--- title: Keystone Lintels date: 2025-10-16T13:04:00+01:00 author: Sarah Wills canonical_url: "https://brickability.co.uk/keystone-lintels" section: Products --- Brackets and Support Structures # Keystone Lintels Keystone Lintels are engineered to deliver reliable structural support while enabling design flexibility and visual detailing across a building’s facade. Alfiam supplies a wide range of Keystone Lintels in their depot which are available straight away. - ![A brickwork arch.](https://brickability.co.uk/uploads/images/_669x453_crop_center-center_none/177811/rb_Maxwell-Road_1579.jpg) - ![A gable front of a red brick building featuring a round window.](https://brickability.co.uk/uploads/images/_669x453_crop_center-center_none/177814/rb_Disraeli-Park_4889.jpg) - ![A red brick house with a large stone pergola projecting from the rear into the garden.](https://brickability.co.uk/uploads/images/_669x453_crop_center-center_none/178638/2_2025-11-04-124915_inso.jpg) - ![A picture of a window with a curved stone header made possible by a lintel.](https://brickability.co.uk/uploads/images/_669x453_crop_center-center_none/178639/Untitled-design_2025-11-04-125218_kpdi.jpg) As the UK’s leading manufacturer of steel lintels, Keystone provides a complete range of standard, heavy duty and bespoke solutions for residential and commercial builds. Each lintel is precision-engineered for strength, thermal performance and construction efficiency, ensuring consistent quality paired with long-term durability. The range also includes bespoke options that allow architects and builders to create striking brickwork details and design features without compromising structural integrity. With advanced manufacturing, responsive technical support and dependable delivery, Keystone helps achieve efficient, high-quality and visually impactful projects. ## Key Benefits ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## BBA Certified ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## UKCA and CE Marked ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## LABC Compliant ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## ISO 9001 Compliant (Quality Control) ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## ISO 14001 Compliant (Environmental Management) ![Key Benefit Tick](https://brickability.co.uk/uploads/images/icons/Key-Benefit-Tick.svg) ## Thermally Efficient Design Hi-Therm+ range provides up to 80% reduction in thermal bridging through integrated thermal breaks. 01 / 03 - ## Standard Lintels Keystone Lintels offers a wide range of galvanised steel lintels designed to provide reliable support for masonry above openings in residential and commercial projects. All Keystone standard lintels satisfy the thermal performance requirements of UK Building Regulations and are manufactured to meet the relevant British and European standards. With robust construction, proven performance, and a broad selection of sizes and load capacities, Keystone standard lintels ensure dependable installation and long-lasting support on site. Alfiam stocks a range of standard lintels. - ## Heavy Duty Lintels Keystone Heavy Duty Lintels are designed for projects that require greater load-bearing strength and performance. Precision-engineered from high-quality steel, they provide reliable support for large openings and demanding structural conditions in both residential and commercial construction. With a wide choice of profiles and capacities, Keystone Heavy Duty Lintels deliver consistent quality, long-term durability and easy installation across a range of building applications. - ## Hi-Therm The Hi-Therm Lintel is a market-leading solution designed to improve energy efficiency by reducing thermal bridging in external walls. Combining the strength of steel with an integrated thermal break, it delivers excellent structural performance while helping buildings meet Part L regulations. Ideal for new homes and low-energy projects, the Hi-Therm Lintel supports a fabric-first approach to sustainable construction and can significantly reduce heat loss when compared to standard steel lintels. - ![A 3D rendered image of a cut through a wall to demonstrate the structure of a standard Keystone lintel.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/rb_SK-90-Standard-Load-Product-Render_317-Large.jpg) - ![A 3D rendered image of a cut through wall to demonstrate how a Heavy Duty Lintel works.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/rb_HD-K90-Heavy-Duty-Load-Product-Render_318-Large.jpg) - ![A 3d illustration demonstrating how a lintel works in construction.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/177855/rb_Hi-therm-Lintel-Product-Render_1222.jpg) 01 / 04 - ## Keyslip Brick Feature Lintels Keyslip Brick Feature Lintels provide a fast and reliable way to achieve high-quality brick detailing without the need for traditional masonry support. Each lintel is precision-engineered to bond brick slips securely, creating seamless arches, soffits and other decorative features that enhance facade design. Designed for accuracy, strength and visual appeal, Keyslip Lintels simplify installation, reduce on-site labour and deliver consistent, design-led finishes for modern construction projects. - ## Special and Bespoke lintels Keystone Special Lintels are custom-engineered to bring complex architectural designs to life. From arches and bays to unique shapes and decorative features, each lintel is precision-manufactured to meet the structural and aesthetic requirements of the project. Working closely with architects, engineers and contractors, Keystone can provide tailored solutions that combine creative freedom with reliable performance and buildability. - ## Windposts Keystone Windposts provide additional support to masonry walls, improving stability and resistance to lateral wind loads. Each unit is precision-manufactured from stainless or galvanised steel in accordance with BS EN 845-2 standards, ensuring long-term strength and corrosion protection. Available in multiple profiles and fixing configurations, Keystone Windposts offer versatile design options and dependable performance for both new build and refurbishment projects. - ## NCCTL – Non-combustible Cavity Tray Lintel The Keystone NCCTL is a Class A1 non-combustible stainless steel single-leaf lintel with an integrated cavity tray, designed for use with an exterior masonry skin and a non-masonry inner leaf such as steel frame systems. It provides a compliant solution for buildings over 11m and features mechanically fixed watertight stop-ends for reliable performance. Manufactured in Grade 304 stainless steel, with Grade 316 available for coastal locations, the NCCTL supports standard load-bearing applications and enables straightforward installation on site. - ![A 3D illustration of a round window opening demonstrating how a lintel supports the brickwork.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/rb_Full-Bullseye-Arch-Brick-Slip-Feature-Lintel-Product-Render_380-Large.jpg) - ![A castle-like, large, gothic home.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/177860/rb_Gothic-Arch-Lintels_1905.jpg) - ![A 3d illustration demonstrating how a windpost comes together in construction.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/rb_U-Windpost-Product-Render_395.jpg) - ![A 3D illustration demonstrating how a cavity tray fits within a wall in construction.](https://brickability.co.uk/uploads/images/_638x437_crop_center-center_none/177864/rb_NCCTL-Non-Combustible-Cavity-Tray-Lintel_8985-1.jpg) ## How we can support your project ![Someone piecing together a brick slip arch.](https://brickability.co.uk/uploads/images/_532x338_crop_center-center_none/177913/Wellington-Court-3-Large.jpg) As well as supplying the Keystone Lintels, we can also support with the following services: - ![Brickability Icon Design and Spec](https://brickability.co.uk/uploads/images/icons/Brickability-Icon__Design-and-Spec.svg) ## [Design and Specification](https://brickability.co.uk/design-specification) - ![Brickability Icon Technical Support](https://brickability.co.uk/uploads/images/icons/Brickability-Icon__Technical-Support.svg) ## [Technical Support](https://brickability.co.uk/technical-support) - ![Brickability Icon Stocked Products](https://brickability.co.uk/uploads/images/icons/Brickability-Icon__Stocked-Products.svg) ## [Depots](https://brickability.co.uk/stocked-products) ## Your questions answered What technical support is available with Keystone Lintels? We can organise a take-off and scheduling service through Keystone that will identify the type and quantity of lintels your project will need. This service can also plot your lintel requirements in a variety of building types and across all floors. All you need to supply is a set of drawings! Depending on your project, an engineer can also be sent to site to provide additional support and technical guidance. What are the key benefits and accreditations of Keystone Lintels? Keystone Lintels are: • BBA Certified • UKCA and CE Marked • LABC Compliant • ISO 9001 Compliant (Quality Control) • ISO 14001 Compliant (Environmental Management) • Designed for thermal efficiency: The Hi-Therm+ range provides up to 80% reduction in thermal bridging through its integrated thermal breaks. Are Keystone Lintels sustainable? Yes, Keystone Lintels support sustainable construction through energy-efficient design and responsible manufacturing. The Hi-Therm Lintel range is specifically engineered to reduce thermal bridging in external walls, helping buildings meet Part L regulations and improve overall energy performance. By combining structural strength with integrated thermal breaks, Keystone provides a simple, effective way to lower heat loss and support a fabric-first approach to sustainability. What is a lintel in construction? A lintel is a horizontal support used in construction to span openings such as doors and windows. It carries the load from the structure above and transfers it to the surrounding masonry. Lintels can be made from steel, concrete, timber or stone, with steel lintels being the most common in modern construction. What are window lintels? Window lintels are structural supports installed above window openings to carry the weight of the wall or structure above. Keystone manufactures a wide range of steel window lintels designed for strength, durability and ease of installation. They are used in both residential and commercial construction to ensure structural stability and compliance with building regulations. What are lintels made of? Lintels can be made from steel, concrete, timber or stone. Keystone Lintels are made from high-quality galvanised steel, offering excellent load-bearing strength, corrosion protection and long-term durability. Steel lintels are widely used in modern construction due to their lighter weight, design flexibility and consistent performance. What size lintel do I need? The correct lintel size depends on the width of the opening, the type of wall, and the load above. Keystone offers a wide range of standard and heavy-duty lintels to suit different structural requirements. For accurate selection, speak to a structural engineer or discuss your project requirements with one of our teams. ## Be Inspired - ![Rb Killeavy Castle 5115](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/177903/rb_Killeavy-Castle_5115.jpg) - ![Rb Myrtlefield Park 5104 Large](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/177904/rb_Myrtlefield-Park_5104-Large.jpg) - ![Rb Burley House 5020](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/177902/rb_Burley-House_5020.jpg) - ![Wellington Court 5 Large](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/177906/Wellington-Court-5-Large.jpg) - ![Rb Boxworth Road 6554](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/rb_Boxworth-Road_6554.jpg) - ![Rb Oxshott Rise 5065 Large](https://brickability.co.uk/uploads/images/_636x414_fit_center-center_none/rb_Oxshott-Rise_5065-Large.jpg) 01 / 06 ## Speak to the team Our Alfiam team will be happy to advise on all Keystone Lintel products [01483 921040](tel:01483921040) [Fill out our quick form](https://brickability.co.uk/contact?enquiryType=new-enquiry) ![](/dist/images/decor/watermark--map-uk-tiny@2x.png)## Visit us Our depot team can provide help and advice and show you our range of products. [Our location](https://brickability.co.uk/locations?businessId=96)