"They don't really seem to care," she said.
Mr Lamb, who chops and delivers wood as a hobby, said the parked vehicles became a problem for him when he needed to back his truck, and sometimes wood-splitter, in and out of the driveway.
Sometimes when their driveway has been blocked, the couple have had to park their vehicles down the street.
"On any given day, we have seven [Auto Imports and Wholesale] cars parked outside our house -- weekends as well," Ms Miller said.
"I have had to go to the council to get white lines put outside my driveway. And about three or four other houses have done the same, so [the dealership] can't park over our driveways or so close to our driveways that we can't get into them."
She said it had taken calling the Masterton District Council "once a week" for a stretch of time before any action was taken.
Since the lines were applied a couple of months ago, the car dealership had been parking their vehicles within the lines but "on an angle in the weekends when there are no parking wardens out".
The couple said this way the company could fit more cars into the spaces, but as a result the parked vehicles obstructed the view of oncoming traffic for residents pulling out of their driveways.
There have also been occasions when the couple has witnessed the company's vehicles parked in their driveway.
"Not across -- but in," Ms Miller said.
She said this had probably occurred after people had taken a vehicle for a test drive and had been unable to find a suitable park to return it to, due to the company's overflow of cars.
The couple said they had not had the same issues with Central Vehicle Brokers, another car dealership across the road from their house, who were "really obliging" as opposed to Auto Imports and Wholesale, who were "so blase".
A business owner on Queen St said the imported vehicles often took up all the parking spaces on the western side of Queen St from UCOL to The Warehouse between 8am and about 5.30pm.
Many of the vehicles parked along the road are unwarranted and without number plates.
Masterton District Council spokesman Sam Rossiter Stead said the council did not have the authority to issue tickets for unlicensed and unregistered vehicles, which is the responsibility of the police.
Masterton police said they were aware of the issue. They would not say whether tickets had been issued to the company.
Auto Imports and Wholesale director Lawson Hoggard declined to comment.