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| Label énergétique (m) | Energieverbrauchskennzeichnung (f) | Energy labelling | Etichettatura energetica | Etiquetado energético (m) | |
| Lacune (f) | Lücke (f) | Cavity / Void / Gap | Lacuna (f) | Laguna (f) / Vacío (m) | Lacuna (f) / Espaço (m) |
| Laiton (m) | Messing (nt) | Brass | Ottone (m) | Latón (m) / Bronce m | Latão (m) / Bronze (m) / Cobre (m) |
| Lambris (m) | Lambris (m/f) | Dado / Panelling / Panel | Lambrí | Revestimiento de zócalo interior (m) | |
| Lambrissage en petites planches / Bardage chanfreiné (m) | Fastäfer (m) / Fasenverkleidung (f) | Chamfered / Grooved cladding | Rivestimento smussato (m) | Revestimiento biselado (m) | |
| Lame de crochet coudée (f) | Schrages Hakenblatt (nt) | Oblique hooked Scarf joint / Dovetail scarf joint | Lama angolata del gancio (f) | Cuchilla de gancho angular (f) | |
| Lame droite à crochet (f) | Gerades Hakenblatt (nt) | Tabled scarf joint | Lama ad uncino dritto | Cuchilla de gancho recta (f) | |
| Lampe (f) | Lampe (f) | Lamp / Light bulb | Lume | Lámpara (f) / Farol (m) | |
| Lanterne (f) / Lanterneau de toit (m) | Laterne (f) / Dachlaterne (f) | Lantern / Roof lantern | Lanterna del tetto (f) | Linterna (f) / Linterna de techo (f) | Lanterna (f) / Lanterna de teto (f) |
| Laque (coloré) (f) | Farblack (m) | Varnish (coloured) | Lacca (colorato) (f) | Laca (colorido) (f) | |
| Laque (f) / Vernis (m) | Lack (m) | Lacquer / Varnish | Lacca (f) | Laca (f) / Barniz (m) / Lacado (m) | Laca (f) / Verniz (m) |
| Largeur (f) | Breite (f) | Width | Larghezza (f) | Anchura (f) | |
| Largeur de l'escalier (f) | Laufbreite (f) / Treppenlaufbreite (f) / Treppenbreite (f) | Staircase width | Larghezza della scala (f) | Ancho de la escalera (m) | Largura da escada (f) |
| Lasure (f) / Teinture pour bois (f) | Holzbeize (f) / Beizen (nt) | Wood stain / Stain | Mordente per legno (m) | Acabado de madera (m) / Tinte para madera (m) | |
| Latte (f) / Barre (f) | Latte (f) | Slat | Latte / Assicella (f) | Listón (m) / Lata (f) | Ripa (f) |
| Levier (m) Bras de levier (m) | Hebelarm (m) | Lever / Lever arm / Cantilever arm | Braccio di leva / Leva | Brazo de palanca (m) | |
| Levier de montage (m) | Geissfuss (m) (CH) / Montagehebel (m) (DE) | Mounting lever/bar | Leva di montaggio | Palanca de montaje (f) | |
| Liaison (f) | Bindung (f) | Binding / Cohesion | Legame (m) | Cohesión (m) | |
| Liant (m) | Bindemittel (nt) | Binder | Legante (m) | Aglutinate (m) | |
| Lien de base (m) | Fussband (nt) | Foot brace | Piccolo contraffisso di piede | Unión pie derecho-solera (f) | |
| Lien de tension (m) | Läuferverband (m) | Stretcher bond / Stretching bond | Legante per barella | Bono de camilla (m) | Laço de maca (m) |
| Ligne de fond (f) | Grundleitung (f) | Main line | Linea di terra | Línea de tierra (f) | |
| Ligne de marche (f) | Lauflinie (f) / Treppenlauflinie (f) / Stiegenlauflinie (f) / Gehlinie (f) | Tread line / Walking line | Bastone da passeggio | Hilo conductor (m) | Linha de caminhada (f) |
| Linteau (m) | Türsturz (m) | Lintel | Architrave (m) | Dintel (m) | |
| Linteau (m) | Sturz (m) | Lintel | Architrave | Dintel (m) | |
| Linteau arrière (m) | Hintersturz (m) | Rear lintel | Architrave posteriore | Cumbrera trasera (f) | |
| Linteau de fenêtre (m) | Fenstersturz (m) | Window lintel | Defenestrazione / Architrave della finestra | Defenestración (f) / Dintel de ventana (m) | |
| Linteau de secours (m) | Entlastungssturz (m) | Safety lintel | Architrave in rilievo (m) | Dintel en relieve (m) | |
| Liquide (m) / Fluide (m) | Flüssigkeit (f) | Liquid / Fluid | Fluida (f) | Líquido (m) / Fluido (m) | |
| Liseré de lucarne (m) | Gaubeneinfassung (f) | Dormer edging / Dormer frame | Bordatura abbaino (f) | trama de buhardilla (f) | |
| Lisière (f) | Einfassung (f) | Border / Edging / Mount | Confine | Borde (m) | |
| Liston vitré / Cordon de vitrage (m) | Glasleiste (f) | Glass strip / Glazing strip | Barra vitrea / Fermavetro | Batiente vitreo / Talón del cristal | |
| Lit de mastic (m) | Kittbett (nt) | Putty bed | Stucco letto (m) | Cama de masilla (f) | |
| Loggia (f.) | überdachte Loggia (f.) | Loggia / Recessed balcony | Loggia (f.) | Logia (f.) | |
| Longue connexion (f) | Langsverbindung (f) | Long connection / Longitudinal connection | Collegamento lungo (m) | Larga conexión (f) | |
| Longueur (f) | Länge (f) | Length | Lunghezza | Longitud (f) | |
| Loquet (m) | Riegel (m) | Latch / Bar / Bolt | Chiavistello | Pestillo (m) | |
| Loquet de verrouillage (m) | Falle (f) / Schlossfalle (f) | Latch | Serratura | Pestillo (m) | |
| Lucarne (f) / Chien-en-lit / Chien-assis | Dachgaube (f) / Gaube (f) | Dormer (of a roof) | Abbaino | Buhardilla (f) | |
| Lumen (m) | Lumen (nt) | Lumen | Lumen | Lumen (m) | Lúmen |
| Luminosité (f) / Clarté (f) / Luminance (f) | Helligkeit (f) | Brightness / Light | Brillantezza (f) / Chiarezza (f) | Brillo (m) / Luminosidad (f) | |
| Lésène (f) / Pilastre (m) | Lisene (f) / Mauerblende | Pilaster strip | Lesena (f) / Lesene | Tira de pilastra (f) / Lesena (f) | Tira de pilastra (f) |
| lessiver | auswaschen (v) | leach out / wash out | dilavare | deslavar | |
| lessiver | auslaugen (v) | leach out / dry out | lisciviare | lixivar | |
| levier inclinable (90°) | Ausstellerhebel umlegbar (90°) | lever reversible (90°) | leva inclinabile (90°) | palanca inclinable (90°) | |
| lier | binden (v) | bind | legare | ligar | |
| liston, moulure | Schlagleiste | baffle plate | listello | franja | |
| loquet (m), serrure à ressort (f) | Schnappschloss (s) | snap-in lock, snap lock, clasp lock, spring lock | serratura a scatto (f) | cerradura de resorte (f) | |
| lucarne (f) | Lukarne (f) / Dachluke (f) | Skylight | abbaino (m) | lumbrera (f) / tragaluz (m) | Claraboia (f) / Escotilha de tejadilho (f) |