Collection: Security Rated Grilles

Security rated grilles are available in several configurations depending on the type of opening, operational requirements, and security level required. All systems are tested to LPS 1175, providing independently verified resistance to forced entry.

LPS 1175 Fixed Window Bars (Up to Security Level 4)

Heavy duty steel bar systems permanently installed over window openings.

• Solid steel bar construction
• Reinforced perimeter frame
• Anti tamper fixings

Security Rating:

• Up to LPS 1175 Security Level 4
• Secured by Design

Typical Applications:

• Ground floor windows
• Schools and public buildings
• Utilities and infrastructure sites
• Police and MOD sites

Provides one of the highest levels of window protection.

Security Mesh Window Grilles (Up to Security Level 3–4)

• Welded steel mesh panels installed over window openings.
• Reinforced mesh design
• Maintains visibility and airflow
• Strong perimeter framing

Security Rating:

• Up to LPS 1175 Security Level 3 depending on specification.

Typical Applications:

• Offices and commercial buildings
• Plant rooms and service areas
• Industrial facilities

Mesh systems provide strong security while maintaining light and ventilation.

LPS 1175 Retractable Security Grilles (Up to Security Level 3)

Collapsible steel lattice grilles that slide open when access is required.

• Single stack or bi-parting operation
• Fully tracked or trackless options
• Lockable multi point systems

Security Rating:

• Up to LPS 1175 Security Level 3

Typical Applications:

• Doorways and shopfronts
• Reception areas
• Internal compartmentation

Retractable grilles offer certified protection while maintaining operational flexibility.

Internal Security Compartmentation Grilles

Security rated grilles used to protect internal areas such as:

• Server rooms
• Archive storage
• Cash offices
• Restricted service areas

These systems help protect sensitive areas without creating enclosed environments.

Security rated grilles therefore range from permanent high security window bars to flexible retractable systems, allowing building owners to select the appropriate LPS 1175 security level for their risk profile.

Security rated grilles can be customised to suit the required LPS 1175 security level, opening size, building design, and operational requirements. Because certification applies to the full system, including fixings and locking methods, customisation must remain within the tested specification.

Security Level Selection

Security rated grilles are available at different LPS 1175 security levels, allowing the protection level to match the site risk.

• Security Level 1–2 – protection against opportunist attacks
• Security Level 3 – higher resistance to forced entry using more advanced tools
• Security Level 4 – heavy duty protection for higher-risk sites

Your choice of level influences the bar thickness, mesh strength, frame reinforcement, and locking systems.

Made to Measure Sizes

Security grilles are manufactured to suit specific openings.

• Custom width and height
• Suitable for single windows, multiple windows, or door openings
• Designed to fit within reveal or face fixed to the structure

Accurate sizing ensures the grille maintains its tested security performance.

Grille Construction Type

Different constructions are available depending on the application.

• Solid steel window bars for maximum strength
• Welded steel mesh panels where visibility and airflow are required
• Retractable lattice grilles for doorways and larger openings

Each construction type is tested to a specific security level.

Locking Systems

Retractable security grilles can include:

• Multipoint locking systems
• High-security keyed cylinders
• Reinforced locking bars
• Anti-tamper locking housings

Locks must match the certified security rating.

Finish and Appearance

Security rated grilles can be finished to suit the building façade.

• Polyester powder-coated finish
• Wide range of RAL colours
• Galvanised finishes for corrosion resistance
• External or internal installation options

This allows the grille to blend with window frames or building design.

Installation Method

Installation options include:

• Face fixing to the external wall
• Reveal fixing within the window recess
• Internal installation where a discreet appearance is required

For LPS 1175 certified systems, the fixing method must match the tested installation detail.

Additional Options

• Anti tamper fixings
• Reinforced perimeter frames
• Custom bracket designs for non standard structures

Security rated grilles can therefore be tailored in size, configuration, finish, and security level, while maintaining compliance with the LPS 1175 certification standard and ensuring the system performs as tested

Security rated grilles are specified where enhanced physical protection is required, particularly in environments where assets, infrastructure, or sensitive information must be protected against forced entry. Because they are tested to LPS 1175, they are commonly used in locations where certified security performance is required by insurers, security consultants, or government standards.

Commercial Buildings

Installed on:

• Ground floor office windows
• Rear service entrances
• Server rooms and IT areas
• Secure storage rooms

Provides certified protection while maintaining visibility and ventilation.

Schools & Educational Facilities

Used to protect:

• Classrooms
• IT suites and computer rooms
• Laboratories
• Sports and community buildings

Security rated grilles help prevent vandalism and theft of equipment.

Utilities & Critical Infrastructure

Specified for:

• Substations
• Telecommunications buildings
• Water treatment facilities
• Energy infrastructure

These sites often require LPS 1175 security levels to protect critical national infrastructure.

Industrial & Warehouse Facilities

Installed on:

• Warehouse windows
• Plant rooms
• Machinery control areas
• Loading yard offices

Provides heavy-duty protection in environments with valuable equipment or materials.

Government & Public Sector Buildings

Security rated grilles are commonly used in:

• Government offices
• Public administration buildings
• Courts and municipal facilities

They help secure vulnerable windows while maintaining building functionality.

Ministry of Defence (MOD) Sites

Often specified for:

• Military facilities
• Storage buildings
• Training centres
• Secure compounds

LPS 1175 systems may be required to meet MOD physical security standards.

Police Facilities

Installed in:

• Police stations
• Evidence storage rooms
• Vehicle depots
• Secure administration areas

Security rated grilles help protect sensitive materials and operational facilities.

High Risk Residential Properties

Used in:

• Luxury homes
• Isolated properties
• Properties requiring insurer approved security measures

Higher security levels may be recommended following risk assessments.

Security rated grilles are therefore used across commercial, infrastructure, government, MOD, and police environments, where certified protection against forced entry is required and security must meet recognised industry standards such as LPS 1175.

Security rated grilles provide independently tested protection against forced entry, offering a higher level of assurance than standard security products. Their design focuses on strength, certification, and long-term durability.

Independently Tested Security

Security rated grilles are tested to LPS 1175 standards by the Loss Prevention Certification Board (LPCB).

Benefit: Provides verified resistance to forced entry using tools and attack methods commonly used by intruders.

Graded Security Levels

Available at different security levels (e.g. Level 1–4) depending on the required protection.

Benefit: Allows security to be specified according to the risk level of the building, insurer requirements, or security consultant recommendations.

Heavy Duty Steel Construction

Manufactured from reinforced steel bars or welded steel mesh within strengthened perimeter frames.

Benefit: Provides strong resistance to cutting, levering, and impact attacks.

Anti Tamper Fixings

Installed using reinforced anchors and concealed or protected fixings.

Benefit: Prevents the grille from being removed or bypassed from the outside.

Maintains Visibility and Ventilation

Mesh and bar grille designs allow light and airflow to pass through the opening.

Benefit: Maintains natural light and ventilation while still providing security.

Operational Flexibility

Retractable security rated grilles can slide open when access is required.

Benefit: Allows normal building operation while providing security outside working hours.

Custom Finishes

Available in polyester powder coated finishes across a wide RAL colour range.

Benefit: Allows the grille to match window frames or building façades.

Durable and Low Maintenance

Heavy duty materials and protective coatings ensure long service life.

Benefit: Requires minimal ongoing maintenance compared with mechanical security systems.

Made to Measure Installation

Manufactured to suit specific openings and structural conditions.

Benefit: Ensures accurate fit and maintains the tested security performance.

Security rated grilles combine certified security performance, structural strength, and practical design, making them suitable for higher risk residential, commercial, and infrastructure environments where tested protection is required.

Security rated grilles must comply with recognised security certification standards, building regulations, and life safety requirements to ensure they provide effective protection without compromising occupant safety.

LPS 1175 – Security Certification

Security rated grilles are independently tested to LPS 1175, a recognised forced-entry resistance standard developed by the Loss Prevention Certification Board (LPCB).

Testing evaluates resistance against:

• Manual attack tools
• Levering and cutting attempts
• Forced removal of the grille
• Weak points such as locks and fixings

Each security level (Level 1–4 and above) represents increasing resistance to attack.

To maintain certification:

• The grille must be installed using the tested fixing method
• Approved locking systems must be used

Installation must follow manufacturer specifications.

Secured by Design (SBD)

Certain security rated grille systems can also support Secured by Design (SBD) specifications.

Secured by Design is the official police security initiative that promotes the use of tested security products to reduce crime in residential and commercial developments.

Products that meet LPS 1175 certification are often used within SBD projects because they provide independently verified security performance.

These systems are commonly specified in:

• New residential developments
• Social housing projects
• Public buildings
• Police or government facilities.

Structural Installation Requirements

Security rated grilles must be securely installed into structural building elements.

Requirements include:

• Fixing into brick, concrete, steel, or structural timber
• Use of anti-tamper anchors and reinforced fixings
• Correct fixing centres and frame support.

Improper installation can invalidate the security certification.

Fire Safety and Means of Escape (Approved Document B)

If installed over windows or doors that form part of an escape route, the grille must not prevent safe evacuation.

Key considerations include:

• Escape windows must remain usable where required
• Grilles protecting escape routes may require internal release mechanisms

Security must never compromise life safety.

Accessibility Considerations (Approved Document M)

Where grilles protect accessible entrances or internal routes:

• They must not reduce compliant access widths
• Trackless systems may be required where bottom tracks could create trip hazards.

Durability and Environmental Protection

External security rated grilles should include:

• Galvanised or corrosion-resistant materials
• Weather resistant fixings
• Powder coated finishes for long-term durability.

When correctly specified and installed, security rated grilles provide certified protection under LPS 1175, can support Secured by Design requirements, and remain compliant with building regulations covering structural safety, fire escape, and accessibility.

Security rated grilles must be installed in accordance with the tested LPS 1175 certification specification to ensure the system performs as designed. Both the grille construction and the installation method contribute to the certified security performance.

Installation Requirements

Structural Fixing

Security rated grilles must be securely installed into structural building elements.

Installation requirements include:

• Fixing into brick, concrete or structural steel.
• Use of reinforced anti tamper fixings
• Correct fixing centres as specified in the certification
• Installation into a structurally sound opening

Improper installation can invalidate the LPS 1175 certification.

Internal vs External Installation

The installation position depends on the grille type.

Retractable Security Grilles

• Must be installed internally to maintain LPS 1175 certification
• External installation will normally invalidate the security rating
• Internal installation protects the locking mechanism and guides from attack

Fixed Window Bars & Mesh Security Grilles

• Can be installed internally or externally
• External installation provides a visible security deterrent
• Internal installation provides a more discreet appearance

The fixing method must still follow the tested installation detail.

Alignment and Fit

To maintain security performance:

• Frames must be installed level and square
• Minimal perimeter gaps should be maintained
• Fixings must be concealed or protected where specified
• Locking systems must fully engage

Poor alignment can reduce the system’s resistance to attack.

Locking and Security Hardware

For retractable security grilles:

• Locking systems must be installed as per certification
• Cylinders and locking points must be correctly aligned
• Anti tamper locking housings must remain protected

Escape and Life Safety Considerations

Where grilles protect windows or doors that form part of a means of escape:

• Escape routes must not be obstructed
• Internal release mechanisms may be required
• Installation must comply with Approved Document B

Security must never compromise safe evacuation.

Maintenance Requirements

Security rated grilles are generally low maintenance, but regular inspection is recommended to ensure ongoing security performance.

Routine Inspection (Annually Recommended)

Check for:

• Secure fixings
• Frame stability
• Signs of corrosion or damage
• Lock operation and alignment
• Mesh or bar integrity

Higher-risk environments may require 6-monthly inspections.

Retractable Grille Maintenance

Retractable systems require additional maintenance:

• Keep top and bottom tracks clear of debris
• Lightly lubricate pivot points and locking mechanisms
• Check smooth operation of sliding sections
• Ensure locks fully engage
• Avoid excessive lubrication, which can attract dirt.

External Systems Maintenance

For externally installed bars or mesh grilles:

• Inspect powder-coated or galvanised finish
• Touch up any damaged coating
• Check for corrosion
• Ensure fixings remain tight

Maintaining Certification

To maintain the LPS 1175 security rating:

• Do not modify the grille or frame
• Use approved replacement components
• Ensure installation method remains unchanged

When installed and maintained correctly, security rated grilles provide long-term certified protection while maintaining compliance with LPS 1175 standards, building regulations, and life safety requirements.

(Indicative UK pricing – excludes VAT unless stated)

Security rated grilles are priced based on the LPS 1175 security level, grille type (fixed bars, mesh panels, or retractable), opening size, and installation requirements. Higher security levels require heavier materials, reinforced frames, and certified fixing methods.

LPS 1175 Security Level 1

Protection against opportunist attacks using minimal tools.

Typical applications: low risk commercial sites or residential security upgrades.

• Supply only: From £500 – £900 per opening
• Supplied and installed: From £800 – £1,400 per opening

LPS 1175 Security Level 2

Higher resistance against forced entry using more capable tools.

Typical applications: offices, schools, and commercial premises.

• Supply only: From £875 – £1,500 per opening
• Supplied and installed: From £1,375 – £2,375 per opening

LPS 1175 Security Level 3

Heavy duty protection designed to resist sustained attack.

Typical applications: retail premises, warehouses, utilities, and infrastructure.

• Supply only: From £1,125 – £2,000 per opening
• Supplied and installed: From £1,750 – £3,000 per opening

Retractable security grilles certified to Level 3 are commonly used across doorways and internal openings.

LPS 1175 Security Level 4

Very high resistance to forced entry using advanced tools.

Typical applications: critical infrastructure, government buildings, and high risk commercial environments.

• Supply only: From £1,500 – £2,750 per opening
• Supplied and installed: From £2,250 – £4,375+ per opening

Typically supplied as fixed steel window bars or reinforced mesh systems.

What Affects Final Pricing

Several factors influence the final cost:

• Opening width and height
• Type of grille (bars, mesh, or retractable)LPS 1175 security level required
• Powder coated finish or galvanising
• Internal vs external installation
• Structural fixing requirements
• Access and installation complexity

Getting an Accurate Quote

Security rated grilles are made to measure and must be installed using the tested fixing specification to maintain LPS 1175 certification. Final pricing depends on the exact opening size, required security level, and installation conditions. A site survey is recommended to confirm compliance requirements and provide an accurate quotation.