cost-guide

Window Replacement Cost in Berkeley | Hamilton Exteriors

What window replacement costs in Berkeley in 2026. Price ranges by window style, Berkeley permit fees, and energy savings. CSLB #1078806.

Hamilton Admin

— 13 min read

Window Replacement Cost in Berkeley (2026 Guide)

By Alex Hamilton Li, Architect & General Contractor (CSLB #1078806)

April 25, 2026 · Updated April 25, 2026 · 12 min read

A full window replacement in Berkeley costs between $9,000 and $28,000 for a typical home with 10 to 20 windows in 2026 (Hamilton Exteriors 2024-2026 project data). The price per window, fully installed, ranges from $800 for a basic single-slider to $4,500 for a custom bay window. Berkeley's older housing stock, local permit requirements, and the city's unique microclimates all influence the final number.

This guide breaks down the cost of window replacement in Berkeley by style, material, and home type. It covers permit fees, energy-efficiency standards, and the specific challenges of replacing windows in Berkeley's historic homes, hillside properties, and fog-belt neighborhoods. At Hamilton Exteriors, we provide itemized estimates that list every window unit, labor charge, and permit fee separately.

Average Window Replacement Cost in Berkeley (2026)

For a single-family home in Berkeley with 10 to 20 windows, here is what homeowners can expect to pay in 2026:

  • Standard vinyl windows (single-hung, double-hung, slider): $9,000 to $18,000 total, or $800 to $1,200 per window installed (Hamilton Exteriors 2024-2026 project data).
  • Premium vinyl or fiberglass windows (casement, picture): $12,000 to $24,000 total, or $1,000 to $1,800 per window installed.
  • Wood or wood-clad windows (double-hung, casement): $15,000 to $28,000 total, or $1,500 to $2,500 per window installed.
  • Specialty windows (bay, bow, custom shapes): $3,000 to $7,000 per unit installed.

These ranges include removal of the old window, new construction or retrofit installation, flashing, insulation, interior trim, and exterior trim. They do not include structural repairs, lead paint abatement, or permit fees, which are addressed below.

Berkeley window replacement costs run 10 to 20 percent higher than the national average. The primary drivers are Bay Area labor rates, Berkeley's older housing stock (roughly 60 percent of Berkeley homes were built before 1960, according to the U.S. Census Bureau American Community Survey), and the city's permit and energy-efficiency requirements.

Window Replacement Cost by Style in Berkeley

The style of window you choose is the single largest cost variable. Here is what each style costs per unit, fully installed, in Berkeley in 2026.

Single-Hung and Double-Hung Windows: $800 to $1,500 per Window

Single-hung windows have a fixed top sash and an operable bottom sash. Double-hung windows allow both sashes to open. Both are common in Berkeley's Craftsman, Victorian, and Colonial Revival homes.

  • Vinyl single-hung: $800 to $1,100 per window installed (Hamilton Exteriors 2024-2026 project data).
  • Vinyl double-hung: $900 to $1,300 per window installed.
  • Wood double-hung: $1,500 to $2,200 per window installed.

Double-hung windows are the most popular replacement choice in Berkeley's flatland neighborhoods (central Berkeley, South Berkeley, West Berkeley) because they match the original window style of most pre-1940 homes.

Casement Windows: $1,000 to $1,800 per Window

Casement windows are hinged on the side and crank open outward. They provide the best ventilation of any operable window style, capturing 50 to 90 percent more airflow than sliders according to the American Architectural Manufacturers Association (AAMA). This makes them an excellent choice for Berkeley homes that rely on natural cooling rather than air conditioning.

  • Vinyl casement: $1,000 to $1,400 per window installed (Hamilton Exteriors 2024-2026 project data).
  • Fiberglass casement: $1,300 to $1,800 per window installed.
  • Wood casement: $1,600 to $2,200 per window installed.

Casement windows are popular in the Berkeley Hills, where homeowners want to capture the bay breeze and maximize natural ventilation during warm summer afternoons.

Sliding Windows: $800 to $1,200 per Window

Sliding windows move horizontally along a track. They are common in mid-century homes and apartments throughout Berkeley. They require no exterior clearance, making them practical for walkways, patios, and areas where a projecting sash would be a hazard.

Picture Windows: $900 to $2,500 per Window

Picture windows are fixed, non-operable windows that maximize glass area and natural light. They are the most energy-efficient window type because they have no moving parts and the tightest possible seal. In Berkeley, picture windows are often used to frame views of the bay, the Golden Gate Bridge, or the Berkeley Hills.

  • Vinyl picture window: $900 to $1,500 per window installed (Hamilton Exteriors 2024-2026 project data).
  • Fiberglass picture window: $1,300 to $2,000 per window installed.
  • Large custom picture window (6 ft x 6 ft or larger): $2,000 to $2,500 installed.

Bay and Bow Windows: $3,000 to $7,000 per Window

Bay and bow windows project outward from the wall, creating additional interior floor space and a panoramic view. They are a signature feature of many Berkeley Victorians and Craftsman homes.

Bay window installations are more complex than standard window replacements. They often require structural support, roof flashing, and sometimes foundation work. A structural engineer's assessment may be needed for larger units, adding $500 to $1,500 to the project cost (Hamilton Exteriors 2024-2026 project data).

Window Frame Materials and Their Costs in Berkeley

The frame material affects the window's cost, durability, energy efficiency, and appearance. Here is how the four main materials compare for Berkeley homes.

Vinyl Windows: $800 to $1,500 per Window

Vinyl is the most affordable and most common window frame material. Modern vinyl windows are made from UV-stabilized polyvinyl chloride (PVC) with multi-chambered frames that provide good insulation. They require no painting and are resistant to the fog and salt air that affect Berkeley's coastal-adjacent neighborhoods.

  • Pros: Lowest cost, low maintenance, good insulation, resistant to moisture and salt corrosion.
  • Cons: Limited color options (white and tan are standard), cannot be painted, may warp in extreme heat (rare in Berkeley's climate).
  • Best for: Most Berkeley homes, especially in the flatlands and fog-belt neighborhoods of West Berkeley.

Fiberglass Windows: $1,200 to $2,000 per Window

Fiberglass frames are made from glass-reinforced resin. They expand and contract at roughly the same rate as glass, which means the seal between the frame and the glass stays tight over decades of temperature cycling. This makes fiberglass an excellent choice for Berkeley Hills homes that experience wider temperature swings between foggy mornings and sunny afternoons.

  • Pros: Extremely durable, paintable, excellent insulation, minimal expansion/contraction.
  • Cons: Higher cost than vinyl, fewer manufacturer options.
  • Best for: Berkeley Hills homes, homes with large window openings, homeowners planning to stay 20+ years.

Wood Windows: $1,500 to $2,500 per Window

Wood windows are the traditional choice for Berkeley's historic homes. They offer the authentic look that matches original Craftsman, Victorian, and Colonial Revival architecture. Modern wood windows come with aluminum or vinyl cladding on the exterior to protect against moisture while preserving the wood interior.

  • Pros: Authentic appearance, paintable or stainable, excellent insulation, required by some historic district guidelines.
  • Cons: Highest cost, requires periodic painting or sealing, susceptible to rot if not maintained.
  • Best for: Historic homes in central Berkeley, homes in designated historic districts, homeowners who prioritize architectural authenticity.

Aluminum Windows: $700 to $1,200 per Window

Aluminum windows are lightweight, strong, and affordable. However, they are poor insulators compared to other materials, which is why they are rarely used as primary windows in Berkeley homes. They are most commonly found in mid-century apartment buildings and as secondary windows in sunrooms or garages.

  • Pros: Low cost, strong, narrow frames maximize glass area.
  • Cons: Poor insulation (high U-factor), prone to condensation, can corrode in Berkeley's foggy conditions.
  • Best for: Budget-conscious replacements, non-living spaces, mid-century apartment buildings.

Berkeley-Specific Factors That Affect Window Replacement Cost

Berkeley has unique characteristics that influence window replacement costs. Homeowners should understand these factors before getting estimates.

Berkeley's Older Housing Stock

Berkeley has one of the oldest housing stocks in the Bay Area. According to the U.S. Census Bureau American Community Survey, approximately 60 percent of Berkeley homes were built before 1960, and roughly 30 percent were built before 1940. Older homes present several window replacement challenges:

  • Non-standard window sizes. Many pre-1940 Berkeley homes have windows that do not match modern standard sizes. Custom-sized windows cost 20 to 40 percent more than standard sizes.
  • Lead paint. Homes built before 1978 may have lead paint on window frames and surrounding trim. The EPA's Lead Renovation, Repair and Painting (RRP) Rule requires lead-safe work practices, which add $50 to $150 per window for containment and cleanup.
  • Structural issues. Older window openings may have sagging headers, rotted framing, or out-of-square rough openings that require carpentry repair before new windows can be installed. Budget $100 to $500 per window for structural corrections.

Berkeley's Microclimates and Energy Efficiency

Berkeley's climate varies significantly between neighborhoods. The flatlands and West Berkeley experience persistent morning fog from the San Francisco Bay, while the Berkeley Hills get more sun and warmer afternoon temperatures. These microclimates affect window performance and material choices.

  • Fog-belt neighborhoods (West Berkeley, central Berkeley): Moisture and salt-laden marine air accelerate corrosion on aluminum frames and can cause wood rot on poorly maintained wood windows. Fiberglass and vinyl frames resist this corrosion. Argon-filled double-pane glass with Low-E coating provides the best balance of insulation and condensation resistance.
  • Berkeley Hills: Homes at higher elevations experience wider temperature swings and more direct sun exposure. Windows with a lower Solar Heat Gain Coefficient (SHGC) reduce solar heat gain during warm afternoons. The U.S. Department of Energy recommends an SHGC of 0.25 or lower for west-facing windows in California's climate zone 3.

Berkeley Building Permit Requirements

The City of Berkeley Building Department requires a building permit for window replacements that involve structural changes, such as enlarging an opening, adding a new window, or replacing a window with a different style that requires framing modifications. Simple retrofit replacements (same size, same opening) may not require a permit, but it is always best to confirm with the building department.

Berkeley permit fees for window replacement typically range from $200 to $600, depending on the scope of work (Hamilton Exteriors 2024-2026 project data). The permit process includes a plan review and a final inspection to verify that the windows meet California Title 24 energy standards and Berkeley's local building codes.

Berkeley Hills Fire Zone Considerations

Portions of the Berkeley Hills are designated as Wildland-Urban Interface (WUI) zones by CAL FIRE. Homes in these zones are subject to California Chapter 7A building code requirements for exterior materials. While Chapter 7A primarily addresses roofing and siding, windows in WUI zones must meet specific standards:

  • Tempered glass may be required for windows facing wildland areas to resist heat and ember exposure.
  • Dual-pane windows with at least one pane of tempered glass are recommended for all WUI-zone homes.
  • Non-combustible frame materials (fiberglass, aluminum) are preferred over wood or vinyl in the highest-risk areas.

If your Berkeley Hills home is in a WUI zone, confirm the specific window requirements with the Berkeley Building Department before ordering windows. WUI-compliant windows typically cost 10 to 20 percent more than standard windows.

Energy Savings from Window Replacement in Berkeley

Replacing old single-pane windows with modern ENERGY STAR-certified windows saves Berkeley homeowners $125 to $465 per year on energy bills, according to the U.S. Department of Energy. The actual savings depend on the condition of the old windows, the efficiency of the new windows, and the home's heating and cooling systems.

Key Energy Performance Ratings

  • U-Factor: Measures how well a window insulates. Lower is better. ENERGY STAR requires a U-factor of 0.30 or lower for Northern California. Hamilton Exteriors installs windows with U-factors as low as 0.25.
  • Solar Heat Gain Coefficient (SHGC): Measures how much solar heat a window lets in. Lower is better for warm climates. For Berkeley's mixed climate, an SHGC of 0.25 to 0.40 provides a good balance.
  • Visible Transmittance (VT): Measures how much light passes through. Higher is better for daylighting. Most quality windows have a VT of 0.50 to 0.70.

Title 24 Compliance

California's Title 24 Building Energy Efficiency Standards set minimum performance requirements for replacement windows. All windows installed in Berkeley must meet or exceed Title 24 requirements. The key requirement is a maximum U-factor of 0.30 and a maximum SHGC of 0.23 for climate zone 3 (which includes Berkeley).

Hamilton Exteriors installs windows that exceed Title 24 requirements by 15 to 20 percent, which qualifies homeowners for utility rebates and federal tax credits.

Available Rebates and Tax Credits

Berkeley homeowners who install ENERGY STAR-certified windows may qualify for:

  • Federal tax credit: Up to $600 per year under the Inflation Reduction Act (through 2032) for windows that meet ENERGY STAR Most Efficient criteria.
  • BayREN rebates: The Bay Area Regional Energy Network (BayREN) offers rebates for energy-efficient home improvements, including window replacement, through participating contractors.
  • Manufacturer rebates: Window manufacturers like Milgard, Andersen, and Marvin periodically offer rebates of $50 to $250 for qualifying installations.

Hamilton Exteriors provides all documentation needed for rebate and tax credit applications.

Window Replacement Cost for Different Berkeley Home Types

Berkeley's housing stock is diverse, ranging from 1920s Craftsman bungalows to 1960s mid-century homes to contemporary hillside houses. Each home type has different window replacement considerations and costs.

Craftsman Bungalows (Flatlands, Central Berkeley)

Berkeley's flatland neighborhoods are filled with Craftsman bungalows built between 1910 and 1930. These homes typically have:

  • Double-hung windows with divided-light (gridded) upper sashes.
  • Wood frames that match the home's original trim.
  • Multiple windows grouped in pairs or triples in living and dining rooms.

Replacement cost for a typical 3-bedroom Craftsman bungalow with 15 to 18 windows: $16,000 to $28,000 for wood or wood-clad double-hung windows (Hamilton Exteriors 2024-2026 project data). Vinyl double-hung windows with simulated divided lights reduce the cost to $12,000 to $18,000.

Berkeley Hills Mid-Century Homes

Homes built in the Berkeley Hills in the 1950s and 1960s often feature:

  • Large picture windows to capture bay and city views.
  • Aluminum-frame sliding windows that are now at the end of their service life.
  • Floor-to-ceiling window walls in living areas.

Replacement cost for a mid-century hillside home with 12 to 16 windows, including large picture windows: $18,000 to $32,000 for fiberglass or vinyl windows (Hamilton Exteriors 2024-2026 project data). Replacing aluminum sliders with modern fiberglass sliders improves energy efficiency significantly.

Victorian and Edwardian Homes (Central Berkeley, North Berkeley)

Berkeley's Victorian and Edwardian homes, built between 1890 and 1910, have distinctive window styles:

  • Tall, narrow double-hung windows with ornate trim.
  • Bay windows in front parlors.
  • Decorative leaded or stained glass in entryways and stairwells.

Replacement cost for a Victorian with 20 to 25 windows, including bay windows: $25,000 to $45,000 for wood windows that match the original profiles (Hamilton Exteriors 2024-2026 project data). Custom sizing and historic trim matching add to the cost. Some Berkeley historic district guidelines may require wood windows rather than vinyl or fiberglass.

How Hamilton Exteriors Approaches Window Replacement in Berkeley

At Hamilton Exteriors, we take a different approach to window replacement than most Bay Area contractors. Here is what sets our process apart.

Architect-Led Assessment

Every window replacement project starts with an on-site assessment by Alex Hamilton Li, a licensed architect and general contractor (CSLB #1078806). This means we evaluate your windows as part of the whole building system, considering:

  • Structural integrity of existing window openings.
  • Energy performance of the entire wall assembly, not just the window unit.
  • Architectural compatibility with your home's style and era.
  • Ventilation and daylighting for each room.

Itemized Estimates

Every estimate we provide is fully itemized. You see the cost of each window unit, the labor for each opening, the flashing and insulation materials, the permit fee, and the cleanup. This transparency lets you compare options and understand exactly where your money goes.

Factory-Certified Installation

Our installation crews are factory-certified by our manufacturer partners. This certification requires annual training and quality audits. It also qualifies your windows for enhanced manufacturer warranties that are not available through uncertified installers.

Berkeley Permitting Expertise

We handle the entire Berkeley permit process, from application to final inspection. We know the Berkeley Building Department's requirements, the specific energy-efficiency standards that apply, and the WUI-zone rules for hillside properties. Permit fees appear as a separate line item in your estimate.

Frequently Asked Questions

How much does window replacement cost in Berkeley?

A full window replacement in Berkeley costs $9,000 to $28,000 for a typical home with 10 to 20 windows (Hamilton Exteriors 2024-2026 project data). The per-window cost ranges from $800 for a basic vinyl slider to $4,500 for a custom bay window. The total depends on the number of windows, the style and material chosen, and the condition of the existing window openings.

Do I need a permit to replace windows in Berkeley?

A permit is required for window replacements that involve structural changes, such as enlarging an opening or adding a new window. Simple retrofit replacements (same size, same opening) may not require a permit. Berkeley permit fees for window replacement typically range from $200 to $600. Always confirm with the Berkeley Building Department before starting work.

What is the best window style for Berkeley's climate?

Casement windows provide the best ventilation for Berkeley's mild climate, capturing 50 to 90 percent more airflow than sliders. Double-hung windows are the most versatile and match the original style of most Berkeley Craftsman and Victorian homes. For fog-belt neighborhoods, fiberglass frames resist moisture and salt corrosion better than wood or aluminum.

How much can I save on energy bills with new windows?

ENERGY STAR-certified windows save Berkeley homeowners $125 to $465 per year on energy bills, according to the U.S. Department of Energy. Homes with original single-pane windows see the largest savings. Dual-pane Low-E windows reduce heat loss in winter and heat gain in summer.

How long does window replacement take in Berkeley?

A full window replacement for a typical Berkeley home with 15 to 20 windows takes 2 to 4 days. Each window takes approximately 45 to 90 minutes to remove, prep, install, insulate, flash, and trim. We install one window at a time and seal each opening before moving to the next.

What window frame material is best for Berkeley?

Fiberglass offers the best combination of durability, energy efficiency, and moisture resistance for Berkeley's climate. Vinyl is the most affordable and requires no maintenance. Wood provides the most authentic look for historic homes but requires periodic painting. Aluminum is the least expensive but the poorest insulator and most susceptible to corrosion in foggy conditions.

Do replacement windows qualify for rebates in Berkeley?

Yes. ENERGY STAR-certified windows may qualify for a federal tax credit of up to $600 under the Inflation Reduction Act (Hamilton Exteriors 2024-2026 project data). BayREN offers additional rebates for energy-efficient window upgrades. Manufacturer rebates from Milgard, Andersen, and Marvin are also periodically available.

Are there special window requirements for Berkeley Hills fire zones?

Homes in Berkeley Hills WUI zones may require tempered glass and non-combustible frame materials under California Chapter 7A building code. WUI-compliant windows cost 10 to 20 percent more than standard windows. Confirm requirements with the Berkeley Building Department before ordering.

How do I know if my Berkeley home has lead paint?

Homes built before 1978 may have lead paint on window frames. The EPA requires lead-safe work practices for window replacement in these homes, which adds $50 to $150 per window (Hamilton Exteriors 2024-2026 project data). A certified lead inspector can test your windows before the project starts.

What is the difference between retrofit and new-construction window installation?

Retrofit installation fits a new window into the existing frame without removing exterior trim or siding. It is faster and less expensive but may reduce the glass area slightly. New-construction installation removes the old window down to the rough opening and installs a new window with new flashing. It is required when the existing frame is damaged or when changing window sizes.

How do I choose a window replacement contractor in Berkeley?

Look for a contractor with a valid CSLB license, factory certifications from window manufacturers, and experience with Berkeley's older housing stock. Ask for itemized estimates that break out window units, labor, permits, and cleanup. Check references from Berkeley homeowners with homes similar to yours. Read our guide on how to choose an exterior contractor for more detail.

Ready for an itemized window replacement estimate for your Berkeley home? Call Hamilton Exteriors at (650) 977-3351 or Get Your Free Quote.

Read more