 James also designed St. Mary's Church, Rotherhithe in 1714–15 and St Lawrence, Whitchurch near Edgware around the same time.He also re-clad the medieval tower of St Margaret's, Westminster 1735–37 in a 'papery gothick manner' (VCH Middlesex Vol.XIII City of Westminster Part 1 P.144).He was the professional on site for the construction of East India House, Leadenhall Street, London, to designs by the merchant and amateur architect Theodore Jacobsen, 1726–29.