Granny flats in Seaford.

The salt-zone line runs through Seaford.

The AS 4312 moderate-to-severe salt-spray zone extends roughly 3km inland from Port Phillip Bay. For Seaford, that line runs east of Nepean Highway — meaning blocks west of the railway and Nepean Highway need coastal spec (stainless fittings, marine-grade sealants, hot-dip-galvanised steel) while blocks east of the railway are typically inland-spec. We do an AS 4312 distance check at site visit.

Older block, older services.

A lot of Seaford’s housing stock is 1950s and 1960s — meaning the existing services (water main, sewer connection, electrical switchboard) are often undersized for a second dwelling. We do a services audit at the design stage so the $5,000–$15,000 cost of upgrading switchboard, sub-board, and sewer junction is in the fixed quote, not a surprise at construction.

Rental income market.

Seaford rental yields are healthy — 1-bedroom self-contained units in Seaford rent for $400–$520/week long-term, which makes a $130K modular granny flat pay back in 6–8 years before considering capital gain. We design Seaford granny flats with the “future tenant” spec in mind — full kitchen, separate laundry, separate entry, separately-metered electricity and water where possible.

Typical Seaford jobs.

• 1-bedroom 45m² modular for long-term rental, $120K–$155K coastal-spec
• Adult-child accommodation with separate-meter rental option later
• Garden studio with optional bathroom (future-rental-flexible), $50K–$85K
• Switchboard upgrade + sub-board install (older Seaford property baseline)
• Coastal-spec inspection package (post-build certification)