Brisbane & SEQ Costs & Pricing
Plan Draft’s granny flat plans are $4,990 fixed. This guide breaks down what that covers, and the other costs, certifier, engineering, council and construction, you should budget for alongside the drawings.
Plan Draft prepares granny flat (secondary dwelling) plans for a fixed $4,990 on a standard residential lot in Brisbane. That’s the price you pay for the drawing set, not a “from” figure or an hourly estimate. It covers the complete documentation your certifier needs:
It costs more than a carport ($2,490) or a deck or patio ($2,990) for a simple reason: a secondary dwelling is a full habitable building with a kitchen, bathroom, services and a more involved drawing set. The price reflects that scope.
The drawings are one line item in a granny flat project. To budget realistically, plan for these separate costs, which apply to any drafter’s plans, not just ours:
Private certification: the certifier assesses the drawings and issues building approval. For a secondary dwelling this is typically more involved than a carport or deck, and the certifier quotes their fee directly.
Structural engineering: slab, footings and framing certification, quoted by and paid directly to the engineer.
Site survey: a contour and detail survey may be required, quoted by the surveyor based on the block.
Council or development application fees, if your dwelling exceeds the accepted development parameters and needs a development application, council fees apply.
Infrastructure charges, some councils levy infrastructure charges on secondary dwellings above certain size thresholds. Whether they apply depends on your council and design.
Construction: by far the largest cost, and it varies widely with size, finishes and site conditions. Your builder quotes this directly. The plans are a small fraction of the total project.
A granny flat already carries several variable costs, engineering, certification, the build itself. A fixed drawing fee removes one of those variables entirely. You know the plan cost up front, before you commit, and it doesn’t move if the drawings take us longer than expected.
We can also coordinate with your engineer and certifier as part of the service, which keeps the documentation moving and reduces the back and forth that drives delays. Our granny flat approval guide explains the approval pathway in detail.
Plan Draft prepares fixed price granny flat plans for Brisbane and SEQ homeowners at $4,990, produced in 15–20 business days. Before you commit, we check your block against the council’s secondary dwelling rules and flag any likely additional costs, a development application, infrastructure charges, or a survey, so your budget is realistic from the start.
View the full granny flat plans service or send us your project details for a clear answer on suitability and cost.
Plan Draft charges $4,990 fixed for granny flat (secondary dwelling) plans in Brisbane. That covers the full drawing set, engineer and certifier coordination, one revision round, and the final PDF for approval.
Budget for private certification, structural engineering, a site survey if required, possible council or development application fees, infrastructure charges where they apply, and the build itself. These are paid separately to the drawing fee.
A secondary dwelling is a full habitable building with a kitchen, bathroom, services and a more involved drawing set, including existing and proposed plans and a cross section. That is why it sits at $4,990 compared with $2,490 for a carport or $2,990 for a deck or patio.
Yes. For a standard secondary dwelling on a standard residential lot the $4,990 price is fixed, with no variations within the standard scope. If a site is unusually complex we tell you before any work begins.
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$4,990 fixed for the plans. Send us your project details and we’ll confirm suitability and flag any likely extra costs within one business day.