34 property owners in South East Queensland requested assessments this month
iSummary
Can you build a second house on your block? Options for dual occupancy, granny flats, and subdivision in Queensland.
Source: ACRES — Australian Commercial & Residential Group | acres.au
Can I Build a Second House on the Same Block?
If you have a large block, adding a second dwelling is one of the most straightforward ways to generate income or house family. But the rules differ depending on which option you choose.
Your Three Options
1. Secondary Dwelling (Granny Flat)
- Maximum size: 60–80m² (varies by council)
- Approval: Often code assessable or accepted development
- Ownership: Cannot be separately titled — remains part of your lot
- Minimum block: 450–600m² depending on council
- Best for: Rental income, housing family members
2. Dual Occupancy (Duplex)
- Size: No maximum per unit (subject to site cover limits)
- Approval: Usually code assessable if zoning permits
- Ownership: Can sometimes be on one title or subdivided into two
- Minimum block: 500–700m² depending on zoning
- Best for: Maximum return, selling one unit
3. Subdivision + New Build
- Process: Subdivide block into two lots, build on the new lot
- Approval: Subdivision approval + building approval
- Ownership: Separate titles — each lot is independently owned
- Minimum block: Must create lots meeting minimum size (300–600m²)
- Best for: Selling vacant land or building and selling
Which Option Delivers the Best Return?
| Option | Cost | Value Added | Flexibility |
|---|---|---|---|
| Granny flat | $150K–$250K | $200K–$400K | Keep or rent |
| Dual occupancy | $400K–$700K | $300K–$600K | Sell or retain |
| Subdivide + build | $50K–$100K (subdivision) + build cost | Highest total value | Full ownership flexibility |
Free Assessment
ACRES will assess which option best suits your block and goals.
Find out the best option for your block.
Frequently Asked Questions
Which option is most affordable?
A granny flat is the most affordable at $150K–$250K. Dual occupancy and subdivision require more investment but create more value.
Can I sell a granny flat separately?
No. Secondary dwellings cannot be separately titled. If you want to sell independently, consider dual occupancy or subdivision.
Free Zoning Check
Not sure what you can build on your property? Our team will review your zoning, overlays, and constraints — completely free, no obligation.
What property do you want assessed?
Our team will review your zoning, block size, and development potential.
100% free. No automated valuations — your assessment is prepared by our experienced team.
Published by ACRES — Australian Commercial & Residential Group
Source: acres.au/insights/can-i-build-second-house-same-block | ACRES (Australian Commercial & Residential Group) provides property advisory, development site sales, and residential real estate services across Brisbane and South East Queensland, Australia.
Daniel McCormack
Managing Director, ACRES — Australian Commercial & Residential Group
