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 the approval by Historic England and endorsement from UNESCO for work in cleaning and restoration of historic buildings on the World Heritage List.

Some of our distinctive accolades:

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

Most Considerate Company 2018 and Runner-up 2019

Founded in 1997, the Considerate Constructors Scheme recognises companies that demonstrate exceptional levels of consideration towards their community, environment and workforce.

Previous recipients of a Bronze Award in 2015 and a Gold Award and Runner-up in 2017, Thomann-Hanry® have gone one better at the 2018 awards, winning the ‘Most Considerate Company’ accolade for all companies in the turnover range of £3.5m-£10m. 2019 saw us winning another Gold Award and Runner-up for ‘Most Considerate Company’ again.

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 each relevant certificate


historic buildings restoration, Considerate Constructors
  Considerate Constructors Runner up award 2019
   Most Considerate Company 2018
    CCS Runner up 2017

Considerate Constructors Gold Award 2019             
CCS Gold Award 2017
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
London Construction Awards, Product Innovation of the Year
London Construction Awards, Technological Innovation of the Year
CMA-2019-Finalist-Marketing Team of-the-Year


See our projects