What Is a Defects Liability Period in Construction?

The Building Is Complete. But What Happens When Something Goes Wrong?

The construction work is finished.

The building has reached practical completion, the keys have been handed over and the occupants are beginning to move in.

But three months later, a problem appears.

A door isn't closing properly. A roof begins to leak. The heating system isn't performing as expected.

Who is responsible for putting these issues right?

This is where the defects liability period becomes important.

In construction, the defects liability period provides a contractual process for identifying and rectifying certain defects that become apparent after practical completion.

For building owners, developers, contractors and facilities managers, understanding how this period works is essential.

It helps establish how defects should be reported, who is responsible for addressing them and what happens before the construction project is formally closed out.

What Is a Defects Liability Period?

A defects liability period is a specified period following practical completion during which the contractor may be required to return and rectify defects in accordance with the construction contract.

The term is commonly used across the construction industry, although some standard forms of contract, including JCT contracts, use the term 'rectification period'.

The purpose is to provide a structured opportunity for defects to be identified and addressed after the building has been handed over.

Not every defect becomes apparent during construction.

Some problems only emerge once a building is occupied and its systems are being used regularly.

For example, a heating system may appear to operate correctly during commissioning but reveal performance issues during colder weather.

Similarly, a roof may not show signs of leaking until it experiences prolonged heavy rainfall.

The defects liability period provides a mechanism for dealing with qualifying defects under the terms of the contract.

However, it is important to understand that the period is not a general warranty covering every problem that might occur.

The contractor's obligations depend on the construction contract, the nature of the defect and the circumstances in which it arose.

How Long Is the Defects Liability Period in the UK?

A defects liability period commonly lasts between six and twelve months, although the actual duration depends on the contract.

Twelve months is frequently used for building projects, but shorter or longer periods may be agreed.

There is no single statutory defects liability period that automatically applies to every UK construction project.

Instead, the relevant construction contract normally specifies the duration and the procedures to be followed.

Different arrangements may apply to particular elements of the works or to contracts using different standard forms.

This makes it important for building owners and contractors to review the agreed contractual provisions rather than assume that the period will always last twelve months.

When Does the Defects Liability Period Start?

The defects liability period generally begins at practical completion, as defined by the construction contract.

Practical completion is a significant milestone in a construction project.

It typically indicates that the works have reached the stage required by the contract for the employer to take possession, subject to any outstanding minor items or defects that do not prevent practical completion.

At this point, several important changes may occur.

Depending on the contract:

• The employer may take possession of the completed works.
• Responsibility for certain risks may change.
• Part of the retention money may become payable.
• The defects rectification process begins.
• The building enters its operational phase.

Practical completion does not necessarily mean that every item of work is entirely free from defects.

Instead, the contract establishes the process for dealing with outstanding matters and defects that become apparent afterwards.

What Types of Defects Might Be Identified?

Defects can affect many different parts of a completed building.

Some are relatively minor, while others may have significant implications for building performance, safety or usability.

Common examples include:

Building Fabric Defects

These might include leaking roofs, defective window seals, damaged finishes, water ingress or problems with external cladding.

Mechanical and Electrical Defects

Examples include faulty ventilation equipment, heating systems that fail to achieve the required performance, electrical faults or incorrectly operating controls.

Doors, Windows and Internal Finishes

Problems may include doors that do not close properly, damaged flooring, defective ironmongery or poorly finished surfaces.

Plumbing and Drainage

Defects may involve leaking pipework, drainage problems, faulty fittings or equipment that has not been installed correctly.

Fire Safety Systems

Defects might also be identified in fire doors, alarm systems, emergency lighting or other fire safety measures.

Any potentially serious fire safety issue should be addressed promptly through the appropriate safety and contractual procedures rather than waiting for a routine defects inspection.

Not every problem reported during the defects liability period will necessarily be the contractor's responsibility.

Issues caused by misuse, accidental damage, inadequate maintenance or ordinary wear and tear may fall outside the contractor's contractual rectification obligations.

Each issue should be assessed against the contract and the available evidence.

What Is the Difference Between Snagging and Defects?

The terms 'snagging' and 'defects' are often used interchangeably, but they can describe different stages of the construction process.

Snagging generally refers to identifying minor incomplete or defective items, often towards the end of construction or around practical completion.

A snagging list might include damaged paintwork, poorly fitted doors, missing fittings or unfinished decorative work.

Defects identified after practical completion may include problems that were not apparent during the original inspections.

For example, a door that was visibly damaged before handover might appear on a snagging list.

A ventilation system that develops a fault after several months of normal operation may be reported during the defects liability period.

The distinction is not always absolute, and the treatment of individual items depends on the contract.

However, keeping clear records of both snagging items and post-completion defects can help avoid confusion about when an issue was identified and how it should be resolved.

Who Is Responsible for Fixing Defects?

Under many construction contracts, the main contractor is responsible for making good defects covered by the contractual rectification provisions.

Where the defective work was carried out by a subcontractor, the main contractor may arrange for that subcontractor to return and undertake the necessary repairs.

However, the contractual relationship is important.

The building owner or employer will generally have a contract with the main contractor rather than directly with every subcontractor involved in the project.

The main contractor may then have separate contractual arrangements with its subcontractors.

The exact responsibilities depend on the contract structure and the relevant terms.

For building owners, this makes it important to establish a clear process for reporting defects and communicating with the appropriate party.

How Should Defects Be Reported?

A clear defects reporting process helps ensure that issues are properly recorded and addressed.

When a defect is identified, the record should ideally include:

• The location of the problem
• A description of the issue
• The date it was discovered
• Photographs or other supporting evidence
• The affected building element or asset
• Any immediate safety concerns
• The person or organisation responsible for investigating it
• The action taken to resolve the problem
• The date the work was completed

The contract may specify how defects must be notified, who has authority to issue instructions and whether particular notices are required.

These procedures should be followed carefully.

For example, simply emailing a subcontractor may not satisfy the formal notification requirements under the main construction contract.

A structured record also helps distinguish between newly reported defects, outstanding snagging items and routine maintenance issues.

What Happens During the Defects Liability Period?

Although the precise procedure depends on the contract, the process commonly involves several stages.

1. Defects Are Identified

The building owner, facilities management team, occupants or other relevant parties identify problems with the completed works.

Some defects become apparent through everyday use.

Others may be discovered during inspections or planned maintenance activities.

2. The Issues Are Recorded

Each defect is documented with sufficient detail to explain the problem and its location.

Supporting photographs, drawings and equipment information can be particularly useful.

3. Responsibility Is Assessed

The relevant contract administrator, employer's agent or other authorised party considers whether the issue falls within the contractor's rectification obligations.

The nature of the defect and the terms of the contract will determine the appropriate response.

4. Rectification Work Is Arranged

Where the contractor is required to make good the defect, the necessary work is organised.

This may involve returning to an occupied building, arranging access or coordinating with specialist subcontractors.

5. Completed Work Is Checked

Once the rectification work has been carried out, the relevant party checks whether the defect has been satisfactorily addressed.

The record can then be updated to show the outcome.

6. A Final Review Takes Place

Towards the end of the period, the contract administrator or other relevant party may undertake a further inspection and identify any remaining defects requiring attention.

The applicable contract determines how these are notified and dealt with.

What Happens When the Defects Liability Period Ends?

The end of the defects liability period is another important milestone.

Under many contracts, a final inspection or review takes place to identify outstanding defects that need to be addressed.

Where the contractor has completed the required rectification work, the contract administrator may issue a certificate confirming that the defects have been made good.

Under JCT contracts, this is commonly referred to as the Certificate of Making Good.

This certificate is important because it records that the relevant contractual rectification obligations have been completed.

It may also have implications for the release of retention money and other contract administration procedures.

However, the certificate does not necessarily mean that the contractor can never be responsible for any further defect.

That is a separate legal question.

Can a Contractor Still Be Liable After the Defects Liability Period?

Yes.

A common misconception is that once the defects liability period has ended, the contractor has no further responsibility for defective work.

That is not necessarily correct.

The defects liability period is a contractual mechanism for identifying and rectifying defects during a specified period.

It is not automatically the final deadline for bringing every possible claim relating to defective construction work.

Depending on the circumstances, a contractor may still face claims for breach of contract or other applicable legal obligations after the period has expired.

For example, a latent defect is one that was not reasonably apparent at the time of inspection or handover.

Such defects may only become evident years after the building has been completed.

Whether a claim can be brought will depend on factors including the contract, the nature of the defect, the applicable limitation period and any relevant legislation.

In England and Wales, contractual limitation periods are commonly six years for simple contracts and twelve years for contracts executed as deeds, although important exceptions and different rules may apply.

Certain residential building safety claims may also be subject to separate statutory provisions.

Building owners should therefore avoid assuming that the expiry of a twelve-month rectification period removes every possible legal remedy.

What Is a Certificate of Making Good Defects?

A Certificate of Making Good is a document issued under certain construction contracts, including JCT forms, to confirm that defects covered by the relevant rectification provisions have been made good.

It is typically issued by the contract administrator once the required work has been completed.

The certificate may be relevant to the release of the remaining retention money and the administration of the final account.

However, it should not be confused with the original certificate of practical completion.

Practical completion marks an earlier contractual milestone.

The Certificate of Making Good relates to the completion of the applicable defects rectification process.

The precise terminology and effect depend on the contract being used.

Why Good Building Information Matters During the Defects Liability Period

Once a building is occupied, identifying and resolving defects can become more complicated.

The original construction team may no longer be on site.

Specialist subcontractors may be working on other projects.

Facilities managers may be unfamiliar with the building's systems and installation details.

This is where accurate handover information becomes particularly valuable.

For example, if an air handling unit is not operating correctly, the facilities management team may need to locate:

• The equipment's specifications
• Commissioning information
• Relevant installation drawings
• Manufacturer instructions
• Warranty information
• Maintenance requirements
• Records of previous inspections or repairs

Having access to this information can help establish what was installed, how it was intended to operate and whether the issue relates to defective work or subsequent operation.

The same principle applies to building fabric, plumbing, electrical systems and other assets.

When information is difficult to locate, even relatively straightforward investigations can take longer than necessary.

The Role of Facilities Managers

Facilities managers are often among the first people to identify problems after a building has been occupied.

They may receive reports from occupants, investigate equipment faults or discover defects during routine inspections.

However, their role is not simply to arrange repairs.

During the defects liability period, it is important to distinguish between issues that should be reported through the construction contract and those that fall within normal building maintenance responsibilities.

For example, arranging a third-party repair without first considering the contractual process could complicate the allocation of responsibility or recovery of costs.

At the same time, urgent safety issues must be managed promptly.

Facilities teams therefore need a clear understanding of the defects reporting procedure, relevant contacts and the documentation available for the building.

How Liaison View Can Help

Liaison's View platform helps building owners, contractors and facilities management teams organise and access building information.

This includes O&M manuals, drawings, asset information and other important handover documentation.

During the defects liability period, access to reliable building records can help teams investigate reported issues and understand the systems involved.

Rather than searching through separate folders, emails or physical manuals, users can access relevant building information from a central location.

This can be particularly useful when locating equipment specifications, checking installation details or reviewing maintenance instructions.

View also provides search capabilities designed to make building documentation easier to find.

Although View does not replace the contractual defects rectification process, it can support the practical management of the information needed when investigating and resolving issues after handover.

And because building information remains useful beyond the defects liability period, maintaining organised records can support the building throughout its operational life.

A Practical Defects Liability Period Checklist

For building owners and facilities managers approaching practical completion, the following checklist can help prepare for the defects liability period.

• Confirm the length of the defects liability or rectification period in the contract.
• Identify the date the period begins and ends.
• Establish who is authorised to receive and issue defect notifications.
• Agree how defects should be reported and recorded.
• Obtain relevant O&M manuals and as-built drawings.
• Ensure equipment and system information is accessible.
• Keep records of outstanding snagging items.
• Record new defects with dates, locations and supporting evidence.
• Distinguish between contractual defects and routine maintenance issues.
• Follow the agreed procedures for notifying the contractor.
• Monitor outstanding rectification work.
• Arrange the appropriate end-of-period inspection or review.
• Confirm that required defects have been addressed.
• Retain the relevant certificates and correspondence.

This is a practical guide rather than a substitute for the procedures set out in the construction contract.

Conclusion

Practical completion is a major milestone, but it doesn't always mark the end of a contractor's responsibilities.

The defects liability period provides a structured process for identifying and rectifying certain defects after construction work has been completed.

For building owners and facilities managers, understanding the period is important for protecting the building, managing repairs and ensuring that problems are addressed through the appropriate contractual process.

Clear communication, accurate records and accessible building information can make the process more manageable.

And while the defects liability period may last only six or twelve months, the building itself will be expected to perform for many years afterwards.

Getting the post-completion process right helps establish a stronger foundation for that longer operational life.