Granny Flat Permit Melbourne — The 2026 Planning + Building Permit Walkthrough for Landlords

Before Amendment VC253 came into operation on 14 December 2023, a second self-contained dwelling on a residential lot was generally a planning permit question: a council assessment, notice to neighbours where the scheme required it, and the possibility of objections and a VCAT review. VC253 introduced the planning term small second dwelling and, for an eligible dwelling of up to 60 m² in the main residential zones, removed the planning permit requirement.

Amendment VC306 came into operation on 15 October 2026. It raised the limit in Clause 73.03 to a total floor area of no more than 80 m², measured from the outside of the external walls (or the centre of a party wall) and excluding attached decks, verandahs, pergolas, porches and other attached roofed or unroofed structures [1, 2]. It also deleted the Clause 54.03-5 safety-and-accessibility standard for small second dwellings. The other planning conditions did not change. In the General Residential Zone (Clause 32.08) no planning permit is needed when the lot is 300 m² or more, no more than one dwelling already exists on it, the new building is the only small second dwelling, and it is not connected to reticulated natural gas; on a lot under 300 m² a permit is still required [3]. Overlays, other zone conditions, covenants and Section 173 agreements can still require a permit or rule the dwelling out.

The building rules have not caught up. A building permit is always required, and the Building Regulations 2018 in force on 21 October 2026 (authorised version 031) still define a small second dwelling as a Class 1a building of no more than 60 m² (reg 5(1)) [4]. For a design between 60 and 80 m², ask the relevant building surveyor to confirm the building pathway before you commit to drawings.

For a landlord, the practical change is scope: a two- or three-bedroom design of up to 80 m² can now sit in the planning-exempt category on an eligible lot, where anything over 60 m² previously needed a permit. In OptimaRea's connected portfolio on 19 October 2026, the 25 verified main-house + granny-flat address pairs (out of 34 managed granny-flat addresses) had a mean combined current contracted rent of $904.29 a week before costs — an observation about those leases, not a forecast for another lot; the leasing dashboard shows the method. We covered the post-build management of that configuration in our granny flat rental management guide for Melbourne dual-living landlords, and the leasing side of an 80 m² dwelling in renting out an 80 m² second dwelling under VC306. What follows here is the front half of the journey: confirming the pathway, getting the build done, and avoiding the traps that still stop projects.

Corrected 21 October 2026: earlier versions of this article dated the reform to 2021 and described council-by-council minimum lot sizes and a 60 m² cap as the current rule. They have been replaced with the VC306 rule and its primary sources.

Before you spend a dollar on drawings, run the eligibility test. A property that fails one of the planning gates below is not necessarily barred from a second dwelling — it needs a planning permit application instead of the exempt route, with the cost and time that implies.

Size: up to 80 m² total floor area. Count every floor used as the dwelling, measured to the outside face of the external walls (or the centre of a party wall). Attached decks, verandahs, pergolas, porches, patios and terraces are excluded from the planning measure [2]. A 78 m² design can therefore carry a covered deck without breaching the planning limit — but while reg 5(1) of the Building Regulations still says 60 m², the building surveyor confirms how a design over 60 m² is assessed [4].

Zone. The conditions quoted here are from Clause 32.08, the General Residential Zone that covers much of suburban Melbourne [3]. Other residential zones carry their own small-second-dwelling provisions, and non-residential zones have their own rules. Read the zone that actually applies to the lot on its planning property report.

Lot: 300 m² or more. In the General Residential Zone a permit is required to construct or extend a small second dwelling on a lot of less than 300 m² [3]. There is no state rule that the lot must be 550 m² or 650 m². Whether a dwelling physically fits — setbacks, access, services, trees, private open space — is a separate design question for each lot.

One existing dwelling, one small second dwelling. No more than one dwelling may already exist on the lot, and the new building must be the only small second dwelling on it [3]. A garage already converted into a self-contained unit is a dwelling for this test.

No reticulated gas. The small second dwelling must not be connected to reticulated natural gas [3]. Plan it all-electric from the start — which also removes a gas-safety check from the rental compliance schedule.

Overlays and title — this is where projects stop. Heritage, flood, bushfire, vegetation and other overlays can still require a planning permit for buildings and works whatever the dwelling's size, and a covenant or Section 173 agreement on title can prevent the dwelling regardless of planning. A Bushfire Management Overlay also adds defendable-space, construction and water-supply requirements that change the budget.

Before you spend on design, pull the property's planning report from the Victorian Government's planning maps service, read every zone and overlay listed against it, and order a current title search. A single overlay or covenant can stop the plan, and you want to know on day one, not month three.

Once eligibility is confirmed, the first technical step is engaging a registered surveyor for a feature and level survey of the rear yard and a geotechnical engineer for a soil classification report.

Feature and level survey maps every existing feature on the site — boundary fences, existing structures, large trees and their canopy spreads, services (sewer manholes, stormwater pits, electricity pole positions), and ground levels. Expect to pay $600–$1,000 for a small backyard survey. The surveyor produces a CAD file that goes directly to your draftsperson or architect for the SSD siting work.

Soil classification report is a geotechnical test that determines the soil reactivity class — A (most stable), S, M, H1, H2, E, or P (problem site). This classification drives the entire footing design. Soft reactive clay sites (Class H1 or H2, very common across much of Melbourne's outer south-east) require bored piers down to stable strata, which materially increases the slab and footing cost. A Class P site — often because of fill, slope, or proximity to a watercourse — may require engineered raft slabs or screw-pile foundations. Expect to pay $300–$600 for the soil report including a 2–3 hole borehole investigation.

These two reports together cost $800–$1,500 and they unlock everything downstream. Skip them and your builder will quote on assumptions; the moment the excavator hits unexpected ground, your contract goes into variation territory and you lose price certainty. We routinely see landlords try to save $1,200 here and pay $8,000 in unplanned variations later.

With surveys in hand, the next step is design. There are two real options: a project-home builder who supplies a pre-designed SSD from their catalogue and adapts it to your site (cheaper, faster, less character), or an independent draftsperson or architect who designs from scratch (more flexible, more character, more cost).

Project-home SSD catalogue. Most of the major granny flat builders operating in Melbourne — Backyard Pods, Granny Flat Solutions, several large-display-home operators with secondary-dwelling lines — maintain a library of pre-designed second dwellings, typically from a 30 m² one-bedroom studio to two- and three-bedroom layouts. Since VC306 an 80 m² design can fall within the planning-exempt category on an eligible lot; OptimaRea's build partner publishes its current 34, 60 and 80 m² homes on the granny flat page. For anything over 60 m², have the building surveyor confirm the building pathway before you sign. The design is included in the build contract; you pay nothing separately for the drawings beyond a small site-adaptation fee, typically $500–$1,500. The trade-off is rigidity — you choose from the catalogue, and substantial changes are either declined or quoted as expensive variations.

Independent draftsperson ($2,500–$3,500). A registered building draftsperson works to your brief, produces a custom design that fits the site, and delivers full working drawings ready for building permit lodgement. This is the most common pathway for landlords who want a specific layout — most often, a separate-entry 2-bedroom with the bedroom heads positioned away from the main-house bedroom heads for acoustic privacy.

Architect ($4,500–$5,500 for SSD scale). A registered architect produces a more design-led outcome with attention to passive solar orientation, natural ventilation, double-glazing scheduling, and material selection. The cost premium is meaningful but on a property you intend to hold for 20+ years and rent through 30+ tenancies, the lifetime difference in tenant retention and rental premium tends to recover the spend.

Whatever path you choose, the drawings package that goes to the Building Surveyor for permit lodgement must include: site plan (with setbacks, building envelope, ResCode compliance notations), floor plan, elevations on all four sides, building section, electrical layout, plumbing layout, energy efficiency report (6-star NatHERS minimum, 7-star strongly preferred for rental durability), and a soil-classified footing detail.

The Building Permit is issued by a private Building Surveyor registered with the Victorian Building Authority (VBA). It is the legal authorisation to commence works and it is entirely separate from a planning permit. Even though the SSD pathway exempts you from planning, you cannot skip the building permit — building without one is an offence under the Building Act 1993.

Choosing a Building Surveyor. Use the VBA's practitioner search to verify the surveyor's registration and ensure their registration covers the building class your SSD falls into (Class 1a for a freestanding secondary dwelling). Most metropolitan Melbourne builders have a preferred Building Surveyor they engage on every project — using the builder's surveyor is normal and efficient, provided you confirm registration independently.

Fees breakdown. Building Surveyor fee, including the permit issue and the four progress inspections, typically runs $1,800–$2,400 for a standard SSD. On top of the surveyor fee, the council charges a statutory Building Permit Levy and an Inspection Fee that total $400–$800 depending on the project value. Add CFA report if the property is in a Bushfire Management Overlay ($300–$500). Add Energy Safe Victoria fees for electrical and gas connections. The all-in permit-stage cost is $1,800–$3,200 for a standard SSD; outer-overlay or larger projects can push past $4,000.

Documentation lodged with the application. The Building Surveyor needs: full architectural drawings (site, floor, elevations, sections, electrical, plumbing); the soil report; the energy efficiency assessment (6-star NatHERS Whole-of-Home minimum); the builder's name, registration number, and Domestic Builder licence details; proof of builder's warranty insurance under the Victorian Domestic Building Insurance scheme; and evidence of compliance with any overlay requirements that still apply (most commonly, a BMO bushfire attack level assessment).

Timeline. From the moment a complete application is lodged with the Building Surveyor, the permit typically issues within 10–15 business days. Incomplete applications get RFIs (requests for further information) and can stretch to 4–6 weeks. The most common RFI is energy efficiency — the NatHERS rating often comes back at 5.8 stars on the first pass and needs minor design changes (more roof insulation, slightly larger eaves, double-glazing on the west elevation) to clear 6.0.

With the Building Permit issued, construction can start. A standard SSD build runs 12–20 weeks from site start to practical completion. Total elapsed time from go-decision to handover, including the survey/design/permit front end, typically lands at 4–6 months when no planning permit is needed — materially shorter than a permit pathway.

Mandatory inspection stages (4 stages). The Building Surveyor must physically attend and sign off the works at four points. Skipping any one of them voids the permit and creates a serious compliance problem on resale.

1. Bored piers / footings inspection — before concrete is poured into the footing trenches, the surveyor verifies bored pier depth, diameter, steel reinforcement, and boundary clearance against the engineer's footing design.
2. Slab inspection — after the slab steel is laid and before the concrete pour, the surveyor verifies reinforcement size, spacing, and slab thickness. Any plumbing rough-ins under the slab are inspected at this stage by a licensed plumbing inspector.
3. Frame inspection — once the frame is up but before plasterboard is fixed, the surveyor verifies framing dimensions, bracing, tie-down, structural openings, and roof structure. Electrical rough-in is inspected at the same stage by a Licensed Electrical Inspector (LEI) under the Energy Safe Victoria electrical certification regime.
4. Final / occupancy inspection — at practical completion, the surveyor inspects the entire works, verifies smoke alarms are hardwired, checks balustrade heights, wet area waterproofing, and energy efficiency compliance, and issues either an Occupancy Permit (dwellings with sleeping rooms) or a Certificate of Final Inspection.

Connections the builder's standard contract usually does NOT cover. This is where contract reading matters. Standard SSD contracts assume a 'typical' site connection — sewer and stormwater within 10m, electrical within 15m, water within 10m. If your site is non-typical, you pay for the extra distance: sewer beyond 10m runs $250–$400 per additional metre, electrical conduit beyond 15m similarly $200–$300 per metre. Rock-removal during footing dig is almost universally excluded — a Class M site can deliver an unexpected $4,000–$12,000 variation if shale or basalt is hit. Read the contract's exclusions schedule and price site-specific variations before signing.

Builder's warranty insurance is mandatory in Victoria for any domestic building works above $16,000 (every SSD will be). Administered by the Victorian Managed Insurance Authority through the Domestic Building Insurance scheme, the builder must provide a Certificate of Insurance before any deposit is paid. It protects you if the builder dies, disappears, or becomes insolvent during the build or within 6.5 years of completion. Premium is typically 1.0–1.5% of the build cost.

Costs move with the market and the site. The numbers below are mid-2026 ranges from actual builds OptimaRea has been involved in, either as the eventual property manager or as the buyer's-agent partner shepherding the landlord through the process.

30sqm one-bedroom SSD: $110,000–$130,000 + GST. Entry-level — one bedroom, one bathroom, combined kitchen-living. Best suited to single-occupant rentals (university student, downsizer, single working professional). 2026 rental expectation across the south-east corridor: $320–$380/week.

60sqm two-bedroom SSD: $160,000–$180,000 + GST. The OptimaRea sweet spot — two bedrooms, one bathroom, separate kitchen and living, often a small study nook. Best suited to couples, two friends sharing, or a parent with one school-aged child. 2026 rental expectation: $400–$480/week.

Larger custom secondary dwelling, 70–95 m²: $200,000–$280,000 + GST. Under VC306 a design of up to 80 m² total floor area can stay in the planning-exempt category on an eligible lot (with the building pathway for anything over 60 m² confirmed by the building surveyor). Above 80 m² — or where the lot size, an overlay or the title triggers a permit — budget for a planning application: typically $8,000–$15,000 of application and consultant fees and a 4–8 month timeline extension. The build benefit is a three-bedroom or two-bedroom-plus-study layout renting at $520–$620/week. In tighter rental markets like Mount Waverley, Box Hill, or Glen Waverley the larger build often wins on yield; in looser markets like Cranbourne or Werribee a 60 m² design is often more economically efficient.

Connection extras (separate from the build contract). Allow $4,000–$12,000 for sewer extension, electrical mains upgrade if the switchboard is undersized, separate water meter installation if the council allows it, and gas line extension or all-electric conversion. Allow $2,000–$5,000 for site clearance, tree removal, and access works.

Depreciation. The SSD build is a new structure, which means full Division 43 capital works depreciation at 2.5% per annum on the construction cost, plus Division 40 depreciation on appliances and fit-out, for the 40-year statutory life. On a $170K SSD build that is $4,250/year of capital works deduction alone, before fit-out depreciation. A quantity surveyor's depreciation schedule ($700–$900, fully tax-deductible) is mandatory to claim this. We cover the wider repair-vs-improvement framing in our rental renovation guide for Melbourne landlords.

The Occupancy Permit lands in your inbox, the builder hands you the keys, and the actual work begins. This is the stage every first-time SSD landlord underestimates and it is the reason OptimaRea built a specialist dual-living management practice in the first place.

Two separate leases, two bond lodgements, two condition reports. The whole point of the SSD is that you let it under a second, completely separate lease under the Residential Tenancies Act 1997 — separate RTBA bond, separate condition report, separate tenant. The contractual structure of two separate leases isolates almost every operational risk. Each dwelling produces its own 60–90 photo condition report attached to its own RTBA bond receipt; mixing the photo sets is the single fastest way to lose a bond claim at VCAT.

Shared infrastructure protocols. Driveway, bin, mailbox, and parking allocation are the day-one friction points. Our standard Special Conditions schedule pre-resolves all of them: numbered parking space per dwelling, designated bin slots, named bin-out responsibility, quiet hours of 9pm–7am weekdays and 10pm–8am weekends, and no unilateral modifications to shared assets.

Utility allocation. Electricity is typically separately metered on a new SSD build — configure this at the design stage (separate NMI, separate retail account). Water is rarely separately metered, so under the RTA's water billing rules the landlord pays the water bill unless both separate metering AND water efficiency requirements are met. A small second dwelling built without a planning permit must not be connected to reticulated natural gas, so it is all-electric by design; that also removes the most common dual-living gas dispute.

Maintenance and gardening. One gardener under the landlord's account, recovered through a small fortnightly line item in each lease — typically split 60/40 main house to granny flat. The full framework is in our rental property management Melbourne guide.

Insurance update. Notify your landlord insurance broker the moment the SSD is rented out under a separate lease — some policies rate dual-living differently, a small number exclude it, and almost all want the secondary dwelling explicitly noted on the schedule.

Talk to OptimaRea early — before the build, not after. The cheapest mistakes to fix are the ones identified at the design stage. Bedroom head positioning for acoustic privacy, separate-entry pathway design, off-street parking layout, sub-meter configuration, and solar orientation are all $0 changes on a draft plan and $20,000+ retrofits after the slab is poured. OptimaRea reviews SSD designs at no cost for any landlord planning to engage us as the post-build manager — email joey@optimarea.com.au or use the enquiry form and ask for Steven directly.