How Much Does a Granny Flat Cost in Sydney in 2026?
A granny flat in Sydney costs $130,000 to $250,000+ depending on size, spec level, and site conditions. Based on Rawlinson Australian Construction Handbook data adjusted for 2026 Sydney, and Buildana's (Lic. 487805C) experience building granny flats across Fairfield, Liverpool, Cumberland and Canterbury-Bankstown, here is a detailed breakdown.
Construction Cost by Size and Spec
Rawlinson construction rates for granny flats (classified as secondary dwellings) adjusted for 2026 Sydney:
• Studio/1-bed (35–40 sqm), medium brick veneer: $2,195–$2,370/sqm = $76,825–$94,800 • 1-bed (45–50 sqm), medium brick veneer: $2,195–$2,370/sqm = $98,775–$118,500 • 2-bed (55–60 sqm), medium brick veneer: $2,195–$2,370/sqm = $120,725–$142,200 • 2-bed (60 sqm), high brick veneer: $3,075–$3,315/sqm = $184,500–$198,900
Note: Granny flats have a higher effective per-sqm cost than larger homes because fixed costs (kitchen, bathroom, connections) are spread across less floor area.
Additional Costs Beyond Construction
Site preparation: $3,000–$10,000 Service connections (sewer, stormwater, electrical, water): $15,000–$30,000 Approval costs (CDC + BASIX + geotech + survey): $5,000–$11,000 External works (path, fencing, landscaping): $8,000–$23,000
Total additional costs: $30,000–$74,000. All-in total for a 60 sqm 2-bed granny flat, medium spec: $150,000–$220,000.
The single biggest variable is sewer connection distance. If the sewer main is adjacent — $5,000. If it requires a 20m+ extension through rock — $15,000–$25,000. Buildana assesses sewer location at the free site inspection. For the complete granny flat building guide, see our comprehensive guide to building a granny flat in Sydney.
