Timber Decks on the Sunshine Coast
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What a timber deck is
A timber deck is a frame of posts, bearers and joists with boards fixed across the top. The boards are usually treated pine or a hardwood, and the frame can be treated pine or something stronger. The choice sets the price, the look and the upkeep for as long as the deck stands, so it is worth deciding before you gather quotes.
Treated pine
A national guide says treated pine typically costs $200 to $350 per square metre installed for a standard ground-level deck. It is the cheapest board in common use and the default on budget builds. The same guide says pine is a softwood that dents and weathers faster than hardwood and needs a coating on day one and recoating every one to two years.
Hardwood species
The guide says common species such as merbau, spotted gum, blackbutt and ironbark typically cost $300 to $500 per square metre installed. Hardwood costs more at the timber yard and more again in labour because it is dense and hard on fixings. It lasts longer, resists dents and still needs oiling to hold its colour.
Name the species
The guide warns that cheaper imported hardwoods vary widely in durability and sourcing, and that the species should be named in the quote rather than described only as hardwood. Ask each business to name the species, the board width and the grade, and to say where the timber comes from if you care.
The frame beneath
The guide points out that posts and framing in ground contact are the usual failure points on timber decks, so the treatment level matters. Ask what the frame is made of and what treatment rating it has, and whether the footings are concrete or the posts are set in the ground.
Footings and soil
Footing depth and diameter respond to soil type and height. Reactive clay, fill, rock or a sloping block all add cost. Buderim sits on a mountain of red volcanic soil according to Wikipedia, while the coastal strip is sand and plains, so footings are not one-size-fits-all. Ask for the footing design in writing.
Approval triggers
Sunshine Coast Council says a development building work permit is needed for decks that exceed 10 m², exceed 5 m on any side, exceed a mean height of 2.1 m with a maximum of 2.4 m, or are 1.0 m or higher above the surface below. A private building certifier can tell you whether your plan is caught.
Ground-level decks
The guide says a deck within a few hundred millimetres of the ground is the cheapest form, but low clearance restricts airflow, traps moisture and shortens the life of the substructure. Ventilation and termite management matter more when the deck hugs the ground. Ask how the builder plans to keep air moving under the boards.
Fixings and spacing
Visible screws are the cheapest and most forgiving fixing. Hidden clip systems give a clean face but add cost and make replacing a single board harder. Board gaps, picture-frame borders and wide boards also move the rate. None is wrong. Ask for the fixing method and the joist spacing to be written into the quote.
Bushfire areas
The Queensland Government says Queensland has adopted AS 3959 for construction in bushfire prone areas, and that in the most extreme areas new homes need non-combustible material on the roof, veranda or deck. The rules reach additions within six metres of a dwelling. Ask the council whether your property is in a designated bushfire prone area.
Licences
The QBCC says a licence is required for building work valued over $3,300. Most timber decks cost more than that. Ask each business which licence it holds and check it on the QBCC public register yourself. We do not check anyone for you, and we do not say any business is licensed.
Compare like with like
Ask every business to price the same written description: area, height, board and species, fixing, joist spacing, footings, stairs, balustrade, approval and finish. A price for hardwood on wide joist spacing is not comparable with a price on a tighter frame. A written scope makes differences easy to see.
Getting started
Send your suburb, the size, the height above the ground, and whether a roof, stairs or a balustrade are wanted. Independent deck builders who work near you may reply, and you compare the written scopes and check each builder's licence yourself.
How much does a timber deck cost?
One national guide gives about $200 to $350 per m² for treated pine and $300 to $500 for hardwood, installed, ground level. It is not a Sunshine Coast quote.
Is pine or hardwood better?
The guide says hardwood lasts longer and resists dents, while pine is cheaper and needs more frequent recoating.
Does a timber deck need approval?
Sunshine Coast Council lists triggers such as over 10 m², a side over 5 m or a height of 1.0 m or more. Ask a private building certifier.
Do I need a licensed builder?
The QBCC says a licence is required for building work valued over $3,300. Ask for the number and check the register.