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High-Security Sash Windows for Heritage & High-Risk Buildings
Most people do not begin by searching for LPS 1175 sash windows. They begin with a problem.
You may be responsible for a listed building that requires a security upgrade following a risk assessment. You may be working on a project where insurers, consultants, or security advisors require certified protection. Standard sash windows will not withstand a determined attack.
At the same time, the building’s appearance cannot be compromised. Planning officers expect accurate proportions, authentic glazing bars, and consistent sightlines. Clients expect value, heritage integrity, and a solution that does not look defensive.
LPS 1175 sash windows solve this challenge.
At Premier Security Ballistic & Blast Ltd, we design high-security sash windows that meet recognised standards while maintaining traditional aesthetics. The result is discreet protection that performs under pressure without altering the character of the building.
What Are LPS 1175 Sash Windows?
LPS 1175 is a recognised physical security standard, independently tested under controlled attack conditions.
Products are subjected to sustained force, tool attacks, and repeated attempts to gain entry. If a product fails, it fails formally and publicly. This is what separates proven security from unverified claims.
Rather than claiming strength, LPS 1175 sash windows are tested and certified to resist real-world attack methods.
The focus is not on making a window impenetrable. It is about delay. The longer a window resists, the greater the risk for an intruder. Time introduces noise, detection, and deterrence.
Understanding LPS 1175 Security Ratings (SR Levels)
LPS 1175 uses a structured system of Security Ratings (SR). Each level increases the intensity, duration, and sophistication of the attack.
- SR1: Protection against opportunistic attempts
- SR2 (B3 equivalent): Resistance to determined intruders using tools and sustained force
- SR3 and above: Higher threat environments requiring advanced resistance
We most commonly specify LPS 1175 SR2 sash windows, as they provide a strong balance between security performance and heritage suitability.
SR2 goes significantly beyond standard residential security. It assumes a committed attacker who expects resistance and continues applying pressure.
Why Traditional Sash Windows Fall Short on Security
Sash windows are essential to period architecture, but they are rarely designed with security in mind.
Traditional designs rely on:
- Timber sections and joinery
- Cord and weight systems
- Basic locking mechanisms
Under force, these elements can fail quickly. Leveraging the meeting rail or applying pressure to the frame often results in rapid entry.
Retrofitting security typically creates further issues:
- Visible locks that disrupt aesthetics
- Altered proportions and profiles
- Planning objections in conservation areas
This creates a conflict between security requirements and heritage preservation.
How Our LPS 1175 Sash Windows Are Designed
We design sash windows as complete security systems, not as upgraded standard products.
From the outside, they retain the appearance of traditional sash windows. Proportions remain accurate, detailing remains consistent, and nothing signals enhanced security.
Internally, the structure is engineered for resistance:
Ballistic and Blast-Resistant Sash Windows
For higher-risk environments, additional protection can be incorporated without altering the external appearance.
Ballistic Resistance
We can specify glazing that resists handgun fire and high-impact force. The glass remains intact, preventing penetration and protecting occupants.
Blast Resistance
Frames and fixings can be engineered to manage blast loads. This includes controlled energy absorption and fragment retention, reducing secondary damage.
Crucially, these enhancements remain visually discreet, which is essential for sensitive or historic façades.
LPS 1175 vs Standard Window Security
Standard residential security ratings are designed for low-risk environments.
LPS 1175 addresses a different level of threat.
It assumes:
- Determined attackers
- Use of tools and force
- Sustained attempts to gain entry
If your project involves meaningful risk, standard solutions often fall short. LPS 1175 provides proven, tested resistance where it matters most.
Why Choose Premier for LPS 1175 Sash Windows?
We operate at the intersection of security performance and architectural sensitivity.
Our team understands:
- How real-world attacks occur
- How conservation officers assess changes
- How to design solutions that satisfy both
Clients choose us because we:
- Provide clear, expert guidance
- Support planning and approvals
- Deliver certified, high-performance systems
- Maintain the integrity of the building
Security should never compromise the architecture it protects.
Get Expert Advice on LPS 1175 Sash Windows
LPS 1175 sash windows solve a problem many projects face but struggle to define. You need Proven protection, Certified performance & solutions that respects the building
We design systems that work quietly in the background, protecting people without drawing attention.
Speak to our team today to discuss your project and security requirements.
Our experts will:
- Assess your project requirements and security needs
- Recommend compliant and proportionate solutions
- Provide technical guidance and specification support
- Advise on design, installation and next steps
