Granny flats in Carrum Downs.
Carrum Downs is mostly 1990s and 2000s estates — 400–700m² blocks, modern slab-on-ground homes, mortgage-belt demographic. Granny flats here are usually the cost-effective modular option, fast-tracked through VicSmart, sized to fit the rear yard without losing the lawn.
The Carrum Downs granny flat story.
Block size dictates the design.
Most Carrum Downs blocks fall in the 450–650m² range. Frankston City still allows one second dwelling per lot ≥300m², but the rear setback, outdoor space requirement, and existing house siting mean a realistic granny flat is 35–50m² for a 1-bedroom. Anything bigger starts eating the main dwelling’s required outdoor area.
Modular is usually the right call.
Carrum Downs streets are narrow, side access is often via a 3m gate or no access at all. Custom on-site build means hand-walking materials through the existing house or carrying over the fence — expensive and risky for the existing landscaping. Factory-built modular craned in from the street is faster, cheaper, and doesn’t trash the lawn. 12–16 weeks from contract to keys.
Cost-conscious doesn’t mean low-spec.
Carrum Downs buyers want value, not budget compromises that cost more later. Our standard Carrum Downs spec includes NCC 2022 / 7-star NatHERS compliance, double-glazed windows, R4 ceiling insulation, ducted reverse-cycle heating/cooling, and induction cooktop. Total: $110K–$140K installed for a 1-bedroom modular. The cheap version skips the ducting and single-glazes — costs you $40/month forever in winter heating.
Typical Carrum Downs jobs.
- 1-bedroom modular 40m², VicSmart fast-track, $115K–$135K all-in
- 2-bedroom modular 70m² (where block size allows), $160K–$190K
- Crane-in delivery from kerbside, 1-day install
- Adult-child accommodation with separate driveway access
- Side-yard demolition + replacement (older 1990s shed cleared)
Other service areas.
Free Carrum Downs design consultation.
Modular crane-in. VicSmart fast-track. Honest cost-vs-value advice.