Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A lintel is a horizontal reinforced concrete member over door and window openings in blockwork that carries the blocks above. It is cast in place or precast, and bears into the wall on each side, usually by at least 15 to 20 cm.
Why it matters on a project
A missing lintel or short bearing causes diagonal cracks above openings, among the most visible defects in new buildings.
Measurement and pricing
Usually per linear metre for each section, or concrete in cubic metres with steel in tonnes.
Worked example
A 1.5 m wide window with 20 cm bearing each side: lintel length 1.5 + 2 × 0.20 = 1.9 m.
Common mistake
Relying on the door frame or aluminium window frame to carry the blocks above the opening without a lintel.
Frequently asked questions
Does every opening need a lintel?
Yes in blockwork, unless the opening sits directly under a concrete beam.
Are precast lintels acceptable?
Yes if designed for the load and with enough bearing.
Related terms
- BlockworkBuilding walls with solid, hollow or insulated concrete blocks.
- Door and window scheduleA table giving the code, size and specification of every door and window.
- Precast concreteConcrete elements made in a factory then transported and erected on site.
- Plaster (render)A cement or gypsum layer applied to walls to level them before paint or cladding.
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