105 seats in the Canadian Senate. Seats are divided among provinces and territories and can only change with a constitutional amendment, or a constitutional provision that allows seats to change based on certain conditions. Beyond the constitutional allotment of Senate seats per province, the seats are grouped into four regions of 24 seats. Provisions under section 26 of the Constitution Act exist to add up to two extra seats per region, with no more than 113 members allowed to sit in the Senate. Senators have the same constitutional provisions to offer services as members of the House of Commons. This includes a rarely used provision to maintain a constituency office. Three senators currently have such offices. Two of the three have not designated themselves to a specific division, but to represent their province as a whole. While constituency offices are rare, all senators maintain an office on Parliament Hill. Evolution of Senate seats Note: 1870 The Manitoba Act, 1870 allows for two Senate seats with an expansion up to four adding seats at 50,000 and 75,000 population. 1871 The British Columbia terms of Union, 1871 provides three seats for British Columbia 1873 Under the Prince Edward Terms of Union 1873 Prince Edward Island was given four seats. New Brunswick and Nova Scotia lost two seats to decrease when the first two senators leave office. 1873 New Brunswick Senator William Steeves dies, dropping New Brunswick to 11 seats 1873 Nova Scotia Senator John Locke dies, dropping Nova Scotia to 11 seats. 1874 New Brunswick Senator Robert Hazen dies, dropping New Brunswick to 10 seats 1874 Nova Scotia Senator Ezra Churchill dies, dropping Nova Scotia to 10 seats 1879 Northwest Territories granted 2 seats. 1882 Manitoba reaches the population requirements for its third seat, it gained its fourth in 1889. 1903 Northwest Territories granted 2 additional seats. 1905 Saskatchewan and Alberta are created from the Northwest Territories with 4 seats each, under the Saskatchewan and Alberta Act's Northwest Territories loses 4 seats. 1915 the Western provinces division was created and the seats of the four western provinces were set to six each. 1949 Newfoundland & Labrador joined Confederation, and was allotted six seats. 1975 The Yukon is granted its first seat, and the Northwest Territories re-gains one seat after 70 years. 1999 Nunavut was created from the Northwest Territories and allotted one seat. Quebec regional division The Quebec regional division was created