How much does a 2-bedroom granny flat cost in Adelaide?

Turn-key 2-bedroom detached builds (55-70m²) run $180,000-$260,000 in metro Adelaide 2026. Add $30k-$50k for hills sites, heritage overlays or premium finishes.

Is it cheaper to build a granny flat or a home extension?

Usually cheaper to build a granny flat. A ground-floor extension of the same 60m² costs $220,000-$320,000 because you're modifying existing structure, roofline and services. A detached granny flat starts fresh with standard build efficiencies. Extension wins if you want integrated indoor space rather than separate accommodation.

What are the SA council fees for a granny flat?

Total council + PlanSA fees typically $1,800-$4,500 for a Class 1 granny flat. Breakdown: Planning Consent ($200-$500), Building Rules Consent ($521 minimum or 0.25% of build cost), Certificate of Occupancy inspection, and any council-specific service connection fees.

Can I get a granny flat for under $100k in Adelaide?

Only as a studio-format modular kit on a flat metro block with the very cheapest finishes and no significant site works. Realistic 1-bedroom builds start at $120k turn-key. Under $100k usually means significant items excluded.

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Adelaide Granny Flat 2026

Granny Flat Cost Adelaide

Name: BuildPilot Adelaide Building Industry Dataset
Creator: BuildPilot
License: https://buildpilot.com.au/terms

Real 2026 pricing by size, spec and site — plus the 4 line items that quietly swing budgets by $40k+ before you've read the second page of the contract.

Match me with a granny flat builder 1300 885 919

By George Giannakakis · B.Arch.Studies · M.Arch (UniSA) · RLA300580

Last reviewed: 28 February 2026 · How we research

Granny flat pricing in Adelaide is one of the least transparent building categories. Advertised prices routinely exclude site cost, service connections, driveway access and council fees. This page breaks the real all-in cost down by size, spec and site, and calls out the specific line items where quotes diverge by $30k-$60k on the same nominal build.

All-in cost by size (turn-key, Adelaide 2026)

These are turn-key figures assuming a flat metro site, standard finishes and typical service connections. Add 15-30% for hills sites, heritage overlays or premium finishes.

Studio (25-35m²) — $85,000-$130,000
1-bedroom (40-50m²) — $120,000-$180,000
2-bedroom (55-70m²) — $180,000-$260,000
2-bedroom + separate laundry (70m² max) — $220,000-$290,000
Adaptable / accessible design premium — add $15,000-$35,000

The four hidden cost drivers

Every Adelaide granny flat quote hides these four line items in different ways. Get them all itemised before signing.

Site works — reactive clay in Modbury/Salisbury adds $8k-$18k for deeper piering; sloping Hills lots add $12k-$30k for retaining and split-level foundations
Service connections — water, sewer, power and stormwater from the main dwelling to the granny flat cost $6k-$15k; longer runs (rear-of-lot builds) push to $18k-$25k
Heritage / character overlay design — Prospect, Burnside, Charles Sturt inner suburbs routinely add $8k-$20k for streetscape-compliant design and heritage impact statements
Driveway or vehicle access — many SA councils require a separate driveway or defined parking for the ancillary dwelling; add $4k-$12k for a compliant concrete or pavior driveway

Modular vs on-site build

Modular granny flats (built in a factory, craned into place) run 12-25% cheaper and 30-50% faster on-site than traditional on-site builds. Trade-offs: limited design flexibility, standard finishes only, and access constraints for tight blocks or narrow driveways. On-site builds win on flexibility and heritage-area compliance; modular wins on speed and cost.

What "turn-key" means (and doesn't)

Real turn-key = fully liveable: kitchen, bathroom, floor coverings, blinds, driveway, landscaping, letterbox, service connections, Certificate of Occupancy. Half the market quotes "fixed price" but excludes 3-4 of those items. Always ask each builder to include the full inclusions PDF and cross-check line-by-line before comparing quotes.

Frequently asked questions

A studio-format modular kit on a flat metro block with standard finishes: $85,000-$110,000 turn-key. Anything advertised below $80k almost always excludes site cost, service connections or council fees — expect the real all-in to land 30-40% higher.

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Disclaimer: Pricing ranges are based on Feb 2026 Adelaide market observations and are indicative only. Actual costs depend on site conditions, block access, materials and finish level. BuildPilot is an independent home-build CoPilot and does not build or supply. Always obtain three fixed-price quotes on identical inclusions, verify SA building licences via Consumer & Business Services SA and lodge council approvals via PlanSA.

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