The Gresham Hotel

External cleaning of the Gresham hotel

Client : Hotel Riu Plaza The Gresham

Decades of grime and pollution were swiftly removed from the front and side elevation of the iconic Gresham Hotel in partnership with Thomann Hanry using their patented façade Gommage technique. The entire project was completed in under 2 weeks without the need to erect scaffold, causing minimal disruption to the Hotel, Hotel Guests and the general public. 

Cleaning side elevation of Gresham Hotel

An example of great teamwork

The partnership between P Mac and Thomann-Hanry® was an extremely streamlined and successful process. The Pmac team ensured the facade was prepped before the machinery arrived. All electrical and loose wires and cables were removed in the previous week. Full planning permission had to be sought from Dublin City Council, as we were carrying out works on a listed structure. Our long experience working in the public realm ensured we had the knowledge, expertise and safety credentials to manage a construction site on an extremely busy and heavily pedestrianized street.

Stone cleaning of historic building

The O’Connell Street facade was cleaned in five days, after which the machine was moved around the corner to Cathal Brugha Street. The challenge here was traffic management. This street had fewer pedestrians, but we had to park the machinery on the road and disrupt a taxi rank for four days.

We believe the results speak for themselves! The compliments received and attention this project received in the media were phenomenal. There is a real feeling of gratitude towards the Riu Gresham Hotel from Dubliners happy to see this iconic building regain its former glory and there is a hope this is the start of a major and much-needed rejuvenation of O’Connell Street.

Heritage Contractors

PMAC projects are very varied. Our legacy is quality projects we can be proud of and the below projects are an example of them. We value the inputs of our customers, our team and our supply chain in reaching positive outcomes. Health and safety to our people and the public is a priority for us and without compromise.

If you are working on a similar project we would love to hear about it. Dont hesitate to call us or send in the details of your project through our contact page at

PMAC is a registered Heritage Contractor and a link for the site can be found below.

The majority of PMAC projects are based in Dublin but we also work all over Ireland. Our wide range of services are available to both residential and commercial clients.