Profile: L & L Installations Ltd. manufactures & installs conservatories, doors, windows, secondary glazing and roof line products. Our product line includes entrance, folding, french, stable, patio & back doors, casement, sash, tilt & turn windows, gutters and downpipes. Our single & double door comes with an 11 point locking system incorporating shoot bolts, hook bolts, rollers and a dead locks.