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Design and Build Contracts in Ireland: What Contractors Need to Know
Written by Jack Doherty
Design and build procurement is growing across Irish public and private sector construction. Understanding how it works, what it demands, and how to price and manage D&B risk is essential for contractors moving into this market.
In traditional construction procurement, the client appoints a design team separately, then goes to tender for a contractor to build the designed scheme. In design and build, the contractor takes responsibility for both design and construction. This changes the risk profile of the contract fundamentally - and rewards contractors who understand how to manage design as well as construction.
D&B procurement is increasingly used in Irish public sector construction - particularly for education, healthcare, office buildings, and mixed-use projects - because it transfers design risk to the contractor and can deliver projects faster than traditional two-stage procurement.
D&B vs traditional procurement - the key differences
In traditional procurement, the client's design team produces a complete set of drawings and specifications before tender. The contractor prices a defined scope. Design risk stays with the client. In D&B, the client issues an Employer's Requirements document that describes the functional and performance requirements for the building. The contractor produces a design (through their own design team or novated consultants) and a price to deliver it. The contractor carries design risk. The advantage for clients is single-point responsibility and price certainty at an earlier stage. The advantage for contractors is the ability to apply construction knowledge to the design and - for efficient contractors - generate margin on the design as well as the build.
The GCCC Design and Build form
The GCCC (Government Contracts Committee for Construction) D&B form is the standard form for Irish public sector design and build contracts. It was revised in 2023 and is used by government departments, local authorities, and state bodies for D&B procurement. Key features include: fixed price and fixed time (limited contractor recourse for employer risk events), design liability provisions that approach a fitness for purpose standard in some respects, a Employer's Requirements document as the primary contractual brief, and a Contractor's Proposals document produced at tender stage committing the contractor to the design. Understanding how the GCCC D&B form allocates risk - particularly around design liability, ground conditions, and employer change - is essential before pricing a public sector D&B project.
Design liability and fitness for purpose
The most important risk to understand in a D&B contract is design liability. In traditional procurement, the designer's liability is limited to reasonable skill and care. In most D&B contracts, the contractor's design obligation approaches a fitness for purpose standard - the building must perform as the Employer's Requirements specified, regardless of whether the design was produced with skill and care. This is a higher and more absolute standard. Standard Professional Indemnity insurance typically covers reasonable skill and care but not fitness for purpose. Before signing a D&B contract, review the design liability provisions carefully. Consider whether your PI insurance covers the liability you are accepting. Negotiate to limit your design liability to reasonable skill and care where the client allows.
Tendering D&B effectively
D&B tenders are more resource-intensive than traditional tenders because you must develop a design as well as a price. Effective D&B tendering requires: an early read of the Employer's Requirements to identify areas of design freedom and areas of tight specification, a cost plan that reflects your design assumptions at each stage, a clear design programme that integrates with the construction programme, a named design team with relevant experience for this project type, and a Contractor's Proposals document that responds explicitly to every requirement in the ER. D&B tenders that score well at quality evaluation demonstrate design innovation - showing how your approach adds value over a basic compliant scheme - not just compliance with the ER. Clients choose D&B partly because they hope contractors will bring ideas. Show them yours.
Post-award design management
Winning a D&B contract is the beginning of the design management challenge, not the end. Post-award, the contractor must manage the design process to ensure: design information is produced in line with the construction programme, design changes are managed through a formal change control process, employer instructions are assessed for change entitlement before they are implemented, design approvals from the client's technical advisers are obtained in writing before construction, and the as-built record information is compiled progressively rather than left to the end. D&B projects that go wrong typically do so because the contractor loses control of the design programme, allows scope creep without contractual change, or fails to manage the client's evolving requirements within the agreed Employer's Requirements framework.
Design and Build procurement in Ireland
Design and Build (D&B) is a construction procurement model in which the contractor takes on responsibility for both the design and construction of the project, rather than the client retaining responsibility for design through a separate design team (as in the traditional design-bid-build model). In a D&B contract, the client describes what they want through an 'employer's requirements' document, which may range from a high-level performance specification with minimal design detail through to a detailed design developed to RIBA Stage 3 or beyond, and the contractor is responsible for developing the design to construction stage and delivering the completed project in accordance with those requirements. Clients choose D&B procurement for several reasons: single point of responsibility (one contractor is accountable for design quality, programme, and cost, there is no scope for disputes between the design team and contractor that can occur in traditional procurement); programme advantage (the contractor can start construction on early works packages while design of later elements is still being developed, compressing the overall project programme); price certainty at an earlier stage (the contractor gives a fixed price before the design is fully developed, giving the client cost certainty sooner than in traditional procurement); and buildability (the contractor can influence the design to select construction methods and materials that they can deliver efficiently, potentially reducing cost). The D&B model does carry disadvantages for clients: less design control (the client has less direct oversight of design quality and specification detail after the contract is signed); variation risk (changes to the employer's requirements after the contract is signed tend to be expensive under D&B, as the contractor prices variations from their fixed-cost design baseline).
Irish D&B contract forms and employer's requirements
Unlike the UK, Ireland does not have a widely adopted standard D&B contract form. In the UK, the JCT Design and Build Contract 2016 is the standard form for most D&B projects. In Ireland, D&B procurement typically uses one of: a modified RIAI (Royal Institute of Architects of Ireland) form (the standard RIAI building contract, modified by a schedule of design obligations to reflect the contractor's D&B responsibilities, not ideal as the RIAI form was not designed for D&B and the modifications can create ambiguity); a bespoke D&B contract developed by the client's solicitors and professional team (used on major projects where the client's advisors develop a fit-for-purpose D&B contract); the NEC4 Engineering and Construction Contract with design responsibilities allocated under the contract's Works Information (a more modern, process-focused contract that works well for D&B when properly configured); or in some cases, the FIDIC Yellow Book (Conditions of Contract for Plant and Design-Build, used for major infrastructure and engineering-heavy projects). The quality of the employer's requirements document is critical in D&B procurement, a poorly drafted employer's requirements document (one that is ambiguous, internally inconsistent, or silent on key performance criteria) creates significant risk for both the client and the contractor. Clients should invest in professional preparation of the employer's requirements document, and contractors should review the employer's requirements carefully before pricing and seek clarification on ambiguous items. Items not clearly specified in the employer's requirements become a risk allocation question, in most D&B contracts, the contractor is responsible for meeting the overall performance intent of the employer's requirements even where specific elements are not explicitly described.
D&B in Irish data centres and public sector
D&B procurement is particularly prevalent in two Irish construction market segments: data centres and the public sector. Irish data centre construction, the shell-and-core construction of the hyperscale and wholesale colocation data centre campuses that have been a major driver of Irish construction activity in recent years, is predominantly delivered on a D&B basis. Data centre clients (technology majors, data centre developers such as CyberCon, NTT, Digital Realty, and others) use D&B because programme certainty is critical (delays to a data centre opening have significant operational and revenue consequences), because the technical specifications for data centre shell, power, and cooling infrastructure require contractor expertise in implementation, and because single-point-of-responsibility aligns with the client's operational risk management. The main contractors active in Irish data centre D&B include Mercury Engineering, Winthrop Engineering, John Sisk, and international contractors active in the Irish data centre market. For public sector D&B procurement in Ireland, the OGP (Office of Government Procurement) and the Department of Housing have published D&B guidance and model documentation for public sector clients who choose D&B. Public sector D&B contracts in Ireland are subject to the EU Procurement Directives and must be tendered in accordance with the Public Procurement Guidelines, typically using the restricted procedure (two-stage) with a pre-qualification stage (PQQ) followed by an invitation to tender. For contractors targeting public sector D&B work, CIRI registration, Safe-T-Cert, ISO 9001, and appropriate financial standing are the standard prequalification requirements.
Common questions about design and build contracts in Ireland
What is an Employer's Requirements document in a design and build contract?
The Employer's Requirements (ER) document is the client's brief in a design and build contract. It sets out what the completed building must achieve - in terms of function, performance, specification, and programme - without necessarily specifying how it is to be designed or built. The contractor's design team then develops a scheme that meets the ER, which forms the basis of the Contractor's Proposals submitted at tender stage. The Employer's Requirements can be detailed or high-level depending on the client's preference. A detailed ER with specific technical performance requirements gives the client more certainty but allows less design innovation. A high-level ER gives the contractor more design freedom but creates more risk around the client's final expectations. Disputes about whether the completed building meets the ER are one of the most common sources of D&B contract claims.
What is the difference between fitness for purpose and reasonable skill and care in design and build?
In traditional procurement, a designer's liability is limited to exercising reasonable skill and care - the standard applied to professional services. In design and build contracts, the contractor typically takes on an obligation that the completed building is fit for its intended purpose - a higher and more absolute standard. A building can be designed with reasonable skill and care and still not be fit for purpose. The fitness for purpose obligation is more onerous and may not be covered by standard Professional Indemnity insurance. Irish D&B contractors should carefully review the design liability provisions in their contract, particularly the GCCC D&B form which has been interpreted as imposing a fitness for purpose standard in some respects. Taking legal advice before accepting a D&B contract with fitness for purpose design liability is advisable.
Which form of contract is most commonly used for design and build in Ireland?
The most widely used form for Irish public sector D&B work is the GCCC (Government Contracts Committee for Construction) Design and Build contract, which was updated in 2023. For private sector D&B, the RIAI form can be used in a design and build configuration, and NEC4 Option F (Design Build Finance Operate) is increasingly used for larger PPP and infrastructure projects. For international or large-scale industrial projects in Ireland (data centres, pharmaceutical facilities), FIDIC Yellow Book (Plant and Design-Build) and Silver Book (EPC/Turnkey) are commonly used. The NEC suite is increasingly common for public sector projects requiring active programme management and early warning notification. Each form has materially different risk allocation and requires specific expertise in its administration.
What does novation of a design team mean in a Design and Build contract in Ireland?
Novation of the design team is a legal process used in Design and Build (D&B) procurement where the client transfers the existing design team appointment (the appointment of the architect, engineer, and other consultants) from the client to the D&B contractor. Before novation, the design team is engaged by and owes its professional duties to the client. After novation, the same design team is engaged by and owes its professional duties to the D&B contractor, while continuing to develop and manage the same design. The commercial rationale for novation is to give the client the benefit of a project-specific design (developed by the client's design team to a stage that defines the client's requirements in detail) while also giving the contractor the single-point-of-responsibility benefit of D&B (the contractor is responsible for the completed design and its compliance with the employer's requirements). Novation carries significant risks for contractors that must be carefully evaluated before the contractor accepts the novated appointment. The contractor is typically bound by design decisions made before novation (during the pre-novation design phase) even if those decisions now create problems for the contractor's buildability or commercial delivery. Design liability: after novation, the contractor becomes the employer of the design team and is responsible for the design team's performance, if the architect makes a design error after novation, the contractor is liable to the client for the consequences. The contractor must ensure that the novated design team's professional indemnity insurance remains in place and at an adequate level throughout the construction period and the relevant limitation period after practical completion.
Do D&B contractors need professional indemnity insurance in Ireland?
Yes, Design and Build contractors in Ireland who take on design responsibility (either by employing designers in-house or by novating or directly engaging a design team) need professional indemnity (PI) insurance to cover their design liability exposure. In a traditional construct-only contract, the contractor builds to a design provided by the client's design team, the contractor does not take on design liability and therefore does not require PI insurance for the design element of the work. In a D&B contract, the contractor takes on single-point-of-responsibility for both design and construction, and this includes design liability to the client for design errors, omissions, or non-compliance with the employer's requirements. PI insurance for a D&B contractor covers claims arising from design errors, for example, if the contractor's design fails to achieve the performance specification in the employer's requirements (insufficient acoustic performance, failure to meet energy performance targets, structural inadequacy), the cost of redesigning and rectifying the defect is a PI claim. The level of PI cover required depends on the scale of the project and the nature of the design risk. Major D&B contractors (delivering projects above EUR 20m) typically carry PI cover at EUR 5m-20m per claim. Smaller D&B contractors should carry PI cover commensurate with the maximum single-project design liability exposure they face. PI insurance is arranged on a 'claims made' basis, the policy in force when the claim is notified responds, not the policy in force when the design error was made. This means that PI cover must be maintained for the full duration of the limitation period after project completion (typically 6 years for contractual claims, 12 years for deed-based claims).
How do you price Design and Build risk in Ireland?
Pricing D&B risk in Ireland requires a systematic analysis of the risk allocation in the employer's requirements and the proposed contract, and the application of risk allowances that reflect the contractor's assessment of the probability and cost of each identified risk. Key areas of D&B risk that require careful pricing include: employer's requirements risk, the employer's requirements document defines the performance specification that the contractor must achieve. Ambiguity or incompleteness in the employer's requirements creates risk for the contractor, who may be required to deliver additional scope (to meet the performance specification) beyond what was anticipated when pricing. Pricing D&B from an underdeveloped employer's requirements document is high risk, the contractor should include allowances for elements that are likely to be required but not fully specified, and should seek clarification on ambiguous requirements before submitting a fixed price. Design development risk, in D&B, the contractor is responsible for developing the design from the stage at tender to the fully detailed design required for construction. Changes required during design development (for example, changes to structure or services routing discovered during detailed design) are at the contractor's risk unless they result from a change to the employer's requirements or a pre-existing site condition. Allowing for design development risk requires the contractor to have good knowledge of the building type and the likely design challenges at the project-specific site. Statutory approval risk, planning conditions, building regulation requirements, and third-party consents may require design changes after the D&B contract is entered into. Under most D&B contracts, the contractor bears the risk of complying with statutory requirements in effect at the time of contract (unless there are subsequent changes in law), even if compliance requires design changes from the tender design.
Jack Doherty
Founder and CVO, WDI
Jack founded WDI, which builds and runs email and LinkedIn outreach for Irish B2B and construction firms.
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