Under the reforms of the House of Lords Act 1999, the majority of hereditary peers lost the right to sit as members of the House of Lords, the upper house of the Parliament of the United Kingdom. Section 2 of the Act, however, provides an exception from this general exclusion of membership for up to 92 hereditary peers: 90 to be elected by the House, as well as the holders of two royal offices, the Earl Marshal and the Lord Great Chamberlain, who sit as ex officio members. The initial cohort of excepted hereditary peers were elected in the 1999 House of Lords elections. Between 1999 and November 2002, vacancies among this group were filled by runners-up in the 1999 election. Since then, by-elections to the House of Lords have filled vacancies.
Candidature for both the 1999 elections and subsequent by-elections is restricted to peers in the Peerages of England, Scotland, Great Britain and the United Kingdom. Peers in the Peerage of Ireland are only eligible for election if they hold a title in one of the other peerages, but if successful may use their Irish peerage title as a member of the House. The electorates are either the whole membership of the House of Lords (including life peers), or a party group of sitting hereditary peers. A standing order of the House, approved prior to the commencement of the House of Lords Act 1999, mandates that the 90 elected hereditary peers consist of:
By convention, whole-House elections elect members of the same affiliation as the departed peer.
These numbers elected by each group reflected the relative strengths of the parties among hereditary peers in 1999; this allocation has remained unchanged since then. The fifteen peers elected by the whole House were intended to provide a group of experienced members ready to serve as deputy speakers or other officers.
A small number of hereditary peers sit in the Lords by virtue of their being granted life peerages (see listing). These are not listed below.
The House of Lords (Hereditary Peers) Act 2026, which would expel the hereditary peers from the House, was passed in March 2026 after a compromise with the Conservative party which would allow some of their hereditary peers as well as some crossbench hereditary peers to remain in the house as life peers.
The Earl Marshal is an hereditary post held by the Duke of Norfolk.
The Lord Great Chamberlain is an hereditary office in gross post among the Cholmondeley, Heathcote-Drummond-Willoughby and Carington families.
In 1902 it was ruled by the House of Lords that the then joint office holders (the 1st Earl of Ancaster, the 4th Marquess of Cholmondeley, and the Earl Carrington, later Marquess of Lincolnshire) had to agree on a deputy to exercise the office, subject to the approval of the Sovereign. Should there be no such agreement, the Sovereign should appoint a deputy until an agreement be reached.
In 1912 an agreement was reached. The office, or right to appoint the person to exercise the office, would thereafter rotate among the three joint office holders and their heirs after them, changing at the start of each successive reign. Cholmondeley and his heirs would serve in every other reign; Ancaster and Carrington would each serve once in four reigns.
Pursuant to section 1 of House of Lords Reform Act 2014
Pursuant to section 1 of House of Lords Reform Act 2014
Pursuant to section 2 of House of Lords Reform Act 2014
Pursuant to section 1 of House of Lords Reform Act 2014
Pursuant to section 2 of House of Lords Reform Act 2014
, the party affiliations of the elected hereditary peers are as follows: