The award-winning way to protect the past

Historic buildings cleaning and historic buildings restoration

The façade gommage® system has received accreditations and accolades from numerous organisations all over the world, including approvals from Historic England and endorsement from UNESCO for work in cleaning and restoration of historic buildings on the World Heritage List.

  • Historic England consent to clean Scheduled Ancient Monuments.
  • Listed Building Consent to clean historic buildings and for historic buildings restoration.
  • UNESCO approvals to work on World Heritage Sites.
  • Awarded the “Prestige de L’Europe and Laurier d’Or” in France for “Technical Achievement in Restoration”.
  • Approval granted by the “National Park Service” in the USA and the “Heritage Conservation Program” – Canada.
  • Listed in the “Guide of French Artisans d’Excellence” for the cleaning of historic structures.
  • Granted the “Qualité Ravalement de Paris” in France for working on landmark buildings.
  • Test panels on the “Place Vendôme”, “Château de Versailles”, and the “Louvre Museum” in France were analysed and approved by the Laboratoire Nationale des Monuments.


Considerate Constructors 2017 Awards

In 2017, Thomann-Hanry® won two awards within the Considerate Constructors Scheme – National Company Gold Award and Runner-Up.

Companies that performed to the highest levels set out by the Code of Considerate Practice receive a Bronze, Silver or Gold Award, presented by an influential line-up of industry leading figures. Runner-up awards are given to those that have been considered for the ‘Most Considerate’ title.

Read more here.

Our industry accreditations

Thomann-Hanry® have a reputation for technical innovation and excellence. Our knowledge is well built not only on the skills of our people, but also on the highest industry standards. Our practices, processes and competencies meet all the key industry accreditations, ensuring that our clients receive the highest quality of service for their business requirements.

Click on the logos to see the each relevant certificate


historic buildings restoration, Considerate Constructors
historic buildings restoration, Considerate Constructors Gold Award
historic buildings restoration, Considerate Constructors Runner-up

historic buildings restoration, ISO 9001 Certified Company
historic buildings restoration, ISO 14001 Certified Company
historic buildings restoration, Safe Contractor Approved Company

historic buildings restoration, Constructiononline Certified Company
historic buildings restoration, CHAS Accredited Company 

historic buildings restoration, BBA Certified Company 
  historic buildings restoration, CITB Accredited Company   
 historic buildings restoration, RIBA Approved CPD seminars


     historic buildings restoration, London Chamber of Commerce and Industry Member 
   historic buildings restoration, Member of the British and Irish Trading Alliance   
    historic buildings restoration, CPA Accredited Company

See our projects