Trellidor trellidor plus t900 certified to bre lps 1175 rated lpcb level 1 steel security grilles retractable

Trellidor Plus T900 Retractable Security Grille

The Trellidor Plus T900 is a premium, fully framed galvanised steel retractable security grille engineered to deliver certified physical protection for both residential and commercial properties. Independently tested and certified to LPCB Level 1 (LPS 1175: Issue 6, Cert/LPCB ref. 474b) by the London-based Loss Prevention Certification Board, the T900 represents the entry point into the official Trellidor certified security range. It is the ideal choice for homeowners, retailers, and commercial premises where a robust, independently verified physical barrier is required without the need for the higher SR2 or SR3 rated Trojan series.

Custom-made to measure for your exact structural opening, the T900 is suitable for doors, patios, passages, windows, stairways, and retail outlet counters. Neat, compact, and smooth-operating, it provides exceptional security while remaining unobtrusive and visually appealing when open.

LPCB Level 1 Certification & UK Market Relevance

In the UK security market, specifying a product with an independent LPS 1175 certification is increasingly important for both insurers and commercial property managers. The T900's LPCB Level 1 rating confirms it has been independently attack-tested by BRE Global Ltd, the UK's most respected third-party testing body. This certification gives property owners and business managers the confidence that the barrier has been rigorously assessed against a defined level of physical threat, and not simply marketed as secure without independent verification.

Advanced Construction & Engineering

The T900 is engineered with a series of purpose-built strengthening features that elevate it above standard, uncertified security grilles. Every component has been designed to resist a determined attack while ensuring day-to-day ease of use.

Structural Components

• Steel Top Track with Cover: Prevents access to the wheel assembly and corner cleat rivets, protecting the most vulnerable part of the top-hung mechanism from tampering.
• Roll-Formed Steel Uprights: Heavy-duty roll-formed steel construction provides superior strength and rigidity across the full height of the grille.
• Semi-Tubular Stainless Steel Rivets: Purpose-designed specifically for resistance during attack, significantly reducing the risk of flights and uprights being cut or prised apart.
• Lattice Link Assembly: Located at the base of the uprights, this lattice design strengthens the bottom of the grille under attack.
• Links Cross Three Uprights: Each link connects three upright bars simultaneously, increasing the overall structural strength and ensuring the door moves as a single, continuous unit.
• Reinforced Anchor Plates: Heavy-duty anchor plates are fitted at every wall fixing point, significantly increasing resistance against the frame being forced from the structural substrate.
• Steel Sill Guide with Semi-Tubular Rivets: The upright sill guide uses semi-tubular rivets for enhanced strength and resistance against attack at the bottom of the grille.

Locking System

• Multi-Point Deadlock: The T900 is fitted with a patented Trellidor deadlock that engages at multiple locking points across all door height ranges with just a single turn of one key.
• Lock Cover Plate: A purpose-designed steel lock cover protects the lock box from external access during an attack, preventing drilling, picking, and physical tampering.

Superior Finish & Durability

All T900 grilles are manufactured in Trellidor's LPCB ISO-audited factory and pre-treated before undergoing powder coating in a state-of-the-art plant. The pre-treatment process provides enhanced corrosion and UV resistance, making the T900 highly suitable for both coastal and inland UK environments.

Available Colour Options

The T900 is available in seven premium powder-coated finishes to complement any architectural style:

• Matt White
• Matt Bronze
• Matt Sand
• Matt Light Brown
• Matt Aluminium
• Matt Charcoal
• Matt Black

Note: Powder-coated colour samples are available on request. Please contact our Samson Doors team for a physical colour swatch before placing your order.

Where Does the T900 Sit in the Trellidor Range?

The Trellidor retractable grille range is structured by level of independent certification and strengthening features. The T900 is the entry-level LPCB certified model in the range, making it an excellent choice where independent security verification is required without the need for heavy-duty commercial-grade protection.

• Trellidor Plus T900: Certified to LPCB Level 1 (SR1) — ideal for residential and lower-risk commercial applications.
• Trellidor Trojan II T1000: Certified to LPCB Level 2 (SR2) — suited for high-risk commercial and public sector environments.
• Trellidor Trojan III T3000: Certified to LPCB Level 3 (SR3) — the world's highest-rated retractable sliding grille for critical infrastructure and extreme threat environments.

Applications & Recommended Environments

The Trellidor Plus T900 is classified as a medium-risk security barrier, holding an official LPCB Level 1 certification. This makes it an exceptionally versatile retractable grille, perfectly bridging the gap between standard domestic security and heavy-duty commercial protection. Custom-made to fit your exact structural opening, the T900 is designed to secure a wide variety of environments without dominating the aesthetic of the building.

Residential & Domestic Protection

For homeowners requiring insurance-approved, independently tested security, the T900 provides ultimate peace of mind. Because of its neat, compact design, the grille stacks tightly out of the way when not in use, making it ideal for domestic applications.

• Patio & French Doors: Provides a formidable, fully framed barrier for vulnerable glass sliding doors while allowing fresh air, ventilation, and natural light into the home.
• Windows & Passages: Ideal for securing ground-floor windows against opportunistic break-ins or partitioning vulnerable hallways.
• Stairways & Safe Zones: Frequently used internally to create a secure "safe zone" on the upper levels of a residential property, safely separating bedrooms from the ground floor during the night.

Commercial & Retail Sectors

The T900 offers excellent value for business owners who need certified physical protection but do not require the extreme structural weight and cost of an SR2 or SR3 rated grille.

• Retail Outlet Counters: Custom-measured to secure serving hatches, kiosks, and retail counters after hours, protecting stock and till areas.
• Office Entrances & Corridors: Highly effective for internal zoning within commercial buildings, reliably restricting access to sensitive offices, IT rooms, or high-value stock passages.
• Shop Fronts & Kiosks: Protects retail windows and entrances from smash-and-grab attacks while maintaining visibility for your business out of hours.

Environmental Adaptability

Every Trellidor Plus T900 grille undergoes a rigorous pre-treatment process for enhanced UV and corrosion resistance prior to being powder coated in a state-of-the-art facility.

• Coastal & Inland Conditions: Unlike standard steel grilles that can rapidly degrade, the T900 is engineered and warranted for installation in both standard inland environments and harsh coastal locations subject to salt-air corrosion.

Technical Specifications: Trellidor Plus T900

The Trellidor Plus T900 is engineered with highly specific strengthening features designed to resist physical attack. Manufactured in an LPCB ISO-audited facility, it combines robust galvanised steel construction with precise mechanical components to deliver smooth operation and certified Level 1 security.

Certifications & Security Ratings

• Security Rating: LPCB Level 1 Certified.
• Testing Standard: LPS 1175: Issue 6 (Cert/LPCB ref. 474b).
• Testing Body: Independently attack-tested and certified by the London-based Loss Prevention Certification Board (BRE Global Ltd).

Materials & Structural Engineering

• Framework: Fully framed sliding barrier constructed from high-strength, roll-formed galvanised steel uprights.
• Trellis Design: Robust double-trellis design where the steel links cross over and connect three upright bars simultaneously, ensuring the grille operates as a unified, highly resistant structure.
• Link Closures: Flights are joined together using heavy-duty steel spacer tubes and recess bushes, drastically increasing the strength of the flights under attack.
• Base Reinforcement: Features a specialised lattice link assembly positioned at the bottom of the uprights to strengthen the base of the grille against leveraging.

Tracking & Hardware

• Top Track: Heavy-duty steel top track equipped with a protective steel cover. This prevents access to the wheel assembly and corner cleat rivets, protecting the top-hung unit from being compromised.
• Wheel Assembly: Operates via an upright nylon wheel holder assembly featuring an aluminium shaft, designed to carry the weight of the top-hung unit effortlessly for smooth, daily operation.
• Sill Guide: Upright steel bottom sill guide fastened with semi-tubular rivets for enhanced structural integrity at floor level.
• Rivets: Assembled using purpose-designed, semi-tubular stainless steel rivets, which significantly reduce the risk of the flights or uprights being cut or sheared.
• Wall Fixings: Reinforced anchor plates are utilised at every wall fixing point to dramatically increase the frame's resistance to being forced or pulled out of the brickwork.

Locking Mechanism

• Primary System: Patented Trellidor multi-point deadlock system.
• Operation: Engages multiple locking points across the entire height of the door through a single key turn.
• Attack Protection: The locking mechanism is shielded by a purpose-designed steel lock cover to prevent access to the lock box during an attack.

Finishes & Colour Options

All T900 grilles undergo a specialised pre-treatment process to enhance corrosion and UV resistance before being finished in a state-of-the-art powder coating plant. This makes them highly durable for both inland and coastal installations.

• Standard Powder-Coated Colours: Matt White, Matt Bronze, Matt Sand, Matt Light Brown, Matt Aluminium, Matt Charcoal, and Matt Black.

The Trellidor Plus T900 is a custom-made, fully framed retractable security grille designed to be professionally installed for smooth operation and maximum security performance. Because it is an LPCB Level 1 certified barrier, correct fitting into the structural opening is essential to ensure the grille performs as intended.

Before Installation (Site Checks)

• Confirm the structural opening: The fixing perimeter must be solid and suitable for secure anchoring (for example brickwork, blockwork, concrete, or structural steel). Avoid fixing into purely decorative finishes.
• Check the aperture is true: Measure width and height in multiple positions and work to the smallest measurement to ensure the fully framed grille fits correctly.
• Plan stacking direction: Decide which side the grille will retract to, ensuring there is adequate space for the folded stack when open.

Typical Installation Process (What Happens On Site)

1. Position the fully framed grille: The frame is offered into the reveal and aligned so the unit sits square and operates freely.
2. Secure the frame to the opening: Fixings are installed through the reinforced anchor plates at the wall fixing points to maximise resistance and stability.
3. Fit and protect the top track: The steel top track is installed along with its protective cover, helping prevent access to the wheel assembly and key fixing points.
4. Align the bottom guidance: The upright steel sill guide is set and checked so the grille runs straight, closes cleanly, and resists levering at floor level.
5. Set up the locking system: The patented Trellidor multi-point locking is tested to ensure multiple locking points engage correctly with a single key turn.

Commissioning & Handover

• Operational test: The installer will open/close the grille repeatedly to confirm smooth travel, correct stacking, and clean engagement at the locking points.
• Key and lock check: Keys are tested, and the lock cover is checked for correct fit and protection.
• Maintenance guidance: You’ll be advised on basic cleaning and care to keep the grille operating smoothly and looking its best.

Important Notes

• Professional fitting recommended: The T900 is supplied as a made-to-measure security barrier and is intended to be installed by trained technicians.
• Do not modify on site: Cutting, drilling, or altering components can affect operation and compromise security performance.

Every Trellidor Plus T900 retractable security grille is manufactured to stringent quality standards in an LPCB ISO-audited production facility. Trellidor's commitment to quality extends well beyond the point of installation, with a comprehensive manufacturer's warranty covering materials, locks, and electrical components. To ensure your warranty remains fully valid, it is essential that the grille is professionally installed and maintained according to the recommended Trellidor maintenance regime.

Standard Warranty Terms

Warranty periods vary depending on the proximity of the installation to coastal environments, where salt air and increased humidity place greater demands on the materials and components.

Maintaining Your Warranty

To keep both corrosion and criminals at bay, and to ensure the full warranty period remains valid, Trellidor recommends a straightforward maintenance regime. Failure to carry out regular maintenance may affect the validity of the product warranty.

• Regular Cleaning: Clean the steel framework, tracks, and flights with a mild non-abrasive soap solution and a soft cloth. Remove any dirt or debris from the tracks to ensure smooth, unobstructed operation at all times.
• Lubrication: Keep the locking cylinder clear of dust using a graphite-based dry lubricant. Never use oil-based or wet lubricants inside the keyway as this can attract debris and cause the mechanism to seize.
• Track Inspection: Periodically inspect the top track cover, sill guide, and anchor plates for any signs of physical damage, corrosion, or loosening fixings. Address any issues promptly.
• Coastal Environments: In coastal locations, increase the frequency of cleaning to counteract the effects of salt air on the powder-coated framework and locking components.

Warranty Conditions

• Professional Installation: The warranty is only valid when the grille has been professionally measured and fitted by a trained, certified technician strictly in accordance with the manufacturer's installation specifications.
• Unauthorised Modifications: Any cutting, drilling, welding, or alteration of the grille's components after installation will immediately void the manufacturer's warranty.
• Intended Use: The warranty covers material and manufacturing defects under normal intended use only. It does not extend to damage caused by deliberate forced attacks, structural building movement, fire, flooding, or acts of nature.
• Original Purchaser: The warranty applies to the original purchaser only and is not transferable upon sale or change of ownership of the property.

For full warranty registration and to discuss your recommended maintenance regime, please contact the Samson Doors customer service team following the completion of your installation.

How to Measure for the Trellidor Plus T900

Because the Trellidor Plus T900 is a custom-made, fully framed security barrier, precise measurements are critical for a successful installation. The grille is designed to sit within a structural opening (reveal fix) or on the face of the wall (face fix). The following guide will help you capture the correct dimensions to ensure your LPCB Level 1 certified grille fits perfectly.

Step 1: Inspect the Opening

Before measuring, verify that the opening is suitable for installation. The T900 requires a solid substrate for anchoring (brick, concrete, or structural steel). Ensure there are no obstructions such as skirting boards, dado rails, or protruding door handles that could foul the operation of the grille.

Step 2: Measuring the Width

Structural openings are rarely perfectly square. You must measure the width in three separate locations to identify any potential variances.

1. Measure the width at the very top of the opening.
2. Measure the width across the middle.
3. Measure the width at the very bottom (floor level).

Critical Rule: Always record the smallest of the three measurements. This is your tightest structural width.

Step 3: Measuring the Height

Similarly, measure the height in three positions to account for uneven floors or lintels.

1. Measure the height at the far left side.
2. Measure the height in the centre.
3. Measure the height at the far right side.

Critical Rule: Record the shortest of the three measurements. This is your tightest structural height.

Step 4: Applying Installation Tolerances (Reveal Fix)

When installing a fully framed grille between the structural opening (a reveal fix), you cannot order the grille to the exact tightest dimensions. You must allow a manufacturing and installation tolerance so the steel frame can physically slide into the opening without binding against the brickwork.

• Width Deduction: Take your smallest width measurement and deduct at least 10mm (5mm per side) to get your final ordering width.
• Height Deduction: Take your shortest height measurement and deduct at least 10mm (5mm top and bottom) to get your final ordering height.
• Note: Any resulting gaps around the frame can be easily sealed with frame sealant or architrave trim once the grille is bolted securely in place.

Step 5: Considerations for Face-Fixed Installations

If you are mounting the grille onto the face of the wall (outside of the reveal) to keep the opening completely clear when the grille is stacked, tolerances work differently:

• Width: Measure the clear opening width and add sufficient overlap (typically 15-20% of the opening width) so the stacked grille sits flush against the wall surface, keeping the doorway completely clear.
• Height: Measure the clear opening height and add at least 50-100mm above the lintel to provide a solid, flat fixing surface for the heavy-duty top track.

Step 6: Allowance for Tracks

The T900 features a steel top track and a bottom sill guide. When measuring the height, ensure you are measuring from the underside of the lintel all the way down to the solid floor. If there is a carpet or floating floor, you may need to lift it or cut it back to ensure the bottom track sits directly on a solid, level structural substrate.

Need help? If you are unsure about your specific structural opening, applying tolerances, or require advice on stacking options, please contact the Samson Doors technical team with your photos and rough dimensions before placing your order.