The Gwaun-tre-Oda Engineering Works were built for De Bergue and Co. in 1861, they were used from the construction of iron bridges. De Bergue and Co. was established by Charles de Bergue, who was born in London to French Parents. The works were located north of Llandaff Yard, near to the Taff Vale Railway line. A gasometer was marked on the 1878 to 1901 OS maps indicative of a gasworks used to light the works. The gasworks built after 1866 and before 1880, when they were recorded as a gasworks built by George Bower, Gas Engineer of St. Neots for De Bergue and Co. Iron Bridge Works Llandaff.