Installed Cost Range
Commercial ductwork spans $10 to $65 per linear foot installed, while complete building scopes range from $3,000 to well over $50,000.
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How much does it cost to install or repair commercial ductwork?
Phoenix Commercial HVAC breaks down the numbers behind commercial ductwork costs so Phoenix property owners can compare scopes before requesting a quote. Installed ductwork can run from $10 to $65 per linear foot, while a full building system may cost $3,000 to well over $50,000 depending on material, square footage, demolition, and access.
Quick Summary
- Phoenix commercial ductwork commonly runs $35 to $65 per linear foot installed, with about $50 per linear foot as a mid-range figure for galvanized sheet metal.
- A single-suite tenant improvement may run $3,000 to $8,000; a full building tied to multiple rooftop units can run $15,000 to $40,000-plus.
- A 1,500-square-foot commercial space typically needs 3 to 4 tons of cooling, putting a complete installed system with ductwork around $12,000 to $18,000.
- Duct material and installation access create the largest price swings; annual preventive maintenance typically runs $0.15 to $0.30 per square foot.
Three Ways Ductwork Costs Change
Material and Access
Spiral steel, rectangular sheet metal, flexible branches, and buried duct carry different fabrication and installation demands. Access through an open shell usually costs less than routing through an occupied building or working around rooftop penetrations.
Itemized Quote Scope
Compare linear footage, insulation R-value, labor, sealing method, and material grade. An itemized proposal should make clear whether the design calls for 26-gauge or 24-gauge sheet metal.
What a Ductwork Estimate Should Show
Spiral and Rectangular Duct Layouts
Round spiral runs in an open commercial area beside rectangular sheet metal fitted above a drop ceiling. The comparison explains why available space and layout affect material choice.
Open-Shell and Occupied-Space Access
Contrast unobstructed installation in an open tenant shell with a crew routing duct above a finished, occupied space. Demolition, tenant protection, roof access, and new penetrations can move the same duct layout into a higher-cost scope.
Static-Pressure and Airflow Testing
Static-pressure measurement, smoke leakage testing at sealed joints, and airflow readings at registers. Testing helps separate a repairable connection from a system losing 20% or more of its conditioned air at the seams.
Commercial Ductwork Cost Snapshot
Lowest-Cost Installation Condition
An open-shell tenant improvement avoids demolition and work around occupants. A single-suite scope commonly runs $3,000 to $8,000.
What Pushes Pricing Higher
Buried duct can reach $60 to $120 per linear foot because of trenching, moisture protection, and burial-rated materials. Commercial kitchen ductwork with makeup air commonly runs $8,000 to $25,000 because exhaust construction and clearances add complexity.
When Repair May Be Enough
A disconnected section, damaged elbow, or crushed flexible run may cost $300 to $1,500 to repair, depending on access. When existing chases and roof penetrations can be reused, replacement may run 60% to 75% of new-install pricing.
What to Avoid in a Quote
Avoid approving one lump sum without material grade, footage, insulation, sealing, and labor details. Properly sized spiral duct with mastic-sealed joints can avoid the 15% to 25% efficiency loss associated with leaky, undersized ductwork.
Duct Material Price Comparison
Phoenix Commercial Ductwork Price Ranges
| Duct type | Typical installed cost | Where the range applies |
|---|---|---|
| Spiral galvanized steel | $40-$65 per linear foot | Rigid commercial runs where pressure class and durability matter. |
| Rectangular sheet metal | $35-$60 per linear foot | Tight plenums and drop-ceiling layouts where round duct will not fit. |
| Flexible branch duct | $10-$25 per linear foot | Short branch runs and takeoffs rather than main trunks. |
| Underground or buried duct | $60-$120 per linear foot | Trenching, burial-rated materials, moisture protection, and permitting coordination. |
What Commercial Ductwork Costs in Phoenix
For many Phoenix projects, galvanized spiral or rectangular duct lands within the common $35-to-$65-per-linear-foot range, while flexible branches cost less and underground work costs more. Another budgeting method is $4 to $9 per square foot of conditioned space for ductwork alone: open floor plans with fewer zones tend toward the lower end, while room-heavy offices with VAV boxes tend toward the higher end. Full commercial installation or replacement may begin around $3,000 for a small tenant space, pass $20,000 for larger buildings with extensive rooftop runs, and exceed $50,000 when the complete system and access demands are substantial.
Factors Behind a Ductwork Estimate
A 1,500-square-foot office suite may carry $6,000 to $10,000 in ductwork alone; when the space needs 3 to 4 tons of cooling at a new-construction benchmark of $4,000 to $4,500 per ton, the complete installed system can reach $12,000 to $18,000. A 5-ton rooftop system with ductwork commonly reaches $20,000 to $22,500, including equipment that may cost $6,000 to $10,000 before labor, ductwork, and curb work, plus $2,000 to $4,000 for labor and crane access. Layout, occupancy, ceiling height, west-facing glass, rooftop penetrations, and plenum temperatures that regularly exceed 140°F all affect design and labor. The process should include an ACCA Manual N load calculation, SMACNA pressure-class duct sizing, mastic-sealed joints, and final Testing, Adjusting, and Balancing; flexible duct use is also limited by code and ASHRAE 90.1 insulation requirements, while kitchen exhaust requires NFPA 96 construction and clearances. Galvanized steel can serve for 20 to 30 years when the material and application are appropriate.
Commercial Ductwork Cost Follow-Up Questions
For a 20-foot run, commercial galvanized duct at $35 to $65 per linear foot comes to $700 to $1,300 installed; a transition, damper, or diffuser connection may add $150 to $400, while flexible branch duct for the same length may run $200 to $500. A 1,200-square-foot house may need $3,000 to $7,000 in ductwork at a residential benchmark of $10 to $30 per linear foot, but that is not a sound comparison for heavier-gauge commercial work. The $5,000 rule multiplies repair cost by equipment age: a $700 repair on an 8-year-old rooftop unit equals $5,600 and points toward considering replacement, though age, refrigerant type, and remaining warranty still matter. Preventive duct and system maintenance typically runs $0.15 to $0.30 per square foot annually and can be 20% to 40% more cost-effective over the system's life than a repair-only approach. Duct cleaning, when needed, typically runs $300 to $500 per unit and may be scheduled every few years in Phoenix's dusty climate.
Plan Your Ductwork Project
Get a Property-Specific Ductwork Estimate
An accurate estimate starts with an on-site review of duct runs, insulation, equipment loads, roof penetrations, and access. Request an itemized scope that separates material grade, linear footage, insulation R-value, and labor before approving the project.