How much does window replacement cost?

Per window (installed): vinyl double-hung $300-$800, vinyl casement $350-$900, fiberglass $500-$1,200, wood $500-$1,500+, bay/bow $1,500-$5,000+. Whole-house (15-20 windows): vinyl $5,000-$15,000, premium $10,000-$25,000+. Factors: frame material, glass type (double vs triple pane, Low-E), installation type (retrofit vs full-frame), and geographic location. Federal tax credit: 30% of cost up to $600 for ENERGY STAR windows. Get 3+ quotes and replace all windows at once for volume discounts. When should I replace my windows?

When should I replace my windows?

Replace when: condensation between panes (seal failure, can't be repaired), drafty/air leaks (hold a candle near the frame on windy day), difficulty operating (sticking, won't lock), visible damage (rotting wood, cracked glass, warped frames), or windows are 15-20+ years old (vinyl) or 20-30+ years (wood). Even functional old windows have poor energy performance vs modern standards. Upgrading to ENERGY STAR windows can reduce energy costs 10-25%. Single-pane windows should always be replaced. What type of window is best?

What type of window is best?

Best overall (most popular): vinyl double-hung ($300-$800 installed). Low maintenance, good insulation, tilt-in for easy cleaning, classic look. Best seal/ventilation: casement ($350-$900, crank-out, excellent airtight seal). Best premium: fiberglass ($500-$1,200, strongest, most stable, low maintenance, can be painted). Best traditional: wood ($500-$1,500+, beautiful but requires maintenance every 3-7 years). For frame material: vinyl is best value, fiberglass is best performance, wood is best aesthetics. Always choose ENERGY STAR certified with Low-E coating and argon gas fill.

Article

Siding & Exterior

Window Replacement Guide: Cost, Types & When to Replace

Lumberama Editorial Team, Windows & Energy Efficiency Specialists Nov 12, 2025 10 min read

Signs You Need New Windows

Drafts and air leaks: Hold a candle near the window frame on a windy day. If the flame flickers, air is leaking through. Drafty windows waste energy and make rooms uncomfortable.

Condensation between panes: Fog or moisture between the glass panes means the seal has failed. The insulating gas (argon or krypton) has escaped. The window has lost its insulating value. The unit must be replaced (the seal cannot be repaired).

Difficulty operating: Windows that stick, jam, won't stay open, or won't lock properly. This can be caused by warped frames (wood), failed balances (double-hung), or paint buildup. If the hardware or mechanisms have failed, replacement is often more practical than repair.

Visible damage: Rotting wood frames or sashes. Cracked or broken glass. Warped or bowed frames. Water stains on the sill or wall below the window (indicates water infiltration).

High energy bills: Single-pane windows or old double-pane windows with failed seals significantly increase heating and cooling costs. Upgrading to modern energy-efficient windows can reduce energy costs by 10-25%.

Noise: If outside noise is excessive, modern windows with double or triple panes and laminated glass dramatically reduce sound transmission.

Age: Windows older than 15-20 years (vinyl) or 20-30 years (wood) are often at or past their useful life. Even if they still function, their energy performance is far below modern standards.

Window Types

Double-hung: The most popular window type. Both the upper and lower sashes slide up and down. Tilt-in sashes for easy cleaning (you can clean the outside from inside the house). Classic look, fits most home styles. Good ventilation (open the top and bottom for natural airflow). Cost: $300-$800 per window (installed).

Casement: Hinged on one side, swings outward with a crank handle. Excellent seal when closed (the sash presses against the frame). Best ventilation of any window type (the entire opening is unobstructed). Ideal for hard-to-reach locations (above sinks, counters). Cost: $350-$900 per window.

Sliding: One or both sashes slide horizontally. Simple operation. Good for wide openings. Contemporary look. Less airtight than casement (the sashes don't press against the frame). Cost: $250-$700 per window.

Picture/fixed: Does not open. Maximizes natural light and views. Most energy-efficient (no moving parts means no air leaks). Often used in combination with operable windows. Cost: $200-$600 per window.

Awning: Hinged at the top, swings outward from the bottom. Can be left open during light rain (the sash acts as an awning). Often installed above or below other windows. Cost: $350-$800 per window.

Bay/bow: Projects outward from the house, creating a shelf or seating area. Bay: typically 3 windows at angles (a large center window with two side windows). Bow: 4-6 windows in a gentle curve. Adds space, light, and architectural interest. Cost: $1,500-$5,000+ (installed).

Specialty/custom: Arched, circular, octagonal, or custom shapes. Typically fixed (non-operable). Used for architectural accent. Cost: $500-$3,000+ depending on shape and size.

Frame Materials

Vinyl: The most popular choice (60%+ of replacement windows sold). Affordable. Low maintenance (never needs painting or staining). Good insulator (vinyl doesn't conduct heat). Durable (won't rot, rust, or corrode). Available in white and a limited range of colors/finishes (some manufacturers offer wood-grain interiors). Cons: can warp or discolor in extreme heat. Not as structurally strong as wood or fiberglass (may flex in large openings). Cost: $250-$800 per window (installed).

Wood: Classic, traditional look. Excellent insulator. Can be painted or stained any color. Strong and structurally rigid. Cons: requires regular maintenance (painting or staining every 3-7 years). Susceptible to rot, insects, and moisture damage. Most expensive frame material. Cost: $500-$1,500+ per window.

Fiberglass: The strongest frame material. Excellent insulator. Low maintenance (similar to vinyl). Will not warp, rot, or expand/contract. Can be painted. The most dimensionally stable (ideal for large openings). Cons: more expensive than vinyl (but less than wood). Fewer manufacturer options. Cost: $500-$1,200 per window.

Aluminum: Strong and lightweight. Slim profiles (more glass, less frame). Low maintenance. Cons: conducts heat (poor insulator without a thermal break). Can corrode in coastal environments. Best for: commercial buildings, contemporary homes, and warm climates where insulation is less critical. Cost: $300-$900 per window.

Composite (wood/polymer): Wood fibers + polymer resin (Andersen Fibrex is the best-known example). Stronger than vinyl, less maintenance than wood. Good insulator. Available in various colors. Cost: $400-$1,000 per window.

Energy Efficiency

U-factor: Measures how well the window insulates (how much heat passes through). Lower is better. Single-pane: U-factor ~1.0. Standard double-pane: U-factor ~0.50. Low-E double-pane: U-factor ~0.30. Triple-pane: U-factor ~0.20. ENERGY STAR requires U-factor of 0.30 or lower in Northern climates, 0.40 or lower in Southern climates.

Solar Heat Gain Coefficient (SHGC): Measures how much solar heat the window lets in. Lower SHGC = less solar heat (better for warm climates, south/west-facing windows). Higher SHGC = more solar heat (can be beneficial in cold climates to capture free solar heating). ENERGY STAR: 0.25 or lower in Southern climates, 0.40 or higher can be beneficial in Northern climates.

Low-E coatings: A microscopic metallic coating on the glass that reflects infrared heat. Low-E2 (standard): reflects heat back toward the source (keeps heat in during winter, out during summer). Low-E3 (enhanced): even more solar heat rejection (ideal for south/west-facing windows in warm climates). Low-E coatings also block UV rays (protects furniture, floors, and artwork from fading).

Gas fill: Argon: the standard insulating gas between panes. Improves insulation by ~15% vs air. Affordable. Krypton: denser than argon, better insulation. Used in triple-pane or thin-gap designs. More expensive.

ENERGY STAR: Always buy ENERGY STAR-certified windows. They meet strict energy efficiency requirements for your climate zone. Federal tax credit: 30% of cost (up to $600 for windows) under the 25C Energy Efficient Home Improvement Credit.

Cost

Per window (installed): Vinyl double-hung (standard): $300-$800. Vinyl casement: $350-$900. Fiberglass: $500-$1,200. Wood: $500-$1,500+. Bay/bow: $1,500-$5,000+.

Whole-house replacement: Average home (15-20 windows): $5,000-$15,000 (vinyl). Premium (fiberglass or wood): $10,000-$25,000+. Factors: window type, frame material, glass options (double vs triple pane, Low-E), installation complexity (new construction vs retrofit), number of windows, and geographic location.

Installation types: Pocket/insert installation (retrofit): the new window is installed inside the existing frame. Faster, less disruptive, and less expensive. Best when the existing frame is in good condition. Full-frame (tear-out) installation: the entire window including the frame is removed and replaced. More labor-intensive and expensive, but provides the best fit and performance. Required when the existing frame is damaged or rotted.

Saving money: Replace all windows at once (volume discount + one mobilization cost). Get 3+ quotes from different installers. Buy mid-range windows (the jump from budget to mid-range is worth it; mid-range to premium often isn't). Take advantage of the federal tax credit (30% up to $600) and any utility rebates. Consider financing (many window companies offer 0% financing for 12-24 months).