How to Say "lean-to" in Spanish
The Spanish word for “lean-to” is “cobertizo” — B1 level.
English → SpanishB1
nounB1
a simple roofed structure attached to a wall

Examples
Guardamos las herramientas en el cobertizo del jardín.
We keep the tools in the garden shed.
La leña está seca porque la dejamos bajo el cobertizo.
The firewood is dry because we left it under the lean-to.
El viejo cobertizo de madera colapsó durante la tormenta.
The old wooden shed collapsed during the storm.
It is a Masculine Noun
Since it ends in 'o', it is almost always masculine. You should use 'el' or 'un' with it (el cobertizo).
Plural Form
To talk about more than one, simply add an 's' to the end: 'los cobertizos'.
Confusing with 'Cubierta'
Mistake: “Usé una cubierta para guardar las herramientas.”
Correction: Usé un cobertizo para guardar las herramientas.
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