Guides
Commercial Ductwork Pricing per Square Foot and Cost Drivers
Commercial ductwork pricing per square foot for US fit-outs, how per-ton and lump-sum quotes differ, and the labor, routing and insulation costs that drive it.
What to take away
- Commercial ductwork pricing is quoted three ways: per square foot of conditioned area, per ton of cooling, or a lump sum per system from a drawing takeoff.
- Most US commercial fit-outs fall in a $6 to $18 per square foot band, with labs, surgical suites and cleanrooms far above it.
- Loaded labor, not galvanized sheet metal, is the largest line on most commercial bids.
- Design-build delivery carries estimating and coordination markup that bid-build work does not.
How Commercial Ductwork Pricing Is Quoted
Three quoting methods cover almost every commercial job. Each answers a different question, and mixing them is how bids get lost.
Three Ductwork Quoting Methods
Per square foot
- Typical basis
- Conditioned floor area
- Best used when
- Early budgets, tenant shells
- What it hides
- Ceiling height, routing
- Time to produce
- Fast
Per ton
- Typical basis
- Installed cooling capacity
- Best used when
- Mechanical-only, design-build
- What it hides
- Duct length
- Time to produce
- Fast
Lump sum per system
- Typical basis
- Drawing takeoff
- Best used when
- Bid-build, complete plans
- What it hides
- Nothing
- Time to produce
- Longest
Typical basis
- Per square foot
- Conditioned floor area
- Per ton
- Installed cooling capacity
- Lump sum per system
- Drawing takeoff
Best used when
- Per square foot
- Early budgets and tenant shells
- Per ton
- Mechanical-only and design-build scopes
- Lump sum per system
- Bid-build with complete plans
A per ton figure hides duct length. A per square foot figure hides ceiling height and routing. Lump sum hides nothing, which is why it takes the longest to produce.
This guide gives the per square foot bands, because that is the figure owners and tenants compare first. A per ton number is only meaningful once the load calculation has fixed the capacity, and a lump sum only once the drawings are complete, so both are worked from the specific job rather than from a published range.
Commercial HVAC Ductwork Cost Per Square Foot
Low-rise office fit-outs in most US metros quote in a $6 to $10 per square foot band. Retail and multifamily corridor work often runs lower because runs are short and simple.
Laboratory, surgical and cleanroom ductwork climbs well past that. Welded stainless, heavier gauge, pressure testing and filtration hardware all enter the bid together.
Height matters too. A 12 foot ceiling with exposed structure costs less than a 9 foot ceiling packed with sprinkler mains and cable trays.
Routing around structure and the count of fire dampers move the number more than total floor area does.
Ductwork Bid Pricing for Commercial Jobs
A commercial bid is built in a fixed order. Skipping a step and doubling back costs more time than the step itself.
How a Commercial Ductwork Bid Is Built
- Perform takeoff by duct size and gauge
- Price material at current coil and galvanized rates
- Apply labor hours from published estimating manual
- Add supervision, permits, testing, balancing, overhead, profit
Most estimating manuals trace their labor units back to the SMACNA HVAC Duct Construction Standards, Metal and Flexible, which set gauge, reinforcement and joint requirements by pressure class. That is why gauge and joint type change the number so much on the same drawing set.
Loaded labor rates start from published wage data. The BLS occupational outlook for HVAC mechanics and installers is the common first stop for those figures.
Design-Build Markups and Tenant Improvement Ductwork Cost
Tenant improvement ductwork is priced against a shell the contractor did not design. That uncertainty is what the design-build markup pays for, usually eight to twenty percent above a straight bid-build number.
Landlord scope, existing shaft space, plenum return allowances and sprinkler clearances all get resolved during design. Each is a change order waiting to happen on a bid-build job.
Example: A Tenant Fit-Out Budget Walk
Take a 12,000 square foot floor in a suburban office building. The mechanical scope is rooftop units already set, with all interior distribution still open.
Ductwork distribution, insulation, hangers and diffusers typically account for roughly one third of the mechanical budget on a fit-out of this size, with the remainder going to equipment, controls and balancing.
That split is why value engineering attacks duct routing before it attacks equipment.
Where the Money Goes Beyond Sheet Metal
Insulation is the second largest material line. Material standards govern what specifiers accept, and ASTM publishes ongoing work on duct insulation materials, including ASTM C1071, the standard specification for fibrous glass duct lining insulation, that shapes what a compliant system costs.
Code requirements set minimums as well. Most US jurisdictions build their mechanical rules on the International Mechanical Code, with local amendments. NFPA 90A covers air conditioning and ventilating system installation and insulation, and inspectors check it on commercial permits.
Sealing, hanger spacing, access panels and testing add cost that drawings rarely show in full.
Residential Pricing Is a Separate Market
Residential prices are a separate market, not US commercial benchmarks. The Ontario reference covers detached homes in Toronto, Ottawa or Hamilton: Ductwork installation cost in Ontario runs from $7,000 to $15,000 before taxes and rebates.
The Alberta reference is also for residential work, not commercial projects: HVAC ductwork pricing in Alberta runs from about $2,800 to $18,000 for a typical house, based on Calgary and Edmonton quotes.
Residential retrofit issues are another separate scope. Rust in ductwork replacement cost is often hidden until a season of high bills or visible staining forces the question; it is not a commercial ductwork rate.
