When it comes to aluminium patio doors and bifold doors, security is just as important as style and thermal performance. Homeowners increasingly expect reassurance that their new doors will not only look good and perform well but also provide maximum protection against intruders. For installers, specifying the right system, locking systems and explaining available upgrades is essential for meeting both building regulations and customer expectations. Below, we explore the security features of two of the most popular aluminium systems on the market—Sheerline Prestige and Cortizo—covering both patio and bifold doors.
Patio Doors – Sheerline Prestige Lift & Slide and Cortizo 4700
Standard Security Features
Both the Sheerline Prestige Lift & Slide and Cortizo 4700 sliding patio doors we supply come as standard with:
- A 2 security handle*
- A 1 cylinder lock*
This provides robust protection as standard, ensuring the doors meet our stringent security standards.
PAS24 Upgrade Options
For projects requiring compliance with PAS24:2016 (often mandatory on new-build sites), both systems can be specified with a PAS upgrade. This gives installers the reassurance that the doors achieve enhanced security testing, including resistance to forced entry.
Optional 3* Cylinder Upgrade
For homeowners looking for maximum protection, both systems can be upgraded to an Ultion 3 cylinder*. This upgrade gives peace of mind.
Additional Considerations
- Centre Locking – Patio doors that lock in the centre can be a potential weak point. Reinforced multi-point locking systems and interlocking profiles reduce vulnerability.
- Glazing Strength – Double and triple-glazed units provide significant resistance to attack. Smashing through requires breaking multiple panes, with gas-filled cavities acting as an additional barrier.
- Privacy & Security – Optional integral blinds provide privacy, preventing would-be intruders from seeing inside. They also reduce solar gain in summer and retain heat in winter—an extra selling point for homeowners.
Bifold Doors – Sheerline Prestige and Cortizo Aluminium Bifolds
Standard Security Features
Both the Sheerline Prestige Bifolds and Cortizo Bifold Door systems we supply come as standard with :
A 2 handle*
A 1 cylinder lock*
This gives installers confidence in offering strong baseline protection straight out of the box.
PAS24 Upgrade Options
Like patio doors, both bifold systems can be specified with PAS24-compliant upgrades, essential for meeting new-build security requirements and providing enhanced reassurance to homeowners.
Optional 3* Cylinder Upgrade
For enhanced security, upgrading to an Ultion 3 cylinder* provides maximum lock security, ideal for security-conscious customers.
Sheerline Prestige Bifold Doors – Interlock Reinforcement
One of the standout features of our Sheerline Prestige Bifold Doors is the robust with full length interlocks and double deadbolts . These reinforced interlocks provide additional strength where panels meet, ensuring the system resists forced entry and meets higher security expectations. This is a key selling point for installers seeking to demonstrate the technical superiority of Sheerline systems.
Multi-Point Locking & Track Security
Both Sheerline and Cortizo bifolds incorporate multi-point locking systems, which secure the door leaf at multiple points along the frame. This is far stronger than a single-point lock and makes it significantly harder to force entry.
Why Security Upgrades Matter for Installers
Explaining these features and options to homeowners helps build confidence in aluminium doors while allowing installers to:
Meet building regulation requirements with PAS24-tested products
Offer upgrade options (e.g., Ultion 3* cylinders)
Differentiate between systems by highlighting features such as the Sheerline Prestige Bifold interlocks
Reassure customers that their investment is not only stylish and efficient but also secure
Final Thoughts
Aluminium patio and bifold doors deliver a sleek, contemporary aesthetic—but security should always remain a top priority. With systems like Sheerline Prestige and Cortizo, installers have access to strong baseline protection, PAS24-compliant options, and premium upgrades such as 3 cylinder locks* and integral blinds.
By specifying these doors installers can deliver projects that balance style, performance, and complete peace of mind.
To learn more about our Sheerline and Cortizo patio doors and bifold doors, or to request a quote, call 01623 702611 or complete our online contact form today.
