A Unilever training centre has won a battle to sell booze later into the night in Kingston, but faces extra restrictions, after neighbours' complaints about "noisy parties" on the site. Residents previously claimed they are already disturbed by noise from the international training centre, Four Acres, on George Road in Kingston.

Kingston Council's licensing committee decided to grant the application in part – meaning booze can be sold to residents at the training centre 24 hours a day, seven days a week, and until 2am for non-residents. But it has imposed new conditions which mean food and drink, including booze, can't be consumed in any of the centre's external areas after midnight every day.

A further condition requires the licence holder to make sure no noise comes from the site which causes a nuisance.

It comes after Alan Fernandes, bursar at neighbouring Marymount International School, told the council's licensing committee on April 17 the school was "aware of monthly parties" which go on late into the evenings.

Mr Fernandes 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."

Neighbour Mohammad Al Gailani said he had heard "very loud, noisy behaviour" from the site. He raised fears 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".

The plans also 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."

Solicitor Tim Shield, acting on behalf of the application, said responsible authorities had not raised any objections – 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 on the site.

Mr Shield said the hours would give flexibility on appropriate 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.

The committee made its decision after the meeting, which has now been published on the council's website and adds: "If antisocial behaviour occurs, residents can contact the licensing authority with videos or photographs or evidence so that an investigation can take place and the officers can also seek to review the premises licence."