PLANNERS are vowing to take whatever action necessary to get Castle Hill Hotel built to plan.
Their pledge came after Kirklees Council ordered redevelopment to stop because building rules had been broken.
Scores of protests have been made about the height and materials of the new hotel.
The council said it would use every power possible to get a satisfactory outcome.
Head of planning services Keith Faragher said: "We will not tolerate flouting of the approved plans.
"The issuing of a stop notice demonstrates the council's commitment."
The hillside around the hotel was bought by the Huddersfield Corporation in 1920 and inherited by Kirklees in 1974.
Mr Faragher said a stop notice was a last resort, after negotiations and other avenues of getting developers to work to approved plans failed.
He said that when unauthorised developments were discussed with the applicant and the council's intention to serve a stop notice was raised, the applicant's reaction was to speed up building.
Works carried out without consent included digging out cellars across the whole floor area and the building a first-floor conservatory, said Mr Faragher.
He also said the building was higher than approved and developers had demolished parts of the structure that they had agreed to keep.
His comments came after the Thandi Partnership, which runs the hotel, appealed to carry on with the changes.
They admitted two "slight" discrepancies but said the rest of the work was being done according to planning approval.
Mr Faragher said: "As well as being a scheduled monument, Castle Hill is within the Green Belt and is also in an area of special landscape value.
"The council, as local planning authority, has continuously liaised with English Heritage and architectural experts and will continue to do so.
"There is great concern about the damage to the hillside which the developer has created between the hotel and the Jubilee Tower."
Mr Faragher said that at an earlier meeting it was agreed that this would be repaired at the developer's expense and that English Heritage would speed up the necessary approval.
