2026 Comparison
Granny Flat vs House Extension — Rescon Builders vs Granny Flat Solutions
Compare an Adelaide builder offering renovation and extension options alongside new builds with Sydney’s largest dedicated granny flat builder to help decide between a separate granny flat or extending your main home.
Winner
Rescon Builders
Best overall option once average cost, coverage, and support reputation are weighed together.
Average Gap
$56,750
Difference in average pricing across overlapping granny flat services.
Market Range
$38,000 – $300,000
The full low-to-high range across both providers.
Rescon Builders
Adelaide, SA · Est. 2008
From
$38,000
Average
$92,750
Coverage
5 areas
Best for: Adelaide homeowners wanting flexibility between custom and kit builds at competitive South Australian pricing.
Granny Flat Solutions
Sydney, NSW · Est. 2009
From
$58,000
Average
$149,500
Coverage
5 areas
Best for: Sydney and NSW homeowners wanting a proven, established builder with end-to-end project management and strong council approval expertise.
Side-by-Side Price Comparison
Compare overlapping service types directly so the right price anchor is clear before you request quotes.
| Service | Rescon Builders | Granny Flat Solutions | Difference |
|---|---|---|---|
| 1-Bedroom Granny Flat (40m²) | $96,000 | $118,000 | -$22,000 |
| Kit/Prefab Granny Flat (1-bed) | $64,000 | N/A | - |
| 2-Bedroom Granny Flat (60m²) | $145,000 | $172,000 | -$27,000 |
| Granny Flat Renovation/Extension | $66,000 | N/A | - |
| Studio Granny Flat (25m²) | N/A | $76,000 | - |
| Custom-Designed Granny Flat | N/A | $232,000 | - |
Pros & Cons
Rescon Builders
WinnerPros
- ✓Flexible approach offering both custom and kit options
- ✓Competitive Adelaide pricing — among the most affordable of major cities
- ✓Good understanding of SA Planning and Design Code requirements
- ✓Strong renovation and extension capability
Cons
- ✗Smaller operation than eastern state specialists
- ✗Limited regional SA coverage outside Adelaide metro
Granny Flat Solutions
Pros
- ✓Australia’s largest specialist GF builder with proven track record
- ✓Full turnkey service from CDC/DA through to handover
- ✓Wide range of standard and custom designs
- ✓Strong understanding of NSW council requirements
Cons
- ✗Premium pricing compared to smaller local builders
- ✗Limited to NSW — not available in other states
Bottom Line
Verdict
Rescon Builders offers excellent flexibility for homeowners considering both renovation/extension and new granny flat builds in Adelaide, while Granny Flat Solutions is the clear leader for dedicated new granny flat construction in NSW.
Choose Rescon Builders if you’re weighing up a granny flat versus extending your main home — they can advise on both approaches. Choose Granny Flat Solutions if you’ve decided on a standalone granny flat in NSW and want Australia’s most experienced dedicated builder.
Comparison FAQ
Rescon Builders is cheaper on average in this comparison, but the real answer depends on whether you need a kit/prefab build, custom design, accessible modification, or renovation. Build type, size, site conditions, and finish level affect the final price more than builder alone.
Build size, finish level, site preparation requirements, council approval pathway, and services connection usually affect the total cost more than a blended average across all services. Always compare quotes on the same full scope from slab to handover.
Choose Rescon Builders if you’re weighing up a granny flat versus extending your main home — they can advise on both approaches. Choose Granny Flat Solutions if you’ve decided on a standalone granny flat in NSW and want Australia’s most experienced dedicated builder.