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The key distinction is what the obligation promises. A reasonable-skill-and-care term assesses how a construction professional performed the service: did they act with the care and competence expected of a reasonably competent member of that profession? A fitness-for-purpose term is framed around the result: does the design, work or service meet the particular purpose or performance promised in the contract?
Those labels do not decide every dispute by themselves. The signed appointment, specifications, exclusions, statutory wording, project facts and applicable law all matter. In the UK construction context, section 13 of the Supply of Goods and Services Act 1982 is the statutory starting point for an implied reasonable-care-and-skill term in a relevant contract for services. It is not, by its wording, a general guarantee that a project will achieve every intended result.
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What the two obligations mean
Reasonable skill and care
A reasonable-skill-and-care obligation is concerned with professional performance. The question is whether the designer, consultant or other service provider carried out the agreed service with the level of care and competence expected from a reasonably competent member of the same profession.
That standard is not a promise that the design will be perfect or that construction will never encounter a problem. It is a process-and-competence standard. A professional may still face a claim if a competent peer would have identified a foreseeable issue, used a different accepted method, checked information that should have been checked, or warned the client about a material risk.
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The exact benchmark depends on the service and circumstances. A structural engineer, architect, building-services designer and clerk of works perform different roles, so the relevant comparison is with a reasonably competent practitioner doing the same kind of work in the same context. The appointment may also define the scope, information to be supplied, assumptions, limitations and deliverables against which performance is judged.
Fitness for purpose
Fitness for purpose is a different type of promise. In plain terms, it focuses on whether the supplied design, work or service is fit for the particular purpose identified by the contract or circumstances. The emphasis is on an outcome or required performance rather than only on the care taken while producing it.
That can be a more demanding commitment for a professional, especially where the contract identifies a precise output, capacity, tolerance, environmental condition or operational result. But it is not safe to assume that every reference to a purpose creates an absolute guarantee. The words used, who selected the solution, what information was available, the allocation of design responsibility and the rest of the contract determine the legal analysis.
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The distinction is therefore useful as a way to read an appointment, not as a shortcut to liability. A court or adviser would need to examine the actual term and the facts before deciding whether the promise is about competent performance, a specified result, or both.
What section 13 of the 1982 Act provides
The official legislation page states:
“In a relevant contract for the supply of a service where the supplier is acting in the course of a business, there is an implied term that the supplier will carry out the service with reasonable care and skill.”
Read the current text at section 13 of the Supply of Goods and Services Act 1982. The provision is directed at a relevant contract for the supply of a service and a supplier acting in the course of a business. It supplies an implied reasonable-care-and-skill term; the statutory sentence does not itself say that the supplier guarantees fitness for every purpose.
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The legislation page records that the relevant wording was substituted by the Consumer Rights Act 2015, with the change effective on 1 October 2015. That date matters when reviewing older appointments, correspondence or pleadings, because the wording in the current online text is amended wording rather than an untouched 1982 provision.
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How the standards differ in practice
| Question | Reasonable skill and care | Fitness for purpose |
|---|---|---|
| What is being promised? | Competent performance of the agreed professional service. | A design, work or service that achieves the identified purpose or result. |
| Primary focus | The professional’s method, judgment, checks, warnings and execution. | The specified outcome or performance of what was supplied. |
| Typical evidence | Appointment scope, design records, calculations, instructions, reviews, warnings and expert evidence about competent practice. | The purpose or performance requirement in the contract, the delivered result, acceptance criteria and evidence of what the parties allocated to the supplier. |
| Source of the obligation | An express term, common-law duty, or an implied statutory term such as section 13 where its conditions are met. | Usually the express contract wording or an obligation established from the contract and circumstances; the available statutory sentence does not state a general fitness guarantee. |
| Effect of wording | Terms may define scope, assumptions and any permitted departures, subject to applicable law. | Small changes in wording can alter whether the promise is an aspiration, a design requirement or a committed result. |
This table describes the conceptual difference only. It does not predict the result of a dispute. A single appointment can contain both standards: for example, reasonable care and skill for professional services and a separate requirement that a defined deliverable meet stated performance criteria.
What duty does a construction designer owe?
The 2021 article Essential law: Defects, part one in Building presents professional designers as owing reasonable skill and care and refers to section 13 as an implied statutory service term. Its publication date was 8 November 2021; the author and subject are also identified in a contemporaneous Charles Russell Speechlys publication notice.
In addition to any contractual term, the article describes the common-law negligence standard as the level expected of a reasonably competent member of the same profession. That description helps explain why expert evidence is often important: the issue is not simply whether a defect exists, but whether the professional’s conduct fell below the competent-professional standard applicable to the work.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The appointment remains central. It may allocate responsibility for design, coordination, checking, site information, buildability, compliance or specialist input. A designer cannot sensibly be assessed against a responsibility the contract did not assign, while a clearly accepted responsibility cannot be ignored merely because the document uses a general “reasonable skill and care” heading.
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How to analyse an alleged defect
- Collect the controlling documents. Start with the signed appointment, amendments, employer’s requirements, scope schedules, specifications, drawings, design responsibility matrix, programme and relevant instructions. Keep the version history so that a later drawing is not mistaken for the original obligation.
- Mark every performance phrase. Separate wording about reasonable skill and care from wording that states a capacity, tolerance, service level, code outcome or other particular result. Note whether the phrase is a firm obligation, a design objective, an assumption or a statement made by someone without authority to vary the contract.
- Define the service actually purchased. Identify what the professional had to design, check, coordinate, inspect, certify or advise on. Record information supplied by the client and information the professional was expected to obtain. A defect allegation should be tied to a defined task rather than to a general expectation that the professional was responsible for everything.
- Test the reasonable-care-and-skill case. Ask what a reasonably competent practitioner in that discipline would have done with the information available at the time. Compare the decision, calculations, checks, warnings and communications with accepted professional practice. Avoid judging the work solely with hindsight after an unusual event has occurred.
- Test any fitness-for-purpose or result case separately. Identify the exact purpose or performance promised, the acceptance measure and the person who selected the solution. Then establish whether the delivered design or service met that requirement. Do not convert a general project aim into a contractual guarantee without wording and evidence supporting that interpretation.
- Trace causation and loss. Even where a duty or term may have been breached, the investigation still needs to connect the act or omission to the physical defect and then to the claimed cost, delay or other loss. Preserve photographs, inspection records, test results, programme data, invoices and contemporaneous notices.
- Check notice, limitation and dispute provisions. Follow the appointment’s requirements for notifying defects, access, inspection, adjudication, arbitration or court proceedings. A technically strong allegation can be compromised if contractual time limits or pre-action steps are missed. A construction solicitor should review these provisions before a formal claim is issued.
Examples of how wording changes the question
A design that fails during ordinary use
If an engineer was engaged to provide professional design services under a reasonable-skill-and-care term, the investigation asks whether the design process met the competent-professional standard. Relevant material could include the brief, calculations, site data, design reviews and warnings about assumptions. The fact of failure is important evidence, but it does not by itself establish that the statutory or contractual standard was breached.
A promised capacity or operating condition
If the appointment expressly requires a system to achieve a stated capacity or operate within a defined condition, the analysis includes that result term. The parties may have created a fitness-for-purpose-style obligation in addition to a general care-and-skill obligation. The precise wording and any agreed testing or acceptance procedure decide what must be shown.
A client-selected product or method
Where the client or another party selected a product, detail or method, responsibility may depend on what the professional was engaged to do with that selection. The designer may still have to exercise reasonable care and skill, identify an evident incompatibility or warn of a material risk, but the contract and communications must be examined before assigning responsibility for the underlying choice.
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The source article was published in 2021, and the official legislation page reflects the amended statutory wording currently displayed online. The material available for this explainer does not provide a refreshed survey of later case law or a complete account of every statutory exception, exclusion rule or professional-negligence doctrine. Treat the comparison as a careful orientation to the two obligations, not as a substitute for current advice on a live dispute.
Older projects also need a timeline. Identify when the appointment was made, when it was amended, when the service was performed and which statutory wording was in force. A change effective on 1 October 2015 does not, by itself, resolve how a particular historic contract is interpreted; the governing law, transitional issues and contract terms still require analysis.
Practical checklist for project teams
- Keep the signed appointment and every amendment in one controlled record.
- Highlight each phrase that describes a required result, capacity, tolerance or purpose.
- Maintain a design-responsibility matrix and update it when scope changes.
- Record assumptions, information requests, warnings and responses contemporaneously.
- Use independent inspection or testing where the contract specifies an acceptance measure.
- Notify suspected defects in the contractual form and within the stated period.
- Preserve the condition of defective work where safe, allowing inspection before remedial changes.
- Obtain discipline-specific expert evidence on competent practice when a reasonable-skill-and-care breach is alleged.
- Take legal advice before relying on a fitness-for-purpose argument, an exclusion clause or a limitation period.
Bottom line for a construction defect review
Reasonable skill and care asks whether the professional performed the agreed service to the standard of a reasonably competent practitioner. Fitness for purpose asks whether the promised result or purpose was achieved. Section 13 of the Supply of Goods and Services Act 1982 supplies an implied reasonable-care-and-skill term in a relevant business service contract; it does not, in its quoted wording, create a general fitness-for-purpose guarantee. The appointment’s exact language, allocated responsibilities, project evidence and applicable law determine which obligation applies and what a claimant must prove.
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