Born in Leeds, West Yorkshire, Oastler was the youngest of ten children born to Sarah (a daughter of Joseph Scurr) and Robert Oastler, a linen merchant.
Robert continued to live in Leeds when he later became steward for Thomas Thornhill, the absentee landlord of Fixby, a large estate near Huddersfield, and of Calverley (between Leeds and Bradford, to the north of both).
When Richard was six, his twelve-year-old brother Robert died as a result of a fire in a flax mill.
 Richard attended a Moravian boarding school from 1798 to 1806 ("It was there that I learned to be bold, for I was taught there to fear nothing but sin"), and then (his father vetoing Richard's desire to become a barrister) started training to become an architect.

After four years his failing sight forced him to give this up; in 1810 he became a commission agent, dealing in oils and dry-saltery: he also acted as a steward for the Dixons of Gledhow Hall near Leeds, and was used by his father from time to time to carry out work for the Fixby estate (as when in 1812 he organised precautions against the Luddites).
He became involved in charity work in Leeds; sick visiting with Michael Thomas Sadler and organising charitable relief of the destitute.
In 1816, he married Mary Tatham, daughter of Mary (née Strickland, from Leeds) and Thomas Tatham, a Nottingham grocer.
Richard and Mary had two children, both of whom had died by 1819.
Early in 1820 he went bankrupt; later that year on the death of his father, he was invited to succeed him as steward of the Fixby estate, looking after a rent roll of £18,000 per year, on an annual salary of £300.
He accepted, moving to Fixby Hall in 1821.
When in 1827 the vicar of Halifax (in which parish Fixby lay) attempted to increase his income by 'resuming' collection of various tithes which he claimed to be 'customary', Oastler was prominent in opposition.
He later claimed that it was this struggle that had broken his health, leaving him liable to periodic breakdowns in health.
Born in Leeds, West Yorkshire, Oastler was the youngest of ten children born to Sarah (a daughter of Joseph Scurr) and Robert Oastler, a linen merchant. Robert continued to live in Leeds when he later became steward for Thomas Thornhill, the absentee landlord of Fixby, a large estate near Huddersfield, and of Calverley (between Leeds and Bradford, to the north of both). When Richard was six, his twelve-year-old brother Robert died as a result of a fire in a flax mill.  Richard attended a Moravian boarding school from 1798 to 1806 ("It was there that I learned to be bold, for I was taught there to fear nothing but sin"), and then (his father vetoing Richard's desire to become a barrister) started training to become an architect.
After four years his failing sight forced him to give this up; in 1810 he became a commission agent, dealing in oils and dry-saltery: he also acted as a steward for the Dixons of Gledhow Hall near Leeds, and was used by his father from time to time to carry out work for the Fixby estate (as when in 1812 he organised precautions against the Luddites). He became involved in charity work in Leeds; sick visiting with Michael Thomas Sadler and organising charitable relief of the destitute. In 1816, he married Mary Tatham, daughter of Mary (née Strickland, from Leeds) and Thomas Tatham, a Nottingham grocer. Richard and Mary had two children, both of whom had died by 1819. Early in 1820 he went bankrupt; later that year on the death of his father, he was invited to succeed him as steward of the Fixby estate, looking after a rent roll of £18,000 per year, on an annual salary of £300. He accepted, moving to Fixby Hall in 1821. When in 1827 the vicar of Halifax (in which parish Fixby lay) attempted to increase his income by 'resuming' collection of various tithes which he claimed to be 'customary', Oastler was prominent in opposition. He later claimed that it was this struggle that had broken his health, leaving him liable to periodic breakdowns in health.
Richard Oastler