At one point, the Clooneys had 1000 mature trees transported to the estate by lorries and planted around the outskirts of the property to protect their privacy.
A source said: "It is a known fact in the village that the Clooneys' closest neighbours were very stressed by the building work. At the height of the work, there were up to three large building lorries in the small road leading to the Clooneys' house every day.
"But the Clooneys have given a lot back to the community since they moved in. They have been incredibly generous in compensating the Groves for the hassle of the building work."
During the height of the work in September 2015, the Clooneys paid for the Groves to take a week-long break on the Greek island of Corfu.
Upon their return, they moved into The French Horn, a hotel and restaurant 300 yards from their home at the expense of the Clooneys for six weeks.
Perched on the banks of the Thames, the 19th century former coaching inn is the Clooneys' favourite local dining spot and charges couples £225 a night to stay at its riverside cottage suites.
The restaurant, which sells vintage wines for up to £25,000 a bottle, is also a favourite of UK Prime Minister Theresa May, who is often seen dining with her security team in tow. The Clooneys are such fans of the restaurant they regularly hire its staff for private dinner parties at their mansion.
After staying in the hotel became inconvenient for the Groves, the Clooneys secured them a £780,000 cottage in the village for a year, with all rent and bills paid by the Hollywood actor and his human rights lawyer wife. It is not known how much this cost overall.
Finally, the Clooneys agreed to make a one-off payment of around £30,000 to the couple. Since the work was completed last year, the Groves have moved from their former home - a £500,000 cottage at the foot of the celebrity couple's driveway.
Neither the Clooneys nor the Groves wished to comment on their dealings with one another.
Clooney bought his estate for £7.5million in 2014 after marrying his wife, who is now pregnant with twins, in an extravagant four-day wedding in Venice.
The couple submitted plans for a £12.5million refurbishment of the property in March 2015, which were approved by South Oxfordshire District Council in May that year. For months, villagers endured a cacophony of building work.
For a time the skyline was dominated by a 200ft crane, and the streets were filled with a constant stream of HGVs and vans going to and from the property.
Speaking about married life last year, Clooney said: "I'm very happy. We are having a really fun time.
"We are remodelling our house, which is hell. We've got married and remodelled the house. We are having fun."
The Clooneys officially moved into the property, now thought to be worth £23.5million, last year and held a private dinner for a select group of residents in the village, which is also home to Led Zeppelin guitarist Jimmy Page and 'spoon bender' Uri Geller.
As well as The French Horn, Clooney is a regular at local pub The Bull Inn, which stocks his own brand of sipping tequila. He was recently spotted there with fellow Hollywood A-lister Bill Murray and the pair were said to have left a $100 note as a tip.
Last month, Clooney made a surprise visit to an 87-year-old fan who wrote to him from a local care home.
