Wood & Fiberglass Window Replacement cost in Delaware (2026)
Across Delaware, wood and fiberglass window replacement varies by your city's labor rates, climate and permit fees. Select your city below for a localized estimate.
wood and fiberglass window replacement typically falls in this range across 2 Delaware cities — your exact estimate depends on local rates.
| City | Typical 2026 range |
|---|---|
| Wilmington, DE | $10,500 – $26,100 |
| Dover, DE | $9,850 – $24,450 |
Wood & Fiberglass Window Replacement cost by type in Delaware
Typical 2026 ranges, localized to Delaware labor, climate and permits.
| Type | Delaware 2026 range |
|---|---|
| Fiberglass | $10,500 – $23,000 |
| Composite | $11,550 – $24,050 |
| Aluminum-clad wood | $13,650 – $28,200 |
| Solid wood | $14,700 – $31,300 |
Cheapest time for wood and fiberglass window replacement in Delaware
Window installers slow down in cold months and manufacturers run their deepest promotions in fall and winter, so off-season buyers catch both labor discounts and rebates.
Climate-zone spec
What window rating you need in Delaware
Delaware sits in a mixed climate — the North-Central / South-Central ENERGY STAR window zone. To qualify for ENERGY STAR (v7.0), replacement windows here should meet:
Mixed climates need balance: a low U-factor for winter plus a controlled SHGC so summer sun doesn't overheat the home. Requirements tighten as you move south.
Thresholds from ENERGY STAR Residential Windows v7.0. Costadia groups cities into cold / mixed / hot bands — for your exact county's zone, use the ENERGY STAR Climate Zone Finder. Source.
Rebates & incentives
The federal window tax credit is gone for 2026, but ENERGY STAR windows can still earn utility rebates in some areas — and the real long-run savings come from lower heating and cooling bills.
- The federal 25C tax credit (up to $600/yr for ENERGY STAR Most Efficient windows) ended December 31, 2025 under the One Big Beautiful Bill Act — not available for 2026.
- Some utilities still rebate high-efficiency windows — real examples include Mass Save (~$75/window on single-pane replacements) and Puget Sound Energy (up to $100/window, more for income-qualified, through 2026).
- There is no federal HEAR rebate for windows (that program targets electrification equipment like heat pumps), so utility and state programs are the path — check the DSIRE database.
- The durable savings are on your energy bills: right-rated windows for your climate zone cut heating/cooling costs every year (see the climate-zone spec above).
Verified July 2026. Program budgets and windows change fast — confirm current amounts and eligibility with your utility and the DSIRE database. Costadia does not administer these programs.
Wood & Fiberglass Window Replacement in Delaware
How much does wood and fiberglass window replacement cost in Delaware?
Across Delaware, wood and fiberglass window replacement typically runs $9,850–$26,100 in 2026, depending on your city's labor rates, climate and permit fees. Dover is the most affordable (around $17,150) and Wilmington the most expensive (around $18,300).
Which Delaware city is cheapest for wood and fiberglass window replacement?
Dover has the lowest typical wood and fiberglass window replacement cost in Delaware at about $17,150, while Wilmington is the highest at about $18,300 — a gap driven mostly by local labor rates.
How do other Windows options compare in Delaware?
In Wilmington, Delaware's largest market, wood and fiberglass window replacement typically runs $10,500–$26,100. For comparison, vinyl window replacement runs $5,300–$15,700. Each option has its own Delaware cost guide with city-by-city pricing.
Why does wood and fiberglass window replacement cost vary across Delaware?
The three levers are local labor rates, climate zone and permit fees. In this mixed-climate region, look for a balanced low-E package on wood and fiberglass window replacement to handle both heating and cooling seasons. A mid-range low-E package tends to be the most cost-effective choice in this climate.
When is the cheapest time to replace in Delaware?
The best window is late fall and winter, when demand drops and installers discount to keep crews busy — typically 5–15% off peak pricing. The priciest time is an emergency job during spring and summer peak.
Does Delaware require a permit for wood and fiberglass window replacement?
Most Delaware cities require a permit for wood and fiberglass window replacement; it typically adds around $125 and is already included in the estimates above.
Other Windows projects in Delaware
Weighing your options? Typical 2026 ranges below are localized to Wilmington, Delaware's largest market — open any project for the full statewide breakdown.