Kay Marshall, 65, and her husband, John, 70, have owned their 1750s home on the corner of Broad Lane and Long Lane for more than 10 years.
But she said coaches and larger vehicles are continually hitting the property’s wall and she is worried the authorities are not helping her to protect her historic home.
She said in the last year she needed to repair the wall three times. Her insurance excess is around £1,000.
Devon Country Council highways carried out a survey nine years ago and put up advisory signs indicating the road was not suitable for traffic over 25 metres in length.
But they took the sign down two years ago.
Since then the number of collisions has increased as large vehicle drivers use the route as a shortcut.
She said: “Coaches come so close around the corner that we can’t even open our windows – it has become a nightmare.
“If more and more houses are put in Appledore, as planned, the traffic here will increase and it will only be a matter of time before there is a bad accident.
“It is a fantastic house if I can keep it standing up.”
The garden wall running around the Broad Lane side of the home is attached to an historic shepherd’s hut.
Although Mrs Marshall said the shepherd’s hut, which is one of the few left in England, was of historic interest, and her home was listed because its windows are all different size and shapes.
Mrs Marshall, who is retired and does charity work for the North Devon Animal Ambulance, has started an Open University course in heritage site conservation to learn more about looking after her property.
She said: “The council is under an obligation to protect heritage sites, but getting it to do something is difficult.
“The council suggested we pay for a pavement to be put around the wall, costing £6,000, and it will then adopt it. But, we’re pensioners and we’ve not got that sort of money.”
A Devon County Council spokesman said: “Although the council is not responsible for protecting properties adjacent to the highway from the actions of third parties, we have been endeavouring to work with the owners of the property to minimise damage from traffic.
“We have provided reflective bollards to the front of the building and we are examining whether a kerb line in the highway may help to keep traffic away from the property.”