New decks, restoration and repairs built for the tropics
We assess the structure before we quote the surface
A deck is the best room in a Darwin house for about seven months of the year, and the fastest-ageing part of it for all twelve. Intense UV breaks down coatings, wet season humidity drives moisture into end grain, and termite pressure in the Top End is among the highest in Australia. A deck built and maintained to southern assumptions does not last here, and the damage usually starts underneath where nobody is looking.
AusMCo builds new decks, restores tired ones and repairs the structural problems that come with age in the tropics, across Darwin, Palmerston and the rural area. Before we quote we lift a board and look at the subframe, because the honest answer to “can this be saved?” is underneath the deck, not on top of it.
Ground-level and elevated, timber or composite
Clean, sand, repair and re-oil back to new
Cupped, split, greyed or rotted boards swapped out
Bearers, joists, stumps and ledger fixings
Structural replacement after pest treatment
No oiling, no termite food, lowest long-term upkeep
Compliant balustrade heights, treads and handrails
Slip-resistant decking with pool barrier in mind
Dense, hard-wearing and the look most people picture when they say “deck”. In Darwin it needs oiling every year, not every second or third, and the end grain needs sealing as it is cut. Left alone it greys, surface-checks and eventually splinters. Worth it if you like the material and will keep up the maintenance.
The cheapest way to get a deck built and the most demanding to keep. It moves more, it needs the correct treatment level for its exposure, and in-ground or close-to-ground elements need the higher treatment grades. Fine for a budget build you are prepared to maintain.
Higher install cost, then almost nothing. No oiling, no sanding, nothing for termites to eat, and it holds colour under Darwin UV far better than a coating does. Dark boards do get hot underfoot in the build-up, so colour choice matters. Over ten years it is usually the cheapest deck you can own here, which is why it suits rentals.
The most durable and the least common, mostly used where fire rating, span or absolute low maintenance matters more than the timber look. Worth asking about for an elevated deck in an exposed position.
The boards look tired but the real problem is below: bearers and joists that never dry out. It happens when the deck sits too close to the ground, when there is no cross-flow ventilation underneath, or when boards were laid hard together so water sits in the joint instead of draining through. By the time a board feels springy the structure has been wet for years.
A deck gives termites a sheltered, humid, timber-rich path toward the house. Decks attached to the building without correct detailing can bridge termite management systems entirely. We look for this on every deck inspection, and if we find activity the pest treatment comes first and our repair comes second.
Where an elevated deck attaches to the house is the highest-consequence connection on the whole structure. Corroded or undersized fixings, or a ledger fixed through cladding into nothing solid, is how decks fail suddenly rather than gradually. Coastal salt load accelerates it. This is the first thing we check on any raised deck.
Darwin UV is relentless. A deck oiled on a southern schedule will be grey and checked within two years. Once the surface has opened up, oil no longer penetrates properly and the deck needs sanding first — which is a bigger job than simply keeping it oiled would have been.
Decks above a certain height need a balustrade of a minimum height with gap limits that stop a small child passing through or climbing. Older Darwin decks frequently fail this, and it tends to surface at sale or at a rental inspection. It is a straightforward fix once identified.
Not every deck is a maintenance job. Depending on height, area and whether it is attached to the house, a deck in the Northern Territory can require a building permit, and building work above the Territory's contract-value threshold must be carried out by a registered building practitioner.
We tell you which side of that line your job sits on at quote time. Where a job needs a permit or a registered practitioner we coordinate it properly — AusMCo coordinates a network of licensed and registered Darwin trades rather than claiming every ticket in-house. A deck quietly built without the permit it needed becomes your problem at sale, not ours, so we would rather have the awkward conversation up front.
August–October (late dry): the window for sanding and oiling. Timber is at its driest, there is no rain to ruin a fresh coat, and the deck goes into the wet season protected. This is the single most valuable thing you can do for a timber deck here.
November–December (build-up): clear leaf litter from between boards and from under the deck before the rain. Trapped debris holds water against timber for months.
January–March (wet): watch for springy boards, mould and standing water. Check that water is draining away from the house, not pooling against the subframe.
April–May (end of wet): the right time for an inspection. Any rot or termite activity from the wet is findable now, and repairs done in the dry are cheaper and faster.
A new deck, or bringing a grey and splintering one back to something you want to sit on.
Decks are a common inspection finding. Composite and structural repairs reduce the recurring maintenance bill.
Balustrade compliance, rotted boards and trip hazards identified, quoted and documented.
AusMCo builds and repairs decking throughout Greater Darwin:
There is no single answer, but there is a clear trade-off. Merbau and other dense hardwoods handle the UV and look the part but need oiling every year here, not every two or three. Treated pine is cheaper up front and needs the most upkeep. Composite and aluminium decking cost more to install but do not need oiling, do not feed termites and are the lowest-maintenance option in the tropics. For a rental or a deck you do not want to think about, composite usually wins on total cost over ten years.
As a guide, treated pine runs roughly $200–$350 per square metre supplied and installed, hardwood $350–$550, and composite $400–$700. Elevated decks cost more than ground-level because of the subframe, stumps and balustrade, and anything over a metre high needs a compliant balustrade. We quote on site.
Annually for a timber deck, and the right time is late in the dry season, around August to October, before the wet arrives. Darwin UV strips coatings far faster than southern climates, so a deck oiled on a two-year southern schedule will grey and check. A deck that has been left too long usually needs sanding before it will take oil properly.
Very often, yes. If the subframe, bearers and joists are sound, replacing surface boards and re-oiling gives you a deck that looks new for a fraction of a rebuild. What forces a rebuild is rot or termite damage in the structure underneath, which is why we lift a board and look before quoting rather than pricing off the surface.
It depends on the height, the size and whether it is attached to the house. Some decks need a building permit in the NT, and building work above the Territory's contract-value threshold has to be done by a registered building practitioner. We will tell you which category your job falls into at quote time and coordinate the right people where it is needed, rather than quietly building something that should have been permitted.
Because moisture gets trapped and never dries. The usual causes are a deck built too close to the ground with no ventilation, boards laid with no gap so water sits, and no fall away from the house. In the wet season that is a permanently damp timber sandwich. Correct ground clearance, board spacing and drainage are what make a deck last here.
Yes, and it is a common job in Darwin. Pool surrounds need slip-resistant decking, correct drainage away from the pool, and careful attention to the pool barrier — a new deck must not create a climbable point that compromises pool fence compliance. We factor that in rather than discovering it at inspection.
See also carpentry and building maintenance , fencing , pergolas and carports , shade sails , pressure cleaning and painting .
There is no single answer, but there is a clear trade-off. Merbau and other dense hardwoods handle the UV and look the part but need oiling every year here, not every two or three. Treated pine is cheaper up front and needs the most upkeep. Composite and aluminium decking cost more to install but do not need oiling, do not feed termites and are the lowest-maintenance option in the tropics. For a rental or a deck you do not want to think about, composite usually wins on total cost over ten years.
As a guide, treated pine runs roughly $200-$350 per square metre supplied and installed, hardwood $350-$550, and composite $400-$700. Elevated decks cost more than ground-level because of the subframe, stumps and balustrade, and anything over a metre high needs a compliant balustrade. We quote on site.
Annually for a timber deck, and the right time is late in the dry season, around August to October, before the wet arrives. Darwin UV strips coatings far faster than southern climates, so a deck oiled on a two-year southern schedule will grey and check. A deck that has been left too long usually needs sanding before it will take oil properly.
Very often, yes. If the subframe, bearers and joists are sound, replacing surface boards and re-oiling gives you a deck that looks new for a fraction of a rebuild. What forces a rebuild is rot or termite damage in the structure underneath, which is why we lift a board and look before quoting rather than pricing off the surface.
It depends on the height, the size and whether it is attached to the house. Some decks need a building permit in the NT, and building work above the Territory's contract-value threshold has to be done by a registered building practitioner. We will tell you which category your job falls into at quote time and coordinate the right people where it is needed, rather than quietly building something that should have been permitted.
Because moisture gets trapped and never dries. The usual causes are a deck built too close to the ground with no ventilation, boards laid with no gap so water sits, and no fall away from the house. In the wet season that is a permanently damp timber sandwich. Correct ground clearance, board spacing and drainage are what make a deck last here.
Yes, and it is a common job in Darwin. Pool surrounds need slip-resistant decking, correct drainage away from the pool, and careful attention to the pool barrier — a new deck must not create a climbable point that compromises pool fence compliance. We factor that in rather than discovering it at inspection.
Contact AusMCo or call 0468 552 206 for a free quote.