Multi-residential Class 2 construction in Sydney costs 3,200 to over 6,200 dollars per square metre of gross floor area. Building height is the single largest driver of this range, from low-rise to high-rise. Finish tier moves the cost within each height band, from basic to premium specification.
Basement parking and site access conditions add cost outside the base square metre rate. DBP Act compliance and BASIX certification add administrative and engineering costs on top of construction.
Cost by Building Height
Building height is the single largest driver of Class 2 construction cost per square metre.
Low-Rise Apartments (Under 4 Storeys)
Low-rise apartment buildings cost 3,200 to 3,800 dollars per square metre of gross floor area. Lightweight or hybrid concrete frames and standard fire separation keep the structural cost at the lower end of the range.
Mid-Rise Developments (4 to 8 Storeys)
Mid-rise developments cost 3,800 to 4,500 dollars per square metre. Structural concrete demands, internal lifts, and stricter acoustic and wind loading engineering push the rate above low-rise construction.
High-Rise Construction (8 Storeys and Over)
High-rise construction costs 4,500 to over 6,200 dollars per square metre. Tower cranes, deep foundation piling and advanced mechanical and ventilation systems account for the higher end of the range.
Cost by Finish Tier
Finish tier moves the cost within each height band, separate from the structural cost driven by building height.
| Building Height | Basic Finish | Mid-Range Finish | Premium Finish |
| Low-Rise (3 to 4 levels) | $3,200/m² | $3,500/m² | $3,900+/m² |
| Mid-Rise (4 to 8 levels) | $3,800/m² | $4,150/m² | $4,600+/m² |
| High-Rise (8+ levels) | $4,500/m² | $5,200/m² | $6,200+/m² |
Basic finish covers standard fixtures and fittings across kitchens, bathrooms and common areas. Premium or architectural finish adds bespoke joinery, higher grade surfaces and feature elements throughout the building.
What Adds Cost Beyond the Base Rate
Basement Excavation and Parking
Standard subterranean car spaces cost 25,000 to 45,000 dollars per bay. Shoring adjacent structures in dense metro sites often doubles this line item.
Site Access and Location Premium
Inner Sydney sites attract a 10 to 20 percent premium above greenfield construction. Tight boundary clearances, traffic control plans and restricted material delivery windows drive this premium.
DBP Act Compliance and BASIX Certification
Design and Building Practitioners Act compliance requires extensive structural engineering documentation on every Class 2 project. BASIX energy efficiency certification adds further administrative and professional oversight cost. Our breakdown of DBP Act compliance for multi-residential developers sets out what this obligation covers in full.
Fire Safety Systems
Fire safety compliance under the NCC adds cost through fire separation, sprinkler systems and egress requirements specific to Class 2 buildings. Our guide to fire safety compliance for Class 2 buildings covers what these systems require.
Contingency Allowance
Quantity surveyors recommend an 8 to 15 percent contingency buffer on Class 2 projects. This buffer absorbs subsurface conditions, structural changes and utility connection delays discovered after construction starts.
Confirm Your Project Qualifies as Class 2 Before Budgeting
A Class 2 building contains two or more sole occupancy units under the NCC, and this classification determines which cost drivers above apply.
A single dwelling falls under a different NCC class from Class 2 and carries a different cost structure entirely. Confirm the classification before applying any range above to a specific project. Our guide to Class 2 residential construction sets out how this classification is determined.
Budgeting a Class 2 Construction Project
Building height sets the base rate. Finish tier, site conditions and compliance obligations move the final figure from there.
Tau Constructions delivers Class 2 multi-residential projects under the DBP Act framework with director-led oversight on every build. Our residential construction service outlines how we structure cost planning and compliance together from the outset.
Frequently Asked Questions
Does the per square metre rate include basement parking?
Basement and subterranean parking is priced separately. Subterranean parking costs 25,000 to 45,000 dollars per bay, outside the base construction rate per square metre.
How much does DBP Act compliance add to a Class 2 budget?
DBP Act compliance does not add a fixed percentage. It scales structural engineering and certification cost with building complexity and height instead.
What contingency allowance does a Class 2 project need?
Quantity surveyors recommend a contingency buffer of 8 to 15 percent of the construction budget for a Class 2 project.
