Career
However, two days before the Parliament met his father was raised to an Earldom. This meant that, as his heir, William acquired the courtesy title Lord Howard of Effingham. However, the same mistake was not made at the next election and William represented Surrey in the Parliament of 1601.
In 1603, he was summoned to the House of Lords in his father"s barony by a writ of acceleration, and sat as a peer until his death.
However, he died before his father, without male issue. Howard married Ann Street John, daughter of John Street John, 2nd Baron Street John of Bletso, on 7 February 1597: they had one daughter, Elizabeth (1603–1671), who married John Mordaunt, 1st Earl of Peterborough.
He died in 1615, aged only 37, at Hampton in Middlesex.