Salt spray: what living near the water actually does to your house
Airborne salt lands on everything within a few streets of the water. It hazes glass, chalks paint and frames, tea-stains stainless and drives decay into sandstone. The remedy is dull and effective: fresh-water rinsing on a schedule, two to three times a year near the coast, concentrating on the surfaces rain never reaches. BlueScope's TB-4 requires exactly that for coated steel in marine environments.
Salt travels further inland than the view does
Breaking waves throw salt into the air as a fine aerosol. An onshore nor'easter carries it inland, and it settles on whatever it meets — glass, paint, steel, stone. It does not stop at the houses with the view. In Manly, along Middle Harbour and through the beachfront streets of the Eastern Suburbs, homes several blocks back still take a real salt load. Smaller than the place on the point, but the same weather. You don't need a water view to get the water's problems.
You see it in four places. Glass goes hazy, a grey bloom that shows itself in low afternoon light. Painted window frames and sills chalk, the surface going powdery and flat under your hand. Stainless fittings tea-stain, rust-brown weeping from balustrade fixings, door hardware and letterboxes. And sandstone suffers worst. The Heritage Council of NSW's salt-attack guide documents how soluble salts decay sandstone and masonry from the inside, crystallising in the pores as the stone dries and lifting the surface grain by grain.
The surfaces rain never reaches go first
Rain is an unreliable but real rinse. Where it lands hard it dilutes the salt and carries some of it off. Which means the surfaces that stay dry are the ones quietly accumulating. Under the eaves. The soffit line and the top of the wall beneath it. The sheltered side of the house that the weather never quite hits. Garage doors under a deep overhang. The undersides of balustrades and window heads. Salt arrives there the same as everywhere else, and then never leaves.
It reads backwards the first time you notice it. The protected corner of the house looks worse than the exposed one, and the wall you never think about is the one chalking. Walk the place after a dry week and find the line where rain stops reaching — on render, on Colorbond, on the garage door. Below it, generally fine. Above and behind it, a dull film you can drag a finger through. That line is your maintenance map, and it is where a rinse earns its keep.
BlueScope already wrote the schedule down
You don't have to take our word on the cadence. BlueScope's Technical Bulletin TB-4, the maintenance document for its own exterior coated steel products, requires regular fresh-water washing, and more frequent washing in marine environments. That covers a good share of a Sydney house: the Colorbond roof, gutters and fascia, the garage door, steel fencing, carport framing. The manufacturer's own position is that washing near the coast is not cosmetic. It is part of how the coating is meant to be looked after.
TB-4 is equally clear about method, warning against harsh treatment — abrasives and aggressive chemicals take the coating off with the salt. The heritage guidance arrives at the same place from the other direction: don't blast affected sandstone, and don't seal it, because a sealer traps salt and moisture inside the stone where the damage happens. Two documents, one conclusion. Wash gently, wash often, and be suspicious of anything that promises to fix salt in a single aggressive pass.
What rinsing fixes, and what it never will
Here is what fresh water genuinely does: it removes the salt load before the salt does chemistry. Haze off glass. Film off frames and doors. The deposit off sheltered steel that would otherwise sit there through a humid summer, drawing moisture out of the air and staying wet. Done on a schedule, it holds surfaces roughly where they are, which near the water is the entire game. Nothing about it is clever. Its whole value is that it happens regularly.
What it cannot do is undo what has already happened. Glass that has carried heavy salt for years can be permanently etched, and a clean reveals that rather than removes it. Chalked paint is oxidised paint — washing takes the powder off, not the years. Stainless that has pitted stays pitted, even once the brown weeping is gone. Fretting sandstone is a conservation job, not a cleaning one. We would rather say all that at the quote than after the work.
The cadence for a house near the water
Cadence follows distance from salt water. On the foreshore — Manly, the Middle Harbour points, the beachfront streets of the east — three window cleans a year plus a rinse of the sheltered steel each quarter is sensible. A few streets back, twice a year holds it. Two ridgelines inland, annual is fine. The efficient version is one visit that does the lot: windows, walls, roof and the shaded surfaces together, since bundling services on the same visit saves 5-15%.
Prices are plain. Window cleaning starts at $150, with most single-storey homes landing between $150 and $550 by window count, and two storeys adding about 40%. A house soft wash starts at $300, most single-storey washes running $420 to $960 by wall area. Roof and sandstone work is quoted per job. If you want your actual number instead of a range, the instant quote returns a firm, bookable price in about 60 seconds, and it holds unless the place is materially different.