The multi-million pound restoration of Roch Castle was officially revealed to the public yesterday by St Davids born architect and developer Keith Griffiths.
It was also announced that it is Mr Griffiths and his Griffiths Roch Foundation hoping to transform Haverfordwest's former prison and governor's house at the town castle into a luxury boutique hotel, restaurant and gallery.
Council members, including chief executive Bryn Parry-Jones, were among the dignitaries to take a closer look at Roch Castle and the five-star luxury it offers for those with big budgets.
The Retreat Group specialise in high-end luxury coporate escapes for relaxation or business and Roch Castle in just one of Mr Griffiths' Pembrokeshire projects.
The castle's sister property Penrhiw Priory, St Davids, also offers exclusive accommodation costing from £4,000 a week.
The Griffiths Roch Foundation bought the castle in 2008 and more than £6million has been spent on purchasing and restoring it and £3million was spent at Penrhiw Priory.
Work is set to commence on the company's Twr y Felin Hotel, also in St Davids, in May, turning it into a 20 bedroom boutique hotel.
Mr Griffiths said for three years the foundation had been searching for other properties in north west Pembrokeshire and the Griffiths Roch Foundation had been offered a lease upon the prison, governor's house and grounds of Haverfordwest castle subject to planing and listed building consent.
It is thought that around £3million will be invested and it will provide work for 25 local people during a three year construction period.
"I am excited about the prospects for Haverfordwest castle and believe that a high quality hotel there will contribute significantly to the regeneration of Haverfordwest town centre and complement the restoration works already underway in Market Street and High Street.
"I hope through the care of the Griffiths Roch Foundation I am able to offer Haverfordwest a suitable solution to this magnificent building. I am looking forward to engaging and consulting the citizens of Haverfordwest through the County Council, Civic Society and other bodies to ensure that our work provides the best solution for these buildings' longevity and that their restoration and operation brings true and desired benefit to the citizens of Haverfordwest."