Construction Cost Estimating in NSW

What Is Construction Cost Estimating?

Construction cost estimating is the process of calculating the anticipated cost of building, renovating, or modifying a structure. In New South Wales, accurate cost estimating is critical for:

• Budgeting — Knowing what your project will cost before committing
• Tendering — Comparing builders' quotes fairly
• DA/CDC applications — Estimated cost is a required field for council approvals
• Home loans — Banks need realistic estimates for finance approval
• Insurance — Builder's risk insurance is typically based on construction value

Estimates in NSW are typically calculated in dollars per square metre ($/m²) for different building types and quality levels.

NSW Cost Drivers (2026)

Construction costs in NSW are influenced by six key factors:

1. Building Class — Class 1 residential vs. Class 2 apartments vs. commercial
2. Location — Sydney CBD vs. Western Sydney vs. regional NSW
3. Construction Type — Brick veneer vs. concrete vs. lightweight
4. Finishes — Standard vs. premium vs. luxury specifications
5. Site Constraints — Slope, access, soil conditions, flood zone
6. Compliance — BASIX 2026 requirements, bushfire, acoustic

Typical NSW Construction Costs (2026)

Indicative rates for standard construction quality in Greater Sydney:

Building Type	$ / m² (Standard)	$ / m² (Premium)
Single storey house	$2,000 – $2,800	$2,800 – $3,500
Two storey house	$2,200 – $3,000	$3,000 – $3,800
Duplex (attached)	$2,400 – $3,200	$3,200 – $4,000
Granny flat (Class 1a)	$2,200 – $3,000	$3,000 – $3,800
Apartment (Class 2)	$3,000 – $4,500	$4,500 – $6,000
Commercial (office/shop)	$2,500 – $4,000	$4,000 – $6,000

Excludes: land, design fees, council fees, utility connections, landscaping, and furniture.

Design & Approval Fees — What to Budget

Beyond construction costs, budget for design and approval fees:

Service	Typical Cost (AUD)
Architectural design fee	$5,000 – $15,000
DA preparation and lodgement	$2,000 – $5,000
BASIX certificate	$300 – $600
NatHERS assessment (Class 2)	$1,500 – $3,000
Structural engineering	$2,000 – $5,000
Landscaping plan	$1,000 – $2,000
Specialist reports (bushfire, flood, geotech)	$1,000 – $3,000 each
CDC (private certifier)	$1,500 – $4,000
Total design/approval fees	$15,000 – $35,000

Frequently Asked Questions About Cost Estimating

How accurate is the Cordell Sum Sure tool?

The tool provides a preliminary estimate within ±25–30% for standard projects. Actual costs depend on your specific site, design, and current market rates.

How much does building design cost vs. construction cost?

Design and approval fees typically range from 5–10% of construction cost for standard residential projects. For a $500,000 build, budget $25,000–$50,000 for design, approvals, and certification.

What's included in the $/m² rate?

Typically includes: site preparation, footings, framing, roofing, brickwork/cladding, insulation, plasterboard, joinery, painting, flooring, kitchen and bathroom fit-out, electrical, plumbing, and basic compliance. Excludes: land, landscaping, driveways, fencing, furniture, and swimming pools.

Do renovation costs differ from new build costs?

Yes. Renovations typically cost 10–20% more per m² than equivalent new builds due to demolition, working around existing conditions, and potential asbestos remediation.

Should I use the Cordell estimate for my DA application?

Yes. Council DA applications require an estimated construction cost. Use the tool for a realistic figure, but note that council may request supporting documentation if the estimate seems unusual.

How do I get a detailed quote from giantA?

Contact us via our online form, email info@giantA.com.au, or call +61 488 880 787. Provide your project address and description — we respond within 24–48 hours with a competitive, itemised quote.