Business Details
Trusted Cavity Closer Supplier in Derby
Subframes is a leading manufacturer and supplier of cavity closers in the United Kingdom. Established with a commitment to innovation and quality, we operate from a 30,000sqft factory in the Midlands, producing high-performance cavity closers for commercial and residential projects. Our products are designed to meet rigorous building regulations, including Part L thermal efficiency and fire safety standards. We partner with renowned brands like Cavalok, Kingspan, and Dacatie to offer a comprehensive range of solutions.Our team of experts provides bespoke services, ensuring tailored specifications for unique architectural designs. With nationwide delivery and a focus on sustainability, we prioritise durability, energy efficiency, and compliance. Our ISO 9001 certification underscores our dedication to quality control. We serve builders, window manufacturers, and contractors, offering technical support and competitive pricing. Our reputation as industry pioneers is built on decades of experience and customer-centric service.
Services
Cavity Closers
Custom Closers
Fire-Rated Closers
Structural Door Packs
Vented Heads
Thermal Insulation
Nationwide Delivery
Technical Support
Bespoke Manufacturing
BBA Certified Products
Highlights and features
- We are the UK's largest supplier of welded and mechanically joined cavity closers.
- Our ISO 9001 certification guarantees rigorous quality control standards.
- We partner with leading brands like Kingspan and Cavalok for superior product range.
- Nationwide delivery ensures timely project completion across the UK.
- Our team offers expert technical support and bespoke design solutions.
Associations and certifications
- ISO 9001
- BBA
What people say
Market leaders
Excellent service
Prompt delivery
Quality products
Industry specialists
Services
Cavity Closers
Cavity closers seal gaps around window and door openings in cavity walls. They prevent heat loss and moisture ingress, ensuring compliance with Part L building regulations. Our products are made from durable uPVC with insulated cores, suitable for masonry, timber, and steel frames. They enhance energy efficiency and fire safety.
Fire-Rated Closers
Fire-rated cavity closers restrict fire spread through wall openings. Tested to meet 30-60 minute fire ratings, they are ideal for escape routes and high-risk areas. Compliant with Part B regulations, these closers integrate thermal efficiency with safety, preventing smoke and flame penetration during emergencies.
Custom Closers
Custom cavity closers are tailored to unique architectural designs. Available in 2, 3, or 4-sided configurations, they accommodate circles, arches, and irregular shapes. Our team works with site plans to ensure precise fitting for complex projects, maintaining thermal performance and structural integrity.
Structural Door Packs
Structural door packs include cavity closers with foam inserts for entrance doors. They allow direct fixing through door frames, eliminating movement post-installation. These packs combine thermal efficiency with damp-proofing, providing secure installations for French, patio, and bi-fold doors in residential and commercial settings.
Vented Heads
Vented heads integrate Titan ventilators into cavity closers for airflow management. They maintain thermal efficiency while preventing condensation. Suitable for window overhead sections, these vents comply with building regulations, ensuring balanced ventilation and energy conservation in residential and commercial buildings.
People
Dean Cossey
Managing Director
Dean Cossey leads Duraflex, a long-standing partner of Subframes. He recognises Subframes as market leaders in cavity closer manufacturing, praising their craftsmanship and attention to detail in serving the UK construction industry.
Martin Benn
Head of Eurocell New Build
Martin Benn endorses Subframes as a premier Cavalok fabricator. He highlights their adherence to quality standards and service excellence, ensuring alignment with Eurocell's reputation for innovative uPVC solutions and sustainability.
Questions
What are cavity closers used for?
Cavity closers seal gaps around window and door openings in cavity walls. They prevent moisture ingress, reduce heat loss, and improve fire safety, ensuring compliance with UK building regulations.
Are cavity closers required by building regulations?
Yes, Part L regulations mandate cavity closers to prevent thermal bridging. Part B requires fire-rated closers in specific areas. They ensure energy efficiency and fire safety compliance.
Can I get custom cavity closers?
Yes, Subframes UK offers bespoke cavity closers tailored to architectural designs. We manufacture 2, 3, or 4-sided frames in custom shapes, ensuring precise fitting for unique projects.
Do you supply fire-rated cavity closers?
Yes, we provide fire-rated cavity closers tested to 30-60 minute standards. These products meet Part B regulations, offering enhanced safety for critical building areas like escape routes.
How are cavity closers installed?
Cavity closers are fitted before (first fix) or after (second fix) wall construction. We provide installation guides and technical support to ensure proper sealing and compliance with building standards.
What materials are cavity closers made from?
Our cavity closers use uPVC with insulated cores. Materials include recycled PVC-U for sustainability and mineral wool in fire-rated options, ensuring durability and compliance with thermal and safety regulations.
