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.

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

BBA Certified

UKCA and CE Marked

LABC Compliant

ISO 9001 Compliant (Quality Control)

ISO 14001 Compliant (Environmental Management)

Thermally Efficient Design

Hi-Therm+ range provides up to 80% reduction in thermal bridging through integrated thermal breaks.

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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.

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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.

How we can support your project

Someone piecing together a brick slip arch.

As well as supplying the Keystone Lintels, we can also support with the following services:

Your questions answered

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.

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.