Laurence Llewelyn-Bowen wants to convert an outbuilding at his family home near Cirencester into an annex to help house his growing family.

A planning application for the work at Roberts House in Siddington has been submitted to Cotswold District Council on behalf of the Changing Rooms star.

The planning statement, prepared by Plan-A Planning and Development, says: "It is intended that the annex will be occupied by members of the applicants’ family.

"In the first instance it is one of the applicants’ children, their partner and child who will occupy the annex. Mr & Mrs Llewellyn-Bowen’s son-in-law works (on-site) for the family’s design company and as part of their day to day living arrangements the extended family regularly share meals in the main house.

"The applicants’ daughter and her spouse will also continue to make use of ancillary domestic facilities available at the main house.

"They are also dependant on the applicants for childcare support.

"Depending on future need, it may be that the proposed annex is used by Mrs Llewelyn-Bowen’s elderly mother, whose health is such that she is likely to require additional care and support in the near future.

"If in due course the annex is no longer required by family members, it is anticipated that the

accommodation could be used as staff quarters, which would be befitting of a property of this size and stature.

The accommodation will comprise two bedrooms, a study/studio and bathroom on the upper floor, with a kitchen and other ancillary living accommodation on the ground floor, linked by an internal staircase.

Permission to erect the outbuilding was granted in January 2010.

The planning statement says: "It appears the outbuilding was not constructed entirely in accordance with the details shown.

"Furthermore, subsequent alterations have taken place. Whilst none of the changes benefit from express planning permission, all the works took place well in excess of four years ago.

"As such, the relevant ‘operational development’ benefits from immunity from potential enforcement action.

"Furthermore, use of the building itself has remained as ancillary accommodation to Roberts House and therefore no material change of use or breach of condition has occurred."

Built in the sixteenth century, Roberts House is a Grade II listed building but the planning agents state the proposals 'will not impact negatively on the setting of Roberts House nor diminish its significance as a designated heritage asset'.

The six-bedroom house was put on the market for £1,750,000 in 2014. The Cotswold stone walled garden has been widely featured in magazines and on television including Gardeners’ World and in the BBC coverage of the Chelsea Flower Show.