TWSTC is the CITB Temporary Works Supervisor Training Course, a one-day Site Safety Plus course for people who supervise temporary works. This guide covers who it’s for, what it teaches, how long the certificate lasts, why the course alone doesn’t make someone a competent TWS, and how an inspection app can support the role.
If you work in construction and have responsibility for supervising temporary works, you may have come across TWSTC.
TWSTC stands for Temporary Works Supervisor Training Course. It is a CITB Site Safety Plus course designed for people who have responsibility for supervising temporary works on construction sites.
Temporary works can involve significant risks, so understanding the temporary works process, risk management, communication and the responsibilities of the Temporary Works Supervisor (TWS) is an important part of effective site management.
But completing the course is only one part of becoming competent in the role. You also need appropriate knowledge, experience and organisational support to carry out your responsibilities effectively.
This guide explains what TWSTC is, who it is for, what the course covers, how long it lasts, what happens after the course and how a digital site management app such as KaelSite can help you manage the practical side of the TWS role.
TWSTC stands for Temporary Works Supervisor Training Course.
It is part of the CITB Site Safety Plus range of construction training courses.
The current CITB TWSTC is a one-day course designed for people who have responsibility for supervising temporary works. CITB states that the course can be taken in a classroom or through remote delivery.
The course focuses on the temporary works process and the role of the Temporary Works Supervisor rather than being a technical temporary works design course.
The CITB Temporary Works Supervisor Training Course helps site professionals understand the role of the TWS and the management processes surrounding temporary works.
The course covers areas including:
The role and responsibilities of a Temporary Works Supervisor
Temporary works processes
Risk management
Communication and coordination
The responsibilities of other people involved in temporary works
Legal duties
Relevant aspects of BS 5975
The importance of competency
The causes and consequences of temporary works failure
CITB describes the 4 Cs as an important part of the course:
Communication, Co-operation, Co-ordination and Competency.
These principles are particularly important because temporary works rarely involve just one person. Designers, contractors, supervisors, coordinators, engineers and other site personnel may all have responsibilities within the temporary works process.
TWSTC is aimed at people who have responsibility for supervising temporary works.
This could include site professionals working on projects involving temporary structures, excavation support, formwork, falsework, temporary access arrangements, propping or other temporary works.
CITB says there are no formal entry requirements for the course, although it recommends that learners have either around six months of construction experience, Health and Safety Awareness training, or the relevant Health, Safety and Environment test experience.
The exact suitability of an individual for the TWS role should still be determined by the organisation and project arrangements.
The current CITB TWSTC is a one-day course.
CITB states that learners must attend the full course, with the course lasting approximately 7.5 hours, including the assessment.
The course includes a multiple-choice examination.
After successfully completing the course, learners receive a CITB Site Safety Plus certificate.
The current CITB information states that the TWSTC certification lasts for five years.
To keep the certification current, the course needs to be retaken before the certificate expires.
For construction companies, this makes certificate tracking important.
It is easy to remember that someone has completed TWS training. It is much harder to remember exactly when everyone's certificates expire, especially when several supervisors, coordinators and workers are involved across multiple projects.
A digital training and certificate tracker can help make this process easier.
No — completing TWSTC alone does not automatically make someone competent to act as a TWS.
This is an important distinction.
CITB specifically states that attendance on the course does not demonstrate competency as a TWS. Competence comes from an appropriate combination of education, training and experience, with competence judged by an appropriate senior person, commonly referred to as the Designated Individual (DI).
Training is an important part of TWS competence, but it is not the entire picture.
Your organisation's temporary works procedure, project requirements, experience, responsibilities and competence arrangements also matter.
A Temporary Works Supervisor helps ensure that temporary works are properly supervised on site in accordance with the project's procedures and arrangements.
Depending on the project, responsibilities can include:
Supervising temporary works activities
Monitoring the condition of temporary works
Supporting inspections
Identifying problems or changes
Communicating issues to the appropriate people
Checking that relevant processes are being followed
Recording inspections and observations
Escalating concerns
Supporting corrective actions
Maintaining appropriate site records
The exact responsibilities should always be defined by the project's temporary works arrangements.
A TWS is not automatically responsible for every temporary works decision simply because they hold a TWSTC certificate.
Temporary works can create significant risks when they are incorrectly designed, installed, altered, loaded, inspected or used.
Potential problems can include:
Structural instability
Collapse
Overloading
Incorrect installation
Unauthorised changes
Inadequate support
Missing components
Ground movement
Poor communication
Inadequate inspection
Failure to follow the approved process
Changes in site conditions
The purpose of good temporary works management is not simply to complete paperwork.
It is about identifying and controlling risks throughout the temporary works process.
An inspection should result in a clear record.
For example, a TWS may need to record:
Date and time
Project
Location
Temporary works being inspected
Inspection findings
Photographs
Defects or concerns
Immediate actions
Person responsible for the action
Target completion date
Follow-up inspection requirements
Final status
If everything is satisfactory, the inspection should still be recorded where the project procedure requires it.
If something is wrong, the issue should be clearly communicated and managed according to the project's arrangements.
The exact response depends on the nature and severity of the issue.
A practical workflow can be:
Identify → Record → Communicate → Assess → Take appropriate action → Reinspect where required → Close
The important point is that identifying a defect should not be the end of the process.
You need to know:
What was found?
Who needs to know?
What action is required?
Who is responsible?
Has it been resolved?
Does it need another inspection?
This is where digital site management can make a major difference.
Paper forms can work, but they can become difficult to manage when a project has multiple inspections, defects and corrective actions.
A digital system can connect the inspection to the resulting issue.
For example:
TWS inspection → Defect identified → Photo attached → Person assigned → Due date → Corrective action → Follow-up inspection → Closed
Instead of having the inspection on one sheet of paper and the corrective action somewhere else, the information can remain connected.
This can make it easier for supervisors and managers to understand what is happening across a project.
Yes.
A construction inspection app can help a TWS record inspections directly from a phone or tablet.
Useful features can include:
Digital inspection checklists
Photo evidence
Defect reporting
Issue tracking
Corrective actions
Due dates
Assigned responsibilities
Inspection history
PDF reports
Offline working
Site records
For construction sites, offline capability can be particularly useful because mobile signal is not always reliable.
The best app is not necessarily the one with the most features. It is the one that makes the required site process easier to follow and produces useful records without creating unnecessary administration.
KaelSite is designed to help construction teams manage practical site workflows from a mobile device.
For a TWS, this can mean carrying out an inspection on site, recording findings, taking photographs and creating an issue without relying on separate paper forms.
A typical workflow could look like:
1. Start the inspection
Open the relevant inspection checklist on your phone.
2. Inspect the temporary works
Work through the required checks in accordance with your project procedures.
3. Record the findings
Mark items as appropriate and add notes where required.
4. Capture evidence
Take photographs directly from the site.
5. Report problems
If a defect or concern is identified, create an issue and record the relevant details.
6. Assign corrective action
Where appropriate, assign the action to the responsible person and set a target date.
7. Follow up
Return to the issue or inspection when required.
8. Produce a record
Generate a report that can be retained as part of the project's documentation.
KaelSite is a support tool. It does not replace the competent people, engineering decisions, temporary works procedures, approvals or sign-off required by a particular project.
Completing the course is a good opportunity to improve how temporary works are managed on your project.
After training, you should understand:
Your organisation's temporary works procedure
Your responsibilities as TWS
Who the Temporary Works Coordinator is
Who the Designated Individual is, where applicable
How inspections are carried out
What needs to be recorded
How problems are escalated
What documentation is required
How corrective actions are managed
When you need to stop and seek further advice
Your training should become part of your practical site work rather than simply being a certificate stored in a folder.
TWSTC and TWCTC are both CITB Site Safety Plus courses, but they are aimed at different temporary works responsibilities.
| TWSTC | TWCTC | |
|---|---|---|
| Full name | Temporary Works Supervisor Training Course | Temporary Works Co-ordinator Training Course |
| Typical role | Temporary Works Supervisor | Temporary Works Coordinator |
| Main focus | Supervision | Coordination/management |
| Current course length | 1 day | 2 days |
| Certification | 5 years | 5 years |
| Main purpose | Understanding the TWS role and temporary works processes | Understanding the TWC role and managing the temporary works process |
CITB currently lists TWSTC as a one-day course and TWCTC as a two-day course.
The roles themselves should not be confused.
A TWS generally focuses on supervising temporary works activities, while the TWC has a broader coordination and management role.
For a detailed comparison, see our guide:
TWS vs TWC: What's the Difference Between a Temporary Works Supervisor and Coordinator?
There is an important distinction between training requirements and legal competence requirements.
You should not assume that every person supervising temporary works across every construction project is universally required by law to hold a specific TWSTC certificate.
Project and organisational arrangements determine the roles, responsibilities and competence requirements.
However, appropriate training is an important part of developing competence for the TWS role.
If you have been appointed or are expected to act as a Temporary Works Supervisor, check your organisation's temporary works procedure and project requirements to understand exactly what is expected of you.
The records required will depend on the project's temporary works procedure.
Depending on the project, these could include:
Temporary works inspections
Inspection checklists
Photographs
Defect records
Corrective actions
Follow-up inspections
Relevant permits
Temporary works documentation
Training records
Competence records
Communication or escalation records
The objective is to make sure important information can be found when it is needed.
Paper records can become difficult to search, share and track.
Imagine a project with:
50 inspections
30 defects
15 corrective actions
Multiple supervisors
Several temporary works elements
Different due dates
A folder full of paper forms does not automatically tell you which issues are still open.
A digital system can provide a clearer picture.
For example:
Open inspections: 4
Open issues: 7
Overdue actions: 2
Completed inspections: 43
Follow-up inspections required: 3
This turns site records into something that can actually support day-to-day management.
If you are choosing an app for temporary works inspections, look for practical features rather than complicated software.
A useful TWS inspection app should ideally provide:
The system should work naturally on a phone or tablet.
You should be able to capture photographs while carrying out the inspection.
Reusable inspection templates can reduce repetitive paperwork.
Problems should be easy to record immediately.
The system should make it clear what needs to happen next.
Actions should be assigned and tracked.
Construction sites do not always have reliable mobile coverage.
Inspection records should be easy to export and share where required.
Previous inspections and issues should be easy to find.
Where your organisation needs to track training and certification, having this information in the same platform can reduce administration.
TWSTC is only one part of effective temporary works management.
The wider process can involve:
Planning
↓
Appointment of appropriate roles
↓
Design and checking
↓
Construction / installation
↓
Inspection
↓
Use
↓
Monitoring
↓
Changes or corrective actions
↓
Further inspection
↓
Dismantling / removal
↓
Records and close-out
The exact process depends on the project and its temporary works procedure.
The TWS needs to understand where their responsibilities fit into that wider process.
TWSTC means Temporary Works Supervisor Training Course.
Yes. TWSTC is part of the CITB Site Safety Plus training scheme.
The current course is one day, with CITB describing the course duration as approximately 7.5 hours including the examination.
The current CITB information states that TWSTC certification lasts five years.
CITB currently states that TWSTC can be delivered through classroom or remote delivery.
No. CITB specifically states that attendance does not demonstrate competence. Competence involves an appropriate combination of education, training and experience and should be judged by an appropriate senior individual.
No.
TWSTC is for the Temporary Works Supervisor role, while TWCTC is aimed at people responsible for coordinating/managing temporary works.
No.
SSSTS is the Site Supervision Safety Training Scheme, while TWSTC focuses specifically on the temporary works process and the TWS role.
Inspection responsibilities depend on the project's temporary works arrangements and procedures. A TWS may have inspection or supervision responsibilities, but the exact requirements should be established by the project.
No.
KaelSite is software designed to support site inspections, reporting, records and corrective actions. It does not replace competent personnel, engineering judgement, project procedures, approvals or required sign-off.
TWSTC is a useful training route for people who have responsibility for supervising temporary works.
But the certificate is only one part of the bigger picture.
Good temporary works management depends on competent people, effective communication, appropriate procedures, inspections, risk management and reliable records.
Once you are back on site, the challenge becomes practical:
How do you carry out inspections?
How do you record what you find?
How do you manage defects?
How do you make sure corrective actions are completed?
How do you keep your records organised?
This is where digital tools can help.
With KaelSite, construction teams can manage inspections, issues, photographs, corrective actions, reports and other site records from a mobile-first platform designed for real construction environments.
Training helps you understand the role.
Good site processes help you perform it.
And the right digital tools can make those processes easier to manage every day.
KaelSite
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