LPS 1175 for Data Centres: Specifying B3 to E10 Across Doors, Windows, Glazing & Curtain Walling

LPS 1175 is the dominant UK standard for forced entry resistance of building envelope products and is referenced on virtually every UK data centre specification, from outer perimeter through to data hall and MMR boundaries. Premier Security Ballistic & Blast Ltd manufactures LPCB-certified LPS 1175 doors, windows, glazing, louvre doors, curtain walling and revolving security doors from SR2 (B3) through to SR5 (E10), Red Book listed and Issue 8 compliant, with optional combined ratings for fire, ballistic and blast resistance.

What Is LPS 1175 and Why It Matters for Data Centres

LPS 1175 (Loss Prevention Standard 1175) is published by the BRE's Loss Prevention Certification Board (LPCB) and is the UK's leading standard for testing and certifying the forced entry resistance of physical security products. Independent laboratory testing under LPS 1175 measures how long a product resists a determined attacker using a defined set of tools, with successful products listed in the LPCB Red Book and on the Approved Products Register.

For UK data centre projects, LPS 1175 has become the de facto specification language for three reasons. First, it is explicitly referenced in NPSA guidance for Critical National Infrastructure protection. Second, its ratings can be directly mapped to threat scenarios that data centre operators understand: opportunistic intruders, organised hardware theft, insider-assisted breach and determined sabotage. Third, the standard is product-agnostic, so the same rating language works across doors, windows, glazing, louvres, curtain walling, fencing, gates, grilles and roller shutters, giving specifiers a single vocabulary for the entire building envelope.

LPCB Red Book and the Building Safety Act: Only products with current LPCB certification appear in the Red Book. Specifying Red Book listed LPS 1175 products gives architects and main contractors traceable, third-party evidence of forced entry resistance, supporting the documentation requirements set out in the Building Safety Act 2022 and the Golden Thread.

Understanding LPS 1175 Issue 8 Ratings

LPS 1175 is currently in Issue 8, which replaced the long-established SR1 to SR8 scale with a more granular letter-and-number system. The two notations describe the same underlying performance, and most current Premier products carry dual labels (for example "C5 (SR3)") to make life easier for specifiers working across both vocabularies.

How the Issue 8 system works

An Issue 8 rating combines two components:

A letter (A to H) describing the tool category the product has been tested against. Higher letters represent more capable attack tooling.
A number (1, 3, 5, 10, 15 or 20) describing the minimum delay time in minutes against that tool category.

So an LPS 1175 D10 rated door has been independently tested to resist tool category D for at least ten minutes of continuous, determined attack.

LPS 1175 tool categories at a glance

Tool Category	Typical Threat Profile	Representative Tools
A	Stealth attack, minimal noise tolerated	Bodily force, simple hand tools, glass cutters
B	Opportunistic intruder	Pliers, bolt croppers, claw hammer, screwdriver
C	Determined opportunist	Larger hand tools, lever bars, sledgehammer
D	Deliberate forced entry	Felling axe, longer pry bars, longer-handled bolt croppers
E	Heavy manual attack	Larger sledgehammer, jemmy bar, longer felling axe
F	Battery powered tools	Cordless drills, cordless reciprocating saws
G	High-power corded tools	Petrol-driven disc cutters, larger power saws
H	Specialist tools	High-capacity disc cutters, hydraulic equipment

Mapping Issue 7 SR ratings to Issue 8

Many UK data centre specifications still reference the older SR1 to SR8 vocabulary. The table below shows the closest direct equivalents, which is what Premier and LPCB use when carrying over legacy ratings.

Issue 7 Rating	Issue 8 Equivalent	Typical Data Centre Application
SR1	A3	Light commercial, rarely used on data centre projects
SR2	B3	Outer perimeter pedestrian gates, low-risk ancillary buildings
SR3	C5	Building envelope doors, plant rooms, general staff doors
SR4	D10	Data hall doors, MMR doors, secure compound boundaries
SR5	E10	High-sensitivity MMR, control rooms, classified compute
SR6	F10	Counter-terror and government-adjacent compute
SR7	G15	Specialist defence and intelligence environments
SR8	H20	Specialist defence and intelligence environments

Specifier note: The Issue 7 and Issue 8 ratings are equivalents, not exact translations. Where a specification is being updated, always confirm the underlying tested rating with the manufacturer rather than assuming a one-to-one carry-over. Premier supplies current LPCB certificates on request for every product line.

Which LPS 1175 Rating for Which Data Centre Zone

There is no single statutory minimum LPS 1175 rating for UK data centres. In practice, the working consensus across UK colocation operators, hyperscale developers and NPSA-aligned security consultants is shown below. These are guideline starting points and should be confirmed against an Operational Requirement and threat assessment for each project.

Data Centre Zone	Typical LPS 1175 Rating	Why
Outer perimeter line	B3 (SR2) minimum, often C5 (SR3)	Slows opportunistic and determined opportunist intruders long enough for CCTV and response to take effect
Vehicle gate & loading bay	C5 (SR3) to D10 (SR4)	Higher rating reflects the value of hardware in transit and the cover the loading bay offers an attacker
Building envelope & reception	C5 (SR3)	Sufficient to deter and delay general intrusion, typically combined with anti-tailgating portals
Plant rooms & mechanical	C5 (SR3)	Protects M&E plant from sabotage; often combined with fire and louvre requirements
UPS & battery rooms	C5 (SR3) to D10 (SR4)	Higher rating where rooms also require blast and fire ratings for lithium-ion containment
Generator halls	C5 (SR3)	Combined with acoustic and fire performance for noise and life-safety compliance
Data halls	D10 (SR4)	Standard for UK colocation and hyperscale data hall envelopes; defends against organised hardware theft
MMR (meet-me room)	D10 (SR4) to E10 (SR5)	Concentrates critical cross-connects; insider-assisted breach is a credible scenario
Control rooms & NOC	D10 (SR4) to E10 (SR5)	Often combined with ballistic glazing for personnel protection
Government & defence-adjacent compute	E10 (SR5) or higher	Aligns with HMG Security Policy Framework and NPSA enhanced threat profiles

Premier's LPS 1175 Range for Data Centres

Premier manufactures the full envelope of LPS 1175 rated products required by a UK data centre project, from outer perimeter through to internal compartmentation. Every product line is LPCB Red Book listed, with combined ratings available for fire (EI 60 to EI 240), ballistic resistance (FB1 to FB7) and blast resistance (up to EXV10).

LPS 1175 swing doorsets

Single and double-leaf LPS 1175 swing doors from B3 (SR2) to E10 (SR5), available with vision panels, electronic access control integration, anti-thrust locking and combined fire ratings. Suitable for envelope, plant room, data hall, MMR and control room applications.

LPS 1175 sliding doors

Manual and automated sliding LPS 1175 doors up to SR4 (D10), engineered for vehicle and equipment access at loading bays, plant rooms and data hall service entries. Available with combined fire and blast ratings on request.

LPS 1175 louvre doors

Independently tested LPS 1175 louvre doors providing certified ventilation paths into plant rooms, generator halls and UPS rooms without compromising forced entry resistance. Combined with E60 and E90 fire-rated louvre options for high fire load environments.

LPS 1175 glazed doors and screens

Fully glazed and partially glazed LPS 1175 doors and screens up to D10 (SR4), built around Jansen and equivalent thermally broken steel profiles. Often specified at receptions, MMR vestibules and internal compartmentation where visibility and forced entry resistance must coexist.

LPS 1175 windows and curtain walling

Premier's window systems and curtain walling carry LPS 1175 ratings up to E10 (SR5), with combined ballistic, blast and fire ratings available on selected assemblies. The same systems support our HVM crash-tested glass curtain wall, the first glass curtain wall to pass HVM crash testing.

Revolving security doors and portals

LPS 1175 rated revolving security doors and anti-tailgating security portals for receptions and data hall boundaries on Uptime Tier III and Tier IV environments where one-person-at-a-time access control is required alongside forced entry resistance.

Retractable security grilles and hatches

LPS 1175 rated grilles for internal zoning of data halls, secure cage compartments and storage areas, plus security hatches for transaction and equipment pass-through points.

Download the LPS 1175 Rating Selection Guide

A one-page PDF reference mapping LPS 1175 Issue 8 ratings to data centre zones, with Premier product references for each application. Built for architects, M&E consultants and security designers working at RIBA Stages 2 to 4.

Get the Rating Guide

LPS 1175 vs EN 1627 for UK Data Centres

UK data centre specifications occasionally reference EN 1627 (RC2 to RC6) instead of, or alongside, LPS 1175. The two standards measure similar things but are not directly equivalent, and Premier products are frequently dual-tested to support multinational operators specifying across UK and EU portfolios.

Aspect	LPS 1175 Issue 8	EN 1627 (RC2 to RC6)
Origin	UK (LPCB, BRE)	European Committee for Standardization
Tool categories	A to H, eight defined categories	Three test tool sets covering RC1 to RC6
Test methodology	Dynamic attack by skilled test team, defined timed attack	Static load, manual attack and tool attack phases
UK CNI recognition	Explicitly recognised by NPSA, dominant in UK CNI specs	Recognised but less commonly specified on UK CNI projects
Product coverage	Doors, windows, glazing, fencing, gates, louvres, grilles, curtain walling, hatches, shutters	Doors, windows, shutters, grilles, curtain walling
Typical UK data centre use	Primary specification	Secondary or international portfolio specification

Specifiers working on a UK-only data centre project will almost always default to LPS 1175. Premier supplies dual-tested products where international operators require EN 1627 alignment for portfolio consistency.

LPCB Certification, the Red Book and Premier's Accreditations

An LPS 1175 rating is only meaningful if it is backed by current third-party certification. Premier's LPS 1175 products are independently tested by BRE, LPCB certified and listed in the LPCB Red Book and on the Approved Products Register, with current certificates available on request for every product line.

LPCB Red Book listed across the SR2 (B3) to SR5 (E10) range
Secured by Design member, supporting Police Preferred Specification on UK planning applications
ISO 9001 certified manufacturing
Constructionline Gold approved supplier
Independently tested for combined ratings including EN 1522 FB1 to FB7 (ballistic), EN 13123-2 (blast) and EN 1634-1 (fire)
Issue 8 compliant product range with dual Issue 7 / Issue 8 labelling on request

Frequently Asked Questions

What is the minimum LPS 1175 rating for a UK data centre?

There is no single statutory minimum, but UK practice typically starts at B3 (SR2) for outer perimeter elements, C5 (SR3) for the building envelope and most plant rooms, and D10 (SR4) at data hall and MMR boundaries. E10 (SR5) and above is specified at the highest-sensitivity internal compartments and on government or defence-adjacent compute environments.

What is the difference between LPS 1175 Issue 7 and Issue 8?

Issue 7 used the SR1 to SR8 scale, where each SR rating bundled tool category and time together. Issue 8 separates them into a letter (tool category A to H) and a number (time in minutes, 1, 3, 5, 10, 15 or 20). The system is more granular and easier to map to a specific threat profile, but the equivalent ratings carry over directly (SR2 to B3, SR3 to C5, SR4 to D10, SR5 to E10 and so on).

Is LPS 1175 mandatory for UK Critical National Infrastructure?

LPS 1175 is not a statutory requirement, but it is explicitly recognised by NPSA and is referenced in the majority of UK Critical National Infrastructure specifications. Following the September 2024 CNI designation for UK data centres, LPS 1175 has effectively become the default UK forced entry resistance specification for new builds and major refurbishments.

Can LPS 1175 doors be combined with fire and ballistic ratings?

Yes. Premier manufactures dual-certified and quad-certified doorsets that hold simultaneous LPS 1175 forced entry ratings, EN 1634-1 fire integrity and insulation ratings (EI 60 to EI 240), EN 1522 ballistic ratings (FB1 to FB7) and EN 13123-2 blast ratings (up to EXV10). Combining ratings into a single tested product simplifies specification and gives one point of accountability for envelope performance.

Are Premier's LPS 1175 products LPCB Red Book listed?

Yes. Every Premier LPS 1175 rated product line is independently tested by BRE, certified by the LPCB and listed in the Red Book and on the Approved Products Register. Current certificates are issued on request and are kept up to date as ratings are extended or renewed.

Can Premier supply LPS 1175 doors to both Issue 7 and Issue 8 labelling?

Yes. Our LPS 1175 product range carries Issue 8 ratings as standard, with dual Issue 7 SR labelling available where a project specification still references the older vocabulary. This avoids any ambiguity on tender and handover documentation during the industry's transition to Issue 8.

Discuss LPS 1175 specification for your data centre project

Premier's data centre specification team can review your Operational Requirement, threat assessment and NBS specification and recommend the right LPS 1175 ratings (and combined fire, ballistic or blast ratings where required) for each zone of your project. We work with architects, M&E consultants, security consultants and main contractors from RIBA Stage 2 onwards.

Request a Specification Review

LPS 1175 for Data Centres