CasaDaily

A Casa Intelligence™ platform

Casa Daily Cost Guides

Granny flat cost in Moreton Bay

$170,000–$270,000turn-key 70-90m² Moreton Bay secondary dwelling

Indicative all-in cost for a turn-key 70-90m² Class 1a granny flat (secondary dwelling) in Moreton Bay (Caboolture, Burpengary, Morayfield, Kallangur, Redcliffe corridor): $170,000–$270,000. Moreton Bay permits up to 90m² GFA — the most generous in SEQ — with separate tenancy widely allowed. Yields $400-$600/week — gross marginal yield 9-14%.

Line-by-line cost breakdown

Line itemRangeNotes
Design + draughting$3,000–$8,000Compliant Accepted Development design under Moreton Bay rules.
Building certifier (Building Works approval)$2,000–$4,000No council planning DA required if within Accepted thresholds.
Site prep + slab$18,000–$35,000Site clearance, footings, concrete slab.
Frame + lock-up$60,000–$95,000Frame, roof, windows, external cladding.
Fit-out (kitchen, bathroom, internal)$50,000–$85,000Standard finishes.
Services connection$12,000–$25,000Water, sewer, electrical, NBN. Higher in newer estates due to longer service runs.
Driveway / pathway$4,000–$12,000Optional separate access.
Site costs + contingency$21,000–$38,000Builder's site allowance, slope contingency.
Total$170,000–$270,000turn-key 70-90m² Moreton Bay secondary dwelling

Variables that move the total

  • GFA up to 90m²

    Moreton Bay's 90m² ceiling allows larger 2-bed-plus-study designs that command higher rent.

  • Separate-tenancy permission

    Widely permitted in Moreton Bay residential zones — materially raises yield.

  • Slope

    Hilltop estates (parts of Burpengary East, Narangba) add $15-40K for retaining.

  • Bushfire

    Moreton Bay has significant bushfire-overlay coverage in northern growth corridor; BAL ≥29 adds $15-30K.

  • Premium finishes

    Stone benches, timber floors, ducted air add $20-50K.

What's NOT included in the total

  • Existing dwelling renovations if needed for compliance.
  • Subdivision (community-titling the secondary dwelling off — separate $60-100K play).
  • Owner-occupier inclusions.

Common questions about granny flat cost in moreton bay

Why is Moreton Bay the best SEQ council for granny flats?
Three reasons: 90m² Accepted ceiling (most generous in SEQ — Brisbane is 80m², Logan 70m²); separate tenancy widely permitted in residential zones; reliable rental demand from the growth-corridor commuter base. Combined with cheaper land, marginal yields run 9-14%.
Do I need a DA for a granny flat in Moreton Bay?
No, if your design stays within Moreton Bay's Accepted Development thresholds (≤90m² GFA, complies with setbacks, single secondary dwelling on the lot). Building Works approval through a building certifier is still required for any new dwelling.
What rent will a Moreton Bay granny flat earn?
Indicative $400-$600/week for a 70-90m² 2-bed in growth-corridor suburbs (Caboolture, Burpengary, Morayfield). Higher closer to Redcliffe ($500-$700/wk). Gross marginal yield typically 9-14% on the build cost.

Related

Run this feasibility on a real SEQ listing. First brief tomorrow morning.

Create your account

$500 / mo · or $4,800 / yr (save 20%) · cancel any time

Other cost guides