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Our Process

We follow tried, tested and proven processes which guarantee the best possible cleaning outcome. Whatever the surface material and whichever the contaminant, we know how to achieve superior cleaning results whilst at the same time mitigating risk of damage.

Taking the Brief

We will discuss your requirements in full to make sure that we thoroughly understand your requirements prior to undertaking the work.

By understanding exactly what you are looking to achieve, as well having some idea of your planned budget, allows us to recommend the most appropriate and cost efficient approach and deliver the best possible outcome.  

We will also ask about any special requirements such as access requirements, preference to what time of day you might prefer cleaning to be carried out.  

Providing an estimate

Once we know what is required we will provide you with a written estimate for the required cleaning work.

This will take into account any special requirements such as hire of access equipment or any additional cleaning products that might be required.

Site visit/test clean

If our estimate is acceptable we will then arrange for a site visit to thoroughly assess the areas to be cleaned prior to undertaking the work. 

We can run a test clean on a discreet area of the stone to demonstrate our process and identify any vulnerable, damaged or worn areas which might need specific treatment. In this way we ensure that our treatment meets the most stringent of conservation guidelines and delivers the best possible outcome.  

Four levels of service

Very urgent icon

Very urgent

12 hours

OneFifty offers an emergency call out service for anyone requiring an urgent rapid-response cleaning service with cleaning carried out within 12 hours of booking.    


Urgent icon


48 hours

When work needs to be carried out very quickly -  such as removing unwanted Graffiti - we can guarantee that this  will be done within 48 hours of booking. 


Reactive icon


30 day

We understand that it is not always possible to plan exterior cleaning projects far in advance. We always do our best to schedule required work  within 30 days of booking.  


Planned icon


+31 days

Booking exterior cleaning work far in advance allows us to plan projects, schedule work for our operators and make the best use of our resources. We reward this by offering a discount of 10%. 


Some of our clients


Client Testimonials

“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 work was carried out to a very high standard and we would not hesitate to use you again.”

Cathering Stott - Eunomia Research & Consulting

“Excellent to deal with from start to finish, very professional in their attitude and kept us informed at every stage. ”

Esther Hunting - Warwick Estates

“It is refreshing to work with such a dynamic, enthusiastic and reliable team.”

Adam Coombs - Regional Director, Hillcrest

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

Gary - Lockside Restaurant

“I just wanted to let you know that we are on site today and think that the building is looking so much better, so thank you very much for that.”

Anita Pitts - Hartwell House

Our Accreditations