The fence fiasco means a two-mile diversion for drivers to get down what should be one straight road in Dawlish.
Developers on each side of the dividing line are adamant they followed plans.
Planning authority Teignbridge District Council and roads authority Devon County Council are getting together in the New Year to try and sort it out.
More on the fence mix-up and other stories from Devon and Cornwall
A number of different developers have built on the estate with their own individual planning permissions.
Carhaix Way is meant to join two neighbouring developments but there is about 1ft difference in the height between them.
Carhaix Way resident Kaylea Ibbeson said one delivery driver left a note on the fence rather than drive all the way round to her house.
"He said he was unable to deliver the item," she said.
Strongvox and Cavanna, the two developers either side of the Carhaix Way divide, insisted they carried out the developments according to the planning permissions "to the letter".
Teignbridge, which controls the strip of land between the two developments, said in a statement that development around Carhaix Way was "carried out under separate planning permissions by separate developers".
It said each permission "required the road to be taken to the boundary with the overall intention to provide a footpath and road link between the two".
Agreements with Devon County Council show "a continuous road" and the district council said it was "working with the county council to achieve completion of the highway".
A housing estate has been split in two by a fence because of a 1ft height difference in a road between two halves of the development.