We get this question on almost every backyard quote. The short answer: a deck adds more usable floor area, a pergola adds more usable hours per year. Pick based on how the space actually works today.
Decking — extends the floorplan outward
A deck is read by buyers and valuers as additional living area, especially when it's level with the back of house and accessed by sliding doors. Cost-wise you're looking at $400–$650/m² for merbau or spotted gum on a standard subframe.
Best ROI: when your existing rear room opens onto an awkward step-down or a patch of sad lawn nobody uses.
Pergola — extends the calendar
A roofed pergola turns a 4-month outdoor area into a 10-month one. Steel-framed with Colorbond roofing typically runs $800–$1,400/m² depending on span and lighting. Add cafe blinds and you're at year-round use.
Best ROI: when you already have a usable paved area or deck, but it's unusable in summer afternoons or winter evenings.
When to do both
If the budget supports it, a deck under a pergola is the highest-value combination — it reads as an outdoor room rather than just landscaping. It's also the package most buyers in Newport, Yarraville and Williamstown actively look for.
