LPS 1175 Security Ratings Explained: Certified Doors, Windows and Gates for UK Buildings

Premier Security Ballistic & Blast Ltd designs and manufactures LPCB certified LPS 1175 security doorsets, screens, windows, gates and curtain walling, with certified ratings from SR2 through to E10 (SR5) under the LPCB certificate 1097 series.

As a Secured by Design accredited manufacturer of bespoke high-security products, we work with architects, main contractors and security consultants to make sure every product matches the rated performance in their specification. With over 30 years of experience, our certified range is trusted by government, defence, critical infrastructure, residential and commercial clients across the UK and internationally.

Our LPS 1175 Certified Products

Browse our range of LPCB certified LPS 1175 security products. Each product page covers the certified ratings, specifications and application guidance.

What Is LPS 1175?

LPS 1175 (Loss Prevention Standard 1175) is the UK's leading standard for testing and certifying the forced entry resistance of physical security products. It is developed and maintained by the Loss Prevention Certification Board (LPCB), part of BRE Global, and is widely regarded as one of the most rigorous forced entry standards in the world.

The standard tests how long a security product, including the door, frame, glazing, locks, hinges and fixings as a complete assembly, can resist a determined attack using defined categories of tools. Products must withstand the attack for a specified minimum delay without an attacker creating an opening of 400 mm x 225 mm, the minimum size a person can pass through. The test is carried out with the product locked and simulates real-world attack conditions rather than theoretical material resistance.

Every product listed on the LPCB Red Book Live database has been independently tested, certified and is subject to ongoing audit surveillance to confirm continued compliance. That rigour is why LPS 1175 is the standard of choice for architects, security consultants, insurers and government bodies specifying protection for high-value and high-risk environments.

LPS 1175 Security Ratings: SR1 to SR8 Explained

Each LPS 1175 rating combines two elements: the tool category used in the attack and the minimum delay the product must achieve. Together these define how sophisticated the assumed attacker is and how much time the product buys before a determined intruder could breach it. Higher ratings do not simply mean stronger materials. They mean the product has been tested and proven against increasingly powerful, specialist tools.

Premier Security's Certified LPS 1175 Range

Premier Security holds LPCB certification for the products below, listed on LPCB Red Book Live under the certificate 1097 series. Each product is shown with the rating and issue on its certificate.

The Ultimate High Security Curtain Walling family covers C5 (SR3) to E10 (SR5) in a single system, achieving its rating from either the external or the internal face. UHSCW 3 and UHSCW 4 are certified for structural openings up to 20 metres high with unlimited width. It is a separate, higher-specification system from the Jansen Façade curtain walling range, even where the two share a rating level.

One of Premier Security's most significant achievements is the simultaneous certification of products across multiple threat disciplines. The bullet resistant door system holds LPS 1175 E10 (SR5) forced entry alongside EN 1522 FB7 ballistic resistance, confirmed by independent testing at D J Goode of Suffolk. The glazed curtain wall and modular walling system holds LPS 1175 E10 (SR5) alongside EXV10 blast resistance to ISO 16933 and FB7 ballistic performance, with a U-value of 0.5 — making it one of the most comprehensively certified combined-threat facade systems manufactured in the UK.

LPS 1175 Tool Categories: What Each Rating Really Means

The tool category is the most important factor in understanding what a security rating actually protects against. A higher category means the product has been attacked with progressively more powerful and specialist equipment and has resisted for the required delay. Understanding the tools defines the threat scenario.

The delay is the time for which the product resists the opening being made, not the time until the attack stops. An attacker using Category D tools against a D10 product must work for at least 10 active minutes before a person-sized breach can be made. That delay is the window in which a response can be mounted, whether by security personnel, police or automated systems.

How LPS 1175 Testing Works

LPS 1175 testing is carried out by LPCB accredited laboratories under controlled conditions. The product is installed as it would be in a real building, including the frame, fixings, locking hardware and threshold. Trained testers then attack it using the tool category for the target rating, aiming to create a breach a person could pass through.

The target breach is 400 mm x 225 mm, representing the minimum opening an adult can pass through in a crouched position. The test is carried out with the product locked and secured, and attackers may target glazing, frames, hinges, locks, thresholds or any other part of the assembly.

The pass criterion is simple: the product must resist the breach for the full delay defined by the target rating. Bent frames or cracked glass do not count as a failure unless the target opening is achieved, so a product can sustain significant surface damage and still pass.

What LPCB Certification Covers

• Initial type testing of the complete product assembly including frame, glazing, locks, hinges and fixings
• Assessment and surveillance of the manufacturer's quality management system to ISO 9001
• Assessment and surveillance of factory production control procedures
• Periodic audit testing of products taken from production
• Listing on the LPCB Red Book Live public database
• The right to apply the LPCB certification mark to certified products

Secured by Design and LPS 1175

Secured by Design (SBD) is the official UK police security initiative. It awards a licence to manufacturers whose products have passed standards nominated by the police service and represents the Police Preferred Specification. It is widely specified for residential and communal developments, particularly those built under planning conditions requiring SBD compliance.

For doors, the minimum requirement for Secured by Design is testing to PAS 24 or certification to LPS 1175. Products holding SBD status appear on the Secured by Design member products database and may carry the SBD logo.

Premier Security holds Secured by Design accreditation, and its communal steel doorset range carries Secured by Design status. Combining SBD status with LPCB certification lets specifiers satisfy the Police Preferred Specification and the more demanding LPS 1175 criteria from one product range.

Related Standards: LPS 2081 and PAS 24

LPS 1175 is often specified alongside, or instead of, two related standards. Each one measures something different, so a rating under one never implies a rating under another.

Who Specifies LPS 1175 Products?

LPS 1175 is specified across a broad range of building types and risk levels. Its rating scale covers applications from communal entrance deterrence at SR2 through to critical infrastructure protection at SR5 and above.

• Residential & Housing Associations
• Commercial & High-Value Retail
• Schools & Education
• Healthcare Facilities
• Industrial & Utilities
• Data Centres
• Transport Hubs & Airports
• Government & Public Buildings
• Embassies & Diplomatic Missions
• Military & Defence
• Critical National Infrastructure
• Police, Courts & Justice Buildings

The right rating for a project is set by a risk assessment that considers the asset value, the likely capability of an attacker and the response time available. In high-risk and CNI contexts, that assessment is typically informed by NPSA (National Protective Security Authority) guidance. For commercial and residential projects, insurance requirements and planning conditions are often the main drivers of the specified rating.

LPS 1175 vs EN 1627: What Is the Difference?

EN 1627 is the European standard for burglar-resistant building elements and the most common alternative to LPS 1175 in specifications from European manufacturers. Both test forced entry resistance on the complete product, but they differ in test method, rating scale and how certification is maintained.

For UK projects, particularly those involving government clients, critical infrastructure or threat assessments informed by NPSA guidance, LPS 1175 is the appropriate standard to specify. EN 1627 products may meet LPS 1175 performance levels in practice, but without LPCB certification there is no way to verify this. Where a specification requires LPCB certification, only products listed on Red Book Live can satisfy it.

LPS 1175, Ballistic, Blast and Fire: Combined Protection

LPS 1175 certifies resistance to forced entry only. It does not imply ballistic resistance, blast resistance or fire performance, and each discipline has to be tested separately under its own standard. That distinction matters on projects where several threats apply, such as embassies, military installations and critical national infrastructure.

Premier Security manufactures products tested across more than one discipline:

• Ultimate High Security Curtain Walling: LPCB certified to LPS 1175 from C5 (SR3) to E10 (SR5). The family has also been tested to the methodology of EN 1522/1523 at FB7 for ballistic resistance, blast tested to ISO 16933 at EXV25 to EXV10, and crash tested by HORIBA MIRA (UKAS testing laboratory 1105) to ISO 22343-1:2023, achieving V/7200[N2A]/64/90:0.0/0.0 with zero penetration. U-values go as low as 0.5. The LPS 1175 and vehicle impact ratings are accredited; the FB7 ballistic result is tested to methodology rather than UKAS accredited.
• Premier Fire Rated Fully Glazed doorset: single leaf doorset certified to LPS 1175 Issue 7 Security Rating 2 (certificate 1097a) and to LPS 1056 for fire (certificate 1097f), classified EI 60 and E90 depending on the glazing build-up.
• Bullet resistant doorsets: independently tested to EN 1522/1523 at FB4, FB6 and FB7 with NS (no splinter) results. Where forced entry resistance is also required, our team will confirm which certified combinations suit the opening.

For more detail, see our Ballistic Resistance guide, Blast Resistance guide and Fire Resistance guide.

Frequently Asked Questions: LPS 1175 Security Products

Related Premier Security Resources

• LPS 1175 Security Doors: Security Rating 2 to D10 (SR4) certified doorsets
• LPS 1175 Security Windows: C5 (SR3) and D10 (SR4) certified fixed windows
• Thermally Broken Doors: LPS 1175 Security Rating 2 and LPS 2081 Security Rating B options
• Security Gates: LPS 1175 certified gates from B3 (SR2) to E10 (SR5)
• Security Curtain Walling: LPS 1175 C5 to E10, ISO 16933 blast and ISO 22343-1 vehicle impact tested
• LPS 2081 Swing Security Doors: Security Rating B stealth intrusion doorsets
• Swinging Security Door Systems: LPS 1175 and LPS 2081 swing doors
• Ballistic Resistance: EN 1522 FB and EN 1063 BR ratings explained
• Blast Resistance: ISO 16933, EN 13123 and EN 13541 ratings explained
• Fire Resistance: LPS 1056 and EN 13501-2 fire ratings explained
• Contact Premier Security: technical consultation and project enquiries