An elderly couple living near the route of a natural gas pipeline through Wales say noise from building work is making their life a misery.
The work is taking place about 10 metres from the Camp's garden
Richard and Wendy Camp's home at Sennybridge near Brecon, Powys, is just metres away from heavy machinery that is operating 12 hours a day.
The Noise Abatement Society (NAS) measured the sound for the couple and said it was equivalent to a chainsaw.
The National Grid said it would erect screening to help reduce the problem.
The NAS measured the sound of the work at between 76 and 80 decibels, which it said was equivalent to heavy traffic or the sound of a chainsaw.
Peter Wakeham, of the NAS, said eight residents in the Sennybridge area of Powys had so far complained about building project.
In February, the Department of Trade and Industry (DTI) gave the go ahead for the second phase of the pipeline, part of which is passing through the Brecon Beacons National Park.
Once finished, the entire network will stretch from Milford Haven to Gloucestershire.
Mr Camp, 70, and his wife Wendy, 76, who live in the national park, said they had been complaining to National Grid since March.
"We have phoned National Grid 10 times and written to them five times. We've received no replies to our letters and just three replies to our phone calls," said Mr Camp.
"It wasn't until we contacted the BBC on Tuesday that National Grid finally decided to take action."
Mr Camp said he understood the work near his home would continue for "some months".
He added: "The heavy machinery and the beeping from reversing lorries is constant throughout the day.
"The machinery is supposed to start at 7am, but sometimes starts earlier. It doesn't finish until 7pm, and by the time its driven away it's 7.15pm.
The Camps said they have complained repeatedly
"The plant is just 10 metres from our rear garden. The constant din is making our life a misery."
A spokeswoman for National Grid said work near Mr Camp's home was at its "noisiest" at the moment.
She blamed it on a process called "benching", which sees machines remove top soil and sub-soil.
"We have been in regular contact with Mr and Mrs Camp. We have spoken to them and are aware of their concerns," added the spokeswoman.
"We have come up with a tailor-made noise mitigation programme for them, which means erecting screening between their property and the working area.
"The benching process is expected to finish shortly."