Coastal building materials and home design
Building a new home near the ocean and Australia’s famous Surf Coast means means building in a slightly different environment compared to inland.
Be prepared. Environmentally aware design, smart material choices and builder experience will all help your home stands the test of time.
A/Prof. Nateque Mahmood, Head of Discipline for Construction Management, School of Architecture and Built Environment at Deakin University in Geelong, shares his expertise for building a new home in a coastal area.
Learn more about the Design Guidelines at Ashbury.
Understanding the Environment
“Sustainable coastal design integrates passive cooling, natural ventilation, and locally sourced materials to reduce environmental impact while enhancing liveability. It’s about harmonising with the climate, not fighting it” – A/Prof. Mahmood, School of Architecture and Built Environment
Living in a coastal zone also brings unique stressors: salty sea air, frequent breezes or strong winds, fluctuating temperatures and, for some sites, potential water‑intrusion or soil erosion issues.
Looking south across Armstrong Creek to the Bellarine Peninsula coastline.
Corrosion and Salt‑Air Exposure
“Coastal environments demand materials that can withstand salt-laden air, high humidity, and strong winds,” says A/Prof. Mahmood
“Opting for corrosion-resistant metals like stainless steel or marine-grade aluminium, and durable cladding such as treated timber, can significantly extend the life of a coastal home.”
Building codes such as the National Construction Code (NCC) and relevant Australian Standards require higher‑grade or treated materials for builds near the sea.
The closer you are to surf‑influence or open coastline, the more protection is required.
Salt is the primary culprit: untreated timber, mild steel fixings or low‑grade coatings can be affected.
- Choose cladding & roofing materials rated for coastal salt‑air exposure: treated native timber, brick, COLORBOND® steel.
- Opt for marine‑grade stainless steel fixings; note that brushed or matte stainless may corrode quicker than polished finishes in salt‑air environments.
- Select paints and sealants designed for exterior salt‑air exposure, and pay attention to vulnerable areas (window sills, ledges, ridges).
While these choices often raise upfront costs, the upside is dramatically lower maintenance and better long‑term performance.
Water, Flooding and Moisture Considerations
“Designing for the coast isn’t just about aesthetics—it’s about resilience,” says A/Prof. Mahmood.
“Elevated floor systems, reinforced roofing, and strategic window placement can help homes endure storm surges and cyclonic winds while maintaining comfort and energy efficiency.”
If your coastal site is near the shoreline, estuary or tidal zone, water and moisture intrusion become major design risks.
Consider:
- Elevating habitable floor levels where feasible, to reduce risk of tidal surge, storm‑frame water or flash flooding.
- Using water‑resistant materials at ground and external levels: tiles instead of carpet, composite timber‑look materials instead of natural hardwoods, COLORBOND® steel products for roofs, walls, gutters and fascias.
These strategies reduce the impact of moisture and salt‑water on your home’s structure and systems.
Choose a Builder with Coastal Experience
“Building within 10 km of the coast often involves navigating stricter planning controls and environmental overlays. Early engagement with local councils and coastal engineers is key to ensuring compliance and avoiding costly redesigns” – A/Prof. Mahmood, School of Architecture and Built Environment
Select a builder who:
- Has demonstrable experience in coastal environments and understands the unique construction challenges.
- Maintains strong relationships with vendors and subcontractors who source quality materials suited for your home’s location.
- Offers transparency on materials, design specs and maintenance expectations.
Maintenance Doesn’t End at Handover
A/Prof. Mahmood – “Homes near the coast require a proactive maintenance mindset. Regular inspections, protective coatings, and choosing low-maintenance finishes can reduce long-term costs and preserve structural integrity.”
Even the best‑built coastal home needs continued upkeep.
Key maintenance tasks:
- Regularly clean metal surfaces (remove salt and sand) but be careful not to damage protective coatings.
- Consider professional pressure‑cleaning of exterior walls, doors, windows every six months to remove salt build‑up and protect paint/sealants.
- Inspect sealants annually and reseal when needed, corrosion or damaged coatings spread quickly and become expensive.
- Don’t ignore early signs of rust, peeling paint or weakening fixings: address them immediately rather than letting them worsen.
Thinking of building in Armstrong Creek?
Learn more about the Design Guidelines at Ashbury.
Thank you to A/Prof. Nateque Mahmood, Head of Discipline for Construction Management, School of Architecture and Built Environment at Deakin University in Geelong.
Deakin University’s Geelong Waterfront campus offers a Bachelor of Construction Management (Honours) and Master of Construction Management degrees.