Short answer: usually yes. On the Gold Coast, a secondary dwelling (the scheme's term for a granny flat) is accepted development subject to requirements, meaning no development application, in the Low density residential (LDR), Medium density residential (MDR) and High density residential (HDR) zones, provided its gross floor area does not exceed 80 m². That is the most generous granny-flat GFA cap we have verified in South East Queensland so far. But City Plan 2016 carries a genuine internal tension around that number in MDR and HDR that catches owners who read only the code's purpose wording, covered below.
One thing holds regardless of zone: a secondary dwelling is assessed under the Secondary dwelling code (9.3.18) as part of the broader Dwelling house use, and "accepted subject to requirements" is not "no conditions apply". The proposal is not lodged as a development application at all provided it meets every requirement in the code's accepted-development benchmarks (Table 9.3.18-1) and every other code the assessment tables nominate, including any overlay code triggered on the parcel; miss one and the same use can drop to a different assessment track for your zone.
The 80 m² test, zone by zone
City Plan 2016's tables of assessment set the category for a dwelling house involving a secondary dwelling as follows (Part 5 Tables 5.5.1 LDR, 5.5.2 MDR and 5.5.3 HDR, verified against the operative scheme, 3 July 2026):
- LDR (Table 5.5.1): accepted subject to requirements, no DA, where the secondary dwelling's GFA does not exceed 80 m². Because Table 5.5.1 has no code-assessment row for a secondary dwelling above that figure, an LDR granny flat over 80 m² falls to the table's impact catch-all, the harder assessment track with public notification.
- MDR (Table 5.5.2) and HDR (Table 5.5.3): accepted subject to requirements, no DA, up to the same 80 m² GFA. Above 80 m², both tables carry an explicit code-assessment row for "a secondary dwelling with a GFA exceeding 80m²", referencing the Secondary dwelling code as the assessment benchmark, so MDR and HDR at least keep a code-assessable pathway open rather than jumping straight to impact.
The zone changes what happens once you cross 80 m², from impact in LDR to code assessment in MDR/HDR, but the 80 m² line itself is the same figure in all three zones, and it is the number every design starts from.
The trap: MDR and HDR do not actually waive the 80 m² cap
City Plan 2016's Secondary dwelling code opens with a purpose statement that reads more generously than the enforceable benchmark behind it. The overall outcome (9.3.18.2(a)) says that in MDR, HDR, Rural residential and Rural zones, a secondary dwelling's GFA must be "noticeably smaller in size than the primary dwelling house", a subordinate-function test with no fixed number, while every other zone (LDR included) gets 80 m² directly. Read alone, that wording suggests MDR and HDR escape the fixed cap. They do not: the code's specific benchmarks, the part actually tested for accepted and assessable development, do not repeat that carve-out. The scheme's own words (Table 9.3.18-1 RO4, accepted development, and Table 9.3.18-2 PO4, assessable development; AO4 itself reads "No acceptable outcome provided.", verified 3 July 2026):
"The GFA of the secondary dwelling does not exceed 80m²"
No MDR, HDR, Rural residential or Rural exception is written into that benchmark. A secondary dwelling over 80 m² in MDR or HDR should not be assumed to clear the "noticeably smaller" test automatically just because the purpose text sounds looser; it needs a specific council pre-lodgement enquiry or planner check before you design past 80 m², not a presumption that the purpose wording overrides the benchmark table.
Where the secondary dwelling has to sit
Alongside the GFA cap, the code sets a location and proximity test (9.3.18.3, RO1/PO1-AO1). The secondary dwelling must be attached to the primary dwelling, or within 10 m of it, with two zone-specific exceptions: up to 20 m in the Rural residential and Rural zones (excluding their landscape and environment precincts), and up to 3 m in the Conservation zone and in the Rural residential and Rural zones' landscape and environment precincts. The 10 m default is the figure to plan around outside the rural and conservation zones; place the two dwellings further apart than that and the proximity benchmark, not just the GFA, becomes the thing to check.
Flood does not usually change the category here
Where the Flood overlay maps a parcel as requiring flood assessment, the Gold Coast scheme is unusually settled on what that means for an already-accepted use. Table 5.10.11 (Flood overlay, verified 7 July 2026) applies across every zone except Major tourism: a use provisionally accepted under another table of assessment, such as a secondary dwelling meeting the 80 m² and proximity benchmarks, stays accepted, and the flood code simply adds its own requirements on top. The only flood-triggered code assessment in that table is for standalone earthworks over 5 m³ not tied to building work or a change of use. Flood severity (levels, velocity, site works) still matters for how the secondary dwelling is built and sited; it just does not, on its own, change the assessment category of an accepted granny flat.
If the numbers do not work, dual occupancy is worth checking too
A secondary dwelling and a dual occupancy (duplex) are different products with a different sale outcome, and the Gold Coast's rules for each run differently by zone. A granny flat, wherever it is accepted, is not separately saleable; it stays on the one title with the main house. A dual occupancy is typically titled so the two dwellings sell separately while the land stays one lot, though that titling step is its own process your solicitor or town planner advises on. On assessment category, MDR and HDR treat dual occupancy as accepted development subject to requirements unconditionally; LDR (outside the Large Lot precinct, which runs on its own table of assessment) only extends that pathway where the lot has dual frontage or is mapped RD1 or greater on the Residential density overlay, and drops to impact assessment otherwise. The dual occupancy building itself also carries its own frontage benchmark under the Dual occupancy code (Table 9.3.5-1 RO1 and Table 9.3.5-2 PO1/AO1), at least 20 m of road frontage, separate from the secondary dwelling's proximity rule above. Which of the two products fits your block is a design and title question worth running past a planner once you know the zone and the numbers.
How to check your own block
- Confirm your zone (LDR, MDR or HDR) on the City of Gold Coast's eplan, then read the relevant table of assessment (5.5.1, 5.5.2 or 5.5.3) for the secondary dwelling row.
- Design to 80 m² GFA first. If you need more than that in MDR or HDR, treat the purpose wording as informal context only and get a pre-lodgement enquiry or planner check before assuming the "noticeably smaller" test lets you exceed the benchmark table.
- Check the proximity test (10 m default, with the Rural/Rural residential and Conservation zone exceptions) against your actual site layout, and check the Flood overlay and any other overlay mapped on the parcel for the requirements they add, and whether they change the assessment track for your parcel.
This page is general information about the Gold Coast planning scheme, not advice about your property. Overlay effects vary lot by lot, planning schemes amend, and the council's current scheme prevails. Do not rely on this page for a specific property. Get a site-specific report or independent professional advice before acting. We work with town planners, not in place of them: where a pathway depends on design or professional judgement, a town planner or the relevant qualified professional confirms it for your specific proposal.
Want the answer for your block? Our $690 site-specific report reads the zone, every overlay mapped on the property and the surviving development pathways for one property, with every figure cited to the scheme. Not ready for that? Start with the free development risk checklist, read our Gold Coast planning and zoning guide, or see how the numbers change if you are looking at splitting the block instead in Can I Subdivide My Land on the Gold Coast?
Sources: Gold Coast City Plan 2016 (the council's official eplan), including the Secondary dwelling code (9.3.18), Part 5 Tables of Assessment 5.5.1 (LDR), 5.5.2 (MDR) and 5.5.3 (HDR), the Dual occupancy code (9.3.5) and the Flood overlay (Table 5.10.11). Everything on this page comes from the council's own published planning scheme; we explain it in plain English. The scheme text itself is the authority.
Published by LandIntel. How we research: our methodology.
Verified 3 to 7 July 2026 against Gold Coast City Plan 2016, Version 13 (commenced 9 December 2025); schemes amend, and the live scheme prevails.