Below are list a few of our clients in Great Britain. We have many more around the world; our quality has meant that collectors have prefered to send work here than have it done locally, often with not much difference in overall cost, including transport. (See Shipping for more details.)

• British Art Gallery, London
• The late Alan Clarke M.P., Saltwood Castle, Kent
• Christopher Wood Gallery, London
• The Duke of Marlborough - the collection at Blenheim Palace.
• Earl of Seafield, Scotland
• European Art Gallery, Dallas
• Garfield Weston, U.S.A. - Collection of 40 paintings on view at Fortnum & Mason, Piccadilly.
• Leeds Castle, Kent
• London Army & Navy Club, St.James's, London
• London British Library
• London East India Club, St. James's, London
• London Foreign Office
• London Lord Chelsea - including a recently discovered masterpiece by Nicolas Poussin which is to go on loan exhibition at The National Gallery.
• London Oxford & Cambridge Club, London
• Royal College of Surgeons
• Royal Society of Medicine, London

Over the last 130 years, Hahn has restored many of the paintings of the great masters of art. More recently, Hahn has restored and conserved fine works by artists such as:

• Canaletto
• John Constable
• Thomas Gainsborough
• John William Godward
• Sir John Everett Millais
• Claude Monet
• Sir Alfred Munnings
• Nicolas Poussin
• Pierre-Auguste Renoir
• Sir Joshua Reynolds
• Sir Peter Paul Rubens
• George Stubbs