Prices estimated using the NailThePrice Local Cost Model™ — national averages adjusted for St. Louis's labor rates, cost of living, and material pricing.
The cost to install ductwork in St. Louis ranges from $1,890 to $7,570, with most homeowners paying around $3,780. Your actual cost depends on several factors specific to your home and the St. Louis market.
Ductwork is priced per linear foot including fittings — more duct runs to more rooms means proportionally higher costs.
Sheet metal ducts last longest and flow air best but cost the most. Flex duct is cheaper but can restrict airflow if not installed properly.
Each supply and return vent needs a boot, register, and connection to the trunk line, adding $75–$200 per vent.
Accessible attics and crawlspaces make duct installation much easier. Tight spaces or inaccessible areas increase labor significantly.
Ducts in unconditioned spaces (attics, crawlspaces) must be insulated to prevent energy loss — insulated duct or wrap adds $2–$5 per linear foot.
The Midwest has a strong pool of skilled tradespeople, and labor rates tend to be moderate compared to coastal cities. Union and non-union shops both compete, giving homeowners options on pricing.
Budget $69–$276 for permits and inspections. Your contractor typically handles the permit process, but confirm this upfront.
Heating efficiency matters more in cold climates. High-efficiency units (95%+ AFUE for furnaces) cost more upfront but save significantly on heating bills over time. Heat pump systems may need supplemental heating below 0°F.
While possible for experienced homeowners, ductwork installation involves significant complexity. In St. Louis, you may still need a licensed pro for permits and inspections. DIY could save $1,722–$2,214 in labor.
Compare prices from licensed, insured contractors in St. Louis.
Get Free Quotes from St. Louis Pros →The average cost to install ductwork in St. Louis ranges from $1,890 to $7,570, with most homeowners paying around $3,780. This estimate includes both labor ($2,460) and materials ($1,320). Costs in St. Louis are lower than the national average due to local cost of living and labor market conditions. Get multiple quotes from licensed St. Louis contractors to lock in the best price.
Yes, St. Louis typically requires a permit for ductwork installation. Budget $69–$276 for permit fees and expect 1–2 weeks for approval. Your contractor typically handles the permit application. Working without a required permit can void warranties and create problems when selling your home.
Most ductwork installation projects in St. Louis take 2–5 days to complete. The timeline depends on project scope, contractor availability in the St. Louis metro area, and seasonal demand. Scheduling during St. Louis's off-peak season (typically fall and winter) can reduce wait times and may lower costs.
Metal ductwork lasts 20–25 years or longer if maintained. Flexible ductwork typically lasts 10–15 years before degrading. Signs of failing ductwork include uneven temperatures between rooms, dusty air, high energy bills, and visible damage or disconnection.
If your ducts are over 15 years old, leaky, poorly insulated, or improperly sized, replacing them with your new HVAC system maximizes efficiency. Leaky ducts waste 20–30% of conditioned air. At minimum, have ducts professionally sealed and tested.