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Algae removal - San Lorenzo Court, Cornwall

San Lorenzo Court is a contemporary development of one and two bedroom retirement apartments located in St. Ives overlooking Carbis Bay. The attractive, modern building exterior features a combination of natural grey Cornish slate, local stone and a K Rend render. The render – usually the colour of Cornish clotted cream - had become stained with unsightly black algae. This is a hazard of being near to the sea as the algae thrives in a damp atmosphere and, as is to be expected, the walls to the rear of the building and any recessed areas that do not get much direct sun were particularly affected.

Our tried and tested three-step process gets the best results

Algae can be challenging to remove but we know that our tried and tested three-step process will get the best possible results.

1. First we clean the surface using SteamPLUS; pressurised steam heated to 150 degrees delivers powerful cleaning whilst still being really gentle on the render surface.

2. Next we apply a gentle chemical agent that we have specifically developed to tackle algae staining, this ensures that the final pass with SteamPLUS will completely remove all trace of the algae taking the render back to its original soft cream colour.

3. Finally, since algae is persistent, we apply a growth inhibitor to deter future growth and keep the building exterior looking clean and fresh for as long as possible.

Careful attention to detail ensures successful outcome 

San Lorenzo Court is surrounded by pretty landscaped areas with mature shrubs, flowers and lawns. We have plenty of experience of cleaning residential properties and know how important it is to avoid damaging plants by taking extra care when installing access equipment.

Clear communications with residents

Many of the apartments have spacious balconies with smoked glass panelling so it was important to make sure residents were fully aware of exactly when the cleaning would be taking place, and that they remove any outdoor furniture or other items from their balconies until the cleaning work had been completed. Clear communications with the residents, followed up by careful checking in advance of carrying out the cleaning, helped ensure that nothing was damaged. We also made sure that our team cleaned the glass panels leaving them gleaming.

San Lorenzo Court looks wonderful now that we have completed the cleaning and the residents are delighted with the outcome. The before and after images below show what a difference our cleaning has made.

If you would like to know more about render cleaning or removing algae from your building exterior contact Max or Andy Morris on 0333 234 1445 or email and we will get back to you.


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Some of our clients


Client Testimonials

“Your pressurised hot water system transformed the appearance of our outdoor wooden decking.”

Gary - Lockside Restaurant

“If we need a job to be carried out at short notice they do everything necessary to make it happen, including getting required approvals to allow them to get on site and get the job done.”

Daniel Boyle - MD of Relyon Services

“As always OneFifty got the job done with no fuss. They’re our go-to supplier for exterior building cleaning.”

Mark Sheffield - Contracts Manager - Jones Building Group

“They did a really great job of cleaning the high-level cladding on the building. I know that they offer a range of cleaning services and I will definitely be using them again in the future. ”

Christopher Haswell - Project Manager - Maddox Construction

“The Jet Washing Company (now OneFifty) deliver the best quality exterior surface cleaning, high quality customer service, and excellent value.”

Will Mellor - Knight Frank

“The offending Graffiti was removed without trace using pressurised steam.”

Lucy - Jones Lang LaSalle

Our Accreditations