How Much Does Double-Hung Window Replacement Cost in Los Gatos, CA? (2026)

Average Cost

$3,520–$7,001

Materials

$1,520–$3,635

Labor (South Bay)

$1,188–$1,750

Labor rates in South Bay are +25% compared to Sacramento Metro baseline.

Double-hung window replacement is the most common window upgrade in NorCal homes. The project includes removing the old window sash and frame (or performing a retrofit insert), installing the new unit with proper flashing and insulation, and finishing with interior and exterior trim. Modern double-hung windows feature dual Low-E glass, argon gas fill, and multi-point locks for improved energy efficiency and security. In the Sacramento region, Title 24 energy code requires a maximum U-factor of 0.30 and SHGC of 0.23 for replacement windows, making dual-pane Low-E the minimum standard.

Sacramento's hot summers (100+ °F) and mild winters make Low-E glass with a low SHGC rating critical for reducing cooling costs. West- and south-facing windows benefit most from solar heat gain control.

Los Gatos is located in Santa Clara County (South Bay). Affluent hillside town with Victorian-era homes, newer estates, and boutique downtown. The local utility provider is PG&E.

Cost Calculator

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City

Windows

Materials Included

Vinyl Double-Hung Window (Low-E, argon filled)5 unit

$1,250–$3,000

Window Flashing Tape & Membrane5 roll

$75–$175

Spray Foam Insulation (low-expansion, per can)5 can

$40–$75

Interior & Exterior Trim Kit5 set

$125–$325

Exterior Silicone Caulk (weatherproof)5 tube

$30–$60

Labor(South Bay +25%)

Window Installer10h @ $81–$119/hr

$813–$1,188

Helper / Trim Carpenter7.5h @ $50–$75/hr

$375–$563

Contractor Markup30%

0%Avg 30%100%

Materials

$1,520–$3,635

Labor

$1,188–$1,750

Markup

$812–$1,616

Estimated Total Cost

$3,520 – $7,001

$704–$1,400 per unit

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California Building Code

California Title 24 (2022 Energy Code) requires replacement windows to meet maximum U-factor of 0.30 and SHGC of 0.23 in Climate Zones 11-13 (Sacramento region). All replacement windows must carry NFRC certification labels. Egress requirements apply to bedroom windows.

Project Timeline

Measurement & Ordering

1-2 weeks lead time

Measure each window opening precisely for the replacement units. Verify rough opening dimensions, check for out-of-square conditions, and order custom-sized windows.

Old Window Removal

20-30 min per window

Remove interior trim, cut sealant, release the old sash and frame, and inspect the rough opening for rot or damage. Repair framing as needed.

New Window Installation

30-45 min per window

Dry-fit the new window, shim for plumb and level, secure with screws, apply flashing tape per manufacturer sequence, and fill gaps with low-expansion foam.

Trim & Finishing

20-30 min per window

Install interior casing and sill, apply exterior trim or J-channel, caulk all exterior joints, and test sash operation, locks, and tilt-in cleaning feature.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Vinyl Double-Hung Window (Low-E, argon filled)	5	unit	$250–$600	$1,250–$3,000
Window Flashing Tape & Membrane	5	roll	$15–$35	$75–$175
Spray Foam Insulation (low-expansion, per can)	5	can	$8–$15	$40–$75
Interior & Exterior Trim Kit	5	set	$25–$65	$125–$325
Exterior Silicone Caulk (weatherproof)	5	tube	$6–$12	$30–$60

Double-Hung Window Replacement in Los Gatos — FAQ

How much does window replacement cost in Sacramento?+

A standard vinyl double-hung window replacement in the Sacramento area runs $450-$900 per window installed, depending on size and glass options. A whole-house project (10-15 windows) typically costs $5,000-$12,000.

Do I need a permit for window replacement?+

In most NorCal jurisdictions, like-for-like window replacement (same size opening) does not require a permit. However, if you change the window size or convert a window to a door, a permit is required. Title 24 energy compliance documentation is always required.

What is the best window brand for NorCal homes?+

Milgard, Anlin, and Simonton are popular choices in NorCal due to strong regional warranties and Title 24 compliance. Andersen and Marvin are premium options. All should meet the 0.30 U-factor requirement.

How long do vinyl windows last?+

Quality vinyl windows last 20-30 years in NorCal's climate. The seals on dual-pane glass typically last 15-20 years before fogging may occur. Fiberglass frames last even longer at 30-40 years.

Will new windows lower my energy bills?+

Replacing single-pane windows with dual-pane Low-E units can reduce heating and cooling costs by 15-25%. In Sacramento's hot summers, low SHGC glass significantly reduces solar heat gain and AC load.