Information on profession from Dictionary iof Scottish Architects (family information provided by me R Wilson)

http://www.scottisharchitects.org.uk/architect_full.php?id=200392

Allan Stevenson was born on 11 September 1849 at Lady Yard Farm, Tarbolton, Ayrshire, the son of John Stevenson and Mary Ritchie Strawhorn. Nothing is yet known of his training, but he commenced practice in Ayr prior to 1876, and c. 1885 he was briefly in partnership with ____ Kair as Stevenson & Kair.

In 1885 Thomas McGill Cassels, born in 1869, was articled to Stevenson, attending classes at Ayr Academy. In 1890 he moved to the office of civil engineer Charles C Lindsay in Glasgow, leaving in the following year to become principal assistant to Peter Macgregor Chalmers, and studying at Glasgow School of Art and the Glasgow and West of Scotland Technical College throughout this period. He returned to Allan Stevenson's office in 1895 as managing assistant. It is not clear when he first became a partner, but he was still managing assistant at the time of his admittance as LRIBA in the mass intake of 20 July 1911. The practice did not become Allan Stevenson & Cassels until c. 1923, an event which probably marked Stevenson's death or retirement at what must have been a fairly advanced age. Cassels continued to use Stevenson's name in the practice's title thereafter. In later years the practice was taken over by Duncan McCulloch and subsequently by E A Darley, who formed the Darley Hay partnership; the Darley Hay archive was transferred to Ayrshire Archives in 2007 after the Darley Hay firm merged with Carricks to become Carricks Darley Hay.

Stevenson married to Mary Jane Campbell McIlwraith about 1877 and they had at least 5 children. He died in about 1929.

14, Cathcart Street, Ayr, Ayrshire, Scotland Business Before 1885 After 1915
56, Sandgate, Ayr, Ayrshire, Scotland Business 1926 *


1881 census
Dwelling:1 Dalblair Terrace
Census Place:Ayr, Ayr, Scotland
Source:FHL Film 0203589 GRO Ref Volume 578 EnumDist 6 Page 32
MarrAgeSexBirthplace
Allan STEVENSONM31 MTarbolton, Ayr, Scotland
Rel:Head
Occ:Architect
Mary Jane STEVENSONM27 FAyr, Ayr, Scotland
Rel:Wife
Jessie N. STEVENSONU2 FAyr, Ayr, Scotland
Rel:Daur
Mary STEVENSONU11 mFAyr, Ayr, Scotland
Rel:Daur
Ann MOONEYU20 FKilmarnock, Ayr, Scotland
Rel:Servant
Occ:General Servant

1891 census Ayr, Ayrshire
Address: 1 Dalblair Terrace (Dall Rd)
Allan Stevenson Head Mar 41 Architect born Tarbolton, Ayrshire
Mary Jane Stevenson Wife Mar 37Architect's Wife born Ayr
Jessie Hamilton H Stevenson Dau 12 Scholar born Ayr
Mary R S Stevenson Dau 10 Scholar born Ayr
Euphemia Stevenson Dau 8 Scholar born Ayr
Maud E Stevenson Dau 7 Scholar born Ayr
Jane Hervat Stevenson Dau 4 born Ayr
Janet Cameron Servant Unm 20 Dom.Serv. born Maybole, Ayr:
Mary Jane Lair Servant Unm 16 Dom.Serv. born Glasgow, Lanark
ED: 5 Household schedule number: 114 Line: 14 Roll: CSSCT1891_198

1901 Census Ayr Ayrshire
Address: 41 Castlehill Rd Largie Ho
Allan Stevenson Head M 31 Architect Civil Engineer Road Survegor b Tarbolton, Ayrshire
Mary Jane Stevenson Wife M 47 b Ayr, Ayrshire
Jessie H H Stevenson Daur S 22 St Eval, Ayrshire
Mary R H Stevenson Daur S 20 b Ayr, Ayrshire
Euphemea Stevenson Daur S 18 Scholar b Ayr, Ayrshire
Maud E Stevenson Daur S 16 Scholar b Ayr, Ayrshire
John Stevenson Son 7 Scholar b Ayr, Ayrshire
Mary Wilson Servant 25 Servant Domestic b Colmonell, Ayrshire
ED: 4 Household schedule number: 68 Line: 17 Roll: CSSCT1901_217

1. Jessie Hamilton Howat Stevenson b: 1878 in 1 Dalblair Terrace, Ayr, Ayrshire, Scotland
2. Mary Ritchie Strawhorn Stevenson b: 1880 in 1 Dalblair Terrace, Ayr, Ayrshire, Scotland
3. Euphemia Stevenson b: 1882 in 1 Dalblair Terrace, Ayr, Ayrshire, Scotland
4. Maud E Stevenson b: 1884 in 1 Dalblair Terrace, Ayr, Ayrshire, Scotland
5. Jane (Howat?) Stevenson b: 1886 in 1 Dalblair Terrace, Ayr, Ayrshire, Scotland
6. John Stevenson b: 1893 in Ayr, Ayrshire, Scotland