The Kampung Pandan house that smelt of one musty room. Behind the feather wallpaper, the wall read 999, and it became a Wellness Home.

KAMPUNG PANDAN, Kuala Lumpur. The house was finished and empty. A single-storey bungalow of about 1,500 square feet, bought subsale, renovated, and waiting for the family to move in. The only thing wrong with it, as far as the owner could tell, was one room that smelt musty. He had already had a mould company in once; the work took less than half a day and the smell came back. So on Saturday, 4 July 2026, before a single box was carried through the door, he asked Cleanaholics to look at the whole house properly.

What followed became the most thoroughly documented job in this library: a nineteen-day remediation, a university laboratory, and the home that Cleanaholics now calls a Wellness Home. But it began, as they all do, with an afternoon and four instruments.

Clean air, damp walls

The first finding was reassuring, and it mattered because the house was newly renovated. The air was clean. Formaldehyde read 0.015 to 0.025 milligrams per cubic metre, well within the Malaysian limit; volatile compounds were low; carbon dioxide sat at a comfortable 647 to 769 parts per million. Whatever was wrong with this house, it was not off-gassing from the new build.

The second finding explained the smell. Relative humidity read 62 to 66 per cent in every room, above the line at which mould thrives. And the walls were wet. The moisture meter went to the feature wall in the bedroom and pinned at 999, the top of its scale. The mould-speckled plaster beside it read 999. The second bedroom wall read in the Wet band. The maid's room wall read Wet. At the base of the feature wall, 431; beside the peeled wallpaper, 354; on the feature wall itself, 393.

The thermal camera found no running leak. What it found instead were the affected wall corners running cooler than the walls around them, 28 to 31 degrees against a warmer 35 nearby, and a distinct cool spot beside a ceiling exhaust fan. Moisture held in the wall, the report concluded, rather than a single active source.

Behind the feather wallpaper

The clearest finding in the house was behind the feature wall's feather-pattern wallpaper. The inspector peeled back a corner. On the paper backing, black mould. On the bare plaster behind it, black mould. Along the seam where two drops of paper met, a dense black line. Wallpaper, the report explained, traps a thin layer of moisture against the wall, which is why the advice was to remove it and not re-paper.

It did not stop at the wallpaper. The gypsum cornice, torn open, showed mould through its core. The window reveals showed blistered plaster and water damage at the frames, and the frame heads carried dense black growth along the track. The toilet ceilings showed mould at the exhaust-fan and cornice junctions, the classic high-moisture, low-airflow trap. The three split air-conditioning units were dusty inside, with mould-prone blowers and coils, ready to distribute spores through every room they cooled.

And under the 365-nanometre ultraviolet lamp, the walls the eye read as freshly painted lit up: speckled colonies across the living-room wall, ring-shaped colony outlines on the panelled wall, pale speckling around a downlight, diffuse cloudy fluorescence across whole surfaces, dust streaks heavy on a vent grille. New paint, the lamp showed, had gone on over old growth.

The home is newly completed, yet the interior finishes already carry mould and the walls read measurably damp. Caught now, before move-in, it is straightforward to put right.From the report, 4 July 2026

What happened next

This is the report that turned into the project. The recommendation was a room-by-room remediation of the three bedrooms and their toilets before the family moved in, the maid's and second bedrooms at core level, the master bedroom by a hybrid method, all three air-conditioning units treated, and the interior moisture-proofed, with the living room and kitchen offered as a separate booking. The owner said yes, and something else happened that had not been part of the original plan: Universiti Kebangsaan Malaysia's researchers came to the house and swabbed the walls before the work began.

Nineteen days later the house had been remediated under containment, the ceiling plaster replaced where it needed to be, a plumber brought in to correct the moisture, the surfaces treated and coated, the home cleaned again, and a written progress report sent every single day. The laboratory recovered eighteen fungal isolates from the swabs and named two of them to the species by DNA. Everything about that programme, the eleven stages, the plates, the laboratory tables and the finished rooms, is published in full in the Wellness Home project record.

I don't have to look for three or four different companies, a fungal treatment company, a building contractor, a plumber, a cleaner, to solve the fungal problem at home.The owner’s family, in a public Google review of the completed work

What it means for anyone buying subsale

A renovated subsale house is the one kind of home that arrives looking new and behaving old. Fresh paint over damp plaster, new wallpaper over an old wall, new cornices with a history inside them. The moment between the renovation finishing and the family arriving is the cheapest moment there will ever be to find out what the finishes are covering, because nothing has to be moved, nobody has to move out, and the instruments can read every wall in an afternoon.

Reported from the Cleanaholics inspection of 4 July 2026. The owner's name is withheld and the street is not given. Species were identified by Universiti Kebangsaan Malaysia from laboratory swabs, not from field observation; the full laboratory result is published in the project record.