Security is one of the most important factors when choosing new doors and windows. Many homeowners see terms like PAS 24 and Secured by Design and aren’t sure what they actually mean. This guide explains both standards in clear terms, how they apply to modern doors and windows, and whether you need them for your home.

What is PAS 24?

PAS 24 is a UK security standard that tests the overall strength and durability of a door or window. It proves the product can resist common break-in techniques used by intruders.

PAS 24 tests include:

• Manual attack testing

• Mechanical loading

• Impact testing

• Attempted levering and forcing of the frame

• Lock and hinge security testing

If a product meets PAS 24, it demonstrates it can withstand a sustained attack and is built to a recognised, independently assessed security level.

Is PAS 24 mandatory?

For new-build homes, PAS 24 compliance is required under Approved Document Q of the Building Regulations.

For replacement doors and windows in existing homes, PAS 24 is not legally required — but choosing products that meet it is strongly recommended for improved security.

What is Secured by Design (SBD)?

Secured by Design is a police-backed security initiative.
To achieve SBD status, a door or window must:

1. Meet PAS 24 security standards

2. Be manufactured by an approved, audited supplier

3. Use certified locks, hardware and glass

4. Follow strict quality-control processes

SBD is not just a test — it is a complete accreditation scheme, ensuring the product is designed and built to reduce crime.

Do I need a Secured by Design door?

You may want SBD if:

• You are working on a new-build property

• Your insurance company prefers SBD-rated products

• You want the highest level of proven security

• You live in an area where enhanced security is important

• You want a manufacturer who is regularly audited for compliance

For many homeowners, PAS 24 alone is sufficient. But SBD provides added assurance that the product meets even stricter criteria across the whole system.

PAS 24 vs Secured by Design — what’s the difference?

Secured by Design builds on PAS 24 by adding additional checks, stronger requirements and supply-chain auditing.

Which products can be PAS 24 or SBD rated?

Most modern aluminium, uPVC and composite doors and windows can achieve PAS 24, including:

• Bifold doors

• Sliding doors

• French doors

• Entrance doors

• Casement windows

• Tilt & turn windows

Many of the systems we offer have PAS 24 and SBD options as standard or optional upgrades.

Do PAS 24 and SBD affect the appearance?

No. Security testing is based on strength and construction. The exterior appearance of the door or window does not change, and hardware is available in matching colours and finishes.

Should you choose PAS 24 or Secured by Design?

Choose PAS 24 if:

• You want strong, tested security for a replacement project

• You want compliance with recognised UK standards

• You want reliable protection without additional certification costs

Choose Secured by Design if:

• You are installing a product in a new-build home

• You want the highest level of certification

• You prefer the assurance of a police-approved standard

Both options significantly increase the security of your home.

Need help choosing the right security rating?

If you’re unsure whether PAS 24 or Secured by Design is right for your project, our team can guide you through the differences and recommend the correct specification for your property, location and building requirements.