Merc.Build builds one-of-a-kind luxury homes on Sydney's Northern Beaches — from Manly to Palm Beach — under Builders Licence 377744C. Our work here centres on coastal custom homes and knockdown rebuilds detailed for salt, sun and southerly weather.
Beaches architecture at its best is relaxed on the surface and rigorous underneath — houses that throw open to the north-east in summer and shrug off a black nor'easter in June. Getting both takes a builder who details for the coast by habit.
Designed for the beach, detailed for the weather
Every material within a kilometre of the surf is on the clock. We specify for exposure zone by default: 316 stainless fixings, marine-grade aluminium or thermally modified timber cladding, glazing engineered for wind region and salt spray. The architecture stays light — deep verandahs, breezeways, framed ocean views — because the durability is handled underneath it, not instead of it.
Bushfire, flood and coastal controls
Large parts of the Beaches carry BAL bushfire ratings, coastal hazard lines or flood controls, each of which shapes what can be built and from what. We fold those constraints into the design from the first sketch and manage the specialist reports through approval, so compliance is invisible in the finished home.
From weekender to forever home
A growing share of our Beaches enquiries are owners replacing an old weekender with a permanent family home. It is classic knockdown rebuild territory: the land and position are irreplaceable, the structure is not. We run the full sequence — demolition, design, approval, build — as one accountable programme.
Questions.
What does building in a bushfire (BAL) zone mean for my project?
A Bushfire Attack Level rating sets mandatory construction standards — ember-sealed junctions, specific glazing, non-combustible cladding at higher ratings — that affect design and cost. It rarely prevents building; it changes how you build. Merc.Build designs to the site's BAL from day one and manages the bushfire consultant's certification through approval.
How do you protect a new coastal home from salt corrosion?
By specifying for the marine environment rather than treating it later: 316 stainless steel fixings and balustrades, marine-grade or anodised aluminium, sacrificial coatings on steelwork, and cladding systems tested for coastal exposure. Detailing matters as much as materials — drainage paths and ventilated cavities stop salt and moisture sitting where they do damage.