) Options A and B are priced contracts meaning, absent any changes to or breaches of contract during the works, the contract comprising the activities or measure must be delivered at the agreed price or rate. Under these options, the price risk for procuring and delivering the activity or unit of work is owned by the contractor. [...] While inflation is not a compensation event, several types of delay event or other changes can lead to recovery. Recent examples can include events such as Brexit, where changes in the law (option X2) led to changes in the availability of resources which, in turn, led to changes in defined cost. In contracts excluding option X1, a compensation event under option X2 could include the effects of changes in the defined cost of carrying out the works. The impacts of any inflation are, therefore, included within the quotation for the event.",
      "score": 0.7366474,
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    },
    {
      "url": "http://tfw.wales/sites/default/files/2025-11/NEC4-ECC-Option-A-Build-Only-Non-CVL-Complete-V2.0-Clean.pdf",
      "title": "[PDF] NEC4 Engineering and Construction Contract – Option A - TfW",
      "content": "to the index for ……………….. 0………………………………linked to the index for ……………….. 0………………………………linked to the index for ……………….. 0………………………………non- adjustable……………………… The base date for indices is ……………………………………….. The indices are ……………………………………………………… X5: Sectional Completion The completion date for each section of the works is section description completion date [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] X7: Delay damages (If Option X7 is used without Option X5) Delay damage for Completion of the whole of the works are £[ ] per day (If Option X7 is used with Option X5) • Delay damages for each section of the works are section description amount per day [ ] [ ] £[ ] [ ] [ ] £[ ] [ ] [ ] £[ ] X8: Undertakings to the Client or Others If Option X8 is used The undertakings to Others are provided to [...] \"Other than any payment which may become due under clause 93, the Client shall not be liable to the Contractor for any costs, expenses, disbursements or losses (including any indirect or consequential losses, such as loss of profit) which may arise as a result of the termination of the contract. Save as aforesaid, any termination of the Contractor's engagement under this contract is without prejudice to the Parties' rights and remedies accrued up to the date of termination, which shall survive such termination\" Z.38 Option W2 Z.38.1 Delete the second sentence of clause W2.4(2) and replace with: \"The dispute may not be referred to the tribunal unless this notification is given within eight weeks of being informed of the Adjudicator's decision\" Z.39 Secondary Option X14 Z.39.1 Delete the [...] are [ ] [DN – review on a project by project basis – adjacent property insurance and/or existing building insurance may be appropriate] Resolving and avoiding disputes The tribunal is litigation in the Courts of England and Wales The Senior Representatives of the Client are Name (1) [ ] Address for communications [ ] Address for electronic communications [ ] Name (2) [ ] Address for communications [ ] Address for electronic communications [ ] The Adjudicator is to be nominated by the Adjudicator nominating body The Adjudicator nominating body is TECBAR X1: Price adjustment for inflation If Option X1 is used The proportions used to calculate the Price Adjustment Factor are 0. …………………………….linked to the index for ……………….. 0……………………………...linked to the index for ……………….. 0………………………………linked to",
      "score": 0.7216064,
      "raw_content": null
    },
    {
      "url": "https://www.apm.org.uk/media/kjzotx4v/nec-contracts-questions-answered.pdf",
      "title": "NEC contracts: An introduction - why are they so different?",
      "content": "Housing Grants, Construction and Regeneration Act 1996 does not apply SECONDARY OPTIONS Any combination other than those stated may be used. Option X1 Price adjustment for inflation (used only with Options A, B, C and D) Option X2 Changes in the law Option X3 Multiple currencies (used only with Options A and B) Option X4 Ultimate holding company guarantee Option X5 Sectional Completion Option X6 Bonus for early Completion Option X7 Delay damages Option X8 Undertakings to the Client or Others Option X9 Transfer of rights Option X10 Information modelling Option X11 Termination by the Client Option X12 Multiparty collaboration (not used with Option X20) Option X13 Performance bond Option X14 Advanced payment to the Contractor Option X15 The Contractor’s design Option X16 Retention (not used",
      "score": 0.66621506,
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    }
  ],
  "formatted": "Source: Understanding Secondary Options in NEC4 ECC\nURL: https://sypro.co.uk/blogs/understanding-secondary-options-in-nec4-ecc\n### X1 Price adjustment for inflation Commercial Risk to the Client Used with Options A, B, C, and D. This clause allows contract prices to adjust in line with inflation indices. It protects both parties from unpredictable cost increases and is often used in long-term contracts or in sectors with volatile material prices such as energy or infrastructure. ### X2 Changes in the law Legal Risk to the Client X2 allows for compensation events if a change in law affects the Contractor’s work, time or cost. It provides a fair mechanism to adjust the contract, reducing the need for Contractors to price for unknown legal risks. [...] These clauses can be grouped into four main categories: 1. Commercial 2. Legal 3. Insurance 4. Climate change If you’re preparing an ECC, an essential guidance resource is Volume 2, which includes detailed examples on how to complete contract data and select the right secondary Options. When it comes to day-to-day contract management, contract management systems like Sypro digitise your NEC contract. They allow you to track progress, stay compliant with alerts and monitor early warnings in real time, helping you avoid disputes and make informed decisions confidently. Let’s explore some of Dr Stuart Kings’ insights into these often-misunderstood secondary Options. ## Detailed overview of NEC4 secondary Options ### X1 Price adjustment for inflation [...] X16 enables the Client to hold back a percentage of payments until the work is completed to the required standard. This encourages the Contractor to rectify defects promptly and fully complete works. Another Option that is either in or out; retention is gradually released, often in stages. ### X17 – Low Performance Damages Commercial X17 allows the Client to apply financial penalties if the Contractor\n\n---\n\nSource: NEC4 ECC Secondary X Options - Daniel CMS\nURL: https://danielcms.co.uk/publications/news-blog/91-nec4-ecc-secondary-x-options\nSecondary Option X1: Price Adjustment for Inflation Option X1 allows the risk of inflation to be managed using a defined index to adjust prices. The inclusion of X1 shifts most of the risk of inflation from the contractor to the client. It helps with managing the risk of inflation in long-term contracts or those in volatile economic environments. X1 is not compatible with the cost reimbursable contracts (Options E and F), because these contracts inherently adjust what the contractor is paid based on actual cost incurred. Secondary Option X2: Changes in the law [...] Email: davidhunter@danielcms.co.uk Home Publications Articles NEC4 ECC Secondary X Options ## NEC4 ECC Secondary X Options Secondary X Options is a key part of the NEC4 flexibility. The options allow the parties to tailor their contract to suit project-specific needs and allocation of risk. They introduce additional procedures or obligations, covering areas such as collaboration, early completion, key performance indicators and whole-life costs. This article, provides a summary of the secondary X options that are available under the NEC4 Engineering and Construction Contract. Secondary Option X1: Price Adjustment for Inflation [...] Secondary Option X2: Changes in the law Under Option X2 a change in the law of the country of the site occurs after the date the parties entered into the contract is treated as a compensation event. The ‘law’ in this context refers broadly to acts of parliament (statutes) and delegated legislation (statutory instruments). Secondary Option X3: Multiple Currencies\n\n---\n\nSource: Managing inflation risk in NEC4 and the effect on compensation ...\nURL: https://www.neccontract.com/news/managing-inflation-risk-in-nec4-and-the-effect-on-compensation-events\nIf the client decides to take all the risk for inflation, then secondary option X1 can be used in the majority of NEC4 forms (see also Patterson (2022) in Issue 118). This secondary option can be selected with Options A, B, C and D, although not under E or F as reimbursement of defined cost under these is at real-time prices. If using option X1 under Options A and B, a contractor’s interim payments are adjusted for inflation by calculating the ‘Price Adjustment Factor’ (PAF) using the formula (L-B)/B for each of the elements that has an index, where L is the ‘Latest Index’ and B is the ‘Base Date Index’. This percentage figure is factored against the calculated amount of price for work done to date in the interim payment. [...] NEC4 Engineering and Construction Contract (ECC) Options A and B are priced contracts meaning, absent any changes to or breaches of contract during the works, the contract comprising the activities or measure must be delivered at the agreed price or rate. Under these options, the price risk for procuring and delivering the activity or unit of work is owned by the contractor. [...] While inflation is not a compensation event, several types of delay event or other changes can lead to recovery. Recent examples can include events such as Brexit, where changes in the law (option X2) led to changes in the availability of resources which, in turn, led to changes in defined cost. In contracts excluding option X1, a compensation event under option X2 could include the effects of changes in the defined cost of carrying out the works. The impacts of any inflation are, therefore, included within the quotation for the event.\n\n---\n\nSource: [PDF] NEC4 Engineering and Construction Contract – Option A - TfW\nURL: http://tfw.wales/sites/default/files/2025-11/NEC4-ECC-Option-A-Build-Only-Non-CVL-Complete-V2.0-Clean.pdf\nto the index for ……………….. 0………………………………linked to the index for ……………….. 0………………………………linked to the index for ……………….. 0………………………………non- adjustable……………………… The base date for indices is ……………………………………….. The indices are ……………………………………………………… X5: Sectional Completion The completion date for each section of the works is section description completion date [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] X7: Delay damages (If Option X7 is used without Option X5) Delay damage for Completion of the whole of the works are £[ ] per day (If Option X7 is used with Option X5) • Delay damages for each section of the works are section description amount per day [ ] [ ] £[ ] [ ] [ ] £[ ] [ ] [ ] £[ ] X8: Undertakings to the Client or Others If Option X8 is used The undertakings to Others are provided to [...] \"Other than any payment which may become due under clause 93, the Client shall not be liable to the Contractor for any costs, expenses, disbursements or losses (including any indirect or consequential losses, such as loss of profit) which may arise as a result of the termination of the contract. Save as aforesaid, any termination of the Contractor's engagement under this contract is without prejudice to the Parties' rights and remedies accrued up to the date of termination, which shall survive such termination\" Z.38 Option W2 Z.38.1 Delete the second sentence of clause W2.4(2) and replace with: \"The dispute may not be referred to the tribunal unless this notification is given within eight weeks of being informed of the Adjudicator's decision\" Z.39 Secondary Option X14 Z.39.1 Delete the [...] are [ ] [DN – review on a project by project basis – adjacent property insurance and/or existing building insurance may be appropriate] Resolving and avoiding disputes The tribunal is litigation in the C\n\n---\n\nSource: NEC contracts: An introduction - why are they so different?\nURL: https://www.apm.org.uk/media/kjzotx4v/nec-contracts-questions-answered.pdf\nHousing Grants, Construction and Regeneration Act 1996 does not apply SECONDARY OPTIONS Any combination other than those stated may be used. Option X1 Price adjustment for inflation (used only with Options A, B, C and D) Option X2 Changes in the law Option X3 Multiple currencies (used only with Options A and B) Option X4 Ultimate holding company guarantee Option X5 Sectional Completion Option X6 Bonus for early Completion Option X7 Delay damages Option X8 Undertakings to the Client or Others Option X9 Transfer of rights Option X10 Information modelling Option X11 Termination by the Client Option X12 Multiparty collaboration (not used with Option X20) Option X13 Performance bond Option X14 Advanced payment to the Contractor Option X15 The Contractor’s design Option X16 Retention (not used"
}