Lancaster Royal Grammar is one of only a few state-funded boarding schools in the country.
It has been officially praised by parents for offering high academic quality, the chance for children to fulfil their potential and good value, according to a new independent survey.
Parents surveyed said their children were happy boarding and they would recommend their child’s school and boarding to others.
Dr Chris Pyle, headmaster of Lancaster Royal Grammar School, said: “These results are a great vote of confidence in the quality boarding we offer at our school.
“We know our boarders are very happy to be here and their parents are pleased with not just with the quality of our results but the huge range of activities we offer.”
The boarding facilities , highly praised by Ofsted , recently underwent a refurbishment and are popular with local youngsters who are able to board all week or as little as one night a week.