Where a dark patch hides in Margate
Single-storey slab houses with attic air handlers, so the two places worth reaching are the attic and behind the fitted furniture at exterior wall bases. In a house where the same family has been for thirty years, the second of those matters more than usual: furniture has not moved in a long time, and the surface behind a wardrobe that has stood against an exterior wall since the 1990s is the least ventilated surface in the building.
That is the practical half of this job, because a great deal of what gets photographed and sent to us is not fungal growth at all. Soot deposition from candles, thermal ghosting in dark lines that follow the framing behind the drywall, and dirt staining at an air gap all look convincing and none of them are mold. Send a clear photograph with something in it for scale before you book and a fair number of these conversations end there, at no cost.
Where there is something genuinely growing, a tape lift takes about thirty seconds and the laboratory names the genus. What comes back also says whether the material has actually been colonised or has merely collected spores that arrived from elsewhere, and that distinction is worth more than the name: colonisation means the water is right there, while deposition means keep looking.
Here is the part usually left out. Identification frequently does not change the work. Remediation practice does not vary much by genus, so a result naming one organism and one naming another on the same square metre of wet drywall generally produce the same scope and the same price. Where the fee earns itself is when somebody is disputing that there is growth at all, when the area is large enough that the scope will be argued over, or when the question is whether the staining is fungal in the first place.
The commercial position in Margate is the one published on every page of this site, because the rate card is not a Fort Lauderdale rate card. A flat price by property size, agreed before anyone drives out, with the accredited laboratory fee already inside it. It does not rise if the samples come back positive, nothing is added for the drive, and we take no payment of any kind from anyone who removes mold.

What Margate itself changes
The buildings in Margate
Margate is a town of long-tenure owners in original houses: 77% owner-occupied across 26,356 units at a 1978 median, with 44% single-family detached. That combination produces a distinctive pattern. Where a rental market churns and forces periodic refurbishment, an owner-occupied 1970s house gets maintained rather than renewed, and maintenance concentrates on the things that stop working. Air conditioning stops working, so it gets replaced. Ductwork does not stop working in any way anybody notices, so it is still the original.
Where the water comes from
Ordinary central Broward conditions: no coast, no salt, a flat site and a shallow water table under the whole town. What distinguishes Margate on the water side is roof age rather than anything geographic. A 1978 house is on its second or third roof covering, and each replacement is a moment at which the interface between roof and wall, or roof and vent penetration, was either detailed properly or was not. Those details fail quietly, decades later, into a ceiling assembly.
The cooling systems here
The original duct system is the thing to examine in Margate. Fibrous duct board and flexible duct of the 1970s were made to a specification that assumed a service life shorter than the one they have had, and in a vented attic at Florida temperatures the insulation degrades, the vapour barrier splits and the inner liner absorbs. Where that liner has been wetted, it cannot be cleaned: the moisture is inside the material. That is a replacement rather than a cleaning, and a cleaning quote for it is money spent on the wrong job.