Finally in 1810, work started under the direction of John Thomas. Surprisingly, the decision was taken to start in the middle, with a section of the main line and the branch to Tiverton. The logic for this was that there was a large potential trade in limestone between quarries at Canonsleigh and Tiverton, and this would generate income. The summit level was cut lower than the original plans, so that no locks would be required, but this greatly increased the amount of earthworks required. A further Act was obtained in 1811 to sanction this, and to re-route the canal near Halberton, where Rock Bridge was constructed to carry the road over the canal. The same engineers that built the canal also built a substantial country house, turnpike house and cottages at the site. Several other bridges, including Batten's Bridge, Crownhills Bridge, Greenway Bridge and Sellick Bridge were also constructed at Halberton to carry minor roads over the canal.