What size block do I need for double storey?

Double storey works well on blocks as narrow as 10-12 metres. Many builders have designs specifically for narrow lots. Single storey typically needs 14m+ width for a practical layout.

Which has better resale value?

Both can have strong resale value if well-designed. Double storey often appeals to families wanting space and separation. Single storey appeals to downsizers and those wanting easier living. Location matters more than storeys.

Decision Guide

Single Storey vs Double Storey

Which home style suits you?

Your choice between single and double storey affects everything from cost to lifestyle to resale value. There's no universally right answer. It depends on your block, budget, family, and preferences.

Single Storey

Pros

Generally cheaper to build per square metre
Easier to live in long-term (no stairs)
Better suited for young families and elderly
Simpler construction with fewer complications
Easier and cheaper to maintain
Better indoor-outdoor flow potential
No noise transfer between floors
Faster to build typically

Cons

Requires larger block footprint
Less privacy from neighbours
No separation between living and sleeping zones
May not suit narrow blocks
Larger roof and slab area (higher costs for these)
Less impressive street presence in some designs
Views limited to ground level
Can sprawl if not designed well

Best For

• Larger blocks (450sqm+)
• Families with young children
• Buyers planning to age in place
• Those wanting easier maintenance
• People preferring all living on one level

Double Storey

Pros

More home on less land
Better suited for narrow blocks
Separation between living and sleeping zones
Potential for views from upper level
Often more impressive street presence
Better privacy on upper floor
Smaller roof and slab area
Can be more cost-effective on expensive land

Cons

10-20% more expensive per sqm to build
Stairs can be challenging for some
Noise transfer between floors
Upper floor can be hot in summer
More complex construction
Scaffolding adds to costs
Longer build time typically
May require structural upgrades to slab

Best For

• Narrow blocks (under 14m wide)
• Expensive land where footprint matters
• Teenagers wanting bedroom separation
• Blocks with view potential
• Those wanting impressive facades

Cost Comparison

Common Questions

Single storey is typically cheaper per square metre (10-20% less). However, if land is expensive and you need more space, double storey can be more cost-effective overall because you're using less land footprint.

Sources

Last verified June 2026

ABS Building Activity, Australia (June 2026 quarter). National average floor area and build-cost context used to compare single vs double-storey cost per m². link
National Construction Code (NCC), ABCB (2022). Energy-efficiency (7-star NatHERS), stair and fire-separation requirements that affect two-storey design. link
Housing Industry Association (HIA) (2026). New-home build-cost commentary and the premium for upper-floor framing, stairs and access. link

Cost ranges are planning estimates cross-checked against the sources above, not quotes. Prices move with materials, labour, site conditions and council rules. Always confirm against a written, fixed-price quote for your own block.