Russell W O'Brien Jr.
ActiveMiami, FL 33165
MRSA4148 · licensed since 2022
Licensed Mold Assessor · Miami, FL
| License number | MRSA4241 |
| License type | MRSA — Licensed Mold Assessor |
| License holder | Winston Dario Castaneda |
| Location | 19605 Sw 134 Ave, Miami, FL 33177 |
| Licensed since | 2022 |
| License expires | 07/31/2028 |
| Status in DBPR records | Current, Active (as of 2026-08-11) |
Winston Dario Castaneda holds Florida licence MRSA4241, a MRSA classification which authorises work as a licensed mold assessor. An "R" prefix means the licence is registered, which limits work to the local jurisdictions that accepted it rather than the whole state.
This licence was first issued in 2022, which makes it a relatively recent licence for the trade in this area. Roughly 61% of the 398 active mold inspection licences based in the Miami area were issued earlier than this one, and the local median sits at 2020. That is 4 years of continuous licensure.
Winston Dario Castaneda is one of 240 active mold inspection licences registered to an address in Miami, so you have local alternatives to compare quotes against. Winston Dario Castaneda additionally holds 1 other active Florida licence in our records, which can indicate a contractor qualified across more than one trade or entity.
The licence is recorded as expiring on 07/31/2028. Florida licences renew on a fixed cycle, and a licence that is not renewed moves to delinquent status — which is why the expiry date matters if you are planning work close to that date. Confirm the current status on the state portal before signing a contract.
This page is generated from Florida DBPR public license records and is shown for consumer-protection purposes. Winston Dario Castaneda has not claimed this page, is not a sponsor, and no endorsement is implied. Figures comparing this licence to others are calculated from the same public dataset, last refreshed 2026-08-11. Always re-verify license status and insurance directly before hiring.
Miami, FL 33165
MRSA4148 · licensed since 2022
Miami, FL 33196
MRSA4431 · licensed since 2022
Miami, FL 33165
MRSA4143 · licensed since 2022
Miami, FL 33018
MRSA4861 · licensed since 2023
Miami, FL 33175
MRSA4446 · licensed since 2022
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See all mold assessors & inspectors in Miami →
Winston Dario Castaneda is #275 of 398 mold assessors & inspectors in Miami by length of licensure — that places this record on page 5 of the Miami list.
Florida records these licences under the same qualifying agent name. A single qualifying agent can hold licences across several trades or entities, so this is a name match in the public register — not proof that the same person or business is behind each one.
Miami, FL 33177
MRSR4469 · licensed since 2022