Second Story Additions Perth
Keep the street, the school catchment and the backyard, and double the house. Second storeys are the most technical thing in residential building, which is exactly why a PM-and-QS-led builder should do yours.
What we deliver
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Full second storey additions: parents' retreats, kids' zones, home offices with views.
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Partial additions and lofts over garages or rear wings.
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Structural engineering, existing footings and walls assessed first, so the design your heart settles on is one your house can carry.
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Staged construction that keeps you living downstairs for most of the build, subject to the build.
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Complete approvals, engineering and energy compliance.
How much does a second storey addition cost in Perth?
For 2026: $3,200 to $6,000 per sqm is the honest range.
A typical 80 to120 sqm second storey lands between $350k and $600k including stairs, structural work and re-roofing.
The first question is always whether your ground floor can take the load; our feasibility includes a structural read of your home before you fall in love with a design. Compare the total to the cost of moving to a two-storey home in your suburb and the maths often surprises people.
The most technical build in the suburbs
A second storey is demolition, structure, waterproofing and weatherproofing happening above your family's heads. Program discipline isn't a luxury, and a slow builder means months under tarps. Our roof-off windows are planned around weather forecasts, the new floor goes weather-tight in a scheduled sprint, and you'll know the exposed-roof dates before you sign the contract.