PAS 24 is a UK security test that checks how well windows and doors resist break-ins. During testing, professionals simulate a burglary using tools that most criminals would carry. Products that pass earn certification proving they meet enhanced security standards.
Builders and homeowners often choose PAS 24 certified products to comply with:
This certification helps ensure your windows and doors provide reliable protection against forced entry.
Certified labs carry out the testing in several stages.
Testers apply both pushing and pulling forces to vulnerable areas like locks, hinges, and glazing beads. Specifically, they use:
If the force creates a gap large enough for a 150mm x 50mm test cylinder, the product fails. This represents the space an intruder needs to reach in or operate a lock.
Attackers use tools like crowbars, screwdrivers, and chisels. Each method gets up to 15 minutes of active attack time. Testers target:
The goal is simple — create a hole large enough to fit the test cylinder.
The cutting test (Z1) uses a Stanley knife, 6mm chisel, and 25mm chisel. Testers are given 3 minutes to try and bypass seals, fixings, or panels.
In the manipulation test (A), testers use non-destructive tools such as paint scrapers and credit cards to disengage locks and restrictors. A successful bypass within 15 minutes results in failure.
Impact and cylinder tests simulate common break-in tactics. They check whether products can resist blunt force and direct attacks on the locking system.
PAS 24 also tests how well a product functions under stress. This ensures security doesn’t compromise usability.
A twisting force checks whether the product remains square and usable when subjected to uneven stress.
Diagonal force simulates building movement. The door must stay aligned and fully operational.
A downward force tests whether the window sags or binds under its own weight. It must remain within tolerance and fully functional.
A direct downward force is applied to the sash or door head. The product must support this load without distortion or loss of performance.
Cyclic testing is a durability assessment that simulates years of real-world use. As part of PAS 24, the product is repeatedly opened and closed to ensure it can withstand daily wear and tear without losing functionality or security performance.
This rigorous testing confirms that:
The updated PAS 24:2022+A1:2024, released in September 2024, addresses newer burglary techniques. Key changes include:
These updates help make PAS 24 more robust and reflective of modern threats.
Although both PAS 24 and RC (Resistance Class) ratings test burglary resistance, they serve different purposes.
Therefore, if your project needs to comply with Part Q, you must specify PAS 24 — RC ratings alone are not accepted.
Only UKAS-accredited testing bodies, such as BSI, UL or BM TRADA, can certify PAS 24 compliance. It’s important to remember that certification applies only to the exact product specification tested. Any changes to materials or hardware could invalidate the result.
We supply timber windows and doors that meet PAS 24 standards, offering security, durability, and craftsmanship.
Contact us today to discuss your project.