Every project on this page started the same way: with a survey. Before we price anything, an engineer inspects the system, often with a ductwork camera survey that records the internal condition of the ductwork itself. That is how the Calford Seaden work began, with a 25-metre fisheye camera threaded through the vertical shafts of high-rise residential blocks in Kensington and Chelsea.
The survey becomes a written scope: what will be cleaned, repaired or replaced, the standard it will be measured against, and how we will get there. Then we deliver around your live operations. At Castle Hill Hospital in Hull we surveyed, cleaned, sealed and rebalanced failed ductwork within a working hospital estate. At the National Physical Laboratory we cleaned the full supply and extraction ventilation system and every air handling unit to BESA TR19 and HTM03 inside a two-week turnaround, with independent testing waiting at the end and no margin for a second attempt.
Every job closes with an evidence pack at handover: written and photographic reports, video where the survey called for it, test results and the certification your insurer, auditor or fire risk assessor will ask to see. The reports do more than record what we found: they set out how the system should be maintained from here, so you can make the right decisions about your building. If the work cannot be proved, we do not consider it finished.
The three projects above are told in full. Others are in progress across commercial, healthcare and science estates, and named case studies publish here as clients sign them off. If your building has a similar problem, the survey is where we would start.
