Kingston residents have slammed "noisy parties" at a Unilever training centre and objected to fresh plans which could see booze sold later into the night at the site. Neighbours said their sleep is already disturbed by noise from Unilever's international training centre, Four Acres, on George Road in Kingston.

Under plans sent to Kingston Council, booze could be sold to residents at Four Acres 24 hours a day, every day, and until 2am for non-residents. The centre is used to train Unilever employees, with 39 bedrooms, and is not open to the public.

Neighbour Mohammad Al Gailani told the council's licensing committee on April 17 he had heard "very loud, noisy behaviour" from the site. He raised concerns about "the noise, especially during the summer, and the loudness of the parties… and the music is terrible, really, when you have to… open the windows to have some fresh air".

Alan Fernandes, bursar at neighbouring Marymount International School, said: "We, internally, have a duty of care to our students… any extension of the licence would increase their exposure to inebriated individuals and/or disorderly behaviour which for a young child can be frightening and upsetting – thereby causing both emotional and physiological distress."

He added: "With the impact of alcohol consumption indoors and outdoors, the noise will affect students' ability to sleep at a reasonable time and perform in their academic studies." He said the school is "aware of monthly parties" which go on late into the evenings.

Local Ross Compton added: "The noise aspect is extremely worrying. The sleep disturbance to young and old people is a great nuisance and I would ask on the basis of that that you refuse the application."

The plans received 13 objections ahead of the meeting. One objector wrote: "We are already suffering, especially during the summer months, from constant disturbance with lack of peace and sleep from the raucous behaviour and noisy parties at Four Acres."

Another added: "We already have our peace and sleep disturbed from time to time thanks to their noisy parties and fireworks."

Solicitor Tim Shield, acting on behalf of the application, said there had not been fireworks at the site for 10 years and no objections had been raised by responsible authorities – including environmental health, police and the children's safeguarding board. He said the centre is not set up for parties and the application does not ask for changes to allow entertainment, which can't be held after 11pm.

Mr Shield said the hours would give flexibility on suitable occasions as Unilever operates in various timezones with meetings at different times. It would allow people to have a "relaxing drink" after meetings, he said, and anyone staying later leaves in taxis so they do not end up "wandering the streets".

Mr Shield added the centre does not have a history of complaints and feels it is "a good neighbour and will continue to be so". He said: "This is a reputable operator. There is no history of disorder. There is no substantiated noise nuisance or history of noise nuisance.

"There are some concerns which the applicant understands and will take on board but this is a positive, a good operator, been there for many years, and is asking for flexibility."

He added: "It is not a site which you can gain general access to. It is very restricted and regulated and if there were issues, and there's no evidence of issues, those could be dealt with on-site." He said use of the site's external area could be restricted if necessary.

Kingston Council's decision on the application will be published in the coming days.