Project Management
Independent coordination of trades, timelines and council requirements — so your granny flat build stays on track and on budget.
Project management at a glance
Fee range
$8,000 to $30,000 depending on fee structure. Fixed fee ($8K–$15K), percentage of build cost (8–15%), or hourly ($80–$150/hr).
What they do
Trade scheduling, quality inspections (6 to 8 during a typical build), council liaison, budget tracking, variation management and defect identification.
Key advantage
Professional oversight without the builder's margin. Good project management typically saves 5 to 10 percent of build cost through waste reduction and issue prevention.
Best suited for
Owner-builders managing a kit or trade-by-trade build, buyers who want independent oversight of their builder, and complex projects with multiple stakeholders.
A granny flat project manager is an independent professional who coordinates your build without being the builder. They schedule trades, manage timelines, oversee quality, liaise with council and track your budget. As of Q1 2026, project management fees range from $8,000 to $30,000 depending on the fee structure and project complexity.
Project management is most valuable for owner-builder projects where you hold the legal responsibility but lack construction management experience. A good PM fills the knowledge gap between owning the permit and actually delivering a compliant, quality build.
The PM is not a builder and does not carry a builder's licence. They act as your representative on site — checking work quality, verifying compliance, managing trade scheduling and flagging problems before they become expensive.
Granny flat builders in Australia
Browse profiles, compare service areas, and check reviews.
Garden Studios
★ 5.0 (63 reviews)
View profile →
Perway Ecopods
★ 5.0 (43 reviews)
Perth-based home renovation and construction company offering custom builds with transparent service.
View profile →
Out-Back Portable Buildings
★ 5.0 (25 reviews)
Custom-made, pre-fabricated transportable homes including granny flats, offices, and portable buildings.
View profile →
Adams Cabins
★ 5.0 (20 reviews)
Family-owned cabin builders specializing in log cabins, granny flats, and tiny homes in SE Queensland.
View profile →
ATN Constructions
★ 5.0 (18 reviews)
View profile →
Dare Constructions
★ 5.0 (16 reviews)
Steel frame construction specialist including granny flats, carports, sheds across Newcastle, Hunter Valley, and Sydney.
View profile →
GrannyFlatGuide is a comparison platform. Companies shown are filtered by relevance to this page. Listing does not imply endorsement. GrannyFlatGuide may receive a referral fee when you request quotes.
What a project manager does
A granny flat project manager handles the logistics that most homeowners are not equipped to manage. Their core responsibilities include scheduling and coordinating trades so work flows without gaps or clashes, conducting quality inspections at critical build stages (slab, frame, lock-up, fit-off, completion), liaising with council and private certifiers for required inspections, tracking the budget against the plan and managing variations, identifying defects before final payment, and coordinating the handover process including the occupation certificate.
Most PMs visit the site 6 to 8 times during a typical granny flat build, with additional visits for complex projects or when issues arise.
Fee structures explained
Fixed fee
$8,000 to $15,000 for the full project. You know the cost upfront regardless of build duration. Best when the scope is well-defined and unlikely to change.
Percentage of build cost
8 to 15 percent of the total construction cost. On a $150,000 build, that is $12,000 to $22,500. Aligns the PM's fee with project complexity but creates a perverse incentive — the PM earns more if costs increase.
Hourly rate
$80 to $150 per hour, typically totalling $10,000 to $20,000 for a standard granny flat project. Best for straightforward builds where you want flexibility to reduce PM involvement as the project progresses.
When you need a project manager
You are building as an owner-builder and have not managed a construction project before. You have purchased a kit and need someone to coordinate trades for assembly and fit-out. You want independent oversight of your turnkey builder — someone checking quality on your behalf. Or your site has complications (slope, access, heritage, multiple council requirements) that need expert coordination.
Project manager vs builder
A builder carries a licence, employs or subcontracts trades, and takes legal responsibility for the construction. A project manager coordinates but does not build. They cannot sign off on construction work or issue warranties.
For most buyers, a turnkey builder is simpler. Project management makes sense when you want to separate construction from oversight, or when you are managing trades directly and need professional support.
Project management fee ranges
Fees depend on the structure chosen and the complexity of the build. All figures are indicative for a standard granny flat project as of Q1 2026.
| Scenario | Cost range (AUD, ex GST) | Notes |
|---|---|---|
| Fixed fee | $8,000–$15,000 | Set price for full project management from slab to handover. Best for well-defined scope. |
| Percentage-based (on $150K build) | $12,000–$22,500 | 8 to 15 percent of total build cost. Fee scales with project complexity and value. |
| Hourly rate | $10,000–$20,000 | Charged at $80 to $150 per hour. Total depends on number of site visits and complexity. |
| Full owner-builder support package | $15,000–$30,000 | Comprehensive PM including trade sourcing, contract review, all inspections and council liaison. |
Ranges based on published fees from independent project managers and building consultants specialising in residential secondary dwellings across NSW, VIC and QLD.
Last checked: 1 April 2026
See if your property qualifies
Your property’s zoning and overlays determine what you can build. Check yours for free.
What can you build on your property?
Enter your address and we'll check your zoning, overlays, and what's possible on your block.
We use your address to check council zoning and planning rules — not stored until you choose to continue.
A granny flat project manager is an independent professional who coordinates your build without being the builder. They schedule trades, manage timelines, oversee quality, liaise with council and track your budget. As of Q1 2026, project management fees range from $8,000 to $30,000 depending on the fee structure and project complexity.
Project management is most valuable for owner-builder projects where you hold the legal responsibility but lack construction management experience. A good PM fills the knowledge gap between owning the permit and actually delivering a compliant, quality build.
The PM is not a builder and does not carry a builder's licence. They act as your representative on site — checking work quality, verifying compliance, managing trade scheduling and flagging problems before they become expensive.
Granny flat builders in Australia
Browse profiles, compare service areas, and check reviews.
Garden Studios
★ 5.0 (63 reviews)
View profile →
Perway Ecopods
★ 5.0 (43 reviews)
Perth-based home renovation and construction company offering custom builds with transparent service.
View profile →
Out-Back Portable Buildings
★ 5.0 (25 reviews)
Custom-made, pre-fabricated transportable homes including granny flats, offices, and portable buildings.
View profile →
Adams Cabins
★ 5.0 (20 reviews)
Family-owned cabin builders specializing in log cabins, granny flats, and tiny homes in SE Queensland.
View profile →
ATN Constructions
★ 5.0 (18 reviews)
View profile →
Dare Constructions
★ 5.0 (16 reviews)
Steel frame construction specialist including granny flats, carports, sheds across Newcastle, Hunter Valley, and Sydney.
View profile →
GrannyFlatGuide is a comparison platform. Companies shown are filtered by relevance to this page. Listing does not imply endorsement. GrannyFlatGuide may receive a referral fee when you request quotes.
What a project manager does
A granny flat project manager handles the logistics that most homeowners are not equipped to manage. Their core responsibilities include scheduling and coordinating trades so work flows without gaps or clashes, conducting quality inspections at critical build stages (slab, frame, lock-up, fit-off, completion), liaising with council and private certifiers for required inspections, tracking the budget against the plan and managing variations, identifying defects before final payment, and coordinating the handover process including the occupation certificate.
Most PMs visit the site 6 to 8 times during a typical granny flat build, with additional visits for complex projects or when issues arise.
Fee structures explained
Fixed fee
$8,000 to $15,000 for the full project. You know the cost upfront regardless of build duration. Best when the scope is well-defined and unlikely to change.
Percentage of build cost
8 to 15 percent of the total construction cost. On a $150,000 build, that is $12,000 to $22,500. Aligns the PM's fee with project complexity but creates a perverse incentive — the PM earns more if costs increase.
Hourly rate
$80 to $150 per hour, typically totalling $10,000 to $20,000 for a standard granny flat project. Best for straightforward builds where you want flexibility to reduce PM involvement as the project progresses.
When you need a project manager
You are building as an owner-builder and have not managed a construction project before. You have purchased a kit and need someone to coordinate trades for assembly and fit-out. You want independent oversight of your turnkey builder — someone checking quality on your behalf. Or your site has complications (slope, access, heritage, multiple council requirements) that need expert coordination.
Project manager vs builder
A builder carries a licence, employs or subcontracts trades, and takes legal responsibility for the construction. A project manager coordinates but does not build. They cannot sign off on construction work or issue warranties.
For most buyers, a turnkey builder is simpler. Project management makes sense when you want to separate construction from oversight, or when you are managing trades directly and need professional support.
Project management fee ranges
Fees depend on the structure chosen and the complexity of the build. All figures are indicative for a standard granny flat project as of Q1 2026.
| Scenario | Cost range (AUD, ex GST) | Notes |
|---|---|---|
| Fixed fee | $8,000–$15,000 | Set price for full project management from slab to handover. Best for well-defined scope. |
| Percentage-based (on $150K build) | $12,000–$22,500 | 8 to 15 percent of total build cost. Fee scales with project complexity and value. |
| Hourly rate | $10,000–$20,000 | Charged at $80 to $150 per hour. Total depends on number of site visits and complexity. |
| Full owner-builder support package | $15,000–$30,000 | Comprehensive PM including trade sourcing, contract review, all inspections and council liaison. |
Ranges based on published fees from independent project managers and building consultants specialising in residential secondary dwellings across NSW, VIC and QLD.
Last checked: 1 April 2026
See if your property qualifies
Your property’s zoning and overlays determine what you can build. Check yours for free.
What can you build on your property?
Enter your address and we'll check your zoning, overlays, and what's possible on your block.
We use your address to check council zoning and planning rules — not stored until you choose to continue.
Related guides
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Cost guide
2 Bedroom Granny Flat Cost — Pricing by Build Type (2026)
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Cost guide
Granny Flat Prices in Australia — Real Builder Pricing Compared (2026)
Compare real granny flat prices across budget prefab, mid-range custom, and premium turnkey tiers. See what the 'from' price includes and what you'll actually pay in 2026.
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