Certified Fire Rated Glass Solutions for Westminster’s Historic and Modern Buildings

In the City of Westminster, where heritage conservation meets modern building performance, specifying fire rated glass requires a precise understanding of both local planning policies and national fire safety regulations. For projects ranging from Grade I listed townhouses near Belgravia to contemporary commercial developments in Paddington, Antifires provides certified glazing solutions that comply with Approved Document B (Fire Safety) and BS 476 Part 22: 1987 standards. Westminster City Council mandates that all new builds and material alterations meet stringent fire resistance criteria, often requiring glazed assemblies to achieve 30 to 120 minutes of integrity (E) and, where necessary, insulation (I). For listed structures, the challenge lies in integrating modern passive fire protection without compromising historic fabric. Antifires addresses this through bespoke framing systems using G.M.S. hollow steel sections and ceramic wool seals, ensuring that fire rated glass can be installed within slim-profile frames that respect original sightlines. Specifiers are encouraged to reference the official Approved Document B guidance when preparing building control submissions. By aligning certified test data with local fire officer requirements, Antifires supports Westminster architects and contractors in achieving compliance while preserving the architectural character of conservation areas such as Marylebone, Soho, and St James’s.

Aligning Fire Rated Glass with Westminster’s Listed Building Consent and Approved Document B Requirements

Westminster’s planning authority requires that any glazing specification for listed buildings or developments within conservation areas must satisfy both Listed Building Consent and the functional demands of Approved Document B. For Grade I and II structures, fire rated glass must deliver proven integrity performance without altering original window proportions or masonry detailing. Antifires supplies assemblies tested to BS 476 Part 22, offering integrity ratings from 30 to 120 minutes using multi-layer composite glass structures. For example, a 10mm FPOS configuration (3mm float glass + 4mm fire gel + 3mm float glass) achieves 135 minutes of integrity, making it suitable for internal compartment walls where heritage aesthetics are paramount. The framing solution typically employs G.M.S. hollow steel sections with 3mm to 6mm ceramic wool packing, allowing installation within existing reveals without invasive fixings. This approach ensures that fire separation requirements are met while maintaining the visual continuity of historic interiors. For projects near Westminster Abbey or the Houses of Parliament, where planning officers scrutinise every alteration, Antifires provides pre-reviewed technical drawings that demonstrate compliance with local fire safety statements, reducing approval timelines significantly.

Selecting Fire Rated Glass Integrity and Insulation Classes for Westminster Commercial and Residential Projects

Selecting the correct fire resistance class for Westminster projects depends on the building’s occupancy, escape route design, and compartmentation strategy. For commercial offices in Marylebone, EI30 or EI60 rated glass is typically specified for internal partitions and vision panels, ensuring both integrity and thermal insulation to prevent fire spread. Antifires offers certified assemblies such as the 28mm EI60 panel (6mm + 5.5mm gel + 5mm + 5.5mm gel + 6mm), which delivers 66 minutes integrity and 64 minutes insulation under BS EN 1634-1 conditions. For residential apartment lobbies in Soho, where smoke control and heat radiation are critical, EW120 rated glazing provides radiation control alongside integrity. The table below summarises typical ratings applicable to Westminster building types:

Project TypeRecommended RatingGlass Structure ExampleTest Standard
Commercial office partitionsEI30 / EI6021mm FPOS (120 min integrity, 30 min insulation)BS 476 Part 22
Residential apartment lobbiesEW12015mm FPOS (132 min integrity, 34 min insulation)BS EN 1634-1
Heritage internal screensE60 / E906mm E90 glass (90 min integrity)BS 476 Part 22

Each specification is supported by certified documentation that directly supports Building Control applications, ensuring that fire rated glass assemblies meet both functional fire separation demands and the visual constraints of Westminster’s conservation areas.

Addressing Fire Glazing Demands in Westminster’s Civic, Retail and Luxury Apartment Projects

Westminster’s civic buildings—including council offices near St James’s Park, community centres, and public libraries—demand fire rated glazing that withstands high footfall while complying with Part M (Access to and Use of Buildings) and fire safety regulations. Antifires supplies robust, non-combustible framing solutions for entrance screens, internal vision panels, and corridor glazing rated to 60 minutes integrity. For example, a 26mm door glass assembly (5mm + 5.5mm gel + 5mm + 5.5mm gel + 5mm) achieves 89 minutes integrity and 68 minutes insulation, making it suitable for high-traffic escape routes. In luxury apartment projects in Mayfair and Knightsbridge, specifiers often require floor-to-ceiling fire rated glass that maintains open-plan aesthetics without compromising compartmentation. Antifires provides 50mm and 54mm ultra-high-performance glass structures certified to EI120, delivering 120 minutes of both integrity and insulation. These assemblies incorporate intumescent seals (20mm × 4mm) and ceramic fibre expansion gaps (3mm to 5mm) to accommodate thermal movement during fire exposure. For projects near Westminster’s retail corridors, such as Oxford Street, the glass can be integrated with automatic door systems while maintaining fire resistance, ensuring both safety and accessibility for all building users.

Why Westminster Specifiers Partner with Antifires for Certified Fire Rated Glass and Local Compliance Support

Westminster specifiers choose Antifires for certified fire rated glass solutions that streamline local compliance processes. The company holds UKAS-accredited test reports to BS 476 Part 22 and CE marking under EN 12150, providing directly verifiable evidence for building control submissions. Antifires’ technical team pre-reviews project drawings to verify that fire resistance levels align with Westminster fire officer requirements, reducing approval delays. For example, when specifying 60-minute fire rated glass for doors and partitions, the team ensures that framing, sealant, and anchoring details match the exact conditions of the certified test. This includes verifying that G.M.S. hollow steel frames are fixed with M6/M8 anchor bolts at 300–600mm spacing and that ceramic wool packing density meets 210 kg/m³. For heritage projects requiring 90-minute fire rated glass for windows and screens, Antifires provides slim-profile framing that respects original sightlines while maintaining fire integrity. By offering comprehensive compliance support—from initial specification review to final certification—Antifires reduces the risk of non-compliance and ensures that Westminster’s historic and modern buildings achieve the highest standards of passive fire protection.

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Frequently Asked Questions (FAQ)

For internal glazed partitions in commercial offices within Westminster, Building Control typically requires a minimum of 30 minutes integrity (E30) for simple room separation, but 60 minutes integrity and insulation (EI60) is often specified for partitions that form part of a protected escape route or compartment wall. This aligns with Approved Document B recommendations for office buildings with more than one storey. Antifires supplies certified assemblies such as the 21mm FPOS glass (120 minutes integrity, 30 minutes insulation) or the 28mm EI60 panel (66 minutes integrity, 64 minutes insulation) to meet these requirements. Specifiers should consult the local fire officer during the design stage to confirm the exact rating needed based on the building’s height, occupancy, and travel distance.

Yes, Antifires can provide fire rated glass that closely matches the appearance of original sash windows for Grade II listed buildings in Westminster. The company offers slim-profile G.M.S. hollow steel framing systems that can be painted to match existing joinery, while the glass itself—such as the 10mm FPOS (3mm float glass + 4mm fire gel + 3mm float glass)—maintains a clear, traditional appearance. For heritage applications, Antifires works with conservation officers to ensure that the framing depth and sightlines do not alter the building’s character. Certified to BS 476 Part 22, these assemblies achieve up to 135 minutes integrity, allowing them to be used in internal partitions or secondary glazing within original sash frames, subject to Listed Building Consent.

Antifires ensures compliance with both BS 476 Part 22 and the latest Approved Document B updates by maintaining UKAS-accredited test reports that directly reference current fire resistance criteria. The company’s technical team pre-reviews project drawings to verify that glass thickness, frame construction (G.M.S. hollow steel sections), sealant types (ceramic wool, intumescent seals), and anchoring details (M6/M8 bolts at 300–600mm spacing) match the exact conditions under which the assemblies were tested. For Westminster projects, Antifires also cross-references local fire officer requirements and provides certified documentation that supports Building Control submissions. This proactive approach ensures that all fire rated glass systems meet the functional demands of fire separation while complying with the latest regulatory updates.