A well-planned granny flat or second dwelling can transform how a Dromana block works for your family, whether you are housing ageing parents, creating a teen retreat, or adding a self-contained space for guests. Getting the planning, siting and construction right from the start is what separates a comfortable, compliant home from an expensive headache.
What counts as a granny flat or second dwelling?
In Victoria the terms get used loosely, so it helps to be precise. A “granny flat” usually means a small, self-contained dwelling on the same lot as an existing house, complete with its own kitchen, bathroom and living space. A “second dwelling” or dual occupancy is broader and can include a fully independent home intended for family or, in some cases, rental.
Victoria introduced a Small Second Dwelling planning provision that can make approval more straightforward for a compact secondary home up to a defined floor area, provided it meets the criteria. Whether your project fits that pathway or needs a full planning permit depends on your zone, block size and overlays, so it is worth confirming early with Mornington Peninsula Shire Council.
Planning and permits on the Peninsula
Most Dromana properties sit within residential or low-density zones, and many carry overlays that shape what you can build. Common ones to check include the Bushfire Management Overlay, the Significant Landscape Overlay near Arthurs Seat, and design or vegetation controls closer to the bay.
Two separate approvals typically come into play:
- Planning permit — assessed by the Shire against the planning scheme, covering siting, overlays, neighbourhood character and vegetation.
- Building permit — issued by a registered building surveyor, confirming the design meets the National Construction Code.
Not every small second dwelling triggers a planning permit, but nearly all require a building permit. If your block falls within a designated bushfire area, a Bushfire Attack Level (BAL) assessment will set construction requirements, and blocks near the foreshore may face additional coastal and vegetation considerations.
Siting on a Dromana block
Dromana’s topography is a defining feature. Many blocks slope down towards Port Phillip Bay or rise towards the hills, and that gradient influences everything from stormwater to how much you spend on footings.
A few siting factors reward early attention:
- Slope and cut-and-fill — steeper sites may need a suspended slab or stumps, which adds cost but can unlock views.
- Setbacks and overshadowing — the second dwelling must respect boundary distances and avoid overshadowing neighbouring open space.
- Private open space — both the existing home and the new dwelling generally need their own useable outdoor area.
- Access and parking — the Shire will want to see practical vehicle access and, usually, an additional car space.
- Services — connecting water, power, sewer and NBN to a second building is easier when it sits sensibly relative to existing infrastructure.
Coastal exposure matters too. Salt-laden air and coastal winds are hard on cheaper materials, so specifying corrosion-resistant fixings, quality windows and durable cladding pays off over the life of the building.
Design that earns its keep
Small dwellings live or die on their layout. Because floor area is limited, every metre needs to work, and good design feels far larger than the plans suggest. Open-plan living, generous glazing to the north, and clever storage make a compact home genuinely liveable.
If the dwelling is intended for ageing parents, consider accessibility from day one: level entries, wider doorways, a step-free bathroom and lever tapware. These details cost little to include during construction and are expensive to retrofit later.
Energy performance is not optional. New dwellings in Victoria must meet a 7-star NatHERS energy rating, which shapes orientation, insulation, glazing and shading. A well-oriented granny flat in Dromana’s climate stays cosy in winter and comfortable through summer with minimal heating and cooling — a real saving given it may run as a separate household.
Budgeting realistically
Costs vary widely depending on size, finishes, slope and site access, so treat any figure as a rough guide only. A modest, single-storey second dwelling on a flat, easily serviced block sits at the lower end, while a larger design on a sloping site with premium finishes climbs considerably.
Line items that often surprise owners include site works on sloping blocks, service connections, bushfire construction requirements, and landscaping to satisfy planning conditions. Building on the coast, where salt air demands better materials, can also nudge the budget up. A transparent, fixed-price domestic building contract helps you avoid nasty surprises partway through.
Choosing the right builder
Second dwellings involve the same regulatory rigour as any new home. In Victoria your builder must be a registered building practitioner with the Victorian Building Authority, hold the required domestic building insurance, and work under a compliant contract for projects above the relevant threshold.
Local knowledge is a genuine advantage. A Dromana builder who understands the Shire’s planning expectations, the local soil and slope conditions, and how coastal weather behaves will steer you around common pitfalls. As a local builder based in Dromana, DARC Building Group works across secondary dwellings, extensions and full new homes, and can talk through what your specific block will allow. You can see the range of work on our services page and browse completed builds in our projects gallery.
If you are still weighing up the area itself, our guide to building in Dromana covers the neighbourhood, nearby suburbs such as Safety Beach, McCrae and Rosebud, and what makes this stretch of the Peninsula so liveable.
A second dwelling is one of the most practical ways to add flexibility and value to your property. If you are considering a granny flat or second home in Dromana, get in touch for a straightforward chat about your block, your budget and what is achievable.
Frequently Asked Questions
Do I need a planning permit for a granny flat in Dromana?
It depends on your zone, block size and any overlays. Victoria’s Small Second Dwelling provisions can allow a compact secondary home without a full planning permit in some cases, but many Dromana blocks carry bushfire, landscape or vegetation overlays that change the requirements. Almost all second dwellings still need a building permit from a registered building surveyor, so check with Mornington Peninsula Shire Council early.
How big can a second dwelling be?
Under Victoria’s small second dwelling pathway there is a floor area limit for the simplified approval, and going beyond it generally means a standard planning permit assessment. The maximum practical size also depends on your block, setbacks, private open space and overshadowing rules. A local builder or town planner can quickly confirm what your specific site allows.
Can I rent out a granny flat on my Dromana property?
Whether a second dwelling can be rented depends on the planning approval it was built under, as some pathways are intended for family use rather than separate tenancies. Renting may also trigger additional requirements around services, parking and compliance. Confirm your intended use with the Shire before you build so the approval matches how you plan to use the dwelling.
How long does it take to build a second dwelling?
As a rough guide, construction of a modest single-storey second dwelling often takes several months once permits are in hand, though sloping sites, coastal construction and custom finishes extend that timeline. The approval stage before construction can also take some weeks to months depending on whether a planning permit is required. Building early buffer into your plans for design, permits and any overlay assessments.