Fire Protection Engineering Design Cost (Commercial Buildings)

What You Need to Know

Fire protection engineering covers the design of sprinkler systems, hydrant and hose reel systems, smoke detection and alarm systems, smoke control and exhaust systems, passive fire separation, and performance-based fire engineering. Every commercial building in Australia needs some combination of these systems, depending on its NCC classification, size, and rise in storeys.

Design fees for a small commercial building under 1,000 sqm typically range from $3,000 to $8,000. Medium projects of 1,000 to 5,000 sqm run $8,000 to $20,000. Large multi-storey buildings over 5,000 sqm cost $20,000 to $50,000+. If the building requires performance-based fire engineering (an Alternative Solution), add $15,000 to $40,000+ on top of the standard design fees.

These are design fees only. They cover drawings, specifications, hydraulic calculations, and equipment schedules. They do not include the cost of fire protection equipment, installation, testing, commissioning, or ongoing maintenance.

• Sprinkler systems are required in buildings with an effective height over 25 metres, or in specific classifications including Class 3 (accommodation) buildings with more than 2 storeys and Class 9a (health care) buildings. Specification E1.5 of the NCC defines the triggers. (NCC 2025 Specification E1.5, AS 2118.1)
• Hydrant systems are required in buildings over 500 sqm total floor area that are Class 5, 6, 7, 8, or 9 buildings. Fire hydrant coverage must reach all parts of the building within the hose lay distances specified in AS 2419.1. (NCC 2025 Part E1, AS 2419.1)
• Smoke detection and alarm systems are required in all Class 2 to 9 buildings. The type of system (smoke detectors, heat detectors, manual call points, EWIS) depends on the building classification, floor area, and rise in storeys. (NCC 2025 Part E2, AS 1670.1)
• Smoke control systems are required in buildings with atriums, underground spaces, or specific classifications. The NCC specifies when mechanical smoke exhaust or pressurisation is needed. (NCC 2025 Part E2, AS 1668.1)
• Fire separation must be maintained at all service penetrations. Every pipe, duct, cable tray, and conduit that passes through a fire-rated wall or floor must be sealed to the same fire resistance level (FRL). (NCC 2025 Part C3, AS 4072.1)
• Performance-based fire engineering requires a Fire Engineering Brief (FEB) and Fire Engineering Report (FER). These must be prepared by a qualified fire engineer and accepted by the relevant authority (typically the certifier and Fire and Rescue NSW). (NCC 2025 Part A2, IFEG Guidelines)
• Annual Fire Safety Statements (AFSS) are required for all commercial buildings in NSW. The building owner must certify annually that all essential fire safety measures are maintained and operational. Design decisions made now affect maintenance obligations for the life of the building. (Environmental Planning and Assessment Regulation 2021)

Fire protection design fees vary widely because the scope changes dramatically between project types. A single-storey retail building under 500 sqm may only need smoke detection and portable extinguishers. The design fee for that scope might be $3,000 to $5,000. A 10-storey commercial office building needs sprinklers, hydrants, detection, EWIS (Emergency Warning and Intercommunication System), stairwell pressurisation, and possibly a smoke exhaust system. That scope runs $30,000 to $50,000+ for design alone.

The number of fire protection sub-disciplines on your project is the primary cost driver. A project that needs only detection and hydrants costs less than one that also needs sprinklers and smoke control. Each system requires its own set of drawings, calculations, and specifications. Sprinkler design includes hydraulic calculations to prove the water supply can deliver the required flow rate and pressure to the most remote sprinkler head. Hydrant design includes similar hydraulic calculations plus pump sizing if the mains pressure is insufficient.

Building classification is the second major cost driver. Class 2 (apartments) and Class 3 (hotels, boarding houses) buildings trigger sprinkler requirements at lower thresholds than Class 5 (offices) or Class 6 (retail). A 3-storey Class 3 building needs sprinklers. A 3-storey Class 5 building may not. This single difference can add $5,000 to $15,000 to the fire protection design fee.

Smoke control is where costs escalate. If the building has an atrium, underground car park, or requires stairwell pressurisation, the smoke control design involves computational fluid dynamics (CFD) modelling or analytical zone modelling. This is specialist work, often subcontracted by the fire protection engineer to a fire dynamics consultant. Smoke control design for a multi-storey atrium can cost $10,000 to $25,000 as a standalone scope.

Performance-based fire engineering (Alternative Solutions) is needed when the building cannot meet the DTS fire safety requirements. Common triggers include open-plan retail with travel distances exceeding DTS limits, heritage buildings where fire separation cannot be installed without destroying original fabric, and mixed-use buildings with unusual configurations. A fire engineering report assesses the risk, models fire scenarios, and proposes alternative measures that achieve the same level of safety as DTS. This work is separate from the standard fire protection design and adds significant cost.

The design deliverables you receive typically include fire sprinkler layout drawings showing head locations and pipe routing, hydrant and hose reel layout drawings, detection and alarm system drawings showing device locations and wiring, smoke control system drawings if applicable, hydraulic calculation reports for sprinkler and hydrant systems, equipment schedules listing every device and its specification, and a written specification covering installation requirements, testing procedures, and performance criteria.

One area that catches builders by surprise is the interaction between fire protection and other services. Sprinkler heads need specific clearances from ceilings, walls, and obstructions. Ductwork, cable trays, and lighting that obstruct sprinkler spray patterns require additional heads or relocated services. This coordination happens during the detailed design phase and affects the ceiling layout, structural framing, and other building services. If coordination is poor, the fire contractor will issue variations on site.