Decking Mosman — Timber & Composite Deck Builders
5 Star Decking builds and replaces decks across Mosman and Sydney’s Upper North Shore. One of Sydney’s most prestigious suburbs, Mosman is home to some of the city’s finest properties — many with harbour views, generous outdoor spaces, and a genuine appetite for quality outdoor living. We deliver premium deck builds using the finest hardwood timbers and zero-maintenance composite products, backed by a 2-year workmanship guarantee and NSW Contractor Licence 395250C.
Whether you’re building a new entertainer’s deck on a sloping block, replacing old weathered Merbau with a low-maintenance composite, or adding a pool surround to an existing space — we handle the whole project from design to handover.
Decking Services in Mosman
Composite Decking — from $550/m²
Zero-maintenance composite boards — no oiling, no sanding, no repainting. Perfect for Mosman’s harbour-facing properties where salt air and moisture accelerate timber wear. We install premium brands including Millboard, Evalast, Modwood, and Modelo, with 25-year product warranties on selected ranges. Millboard’s Lastane® surface carries a P5 anti-slip rating — the highest in Australia — making it the preferred choice for pool surrounds and elevated coastal decks.
Hardwood Timber Decking — from $440/m²
Spotted Gum, Blackbutt, and Merbau installations built to last. Premium-grade hardwood with C24 treated pine joists at 400mm centres. Requires oiling every 12–18 months — the natural look that never goes out of style in a suburb like Mosman. We source new timber only — no recycled or reclaimed product without your explicit approval.
Pool Decking
Slip-resistant composite and hardwood pool surrounds built for coastal conditions. P4 and P5-rated boards for wet areas — safe, durable and great-looking. We build curved and shaped pool surrounds to complement any pool design, working around existing landscaping and fencing.
Elevated & Split-Level Decks
Mosman’s sloping blocks and elevated homes demand structural expertise. We design and build raised multi-level decks with engineered footings, posts, and beams — fully compliant with Australian Standards and the National Construction Code. All structural work is documented and inspected.
Glass Balustrades
Frameless and semi-frameless glass balustrades — the preferred choice for Mosman harbour-view decks. Preserve the water view while keeping the space safe and compliant. We supply and install toughened safety glass panels with quality stainless or aluminium hardware.
Deck Restoration — Sand, Oil & Repair
If your existing hardwood deck is structurally sound but looking tired, a full sand-back and re-oil can transform it for a fraction of replacement cost. We assess the subframe, replace any failed boards or bearers, then sand back to fresh timber and apply two coats of quality penetrating oil. Mosman’s salt-air environment accelerates weathering — annual or biennial oiling is essential.
Deck Replacement
Full deck replacement from the subframe up. We remove old decking safely, inspect and replace bearers and joists where needed, and install a fresh new deck — not just boards over a rotten frame. If the structure is failing, we fix it properly.
Why Choose 5 Star Decking in Mosman?
- NSW Licensed — Contractor Licence No. 395250C
- 2-year workmanship guarantee on all installations
- New materials only — no recycled or reclaimed timber without your knowledge
- Experienced with elevated, waterfront, and sloping blocks across Mosman
- Free, no-obligation quotes with detailed written breakdowns
- We do not subcontract — your quote is your price
- 4,000+ projects completed across Sydney
Decking Prices in Mosman
| Service | Price from |
|---|---|
| Hardwood Timber Decking (Spotted Gum, Blackbutt, Merbau) | $440/m² |
| Composite / Pool Decking (Millboard, Evalast, Modwood) | $550/m² |
| Deck Restoration (Sand, Oil & Repair) | $150/m² |
All prices are fully inclusive — materials, labour, waste removal, and site protection. Elevated builds or complex structural work may involve additional engineering costs, which are fully itemised in your written quote before work begins. No surprises.
Mosman Decking — What to Expect
Mosman blocks present specific challenges that not every builder handles well. Many properties are on steep, north-facing slopes with poor vehicle access, soft sandstone subsoils, and proximity to established trees with extensive root systems. We’ve built on blocks across Balmoral, Clifton Gardens, Spit Junction, and Chowder Bay — we know the terrain.
Salt air off Sydney Harbour also accelerates weathering faster than most inland suburbs. For composite, this means zero maintenance and guaranteed colour stability. For hardwood, it means a strict oiling schedule — ideally every 12 months — to prevent premature graying, surface cracking, and board splitting.
Our team always conducts a pre-quote site inspection in Mosman — it’s not optional. The site survey informs the structural design, the material recommendation, and the price. You get one fixed price with no variation unless you change the scope.
Areas We Cover Near Mosman
We regularly work across Mosman, Cremorne & Cremorne Point, Neutral Bay, Cammeray, Northbridge, Castlecrag, Balmoral, Spit Junction, and Taronga. If you’re anywhere on the Upper North Shore, we cover your area.
For broader North Shore coverage see our Decking North Shore Sydney page.
Deck Oiling in Mosman — Recent Project
Mosman’s harbour-front position means constant salt spray and intense UV — your deck needs professional oiling every 6-12 months. Here’s a recent oiling job we completed in the area:
For the full guide on protecting your Mosman deck from salt air and UV — including product recommendations, pricing, and a maintenance schedule — read our Deck Oiling in Mosman guide.
Get a Free Quote in Mosman
Call us on 0433 334 415 or fill in our online quote request and we’ll call you back within one business day. We provide detailed written quotes — no vague estimates.
NSW Contractor Licence: 395250C