Granny flats in Mt Eliza.

Mornington Peninsula Shire — not Frankston City.

The boundary between Frankston City and Mornington Peninsula Shire runs along Humphries Road / Bentons Road. Mt Eliza sits in the Peninsula Shire, not Frankston City — meaning a different planning scheme, different ResCode application, and different DCPO design controls. Mt Eliza’s Design and Development Overlay (DDO) is one of the stricter ones in the Shire and gives council discretion on height, mass and material choices.

Design integration with the existing home.

Mt Eliza buyers expect a granny flat to architecturally match the main house. Heritage Federation? Match the eave profile, weatherboard width, sash window proportions. Mid-century modern? Match the roof pitch, brick coursing, horizontal lines. We do every Mt Eliza project with a registered architect on the design phase — the few extra thousand at design saves $50K of rework when council asks for elevation changes.

AS 4312 salt-spray zone — all of Mt Eliza.

Essentially all of Mt Eliza is within 3km of Port Phillip Bay and sits in AS 4312 “moderate to severe” salt-spray zone. Standard galvanised fixings will rust through within 8–12 years. We spec 316-grade stainless on all external fasteners, hot-dip-galvanised structural steel, marine-grade silicone sealants, and powder-coated aluminium window framing as the floor for any Mt Eliza build.

Typical Mt Eliza jobs.

• Architecturally-matched 1-bedroom granny flat 50m², custom on-site, $170K–$220K
• 2-bedroom dual-occupancy 100m² on a 1,500m² bay-view block, $230K–$300K
• Heritage-overlay-compliant rear extension/SDA build (additional approval layer)
• Pool-house / garden studio in keeping with existing landscaping, $60K–$120K
• Bayside-view granny flat with full coastal-spec (stainless, marine sealants, elevated subfloor)