TRW & Co · Real estate and projects
Real Estate Design Responsibility in Singapore
Design responsibility in Singapore is not fixed by job title or procurement label. It sits where statutory roles under the Building Control Act 1989, the Architects Act 1991 and Professional Engineers Act 1991 meet the parties’ contract terms. Appointing a qualified person does not allocate every private design risk, so map who designs what in an express, maintained responsibility matrix.
Key pointStatutory QP appointment answers who may perform regulated functions and submit; it does not decide fitness-for-purpose, coordination, supervision or novation risk between the contracting parties. Those need express contractual allocation, kept current through value engineering and specialist design.
At a glance
Statutory roles
The Building Control Act 1989 sets the framework for building works approvals and the role of qualified persons in submissions and supervision.
Professional regimes
The Architects Act 1991 and Professional Engineers Act 1991 govern who may practise and perform regulated professional functions in Singapore.
Contract allocates private risk
Who is responsible to whom for design deliverables, coordination and performance is a contract question, often based on PSSCOC or other standard forms.
Generic wording is risky
Statements such as “the contractor is responsible for all design” are usually cut back or extended by other documents. Define scope precisely.
Novation and specialists
Novated consultants and specialist subcontractor design shift responsibility mid-project. The matrix must be updated each time, or gaps and overlaps appear.
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This guide to design responsibility in Singapore sets out how the rules apply in practice, which authority is involved, what evidence decision-makers need and where the common mistakes lie. It is written for boards, founders, general counsel and advisers working through Singapore.
Design responsibility in Singapore: the short answer
In Singapore projects, design responsibility is not fixed by job title, procurement label or a single appointment. It sits at the intersection of statutory roles under the Building Control Act 1989, the professional regimes in the Architects Act 1991 and the Professional Engineers Act 1991, and the parties’ chosen contract terms, including any Public Sector Standard Conditions of Contract (PSSCOC) or other standard forms published by the Building and Construction Authority (BCA). Each framework answers a different question: who may carry out regulated professional functions, who is contractually responsible to whom for design deliverables and performance, and who must submit and coordinate approvals. Those answers often overlap, but they are not interchangeable.
Decision-makers should therefore build and maintain a responsibility matrix that traces “who designs what” across five dimensions: statutory role, contractual scope, submission and approval obligations, design coordination and change control. Doing this early, and keeping it current through novation, value engineering and specialist vendor design, is the single best way to prevent gaps, duplication, claims and latent-defect risk.
Two consequences follow. First, statutory appointment of a qualified person (QP) — an architect or professional engineer with a practising certificate — does not by itself allocate every private design risk, fitness-for-purpose duty, coordination obligation, construction supervision role or novation effect between the contracting parties. Those must be addressed expressly in the contract and related project documents. Second, in design-and-build or EPC-style routes, broad statements like “the contractor is responsible for all design” rarely stand alone; they are cut back or extended by employer’s requirements, reference designs, reliance on information, approvals pathways and professional endorsements. To control outcomes, define the design product, the necessary professional status of designers, how the approvals will be obtained and by whom, and what happens when design intent changes.
The law sets who may practise architecture or professional engineering, and the Building Control Act regulates who may submit and take responsibility for plans. But commercial risk for performance, interfaces and coordination is set mainly by the contract. Your answer therefore depends on precisely what the contract and appointments say, and on the structure of submissions, reviews and approvals you implement.
Scope, authority and the distinctions that change the answer
Project teams often conflate three distinct frameworks. Keeping them apart will change how you allocate risk, price it and monitor it:
1) Statutory and professional authority. The Building Control Act establishes the role of a qualified person (QP) as a registered architect with a practising certificate or a professional engineer with a practising certificate. The Architects Act and the Professional Engineers Act create the professional regimes for those disciplines. These statutes deal with who is authorised to perform regulated professional functions, endorse submissions and, in defined circumstances, take responsibility to the authorities for the adequacy of plans and related matters. They do not decide every private obligation in a construction contract, and they do not, by themselves, impose a fitness-for-purpose duty in private law.
2) Contractual allocation. The parties allocate design deliverables, reliance, performance standards, approvals and coordination through their contract. In public-sector projects, the BCA’s Public Sector Standard Conditions of Contract (PSSCOC) and other standard forms provide a widely used baseline. In private-sector work, parties often start from standard forms identified by BCA or bespoke forms. In all cases, the contractual scope, change mechanisms and risk clauses determine which party warrants what, who coordinates interfaces between packages, and the standard to which the design must perform. These provisions can, and often do, allocate risks very differently from the statutory QP framework.
3) Project governance and evidence. Submissions, approvals, design reviews, change logs and certificates create the factual record that proves who did what, when and with what authority. That record decides outcomes on contentious issues like whether a contractor assumed design responsibility for a specialist system, whether an architect’s review was advisory or approving, and whether a deviation was directed or volunteered. The strongest governance distinguishes advice from approval, and requires explicit acceptance of design risk when scope migrates.
These distinctions lead to practical pivot points:
- Procurement route. Traditional, design-and-build, EPC or CM arrangements assign design responsibility differently. Under a design-and-build contract, the contractor may assume primary design obligations but the employer’s requirements, reference or concept designs and any novated consultants will shape how far that duty extends and who carries reliance risk.
- Professional status and endorsements. Where the design must be prepared or endorsed by an architect or professional engineer, the relevant professional’s scope, appointment and insurance need to match the obligation. Without a corresponding appointment and cover, a contractor’s broad promise may create a gap.
- Approvals and submissions. A QP-led submission to the authority is a regulatory pathway, not a complete allocation of private risk. Contract terms should say who prepares information, who carries coordination risk for authority comments, and who pays when resubmissions are required by design changes or constraints.
- Novation and specialist design. When consultants are novated to the contractor or when specialist vendors design temporary or permanent works, responsibility can fragment. Contracts should state who integrates and warrants those components, how departures from the reference design are handled and what professional endorsement is required.
Understanding where statutory authority stops and private allocation starts prevents two costly errors: assuming that the statutory QP role absorbs all design risk, or assuming that a contractor’s general design duty removes the need for defined professional endorsements and approvals management.
Process, documents and evidential control
Because Singapore projects operate at the intersection of statutory and contractual frameworks, process discipline is crucial. Organisations that achieve predictable outcomes share four habits.
Map the design scope early
Create a responsibility matrix that lists every significant design element, the professional status required, the contractual owner, the submitter, the approver and the coordinator. Use naming rules that match the contract: “design deliverable” for the product, “review” for advisory comments, “approval” for risk acceptance under the contract, and “endorsement” for a professional’s statutory function. Keep the matrix live through tender, post-award clarifications, novation, value engineering and change orders.
Separate advisory review from approval
Reserve the term “approval” for the moment when a party with contractual authority accepts risk transfer, such as approving a contractor’s design that meets the employer’s requirements. Label other interactions “review” and track comments. Doing so avoids the argument that a non-binding review created a duty to detect design errors. It also helps isolate the statutory QP’s role in submitting and endorsing plans from the employer’s or engineer’s contract-level approvals.
Design change control
Design tends to migrate as site constraints, cost pressures and specialist inputs crystallise. Use formal design change notices with a clear risk statement: what design is changing, who proposed it, what approvals and endorsements are required, what performance standard applies, and who coordinates re-submissions. Record authority comments and resubmissions by reference to the same change notice to preserve an audit trail.
The documents that carry evidential weight include:
- The employer’s requirements or brief, including performance and interface criteria.
- Reference or concept designs, and any express limits on reliance.
- Consultant appointments and any novation deeds, with scope, reliance and insurance clauses aligned to the construction contract.
- Design deliverables schedules, submittal registers and approval gates, including the required status for each discipline and stage.
- Professional endorsements, certificates and submissions by the QP and any professional engineer engaged for specific systems or temporary works.
- Design review minutes, comment resolution matrices and approvals issued under the contract.
- Design change notices, instruction logs and variation orders.
- Testing and commissioning plans and results that demonstrate design performance against the specified standard.
Maintaining this record reduces the scope for retrospective claims about who owned a design risk or whether an approval transferred responsibility.
Operational and commercial implications
Design is where commercial and technical risk meet. The way you allocate and evidence design responsibility will affect price, programme and insurability.
Pricing and contingencies. A contractor asked to assume wide design obligations will price for professional inputs, coordination time, iterative authority comments and residual risk. Where employer’s requirements are detailed, tenderers will price the risk of inconsistencies and gaps. Conversely, if the contractor can rely on a complete and accurate brief, with timely approvals and decisively managed change, the price should reflect that certainty. State clearly whether the contractor has a duty to verify or may rely on information provided by the employer and any retained consultants.
Programme and sequencing. Authority submissions and resubmissions create critical-path dependencies. If the approvals pathway is not aligned to the design responsibility matrix, programme risk multiplies. Allocate who sequences submissions, how long reviews will take and what happens if comments require redesign. Avoid implied obligations by making review timeframes and consequences explicit in the contract’s procedures.
Interfaces and specialist systems. In complex buildings, performance is achieved through interfaces: structure-to-façade, MEP-to-architectural tolerances, systems integration, life-safety logic. Even where each discipline is competently designed, performance failures often arise at the interface. Assign a single party to coordinate multi-disciplinary interfaces and to carry the risk that the whole performs to the specified standard. Where specialist vendors provide design-and-supply packages, set the rules for integration, including data formats, models, sample approvals and professional endorsements.
Insurance and professional liability. Statutory regimes govern who may provide professional services. Align your contract with the relevant appointments and insurance. If a contractor promises to warrant professional design prepared by others, ensure there is back-to-back responsibility and that the professionals have the correct practising status and cover. Specify whether project insurance, consultant PI and contractor PI respond to design defects, and how deductibles and notification are handled where more than one policy could respond.
Temporary works and means-and-methods. Temporary works design is frequently undertaken by specialist engineers engaged by the contractor. Be explicit about who carries design responsibility and professional endorsement for these works, who coordinates with the permanent works designer and QP, and how changes or failures are managed and notified. Temporary works may fall outside the employer’s core design scope but can still drive programme, cost and safety outcomes.
Fitness for purpose and performance standards. Some contracts impose a performance or fitness-for-purpose obligation on the design-builder. Others use a skill-and-care standard aligned to professional norms. The difference is material to insurability and price. If your project requires a performance outcome, define the outcome precisely and align it with the approvals and testing regime. If the standard is skill and care, avoid language that inadvertently elevates it to a fitness standard.
Governance and dispute posture. Clear matrices, disciplined approvals and documented change give you options if defects appear or if completion is contested. They enable early, evidence-based management and reduce the cost of expert replication. They also improve the credibility of commercial positions presented to counterparties, lenders and, if necessary, tribunals.
For broader strategic context on capital projects decision-making and market developments, you may find perspectives at our regional commentary hub relevant when framing executive communications and board briefs on design allocation choices.
Design responsibility in Singapore: tracing who designs what on a live project
Disputes about design rarely start with a defect. They start with an assumption, made at tender, that someone else was covering a design element. Managing design responsibility in Singapore well means testing those assumptions across five dimensions: statutory role, contractual scope, submissions, coordination and change control.
Illustrative scenario: a design-and-build industrial facility
Illustrative only; the facts are invented to show the decision points.
A manufacturer procures a new facility on a design-and-build basis. The employer’s architect prepares concept design and is novated to the contractor. The contract says the contractor is responsible for “all design”, and the specialist cleanroom supplier provides its own design.
The first decision point is the employer’s requirements. Counsel finds that the employer’s concept drawings were made contract documents, with no statement on whether the contractor takes responsibility for errors in them. The contract is amended to state expressly how pre-novation design is adopted.
The second decision point is statutory roles. The matrix records which qualified persons make building plan and structural submissions and who supervises the works. It separately records contractual responsibility, so that QP appointment is not mistaken for private risk allocation.
The third decision point is specialist design. The cleanroom supplier’s design interfaces with structure and building services. The matrix assigns coordination to the contractor’s design manager, requires the supplier’s design to be submitted for review, and links the supplier’s warranty and insurance to the scope it designs.
| Dimension | Question | Source of the answer | Typical evidence |
|---|---|---|---|
| Statutory role | Who acts as QP and supervises? | Building Control Act, professional Acts | Appointments, submissions |
| Contractual scope | Who is liable to whom for which design? | Main contract, appointments, subcontracts | Scope schedules, employer’s requirements |
| Submissions | Who prepares and lodges approvals? | Contract and statutory framework | Approvals tracker |
| Coordination | Who resolves interfaces between designers? | Contract and design management plan | Coordination drawings, clash reports |
| Change control | How are design changes approved? | Variation and design review clauses | Change register, review comments |
The matrix does not need to be elaborate. A spreadsheet listing each design element against the five dimensions, with the source document and the date last reviewed, is enough for most projects. What matters is that it is revisited at each trigger point: contract award, novation, value engineering, specialist subcontract award and any change in approvals strategy.
Does QP appointment make the designer responsible for everything?
No. The qualified person performs statutory functions under the Building Control Act, including preparing and submitting plans and, where applicable, supervising works. That role sits alongside, not in place of, contractual responsibility. Whether the QP’s firm is liable to the employer for a design outcome, whether it owes a fitness-for-purpose duty and whether it must coordinate other designers depend on its appointment terms. Owners should read the appointment with the main contract to see where each risk actually lands, and record the answer in the matrix.
Who owns approval risk in design-and-build?
The contract decides. Many design-and-build contracts place responsibility for obtaining approvals on the contractor, but employers often retain responsibility for planning permission or for approvals linked to their own requirements. Delays caused by approval conditions or authority queries can then become a dispute about who bore the risk. Set out clearly which approvals each party obtains, who bears the consequences of conditions and delay, and how changes required by authorities are treated under the variation and time provisions, so that both sides can price that risk at tender.
How should we handle novated consultants?
Novation transfers the consultant’s ongoing obligations to the contractor, but questions often remain about liability for design produced before novation. Address this expressly: state whether the novation is ab initio or from the novation date, what the contractor accepts about pre-novation design, and whether the employer retains any direct rights through warranties. Update the responsibility matrix on the date of novation and confirm each party’s insurance reflects the new allocation, so that no design period is left uncovered by a responsible party.
Our construction contracts lawyers draft appointments and matrices that make design responsibility in Singapore explicit, and our construction disputes team acts when allocation is contested.
Common mistakes
Experienced owners and contractors make repeatable errors when the statutory, contractual and governance threads are not kept distinct:
- Assuming the statutory QP appointment allocates private design risk across the project, including fitness-for-purpose, coordination and supervision. It does not. Those issues need express contractual allocation.
- Using generic wording such as “contractor responsible for all design” without aligning consultant appointments, novation deeds, submission pathways and professional endorsements.
- Failing to specify the standard of performance for design obligations, leaving ambiguity between skill-and-care and fitness-for-purpose outcomes.
- Letting advisory reviews be called “approvals” in correspondence and minutes, blurring who has accepted risk and making it harder to resist defect claims premised on alleged approval.
- Not maintaining a structured approvals register that ties every submission, comment and resubmission to a single design element and change notice.
- Overlooking integration risk for specialist vendor designs, especially for façade systems, life-safety systems and controls integration.
- Ignoring the insurance dimension: insufficient PI cover for professional roles, or a mismatch between the insured professional and the contractual risk assumed by another party.
- Failing to update the matrix when scope migrates through value engineering, provisional sums activation or late employer changes.
- Treating temporary works as routine means-and-methods without defining professional endorsement, interface obligations and notification triggers.
Action plan and decision points
The steps below help decision-makers translate principle into project controls. Tailor each step to your procurement route, consultant structure and lender requirements.
| Step | Decision or action | Evidence or record | When to escalate |
|---|---|---|---|
| 1 | Define the design responsibility matrix across statutory role, contractual scope, approvals, coordination and change control. | Signed matrix aligned to contract schedules, consultant appointments and submission plan. | If any design element lacks a responsible party with appropriate professional status and insurance. |
| 2 | Align professional appointments and insurance with contractual design obligations, including novation if used. | Executed appointments/novation deeds; insurance certificates; back-to-back clauses on reliance and scope. | If a contractual design duty is not mirrored by a professional engagement or cover. |
| 3 | Set the design approval and review procedure, distinguishing advisory review from contractual approval and statutory endorsement. | Procedure in contract or project execution plan; submittal register; approval gates with defined timelines. | If parties use “approval” loosely in correspondence or minutes, or review timelines slip onto the critical path. |
| 4 | Establish authority submission responsibilities and programme logic, including resubmission triggers and cost responsibility. | Submission schedule; QP designation; register of authority comments linked to design elements. | If comments require material redesign, affect compliance margins or threaten key milestone dates. |
| 5 | Control design change through formal notices with risk statements and updated approvals and testing plans. | Design change notices; updated ERs; variation orders; traceable audit linking to submissions and approvals. | When a change impacts performance standards, statutory endorsements, insurability or third-party warranties. |
| 6 | Integrate specialist and temporary works design with defined interface responsibility and professional endorsements. | Package interface matrices; PE endorsements for applicable systems; coordination meeting records. | If conflicting vendor specifications emerge or if temporary works affect permanent works performance or safety margins. |
| 7 | Set testing, commissioning and performance demonstration aligned to the specified design standard. | Integrated test plans; commissioning records; performance certificates tied to ER outcomes. | If tests expose systemic interface failures or shortfalls against stated performance outcomes. |
| 8 | Keep the evidence trail: approvals register, comment resolution, endorsements and instruction logs. | Centralised register; version-controlled submittals; signed approvals; professional certificates. | If records diverge across parties or if disputed “approvals” appear in informal channels. |
Decision-maker checklist
- Have we mapped every major design element to a responsible party, with the correct professional status where required by law?
- Does our contract state the design standard (skill and care versus fitness for purpose) and align that with testing and acceptance?
- Have we reconciled the architect/engineer’s statutory roles with their contractual roles and insurance?
- Who prepares, submits and resubmits authority documents, and who pays if resubmission is required by design change?
- Are consultant appointments and any novation deeds back-to-back with the construction contract on scope, reliance and IP?
- Is there a single point accountable for multi-disciplinary interface coordination and system performance?
- Do our procedures clearly separate advisory reviews from contractual approvals and professional endorsements?
- What is the escalation path if authority comments or testing outcomes jeopardise programme or performance?
- Have we captured temporary works design, endorsements and interfaces in the matrix?
- Is the approvals and change record complete, consistent and retrievable for dispute resolution and audit?
Questions on design responsibility in Singapore often sit alongside these areas of our work:
See all Singapore practice areas or contact the Singapore office.
Sources and official materials
Official sources checked for this insight:
- Building Control Act 1989
- Professional Engineers Act 1991
- Architects Act 1991
- Public Sector Standard Conditions of Contract
Sources checked 17 October 2026. Current law and guidance should always be checked before acting, including any updates to BCA standard forms and public-sector procurement conditions.
For related mandates and sector coverage, visit our practices. For decision-focused briefings you can circulate to your deal team or project board, please book a consultation.
Frequently asked questions
01Does QP appointment make the designer responsible for everything?
No. The Building Control Act frames the QP’s regulatory role and responsibility to the authorities for submissions and related matters. It does not, by itself, allocate private contractual risk for performance, fitness-for-purpose, coordination, supervision or novation. Those must be set out in the contract and aligned with professional appointments and insurance.
02Who owns approval risk in design-and-build?
Typically the contractor owns the risk of producing a compliant design that meets the employer’s requirements, while the QP leads statutory submissions. But outcomes turn on the contract: who must prepare information for submissions, who coordinates responses to authority comments, how resubmissions affect time and money, and whether reliance on employer-provided information limits exposure. Align the approvals pathway with the matrix and programme.
03How should we handle novated consultants and specialist vendors?
State who integrates and warrants their designs, whether departures from the reference design are permitted, the required professional endorsements and who carries interface risk. Ensure the novation deed and the contractor’s obligations are back-to-back on reliance, scope, IP and insurance. Keep the approvals and change records aligned to the same packages to preserve a coherent audit trail.
04Who should own the responsibility matrix?
The employer’s project manager or lead consultant usually maintains it, with input from each designer and the contractor, and legal review at key points such as contract award, novation and major value engineering. What matters is that one person owns the document, that it is version-controlled and that changes are approved by the parties affected. A matrix that sits in a drawer after tender gives little protection when a defect emerges years later.
05How does design responsibility affect insurance?
Insurance should follow the allocation. Designers typically carry professional indemnity cover, while design-and-build contractors may need cover for the design they assume, including design by their subcontractors. Gaps arise when the contract places a fitness-for-purpose obligation on a party whose insurance responds only to negligence. Review insurance requirements alongside the matrix before contract award, and ask brokers to confirm cover against the actual obligations rather than the job titles.
06What changes when an overseas design team is involved?
Overseas designers can contribute, but regulated functions in Singapore, such as making submissions as a qualified person, must be performed by appropriately registered professionals. Define clearly which Singapore professional takes statutory responsibility, how overseas work is reviewed and adopted, and who carries contractual liability for it. Check that the overseas team’s deliverables are prepared to Singapore codes and that their insurance and appointment terms align with the local responsibility chain.
General information only, current as at 20 October 2026. It is not legal advice and does not create a lawyer–client relationship. Singapore law and regulatory practice change; check current official sources and take advice on the facts of your matter.
