If there is one suburb that defines the Darwin louvre problem, it is Leanyer: street after street of 80s and 90s cyclone-code block homes with louvre windows on nearly every elevation, open for airflow eight months of the year. A reed switch has nothing to attach to on a louvre, and panes lift out one at a time in near silence — so an alarm here is designed from the inside out. Motion detection covers the rooms behind every louvre-heavy wall, glass-break detection backs it up where the layout suits, and door contacts are kept for the hinged doors where they genuinely work. Zoning then lets the house stay open to the breeze while it sleeps. Done this way, a louvred Leanyer home is every bit as well protected as a sealed southern one.
The typical Leanyer floor plan puts louvres in bedrooms, living areas and often the kitchen — which means perimeter contacts can only ever protect the doors. Our designs treat internal motion detection as the primary layer: a detector covering each cluster of rooms behind louvred walls, positioned so nobody can move from a window to anything worth taking without crossing a beam. Glass-break detection is added where fixed panes justify it, and every detector is a sealed unit, because a housing that admits geckos generates the classic Darwin 2am false alarm.
Leanyer households live with the louvres open — that is the point of them — so the alarm has to work around an open perimeter rather than pretend it is sealed. We zone the system so the sleeping end of the house and the living end arm independently: at night, motion detection covers the living areas, kitchen and entries while the family sleeps behind them, louvres open throughout. When everyone is out, the whole interior arms. It is a design conversation we have on almost every job in this suburb, and it is solved in the zoning, not by asking anyone to shut the house up at bedtime.
A Leanyer alarm should not stop at the back door, because the block's most stealable contents — tools, fishing gear, the mower — live in the shed. We run the shed as its own zone, so it stays armed day and night while the house zone follows the family's routine. Then there is the annual reality of this suburb: the house left empty for weeks while the family drives south in the dry. Phone monitoring sends every event to wherever you are, and we size the panel's backup battery for real Top End storm outages, so a blackout in week two does not quietly take the system down.
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