- lefter
- lender glazing
- lending library
- lengthening pipe
- lethal gas
- leucite syenite
- leveed area
- level datum
- level difference
- level error
- level mark
- level off
- level plug
- level road
- leveling board
- leveling coat
- leveling concrete
- leveling course
- leveling loop
- leveling method
- leveling net
- leveling point
- leveling staff
- leveling stake
- leveling work
- levelling error
- levelling rod
- levelling staff
- lever arm
- lever lock
- Liabilities
- liability
- life activity
- life cycle
- leakage paths
- lean mix
- lean stone
- lean-to
- learboard
- learning unit
- least error
- leather glue
- lecture room
- ledger
- ledger strip
- leeward slope
- left key
- leg
- leggings
- legibility distance
- legislation
- length
- length measurement
- lengthening piece
- lentous
- less than
- lethal
- letter code
- letter designation
- levee
- level
- level crossing
- level gauge
- level surface
- level theodolite
- level with
- leveled
- leveling
- leveling beam
- leveling operation
- leveling rod
- leveling traverse
- levelling
- levelling point
- levels control
- lever handle
- lever jack
- lever winch
- Levy facing
- libel
- liberal profession
- lie
- life float
- life raft
- life-jacket
- lifebelt
- lifeboat
- lifeline
- lift
- lift bogie
- lift bridge
- lift component
- lift gate
- lift latch
- lift line
- lift park
- lift pipe
- lift platform
- lift slab
- lift span