How Much Does Ductwork Installation Cost in Novato, CA? (2026)

Average Cost

$5,903–$12,624

Materials

$2,730–$6,950

Labor (North Bay)

$1,811–$2,761

Labor rates in North Bay are +18% compared to Sacramento Metro baseline.

Ductwork installation includes designing the duct layout for proper airflow distribution, fabricating and installing trunk lines and branch runs using sheet metal or flex duct, sealing all connections with mastic and foil tape, insulating ducts in unconditioned spaces, and installing registers and grilles. Properly designed and sealed ductwork is critical for HVAC efficiency — leaky ducts can waste 20-30% of conditioned air. This estimate covers new installations and full replacements using NorCal 2025-2026 pricing.

In Sacramento's extreme summer heat, ducts running through unconditioned attics (often 140 °F+) must be well-insulated and sealed to prevent massive energy waste and maintain consistent room temperatures.

Novato is located in Marin County (North Bay). North Marin family-oriented city with 1960s–90s suburban neighborhoods. The local utility provider is PG&E.

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City

Linear feet of ductwork

Materials Included

Galvanized sheet metal duct100 linear ft

$800–$1,800

Insulated flex duct (R-6 or R-8)50 linear ft

$150–$350

Duct mastic sealant & foil tape100 set

$1,500–$4,000

Duct insulation wrap (R-6)100 linear ft

$150–$400

Supply registers & return grilles10 each

$80–$250

Duct hangers, straps & fasteners100 set

$50–$150

Labor(North Bay +18%)

Sheet metal installer15h @ $77–$118/hr

$1,151–$1,770

HVAC technician8h @ $83–$124/hr

$661–$991

Contractor Markup30%

0%Avg 30%100%

Materials

$2,730–$6,950

Labor

$1,811–$2,761

Markup

$1,362–$2,913

Estimated Total Cost

$5,903 – $12,624

$59–$126 per unit

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California Building Code

California Title 24 mandates R-6 minimum duct insulation in unconditioned spaces, mastic sealing at all joints, and HERS-verified duct leakage testing. Maximum allowable leakage is 5% of system airflow for new installations.

Project Timeline

Design & layout

2-4 hours

Measure rooms, perform airflow calculations, design the duct layout with proper trunk and branch sizing, and determine register placement for balanced airflow.

Trunk line fabrication & installation

1-2 days

Fabricate the main trunk lines from sheet metal, install in the attic or crawl space, and hang with proper support straps at required intervals.

Branch runs & register installation

1-2 days

Run branch ducts from the trunk to each room, cut in register boots, and install supply registers and return air grilles.

Sealing, insulation & testing

4-6 hours

Seal all duct joints with mastic and foil tape, wrap exposed ducts with R-6 insulation, and perform a duct leakage test to verify compliance with Title 24 standards.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Galvanized sheet metal duct	100	linear ft	$8–$18	$800–$1,800
Insulated flex duct (R-6 or R-8)	50	linear ft	$3–$7	$150–$350
Duct mastic sealant & foil tape	100	set	$15–$40	$1,500–$4,000
Duct insulation wrap (R-6)	100	linear ft	$1.5–$4	$150–$400
Supply registers & return grilles	10	each	$8–$25	$80–$250
Duct hangers, straps & fasteners	100	set	$0.5–$1.5	$50–$150

Ductwork Installation in Novato — FAQ

Should I use sheet metal or flex duct?+

Sheet metal ducts offer better airflow and durability but cost more. Flex duct is economical for branch runs but must be pulled tight with no kinks. Most Sacramento installations use sheet metal trunks with flex branch runs — a good balance of cost and performance.

How do I know if my existing ducts need replacement?+

Signs include uneven temperatures between rooms, excessive dust, visible duct deterioration, age over 15-20 years, or high energy bills. A duct leakage test can quantify how much conditioned air you're losing.

What is duct leakage testing?+

California Title 24 requires duct leakage testing on new installations. A HERS rater pressurizes your duct system and measures air loss. Ducts must leak less than 5% of total airflow to pass inspection.

How long does ductwork installation take?+

A full ductwork installation for a 1,500-2,000 sq ft home typically takes 2-4 days. Simple replacements or partial runs can be completed in 1-2 days.