A conservation group has urged Enfield Council to reveal more information about plans for a museum and archive that contain a wealth of historical artefacts.

The Enfield Society has been pressing the council to reveal plans for the Museum of Enfield and the Local Studies Library and Archive, which are based at the Dugdale Centre in Thomas Hardy House, Enfield Town, but says it has so far received no response.

In March, the local authority agreed to create offices for its children’s services department on the first and second floor of the Dugdale Centre. Staff are due to move into the building from September.

The council says the museum – currently occupying the ground floor and first floors – will stay at the Dugdale Centre, with the permanent displays moved to the ground floor.

But senior members of the Enfield Society say they are “extremely concerned” about the fate of the museum and archive – warning the changes could threaten their accreditation by the Arts Council and National Archives and deprive them of eligibility for grant funding.

They also warn the shake-up could be at odds with the borough’s heritage strategy, which was approved last year and is designed to boost engagement with history.

In a letter to council leader Cllr Nesil Caliskan on June 26, they wrote: “The remaining rooms on the ground floor of the Dugdale Centre are wholly inadequate for a display of the museum’s permanent collection.

“Failure to provide adequate accommodation could result in a fragmented service across the borough.”

The Museum of Enfield contains around 17,000 artefacts from across the borough dating all the way back to prehistoric times, but only a small number are on display at any one time.

The Local Studies Library and Archive features historical documents dating back to the 13th century, including photographs, newspapers and journals. Previously based at Palmers Green Library, it moved to the current building, which was specially adapted to host it, in 2008.

Val Munday, lead on the museum and archive for the Enfield Society, said: “I don’t know where the council are going to fit the permanent collections. There is a theatre and café on the ground floor of the Dugdale Centre, and not really room for display space.

“If you have a school going to visit, it is not really satisfactory – accommodating them on the ground floor is going to be extremely difficult.

“Local studies are going to move, but we are not sure where to. It was only a few years ago when local studies moved from Palmers Green. The floor of Thomas Hardy House is specially reinforced, and the temperature is controlled, so it is going to be a major upheaval for local studies to move.

“People like it in the centre of town because it is accessible. Visitor figures for both the museum and archive have gone up since the move to Thomas Hardy House.”

The Enfield Society says the council should hold a full consultation with stakeholders before any decision is made on relocation.

An Enfield Council spokesperson said: “The museum will remain at Thomas Hardy House with permanent displays relocated to the ground floor. We are working on a detailed design and will share proposals in due course.

“Options for the location of the archive are currently being reviewed. Accessibility will be a key consideration. We will again share proposals in due course.”