Authorised Personnel Only Signs: UK Workplace Guide

Authorised Personnel Only signs help businesses make it clear that access to a particular area is restricted to approved people.

You'll commonly find them at plant rooms, machinery areas, warehouses, factories, construction sites, electrical rooms and other parts of a workplace where unrestricted access isn't appropriate.

But what does “authorised personnel” actually mean? When should you use this wording rather than No Entry, No Unauthorised Access or Staff Only? And where should the sign be positioned?

This guide explains how to choose and use Authorised Personnel Only signs in UK workplaces.

What Does Authorised Personnel Only Mean?

Authorised Personnel Only means that entry is restricted to people who have been given permission to access an area.

Exactly who is authorised will depend on the workplace and activity.

This could include:

• Trained employees

• Maintenance engineers

• Machine operators

• Technicians

• Supervisors

• Approved contractors

• Site workers

• Other designated personnel

An Authorised Personnel Only sign doesn't necessarily mean that an area is closed.

Instead, it communicates that permission or appropriate authorisation is required before entering .

When Should You Use an Authorised Personnel Only Sign?

Consider this type of sign where some people need legitimate access to an area but unrestricted entry isn't appropriate.

For example, a business may need to restrict access because an area contains machinery, electrical equipment or operational processes.

In other situations, access might be controlled for security or operational reasons.

The key question is:

Can some people enter, but only if they're authorised?

If the answer is yes, Authorised Personnel Only may be an appropriate message.

Where Are Authorised Personnel Only Signs Used?

These signs can be found across many different workplace environments.

Typical locations include:

• Plant rooms

• Electrical rooms

• Machinery areas

• Factories

• Warehouses

• Workshops

• Construction sites

• Maintenance areas

• Loading areas

• Storage areas

• Laboratories

• Industrial premises

• Service areas

• Restricted staff areas

The reason for restricting entry will vary, so the sign should reflect the actual access arrangements at the location.

Authorised Personnel Only Signs for Plant Rooms

Plant rooms can contain boilers, pumps, electrical installations, mechanical equipment and other systems that shouldn't necessarily be accessible to everybody.

An Authorised Personnel Only sign at the entrance can help communicate that access is controlled.

Where specific hazards are present, appropriate warning or mandatory signage may also be needed.

These signs communicate different things.

Authorised Personnel Only explains who may enter .

A warning sign identifies a hazard .

A mandatory sign can explain an action that must be taken , such as wearing particular PPE.

Don't assume one sign replaces another.

Authorised Personnel Only Signs for Electrical Areas

Electrical switch rooms and other controlled electrical areas may require restricted access.

An Authorised Personnel Only or No Unauthorised Access sign can communicate the access restriction.

Where an electrical hazard also needs to be identified, suitable electrical warning signage may be required separately.

This distinction helps avoid trying to make one sign communicate several unrelated instructions.

Authorised Personnel Only Signs for Machinery Areas

Factories, workshops and other industrial premises can contain machinery that should only be approached or operated by trained or approved people.

An Authorised Personnel Only sign can help reinforce the boundary of a controlled area.

However, signage shouldn't be treated as a replacement for machine guarding, barriers, safe systems of work, training or other necessary safety measures.

Authorised Personnel Only Signs for Warehouses

Warehouses can combine pedestrians, workplace vehicles, loading operations, storage systems and machinery.

Some areas may therefore need controlled access.

Examples might include:

• Plant rooms

• Maintenance areas

• Machinery zones

• Loading areas

• Restricted storage

• Equipment rooms

• Operational areas

Before choosing Authorised Personnel Only, check whether a more specific restriction would be clearer.

For example, if the rule applies specifically to pedestrians, a No Pedestrians sign may communicate the instruction more precisely.

Authorised Personnel Only Signs for Construction Sites

Construction sites need effective arrangements to prevent unauthorised people entering areas where they shouldn't be.

Depending on the site, Authorised Personnel Only signs may be displayed at:

• Site entrances

• Gates

• Temporary fencing

• Hoarding

• Compounds

• Plant areas

• Restricted work zones

However, a sign alone doesn't physically prevent access.

Where fencing, gates, barriers or other access controls are necessary, signage should support those measures rather than replace them.

Authorised Personnel Only vs No Unauthorised Access

These messages communicate a very similar access rule but approach it from opposite directions.

Authorised Personnel Only focuses on the people who may enter .

No Unauthorised Access focuses on the people who must not enter .

Imagine an engineering plant room.

If access is restricted to trained engineers, either message might potentially communicate the arrangement.

The better choice is the one that makes the site's access rule clearest to the people approaching.

Authorised Personnel Only vs No Entry

These messages shouldn't automatically be treated as interchangeable.

No Entry tells somebody not to enter or proceed beyond a particular point.

Authorised Personnel Only indicates that some approved people can still enter.

If nobody should use a particular entrance, No Entry may be appropriate.

If engineers, operators or designated employees regularly need access, Authorised Personnel Only may describe the restriction more accurately.

Ask:

Is entry prohibited, or is entry controlled?

That distinction can make choosing the right sign much easier.

Authorised Personnel Only vs Staff Only

Staff Only generally indicates that employees can enter while customers, visitors or members of the public shouldn't.

Authorised Personnel Only can describe a narrower group.

For example:

A shop stockroom that all employees can access might use Staff Only .

A plant room that only trained maintenance employees can enter might use Authorised Personnel Only .

Not every employee is automatically an authorised person for every restricted area.

What About No Admittance Signs?

No Admittance is another access-control message you may encounter.

It can be used on its own or as part of a more specific instruction such as:

No Admittance – Authorised Personnel Only

Again, choose wording that accurately describes what somebody approaching the area is expected to do.

Don't use several signs communicating essentially the same restriction simply because they're available.

Are Authorised Personnel Only Signs a Legal Requirement?

There isn't a blanket UK requirement stating that every restricted workplace area must display a sign containing the exact words “Authorised Personnel Only” .

The appropriate safety signage depends on the risks and circumstances at the workplace.

Under the Health and Safety (Safety Signs and Signals) Regulations 1996 , employers must use safety signs where a significant risk to health and safety remains after other appropriate measures have been taken.

The Regulations include No Access for Unauthorised Persons as an example of a prohibition sign.

This is an important distinction.

The law doesn't simply say:

“Every restricted area must display an Authorised Personnel Only sign.”

Instead, businesses need to assess their risks and use appropriate controls and safety signage where required.

Is Authorised Personnel Only a Prohibition Sign?

Care is needed here because the wording used on commercial signs can vary.

Where a safety sign is communicating that unauthorised people are prohibited from entering , the restriction can be represented using recognised prohibition-sign conventions.

Prohibition safety signs use the familiar red circular format with a diagonal bar.

However, not every sign containing the words “Authorised Personnel Only” should automatically be described as an ISO 7010 prohibition sign simply because it controls access.

When buying safety signage, consider the actual instruction being communicated and whether a recognised safety-sign design applies.

Do Authorised Personnel Signs Have to Be Blue?

No. It's misleading to say that all Authorised Personnel Only signs must have a blue background.

Blue circular safety signs are associated with mandatory actions .

Access restrictions can instead involve prohibition signage, supplementary text or other sign formats depending on the message being communicated.

Rather than choosing a sign because of its colour, start with the instruction:

Who is allowed to enter, and who isn't?

Then select signage that communicates that restriction appropriately.

What About ISO 7010?

ISO 7010 standardises graphical safety symbols so that important safety messages can be recognised consistently.

However, businesses should avoid assuming that every sign containing safety-related wording is automatically an ISO 7010 safety sign .

For authorised-access signage, the relevant design depends on the message.

Where you're using a recognised prohibition pictogram, an appropriate standardised design can help make the restriction immediately recognisable.

Supplementary wording can then provide additional context where required.

When buying a sign, check the specification of the individual product rather than relying on a blanket compliance statement covering an entire collection.

Safety Signs Shouldn't Replace Other Controls

An Authorised Personnel Only sign communicates an access rule.

It doesn't physically control access.

Depending on the risks, other measures might include:

• Locked doors

• Gates

• Fencing

• Barriers

• Machine guarding

• Access-control systems

• Permit systems

• Employee training

• Safe systems of work

• Visitor procedures

• Supervision

For example, placing an Authorised Personnel Only sign next to dangerous machinery wouldn't make unrestricted access adequately controlled if guarding or another physical measure was necessary.

Safety signage should support the wider arrangements in place.

Where Should Authorised Personnel Only Signs Be Positioned?

Position signs where people can see the access restriction before entering the controlled area .

Suitable locations can include:

• Doors

• Doorways

• Gates

• Fences

• Barriers

• Site hoarding

• Entrances to operational areas

Think about the normal line of sight of somebody approaching.

Avoid positioning a sign where it can be hidden by an open door, stacked stock, machinery, parked vehicles or other obstructions.

If people can enter the controlled area from several directions, consider whether the restriction is clear at each relevant access point.

How High Should the Sign Be Mounted?

There isn't one universal mounting height suitable for every Authorised Personnel Only sign.

The Health and Safety (Safety Signs and Signals) Regulations require signboards to be positioned appropriately in relation to the line of sight and potential obstacles.

In practical terms, the sign needs to be easy to notice before somebody enters.

Consider:

• The direction of approach

• Normal eye level

• Viewing distance

• Doors opening and closing

• Equipment and storage

• Other signage

• Lighting conditions

A sign that technically exists but can't easily be seen isn't communicating effectively.

What Size Authorised Personnel Only Sign Do You Need?

The appropriate size depends largely on where the sign will be displayed and how far away it needs to be recognised.

A sign on an internal plant-room door may only need to be viewed from a short distance.

A sign on an outdoor gate or construction-site boundary may need to be significantly more prominent.

Before choosing a size, consider:

• Viewing distance

• Mounting position

• Available space

• Lighting

• Visual clutter

• Indoor or outdoor location

• Direction of approach

The objective is for somebody to understand the restriction before they enter the area .

Which Material Should You Choose?

Choose the sign material according to its intended environment.

Self-Adhesive Vinyl

Self-adhesive vinyl can be suitable for clean, smooth surfaces and many indoor applications.

Rigid Plastic

Rigid plastic provides a lightweight rigid sign option for doors, walls and other suitable mounting locations.

Aluminium Composite

Aluminium composite provides a robust rigid option that can be useful for outdoor and more demanding environments.

Check the specifications of the individual sign and consider weather exposure, mounting surface and expected use before ordering.

Can Authorised Personnel Only Signs Be Used Outdoors?

Yes, provided the sign material and fixing method are suitable for the location.

For an outdoor sign, consider:

• Weather exposure

• UV exposure

• Wind

• Mounting method

• Viewing distance

• Vegetation

• Gates changing position

• Vehicles or equipment obscuring the sign

Check outdoor signs periodically to make sure they remain secure, legible and clearly visible.

Should You Add a Warning Sign?

Possibly—but only where there is a reason to do so.

Authorised Personnel Only communicates an access restriction .

A warning sign communicates a hazard .

A mandatory sign communicates an action that must be taken .

For example, a controlled machinery area could potentially require:

Authorised Personnel Only – controls access.

Warning: Machinery Hazard – identifies a relevant hazard.

Eye Protection Must Be Worn – communicates a mandatory PPE requirement.

The exact combination depends on the risks and arrangements at the workplace.

Avoid unnecessary sign clutter. Every sign should have a clear purpose.

How Many Authorised Personnel Signs Do You Need?

Think in terms of access points , not simply rooms or areas.

If a restricted area has one door, a single appropriately positioned sign may communicate the restriction.

If the same area can be approached through several doors, gates or routes, additional signs may be needed so that the restriction is clear from each relevant approach.

Large construction sites, factories and outdoor industrial areas deserve particular attention because controlled areas can often be approached from several directions.

Check Your Restricted Access Signs Regularly

Workplaces change.

Equipment gets moved. Stock is stacked in new places. Doors are replaced. Site layouts change. Temporary work areas appear and disappear.

Periodically check that your signs are still:

• Relevant

• Clearly visible

• Legible

• Correctly positioned

• Securely mounted

• Appropriate for the current access arrangements

Remove temporary signs when their restriction no longer applies.

Outdated signage can cause unnecessary confusion.

Authorised Personnel Only Sign Checklist

Before choosing your sign, ask:

Who is allowed to enter?
Identify the people who genuinely require access.

Who needs to stay outside?
This could include visitors, customers, members of the public, contractors or employees without the appropriate authorisation.

Would Staff Only be clearer?
Use Staff Only if the restriction simply separates employees from customers or visitors.

Would No Entry be more accurate?
Use a general prohibition if nobody should enter.

Is there a specific hazard?
Check whether appropriate warning signage is also required.

Is PPE required before entry?
Consider whether relevant mandatory signage is needed.

Where will people approach from?
Make the restriction visible at the appropriate access points.

How far away must the sign be seen?
Choose an appropriate size.

Is it going outdoors?
Choose a suitable material and fixing method.

Choosing the Right Restricted Access Message

The clearest access signage starts with one question:

Who is allowed through?

If nobody should enter, consider No Entry or Keep Out .

If people require permission , consider No Unauthorised Access .

If only specifically approved people may enter, consider Authorised Personnel Only .

If all employees can enter but customers and visitors can't, Staff Only may be clearer.

If entry requires a permit , use signage that clearly communicates the permit requirement.

If the restriction applies only to pedestrians , consider No Pedestrians .

The strongest wording isn't necessarily the best wording.

The best sign is the one that makes the actual access rule easiest to understand.

Shop Authorised Personnel Only Signs

The Sign Shed manufactures Authorised Personnel Only and restricted access signs for workplaces, warehouses, factories, plant rooms, construction sites and other controlled areas.

Choose from Authorised Personnel Only, No Unauthorised Access and related access-control messages in a range of sizes and materials for indoor and outdoor locations.

When choosing your sign, don't start with:

“Which restricted-access sign looks right?”

Start with:

“Who is allowed into this area?”

That question will usually lead you to the clearest message.