A newly built deck needs very little for its first year or two, but every deck material eventually asks for some upkeep — knowing what to expect helps you budget for it rather than being surprised.
Treated pine
The most affordable decking timber, treated pine needs re-oiling or re-staining roughly every one to two years to stop it greying and to keep water out of the timber. Skipping this does not ruin the deck immediately, but it shortens its life and it will look tired well before it structurally fails.
Hardwood
Timbers like merbau or spotted gum are denser and more durable than pine, and handle a missed maintenance cycle better, but they still benefit from periodic oiling to maintain colour and protect against splitting. Left completely untreated, hardwood decking will silver over time — some homeowners like that weathered look, others do not.
Composite decking
Composite boards (a mix of timber fibre and recycled plastic) are the lowest-maintenance option — no staining or oiling required, generally just a wash down. They cost more upfront than timber but the ongoing time and cost commitment is much smaller over the life of the deck.
What every deck needs regardless of material
Gaps between boards should stay clear of leaf litter and debris, which traps moisture against the timber and framing underneath. Underneath the deck, ventilation matters — a fully enclosed deck void without airflow accelerates timber decay in the structure you cannot see. Fixings and joist hangers are worth a visual check every year or two, since these are what a deck actually depends on structurally, not just the visible boards.
The bottom line
Maintenance is a real ongoing cost, not just an installation cost, and it varies a lot by material. Factoring it in when comparing quotes — not just the upfront number — gives a more honest picture of what a deck actually costs over the years you will own it.
