Exhaust systems frequently represent 30 to 50 percent of total renovation cost for food production and chemical processing operations. Understanding what drives these costs allows tenants to scope and budget more accurately before signing a lease.
This guide covers the primary cost drivers for exhaust systems, how to evaluate a specific unit’s exhaust infrastructure during viewings, and how to identify hidden costs within contractor quotes.
Duct length and routing
The distance between the exhaust point and the discharge location is the primary cost driver. More floors between the unit and the roof mean more ductwork, more supports, more bends, and more complexity. Ground-floor units typically offer the shortest and most direct routing to exterior discharge, resulting in lower material and labour costs. External wall routing requires brackets, weatherproofing, and potentially scaffolding for installation and future maintenance access.
Duct material
Material choice significantly affects cost. Galvanised steel is the standard option at approximately $40 to $80 per metre. Stainless steel (required for food production or corrosive environments) costs two to three times more. Fire-rated ductwork adds specialised cost for applications where fire separation is required. Larger diameter ducts need more material and additional support structures, compounding the cost across the full run.
Filtration and treatment systems
Basic grease filters for cooking operations typically cost $200 to $800 per unit. Electrostatic precipitators for more demanding applications range from $5,000 to $20,000 or more. Activated carbon systems for odour control cost approximately $3,000 to $10,000. Scrubbers for chemical or heavy industrial exhaust applications range from $10,000 to $50,000 or higher depending on the process and treatment requirements. The appropriate system depends on the type of exhaust, regulatory requirements, and the sensitivity of surrounding occupiers.
Fan and motor capacity
The fan and motor must match the system requirements: an undersized fan results in ineffective exhaust performance. Larger fans cost more to purchase and consume more electricity during operation. Noise-rated fans prevent neighbour complaints and comply with building rules but carry a premium, typically ranging from $1,500 to $8,000 depending on specifications.
Compliance and approvals
Fire dampers are required at each fire compartment penetration, typically costing $300 to $800 each depending on specification. SCDF submission fees for fire safety review by a Qualified Person range from $3,000 to $10,000 or more depending on project complexity. Building management coordination fees may apply for work affecting common property, rooftop access, or external facades.
Reducing costs in practice
Selecting units with existing exhaust infrastructure reduces first-cost. Lower-floor units reduce duct run length and complexity. Designing the system correctly at the outset avoids expensive modifications mid-renovation. Obtaining multiple contractor quotes for scope exceeding $10,000 allows comparison of pricing and approach. Value engineering (such as routing simplification or selecting appropriate rather than premium-grade components) can reduce cost without compromising compliance.
Summary
Exhaust system cost is driven primarily by duct run length, material selection, filtration requirements, fan capacity, and compliance submissions. Ground-floor food production units with existing exhaust shafts typically offer the lowest-cost path to operation. For new installations in upper-floor units without existing infrastructure, costs can reach $50,000 or more. Scoping the exhaust requirement before lease commitment allows more accurate budgeting and avoids discovering cost constraints after design is underway.
For viewing checks to assess exhaust infrastructure before committing, see the viewing checklist.
For exhaust in the context of overall renovation cost planning, see the renovation cost drivers.
For the full hidden costs picture, see the hidden costs guide.
For zoning and use eligibility before committing to a unit, see the B1 vs B2 zoning guide.
References
[1] NEA — Pollution control and industrial exhaust requirements. https://www.nea.gov.sg/our-services/pollution-control/
[2] SCDF — Fire Code 2023. https://www.scdf.gov.sg/fire-safety-services-listing/fire-code-2023/table-of-content
[3] BCA — Building Control. https://www1.bca.gov.sg/safety-and-standards/building-control-act/
[4] URA — Development Control guidelines. https://www.ura.gov.sg/Corporate/Guidelines/Development-Control
[5] JTC — Industrial building standards. https://www.jtc.gov.sg/find-space/
[6] WSH — Workplace safety and health. https://www.wshc.gov.sg/