High Security Steel Doors & LPS 1175 Certified Protection

 

M Brock High Security Doors are purpose-built to safeguard commercial, industrial, and critical infrastructure environments where forced entry resistance is essential. Each door is independently tested and certified to the LPS 1175 standard, which defines rigorous levels of protection against attack using tools and mechanical force. Certified security doors provide trusted outcomes for businesses with high-value assets and elevated security needs.

 

Steel Security Doors

1.  SR2 Security Doors

Our SR2 Security Doors provide a robust and reliable barrier for environments where there is a moderate risk of unauthorised access. Designed to deter opportunist attacks, SR2 doors deliver certified protection without compromising usability or appearance.

Key Features & Benefits

    • Certified Security
      Independently tested and certified to LPS 1175 SR2, ensuring proven resistance to forced entry.

    • Targeted Attack Resistance
      Engineered to withstand attacks using opportunist hand tools for a defined period, helping to delay intrusion and protect occupants and assets.

    • Durable Construction
      Manufactured using high-strength materials to deliver long-term performance in commercial environments.

    • Ideal Applications
      Well suited for back-of-house areas, offices, plant rooms, and mid-risk commercial properties where dependable security is essential.

 

2.  SR3 Security Doors

 

For environments facing higher security threats, our SR3 Security Doors provide enhanced protection against more determined and sophisticated forced entry attempts.

Key Features & Benefits:

  • Enhanced Certification
    Certified to LPS 1175 SR3, offering increased resistance against heavier and more aggressive tool sets.

  • Maximum Protection
    Built with reinforced steel construction and advanced locking mechanisms designed to deter experienced attackers.

  • Peace of Mind
    Provides an essential layer of defence for high-risk areas, safeguarding critical infrastructure and high-value assets.

  • Ideal Use Cases
    Commonly specified for banks, government buildings, utility substations, data centres, and pharmaceutical facilities.

 

Understanding the LPS 1175 Standard

LPS1175 Level 3 Security Rated Steel Doors -… | Security Direct

LPS 1175 is a leading UK security standard developed by the Loss Prevention Certification Board (LPCB). It defines rigorous testing procedures that assess the resistance of physical security products—such as doors and shutters—against forced entry.

Products are classified into Security Ratings (SR1–SR8).
Higher ratings indicate greater resistance to prolonged and aggressive attacks using more advanced tools.

  • SR2 & SR3 – Suitable for moderate to high-risk commercial environments

  • SR4–SR6 – Designed for sites requiring the highest levels of protection

Need Higher Security? (SR4, SR5, SR6)

For sites requiring maximum protection, M Brock also supplies the M2M4 range, certified to LPS 1175 SR4, SR5, and SR6 standards. These high-security doors are engineered to resist sustained attacks by highly experienced intruders using heavy-duty tools.

They are ideal for critical national infrastructure, defence facilities, and locations with extreme security requirements.

Frequently Asked Questions – High Security Doors

What makes a door “high security”?
A high security door is engineered to resist forced entry using tools and physical force. Certified doors meet standards like LPS 1175, indicating they have been independently tested for resistance levels against specific attack types.

What do LPS 1175 SR2 & SR3 ratings mean?
SR2 doors resist opportunist tool attacks using basic hand tools, while SR3 doors withstand more aggressive attempts using heavier tools such as crowbars and drills.

Where are high security doors used?
These doors are ideal for commercial, industrial, and critical infrastructure sites — for example banks, data centres, offices, transportation hubs, and facilities storing high-value assets.

Can high security doors be customised?
Yes. Options include different locks, finishes, access control systems, and hardware tailored to your specific security require

Secure Your Premises Today

 

Don’t compromise on building security. Talk to our highly experienced team to specify the correct LPS 1175 SR2 and SR3 certified doors for your property. Whether you are replacing an existing door or specifying a new installation, our team is here to help with expert advice, measurements, and custom configurations – We also supply a range of steel fire exit doors, personnel doors, louvred doors well as full steel door sets for larger commercial openings