2026 Comparison
1-Bedroom vs 2-Bedroom Granny Flat — Backyard Grannys vs Classic Granny Flats
Compare a QLD compliance specialist offering 1-bed and accessible builds with a WA turnkey builder offering 1-bed and 2-bed packages to understand the cost-value tradeoff between sizes.
Winner
Backyard Grannys
Best overall option once average cost, coverage, and support reputation are weighed together.
Average Gap
$25,250
Difference in average pricing across overlapping granny flat services.
Market Range
$4,800 – $270,000
The full low-to-high range across both providers.
Backyard Grannys
Brisbane, QLD · Est. 2014
From
$4,800
Average
$97,250
Coverage
5 areas
Best for: Brisbane and SEQ homeowners wanting a local specialist who understands Queensland council requirements, flood zones, and subtropical design.
Classic Granny Flats
Perth, WA · Est. 2011
From
$13,500
Average
$122,500
Coverage
5 areas
Best for: Perth and WA homeowners wanting a reliable turnkey builder with competitive pricing and strong local knowledge of WA planning requirements.
Side-by-Side Price Comparison
Compare overlapping service types directly so the right price anchor is clear before you request quotes.
| Service | Backyard Grannys | Classic Granny Flats | Difference |
|---|---|---|---|
| 1-Bedroom Granny Flat (40m²) | $100,000 | $104,000 | -$4,000 |
| 2-Bedroom Granny Flat (60m²) | $150,000 | $154,000 | -$4,000 |
| Disability-Accessible Granny Flat | $130,000 | N/A | - |
| Council Approval & Planning | $9,000 | N/A | - |
| Custom-Designed Granny Flat | N/A | $210,000 | - |
| Site Preparation & Slab | N/A | $22,000 | - |
Pros & Cons
Backyard Grannys
WinnerPros
- ✓Deep expertise in QLD council compliance and flood overlay requirements
- ✓Specialist subtropical designs with covered outdoor living
- ✓Experienced with raised-floor (stump) construction for sloping sites
- ✓Strong local reputation across South-East Queensland
Cons
- ✗Limited to Queensland — not available in other states
- ✗Smaller operation means longer wait times in peak season
Classic Granny Flats
Pros
- ✓Strong turnkey design-to-build offering for Perth metro
- ✓Competitive pricing with transparent quoting
- ✓Good understanding of WA ancillary dwelling requirements
- ✓Range of standard and custom design options
Cons
- ✗Limited to WA — not available in other states
- ✗Custom designs take longer — allow extra lead time
Bottom Line
Verdict
Backyard Grannys offers excellent value for 1-bedroom and accessible builds in Queensland with deep local compliance expertise, while Classic Granny Flats provides competitive turnkey 2-bedroom packages in Western Australia.
Choose Backyard Grannys for a 1-bedroom or accessible build in Queensland with expert flood overlay and council compliance. Choose Classic Granny Flats for a turnkey 2-bedroom build in Perth with competitive pricing and strong project management.
Comparison FAQ
Backyard Grannys 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 Backyard Grannys for a 1-bedroom or accessible build in Queensland with expert flood overlay and council compliance. Choose Classic Granny Flats for a turnkey 2-bedroom build in Perth with competitive pricing and strong project management.