Construction involves many different types of work, and some activities need more checks before they begin.

A permit-to-work (PTW) system provides a structured way to make sure the work is understood, the necessary controls are in place, and the right people have authorized it before work starts.

Traditionally, this has meant paper forms, physical signatures and site files. Today, more contractors are moving to e-permit-to-work (ePTW) systems that bring the same process into a digital workflow.

What Is a Permit-to-Work System?

A permit-to-work system is a formal process for controlling and authorizing specific work activities.

A permit typically records:

• What work is being carried out
• Where it will happen
• Who is responsible
• What hazards need to be considered
• What controls are required
• Who needs to review or approve the work
• When the permit is valid
• When the work is completed and the permit is closed

A PTW does not make the work safe by itself, and it does not replace a risk assessment or safe work procedure. Instead, it can be part of a wider safety process that makes responsibilities, controls and approvals clear.

How does a permit-to-work process work?

While the exact workflow varies by project, a typical process looks like:

Identify the work → Assess the risks → Put controls in place → Review → Approve → Carry out the work → Close the permit

The important part is that the permit follows the activity from preparation through completion.

Types of Permit-to-Work in Construction

Different projects use different permit types depending on their work activities, risks and safety procedures. Common examples include:

Hot Work Permit

Used for work that produces heat, sparks or flames, such as welding, cutting and grinding. The process can help confirm that appropriate fire prevention and other controls are in place.

Confined Space Permit

Used where work takes place in a confined space and additional precautions may be required, such as access controls, atmospheric checks and rescue arrangements.

Work-at-Height Permit

Used by projects that require formal authorisation for work at height, with checks around fall prevention, access and other relevant controls.

Electrical Work Permit

Used to control certain electrical activities, particularly where isolation or other precautions are required.

Excavation Permit

Used for excavation work where hazards can include underground services, collapse and interaction with other site activities.

Other projects may use permits for lifting operations, hazardous substances, restricted areas or other higher-risk activities.

Not every activity needs the same permit. The permit process should reflect the actual work and the project's requirements.

Read also: Writing an Effective Risk Assessment Form

Permit-to-Work in Singapore Construction

For contractors searching for permits to work in Singapore, PTW should be understood as part of a broader Workplace Safety and Health (WSH) framework.

The Ministry of Manpower (MOM) establishes workplace safety and health requirements, including requirements and guidance around managing workplace risks.

A permit-to-work system can support these practices by providing a structured way to control specific activities.

However, there is no single PTW process that applies to every construction activity. Whether a permit is needed and what it should contain can depend on:

• The type of work and hazards involved
• Risk assessments and safe work procedures
• Applicable WSH requirements
• Project and client requirements
• The contractor's safety management system
• Main contractor or subcontractor arrangements

This makes PTW one part of a larger safety workflow rather than a standalone form. The exact requirements should always be determined according to the applicable regulations and project procedures.

What Is E-Permit-to-Work?

An e-permit-to-work system (ePTW), digitises the permit-to-work process.

Instead of creating a paper permit, physically passing it between people and filing it afterwards, the permit can be created, reviewed, approved and stored digitally.

The purpose of the permit does not change but what changes is how the information is captured and managed.

For example, a site supervisor can create a permit on a phone, attach photos or documents, and send it through the required approval process. Once completed, the permit remains part of the project's digital record.

Why Move From Paper PTW to ePTW?

Paper permits can work well for straightforward projects. The challenge often appears when there are more sites, permits, subcontractors and people involved and this is when a digital permit-to-work system can help with several practical problems.

The benefit is not simply less paper but keeping the information connected to the work it belongs to.

Faster submission and approval

Site teams can create and submit permits from the field rather than physically moving forms between people.

Clearer permit status

Teams can see whether a permit is awaiting review, approved, active or closed.

Evidence stays connected

Photos, checklists and supporting documents can be attached directly to the relevant permit.

Easier record keeping

Completed permits remain in a digital record, making them easier to retrieve when needed.

Better visibility across projects

Project managers and safety teams can have a clearer view of permit activity without collecting paper records from different sites.

What Should an ePTW System Include?

A useful e-permit-to-work system should make the existing process easier to follow, not introduce another complicated step into an already working workflow.

Depending on the project, useful capabilities can include:

• Custom permit types for different work activities
• Checklists for required pre-work checks
• Digital signatures and approvals
• Photos and supporting documents
• Permit status and validity
• Assigned responsible persons
• Centralised project records
• A clear history of approvals and actions

Most importantly, it should work for the people using it on site.

Read also: Understand What Auditors Actually Look For in a Permit-to-Work Trail And Where Most Sites Fail

A permit that is simple to complete on a phone is more useful than a digital form that requires the field team to navigate unnecessary steps.

How to Move From Paper PTW to ePTW

Contractors do not need to digitise every process at once. A practical transition can start with the permits already used regularly.

1. Map the current process

Identify who creates, checks, approves and closes each permit.

2. Identify the permit types

Start with the activities where a digital workflow would provide the clearest benefit.

3. Build the digital workflow

Create the permit forms, checklists, approval steps and required evidence.

4. Start with one project

Pilot the process with a site team before expanding it across projects.

5. Improve from actual site use

Listen to the people completing the permits. Remove unnecessary steps and adjust the workflow where it does not match how the work is actually done.

PTW Best Practices for Construction Teams

Whether your permits are paper-based or digital, a few principles remain important:

Keep permits specific.
The permit should clearly relate to the work being carried out.

Make responsibilities clear.
Everyone involved should know who requests, reviews, approves and closes the permit.

Keep evidence connected.
Photos, documents and sign-offs should remain associated with the relevant work.

Make the status clear.
People should know whether the permit is pending, approved, active or closed.

Keep the process practical.
A permit should support the work rather than create unnecessary administration.

Close permits properly.
Closing the permit creates a clear end to the activity and preserves the record.

Frequently Asked Questions

What is a permit-to-work?

A permit-to-work is a formal process used to control and authorise specific work activities before they begin. It records the work, hazards, controls, responsible people and required approvals.

What is a permit-to-work system?

A permit-to-work system is the overall process used to create, review, approve, monitor and close permits. It can be paper-based or digital.

What is e-permit-to-work?

E-permit-to-work, or ePTW, is a digital permit-to-work process that allows permits to be created, reviewed, approved, signed, tracked and stored electronically.

Is a permit-to-work required for every construction activity?

No. The need for a permit depends on the work, hazards, applicable WSH requirements, risk assessment and project-specific procedures. Contractors should follow the requirements applicable to their work and project.

Does PTW replace a risk assessment?

No. A permit-to-work and risk assessment serve different purposes and can form part of the same broader safety management process.

What are common types of permit-to-work?

Common examples include hot work, confined space, work at height, electrical work and excavation permits. Projects may use additional permit types depending on their activities.

Why use an ePTW system?

An ePTW system can make it easier to submit permits, manage approvals, attach evidence, see permit status and retrieve completed records — particularly across multiple sites.

From Permit to Proof

A permit-to-work system gives construction teams a structured way to prepare, authorise and record specific work so moving that process to e-permit-to-work does not change why the permit exists. It changes how the information moves.

That is where digital construction tools can be useful: not by adding another layer of work, but by making the work already being done easier to capture and manage.

Everything captured on site serves a purpose beyond the site. And when the technology fits the field, that information can keep working long after the permit itself is closed.