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Design liability meaning

What does Design liability mean?
In practice, design liability describes who bears legal responsibility for the adequacy and regulatory compliance of a project’s design, for all or part of the design scope. It is not a defined statutory term but a descriptive expression used across construction projects and disputes in the UK and Ireland. The liability of architects, engineers and design-and-build contractors arises under contract (professional appointments, building contracts, collateral warranties/third-party rights), in tort/delict, and under statute. The standard of care is central. Consultants typically owe reasonable skill and care. An express fitness-for-purpose obligation—common in design-and-build—imposes a higher risk and may not be covered by professional indemnity insurance. Duties include meeting the employer’s requirements, standards and building regulations; approvals by others rarely shift responsibility. Limitation/prescription varies: in England and Wales, extended periods apply to certain residential defects (for example under the Building Safety Act 2022 and Defective Premises Act 1972); Scotland applies prescription rules to delictual and contractual claims; Northern Ireland broadly mirrors England and Wales; Ireland applies the Statute of Limitations 1957 and case law on when damage accrues. Design liability often involves multiple responsible parties; contribution and apportionment govern their shares. Allocation is commonly managed through express clauses, caps, exclusions and collateral warranties.
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View the related Checklists about Design liability

CHECKLISTS
Property purchase due diligence: post-completion review checklist for construction contracts, consultant appointments, collateral warranties, third-party rights, reports and guarantees (England and Wales)

This Checklist outlines the principal contractual points within a bundle of construction documents that a construction lawyer should review and report on for a prospective buyer of a property or development. It should be read alongside: Construction due diligence for property purchase-initial review of construction package-checklist. After reviewing the documents and raising enquiries, the purchaser’s construction lawyer will also need to produce a report on the construction documents, see Precedent: Report on construction documentation. The issues below proceed on the basis that construction at the relevant property has been completed. Accordingly, there is no need to scrutinise terms governing the running of the contract during the build, such as payment provisions; these are only relevant where a buyer is acquiring while works are ongoing and step-in rights are being offered. Building contracts Identity of contractor – Confirm the contractor continues to exist and carry out a financial check (for example via Dun & Bradstreet) to ensure it is financially sound. Date of contract –...

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CHECKLISTS
Contractor checklist for drafting binding construction letters of intent: scope, programme, incorporated documents, payment terms and caps, design liability, sub-contracts, site works/CDM, termination, copyright and boilerplate

A letter of intent (LOI) can be put in place before the formal agreement and signing of a building contract (or sub‑contract) so that certain design tasks and/or works may commence at an early stage as necessary and appropriate. This Checklist outlines the principal points a contractor should weigh and the drafting it ought to seek, or ask to be inserted, to secure a clear, binding letter of intent on a construction project. Although the terms ‘contractor’ and ‘employer’ are used, the same principles also apply to dealings between a contractor and a sub‑contractor. When negotiating or preparing a letter of intent, not every point listed below will be pertinent; users must assess each matter against the particular circumstances. See Practice Note: Letters of intent—construction for further guidance on letters of intent. Key issues and clauses Are the parties’ particulars fully and accurately recorded? Make sure the employer’s and contractor’s full details are set out at the start of the letter of intent (including full company...

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CHECKLISTS
Pre-construction services agreements: key drafting issues and checklist, including two-stage tendering, design liability, Building Safety Act Gateway 2, HGCRA payment compliance, insurance, collateral warranties, assignment, termination and adjudication

This checklist identifies the principal points to bear in mind when preparing or assessing a pre-construction services agreement (PCSA). Remember that the content and scope of any PCSA will hinge on the services the contractor is to deliver and the expected length of the pre-construction phase. Consequently, the drafting may differ significantly. For further detail on PCSAs, see Practice Note: Pre-construction services agreements. PCSAs generally draw together aspects from several sources. Core terms are akin to those used in a letter of intent, but with added provisions to address liaising with other parties and preliminary works taking place on site. By contrast with a letter of intent, a PCSA is set out as a conventional legal agreement, with distinct sections for the parties and for recitals. A letter of intent A consultant’s appointment A building contract Key issues and clauses • Background A PCSA should include a recitals or background section that explains the basis for the appointment and the parties’...

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NEWS
Employment law weekly: ERA 2025 implementation, Welsh SCNB consultation, ET/EAT rule changes, EHRC single-sex guidance upheld, Guy Carpenter team move, HMRC car rates, EU CSRD/CS3D scope narrowed

In this issue: Employment Rights Act 2025 Benefits Protected characteristics Confidentiality, duties and restrictions: enforcement Europe-EU New and updated content Dates for your diary Trackers Employment resources on Lexis+® LexTalk®Employment: a Lexis®Nexis community Daily and weekly news alerts Employment Rights Act 2025 Welsh Government consults on establishment of a Social Care Negotiating Body The Welsh Government has opened a consultation on creating a Social Care Negotiating Body (SCNB) using powers in the Employment Rights Act 2025 (ERA 2025). The SCNB would be responsible for setting Fair Pay Agreements for Wales’s social care workforce. Feedback is invited on the organisation’s design, role and anticipated effects. Responses will inform the government’s understanding of sector perspectives on the SCNB, including the bargaining approach, who and what it should cover, dispute resolution, roll-out, as well as compliance and enforcement. The consultation closes on 28 April 2026. The exercise does not invite comments on the specifics...

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NEWS
UK commercial law: 2025 key developments and 2026 horizon: advertising, data/AI, consumer protection, contracts, product liability, supply chain compliance and cyber resilience

For further insight on forthcoming key developments, see Practice Note: Commercial—horizon scanner. For details of earlier developments relevant to commercial law and practice, consult the following Practice Notes: Commercial tracker Commercial tracker 2025 [Archived] Additional updates and commentary are available via our current awareness alerts and highlights. Click ‘Create Alert’ in your ‘Alerts’ tab and refine your personal settings to subscribe. Advertising, marketing and sponsorship Note—several shifts within the consumer protection landscape have influenced the regulation of advertising and marketing in 2025. These are discussed in the section: ‘Consumer protection’ below. What were the key developments in 2025? Advertising less healthy food and drinks In 2025, the much-anticipated framework governing promotion of less healthy food and drink moved from policy design to practical readiness for enforcement. The Health and Care Act 2022 (HCA 2022) received Royal Assent on 28 April 2022, introducing a 9 pm TV watershed for identifiable less healthy products and a restriction on paid‑for advertising...

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NEWS
UK Supreme Court in Lifestyle Equities v Ahmed: accessory IP liability requires knowledge; no joint account of profits; only personal gains recoverable; employees’ salaries excluded; loans not profits

Lifestyle Equities CV and Another v Ahmed and Another [2024] UKSC 17 What are the practical implications of this case? The Supreme Court has delivered its long‑awaited ruling on the appeal and cross‑appeals in Lifestyle Equities CV v Ahmed, proceeding from Lord Justice Birss’s judgment in the Court of Appeal [2021] EWCA Civ 675. Lord Leggatt wrote for the court, with Lords Kitchen, Lloyd‑Jones, Stephens and Richards agreeing. The judgment sets out a series of significant conclusions: Accessory liability (as a joint tortfeasor) in respect of a strict liability tort is not itself governed by the same strict standard. Conversely, an accessory must possess knowledge of the essential aspects of the tort to justify imposing joint liability on a person who has not themselves committed it. The identical test applies whether accessory liability is said to arise by procuring the tort or by participating in a common design with the primary tortfeasor. An account of profits sought from an accessory will therefore never...

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View the related Practice Notes about Design liability

PRACTICE NOTES
UK and EU private-sector supply chain sustainability: a practitioner’s guide to ESG due diligence, supplier codes, contractual controls and risk mitigation

Embedding sustainability This Practice Note considers supply chain sustainability through the wider lens of sustainable procurement and environmental, social and governance (ESG) performance, concentrating on leading themes in UK and EU private sector practice. It offers practical direction on setting up a supplier code of conduct and building a comprehensive supply chain sustainability programme that addresses: Human rights and labour standards Environmental impacts and deforestation Corruption and litigation exposure Risk management across the supply chain Public procurement sits outside the scope of this note. For further information on supply chain sustainability in the UK, including details on UK regulations, see Practice Note: Supply chain sustainability—UK. For further information on supply chain sustainability in the EU, including details on EU regulations, see Practice Note: Supply chain sustainability—EU. For further information on sustainable public procurement in the UK, see Practice Note: A guide to sustainable public procurement. Supply chain sustainability has moved from the margins to a central business priority. Although...

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PRACTICE NOTES
NEC3/NEC4 X options: overview of secondary options (X7 delay damages, X15 design liability, X16 retention, X18 limitation of liability, X29 climate change incentives)

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z X...

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PRACTICE NOTES
MF/2 Rev 2 (1999): IET/IMechE plant design-and-supply contract—scope, MF/1 comparison, payment, HGCRA issues, variations, claims, liability limits, defects, and disputes (arbitration; no adjudication)

MF/2 MF/2 sits within the IET and Institution of Mechanical Engineers’ suite of Model Forms. It is intended for domestic (UK) or international agreements dealing solely with the supply of electrical, electronic or mechanical plant, and its full name is MF/2 Model Form of General Conditions of Contract for use in connection with home or overseas contracts for the supply of electrical, electronic or mechanical plant. The core terms have remained unchanged since 1999, save for amendment slips addressing the Contracts (Rights of Third Parties) Act 1999 (C(RTP)A 1999) and proposals to align it with MF/1 revision 5. Depending on the contractor’s scope and site characteristics, MF/2 can amount to a contract for ‘construction operations’ and fall within the Housing Grants, Construction and Regeneration Act 1996 (HGCRA 1996). It contains no adjudication provision and its payment terms do not satisfy those statutory controls—such provisions would need to be added by adapting comparable wording from MF/1. See Practice Notes: What is a construction contract under the HGCRA 1996? ...

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PRECEDENTS
Comprehensive Amendments to SBCC 2016 Standard Building Contract (Without Quantities) for Scotland: Design Liability, Third-Party Agreements, Insurance, Bonds, Collateral Warranties, Payment, Retention, Fluctuations, Dispute Resolution and Insolvency

The Contract comprises the completed Standard Building Contract Without Quantities for use in Scotland 2016 published by the SBCC subject to the following amendments: Recitals and Articles updated: contractor to provide a master programme and Schedule of Information Requirements; CDP responsibility accepted; Principal Contractor duties priced; arbitration deleted; Schedule of Amendments prevails; Third Party Agreements duties. Contract Particulars: arbitration entries removed; Rectification Period set at 12 months; fluctuations and certain PII/guarantee entries deleted. Conditions: key definitions revised (Practical Completion, Copyright Material, Design sub‑contractors, Funder, Site); Scottish jurisdiction; approvals mean principles only; entire agreement; variations in writing. Design/materials/programming: contractor accepts ER/CP; quality and non‑deleterious materials; programme reporting; site risk; drawings/info supply; tighter discrepancy notices. Time/defects: mitigate and advise on delay; narrower Relevant Events; Practical Completion clarified; stronger rectification, consequential damage and indemnity; phased as‑built/occupation information. IP/confidentiality/BIM: broader licence, moral rights waivers and delivery; confidentiality reinforced; BIM where adopted. Management/sub‑contracting: access, approved Site Manager, meetings; prescribed sub‑contracts; collateral warranties/third‑party rights; CDM duties; insurance...

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PRECEDENTS
Product Safety Incident, Recall and Corrective Action Plan Template aligned with PAS 7100:2022 and GPSR 2005

1 Management commitment Person accountable for the Product Safety Incident Plan (PSIP) [ Insert name and contact details of senior person in the organisation responsible for leading, developing and periodically reviewing the policy, and reporting on its operation to the Board ] Plan Review Date [ Insert date of next plan review ] 1.1 [ Insert organisation name ] aims to ensure every product it [ produces AND/OR distributes ] is safe, of high quality and meets all applicable legislation and standards. [ Insert organisation name ] evaluates those products and acts to remove, or, where that is not achievable, to reduce, any identified safety risks. 1.2 [ Insert organisation name ] achieves this through quality assurance, ongoing product monitoring [ , review of customer complaints and product returns, ] and risk assessment, in accordance with the relevant section of the PSIP. 1.3 The PSIP has been shaped with contributions from across the business, including [ eg design, production, quality assurance, customer services,...

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PRECEDENTS
Schedule of Employer‑Favouring Amendments to JCT SBC/AQ 2016 (England): Building Safety Act/HRB, Dutyholder and CDM compliance; design liability; collateral warranties; insurance; payment; insolvency; adjudication (arbitration removed)

The Contract comprises the completed Standard Building Contract With Approximate Quantities 2016 published by the JCT subject to the following amendments: This Contract adopts JCT SBC/AQ 2016 with extensive modifications to reflect design responsibility, building safety and commercial controls. Recitals: Contractor to provide a master programme and Schedule of Information Requirements; confirms site due diligence and accepts full CDP design liability. Articles: Dutyholder Regulations added; Tender Price covers Principal Contractor duties; arbitration removed; Schedule of Amendments prevails; strict protection of Third Party Agreements. Definitions/governance: new and revised terms (Building Safety Regulator, HRB, Practical Completion, Copyright Material, Design Sub‑contractors, Dutyholder Regulations); several deletions; English court jurisdiction. Design/materials/information: skill‑and‑care design and coordination; only new, compliant, non‑deleterious materials; golden thread storage; monthly programme reporting; site risks at Contractor’s risk. Procedures/controls: tighter instruction, testing, defects and as‑built duties; enhanced confidentiality and IP licences; HRB assistance; CDM/Dutyholder competency confirmations. Sub‑contracting/rights: prescribed sub‑contracts, insurances and delivery of collateral warranties/third‑party rights; limits on assignment. Payment/commercial: 28‑day final...

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