Case Studies

Case Studies

Three new case studies every month, each from a different service. Every job here has its reports issued or certificates lodged. Town or area only; clients and addresses are left out. For a shorter list of everything we have done this year, see our recent projects.

Last updated: 25 October 2026.

Part O overheating: three terraced houses, Slough

The project. Three new-build terraced houses in Slough. The client needed Part O overheating reports for building control, at the lowest cost that would do the job.

The challenge. Part O gives you two routes: the simplified method or a full dynamic model. The dynamic model costs more and takes longer, so the client wanted to know which one this scheme actually needed. Later, building control asked for the Part 3 declarations as well: noise, security and protection from falling.

What we did. We checked the drawings first and gave a straight answer: the simplified method should work here, and if it didn't, the next step would be a dynamic model. We then ran the simplified method on all three houses, covering both the overheating limits and the Part 3 requirements in the same report. When building control asked for the Part 3 declarations, the answer was already in the report, so the client only had to forward it.

The result. All three houses passed the Part O simplified method. No dynamic model was needed. Reports were issued the next working day after we received the plans.

Air and sound testing: five flats above a commercial unit, Southampton

The project. A conversion to five flats above a commercial unit in Southampton city centre. The client needed pre-completion air tightness tests on every flat and Part E sound tests for building control.

The challenge. Sound testing a conversion over a commercial unit means testing the floors between the commercial space and the flats, as well as the walls between flats. Those separating floors are often where conversions struggle. The air tests were added to the booking a few days before the test date, so both had to be done together on the same day.

What we did. We agreed the test plan with the designer before the day: airborne tests on two separating floors between the commercial unit and the flats, and on two separating walls between flats. We added the air tests to the same booking, so the client paid for one trip, not two. Our air testers are registered with the Elmhurst Airtightness Scheme and our sound testers with SITMA. As a conversion, the flats were tested against a design air permeability of 8 m³/(h·m²).

The result. All five air tests passed first time, at 3.15 to 7.77 m³/(h·m²) against 8. All four airborne sound tests passed, at 45 to 56 dB against 43 dB, including the two between the commercial unit and the flats. Reports went to the client two working days after the tests.

TM44 air conditioning inspection: document storage warehouse, Park Royal

The project. A 1,195 m² document storage warehouse in Park Royal, north-west London. The building owner needed a TM44 air conditioning inspection and a lodged report to stay compliant.

The challenge. This was a Level 4 inspection, not a simple one. The building has three separate air conditioning systems: split units, a multi-split system and close control units in the storage vaults, 127 kW of rated output in total. Close control units hold the temperature and humidity steady for the stored documents, so they have to be inspected as their own system. The floor plans and F-gas records came through late, on the day the inspection was booked.

What we did. We provide simple and complex (Level 3 and Level 4) TM44 inspections across the whole UK, including Northern Ireland. We kept the booking and our assessors inspected all three systems as planned. The report covers each system: how it is sized for the space it serves, its controls and how efficiently it runs, with practical recommendations for the owner and their maintenance contractor.

The result. TM44 inspection report lodged on the government register on 22 October 2026, covering all three systems and 127 kW of rated output. Booking a TM44, commercial EPC and DEC together costs less, because we save on travel.

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