Steel Box Lintels and T Lintels

Our range of steel box lintels is suitable for almost all masonry wall openings, including internal door lintels in standard 100mm blockwork and wider solid wall construction. Designed to fit coursing and carry wet masonry loads, box lintels are the most common steel lintel used above door openings in domestic and light commercial projects.

We stock box lintels and T lintels from leading UK manufacturers including Catnic, Stressline and Birtley, available in multiple widths, duties and lengths to suit everything from lightweight partition walls to heavier load-bearing applications.
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  • Box Lintel
    Catnic Heavy Duty 100mm Box Lintel BHD100 by Catnic Catnic Heavy Duty 100mm Box Lintel BHD100 by Catnic
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    Catnic
    Catnic Heavy Duty 100mm Box Lintel BHD100 From £65.00 £54.17 (ex VAT)
    4.8
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  • Solid Wall 'T' Lintel
    Catnic 215mm Solid Wall 'T' Lintel CN50C / CN51C by Catnic Catnic 215mm Solid Wall 'T' Lintel CN50C / CN51C by Catnic
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    Catnic
    Catnic 215mm Solid Wall 'T' Lintel CN50C / CN51C From £88.00 £73.33 (ex VAT)
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  • Solid Wall Box Lintel
    Catnic CN71A 215mm Solid Wall Box Lintel by Catnic Catnic CN71A 215mm Solid Wall Box Lintel by Catnic
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    Catnic
    Catnic CN71A 215mm Solid Wall Box Lintel From £91.00 £75.83 (ex VAT)
    4.6
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  • Box Lintel
    Catnic BSD100 100mm Box Lintel by Catnic Catnic BSD100 100mm Box Lintel by Catnic
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    Catnic
    Catnic BSD100 100mm Box Lintel From £59.00 £49.17 (ex VAT)
    4.4
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  • Solid Wall Box Lintel
    Birtley Medium Duty 215mm Solid Wall Box Lintel SBL200 by Birtley Birtley Medium Duty 215mm Solid Wall Box Lintel SBL200 by Birtley
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    Birtley
    Birtley Medium Duty 215mm Solid Wall Box Lintel SBL200 From £66.00 £55.00 (ex VAT)
    4.8
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  • Box Lintel
    Stressline Standard Duty 100mm Box Lintel SL100BOX by Stressline Stressline Standard Duty 100mm Box Lintel SL100BOX by Stressline
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    Stressline
    Stressline Standard Duty 100mm Box Lintel SL100BOX From £35.00 £29.17 (ex VAT)
    5.0
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  • Solid Wall Box Lintel
    Stressline Standard Duty 215mm Solid Wall Box Lintel SL200BOX by Stressline Stressline Standard Duty 215mm Solid Wall Box Lintel SL200BOX by Stressline
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    Stressline
    Stressline Standard Duty 215mm Solid Wall Box Lintel SL200BOX From £72.00 £60.00 (ex VAT)
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  • Solid Wall Box Lintel
    Catnic Heavy Duty (Longer Lengths) 215mm Solid Wall Box Lintel CN81C by Catnic Catnic Heavy Duty (Longer Lengths) 215mm Solid Wall Box Lintel CN81C by Catnic
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    Catnic
    Catnic Heavy Duty (Longer Lengths) 215mm Solid Wall Box Lintel CN81C From £394.00 £328.33 (ex VAT)
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  • Box Lintel
    Catnic Extra Heavy Duty 100mm Box Lintel BXD100 by Catnic Catnic Extra Heavy Duty 100mm Box Lintel BXD100 by Catnic
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    Catnic
    Catnic Extra Heavy Duty 100mm Box Lintel BXD100 From £106.00 £88.33 (ex VAT)
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  • Box Lintel
    Stressline Heavy Duty 100mm Box Lintels SL100BOXHD by Stressline Stressline Heavy Duty 100mm Box Lintels SL100BOXHD by Stressline
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    Stressline
    Stressline Heavy Duty 100mm Box Lintels SL100BOXHD From £57.00 £47.50 (ex VAT)
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  • Solid Wall Box Lintel
    Catnic CN81B 215mm Solid Wall Box Lintel by Catnic Catnic CN81B 215mm Solid Wall Box Lintel by Catnic
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    Catnic
    Catnic CN81B 215mm Solid Wall Box Lintel From £363.00 £302.50 (ex VAT)
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  • Solid Wall 'T' Lintel
    Stressline SL200T Standard Duty 215mm Solid Wall T Lintel by Stressline Stressline SL200T Standard Duty 215mm Solid Wall T Lintel by Stressline
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    Stressline
    Stressline SL200T Standard Duty 215mm Solid Wall T Lintel From £85.00 £70.83 (ex VAT)
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  • Solid Wall Box Lintel
    Catnic Heavy Duty (Shorter Lengths) 215mm Solid Wall Box Lintel CN71C by Catnic Catnic Heavy Duty (Shorter Lengths) 215mm Solid Wall Box Lintel CN71C by Catnic
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    Catnic
    Catnic Heavy Duty (Shorter Lengths) 215mm Solid Wall Box Lintel CN71C From £131.00 £109.17 (ex VAT)
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  • Solid Wall 'T' Lintel
    Stressline Heavy Duty 215mm Solid Wall 'T' Lintel SL200CH by Stressline Stressline Heavy Duty 215mm Solid Wall 'T' Lintel SL200CH by Stressline
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    Stressline
    Stressline Heavy Duty 215mm Solid Wall 'T' Lintel SL200CH From £183.00 £152.50 (ex VAT)
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  • Box Lintel
    Stressline Extra Heavy Duty 100mm Box Lintel SL100BOXXHD by Stressline Stressline Extra Heavy Duty 100mm Box Lintel SL100BOXXHD by Stressline
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    Stressline
    Stressline Extra Heavy Duty 100mm Box Lintel SL100BOXXHD From £110.00 £91.67 (ex VAT)
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For internal partition walls solid wall lintels, whether 75mm, 100 or 150mm, box lintels are a good choice, designed to take nominal loads in a lightweight domestic setting, to concrete floors and attic trusses in a heavier load setting.

Box lintels are slotted to take a plaster finish. Be sure to order an insulation-filled box section if the lintel is to be built into the leaf of an external wall and is part of the thermal envelope.

External solid wall box lintels have a flat lip to support the facing masonry and will have insulation within the box too.

T lintels are shaped like an upside-down letter T and are designed to take two leaves of a fair-faced brick or block wall while remaining almost invisible.

Steel is often cheaper than concrete and has a better load bearing capability too. When you need a lintel to be discreet, choose a T-lintel, or for a lintel that will take plaster well, a steel box section will do the job.

Catnic Steel Box Lintels

Catnic were the first to bring steel lintels to the UK construction market back in the 1960s and the company has built on its time-served experience ever since. Today Wade stocks Catnic box and T lintels for almost every imaginable specification.

Their solid wall lintels come in different grades to fit larger or smaller spans and all are galvanised and powder-coated.

Stressline Box Steel Lintels

Stressline is another British company that started in the 1960s, producing a range of concrete lintels. Their story is one of innovation as Stressline is credited with making the first thermally broken steel lintel in 1991.

Their T-lintels are almost I-beams in that their shape is similar, as in the bottom (top) of the T is folded back on itself. This added piece of engineering design means that this lintel is capable of spanning nearly five metres.

Birtley Steel Box Lintels

Today the Birtley Group includes the specialist Expamet masonry accessories supplier and has a reputation as a market leader in galvanisation of its products. If your project is in a coastal location where anti-corrosion performance is important, check out their range of box steel lintels.

UK Building Regulations are always being updated and the Future Homes Standard requires all thermal lintels to bring down emissions by 75-80%. At Wade, all our lintel products already conform and are therefore future-proof.

Choosing a Box Lintel for an Internal Door

For standard internal masonry walls constructed in 100mm blockwork, a 100mm steel box lintel is typically specified. Always check span tables and load requirements before selecting the appropriate duty rating.