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Window Replacement Cost in Delaware (2026)

Window replacements in Delaware typically run $5,400–$14,400 for a 10-window 1,500 sq ft single-story full-house window replacement, with vinyl-frame double-hung the dominant residential choice and ENERGY STAR North-Central climate-zone glazing requirements (U-factor ≤ 0.32, SHGC ≤ 0.4). Delaware's combination of 130 mph ASCE 7-22 design wind speed across Sussex County and southern Kent County driving ASTM E1996 large-missile impact-rated window mandate on every coastal residential install, persistent Atlantic and Delaware Bay salt-spray on every Sussex County coastal exposure driving aluminum-clad-wood frame recommended on every coastal install, FEMA NFIP base-flood-elevation foundation height verification on every Bethany Beach to Rehoboth coastal residential install, and ENERGY STAR North-Central climate zone U-0.32 mandate drives unique coastal-Atlantic-and-North-Central-climate-driven glazing selection.

State Delaware
Cities Covered 2
Typical 10-window 1,500 sq ft single-story full-house window replacement $5,400 – $14,400
BLS carpenter wage $23.34/hr

Delaware climate, wind & energy-code drivers

  • ENERGY STAR climate zone: North-Central — heating-dominant, balanced U-factor and SHGC (U ≤ 0.32, SHGC ≤ 0.40)
  • IECC climate zone: 4A
  • Maximum U-factor: 0.32 (IECC 2021 + state amendments)
  • Maximum SHGC: 0.4
  • ASCE 7-22 design wind speed: 130 mph (Risk Category II)
  • Hurricane impact-rated requirement: Mandatory ASTM E1996 large-missile impact-rated in coastal counties only
  • Dominant residential frame material: Vinyl frame — dominant in most climates, lowest cost-per-window
  • Historic-preservation overlay prevalence: Moderate — selected metro historic districts with review
  • EPA RRP lead-safe trigger (pre-1978 housing share): Moderate — 20-40% pre-1978 housing share, EPA RRP required on selected replacements

Delaware licensing, lead-safe & permits

  • License status: Statewide registration required (no exam)
  • License board: Delaware Division of Revenue — Business License (window installer) (official site)
  • Permit: county building permit required for window opening modification; Delaware Business License only — no state-issued specialty license; replacement-only same-size installs typically permit-exempt; Sussex County coastal counties mandate ASTM E1996 large-missile impact-rated windows

How window replacement costs vary in Delaware

State-specific code or insurance rule: Delaware is one of the few East Coast states with no specialty window contractor licensing — every Delaware window contractor operates under a Delaware Division of Revenue Business License only, with no examination, bond, or board oversight, leaving Sussex County coastal property owners to rely on contractor BBB ratings rather than a state credential check, and Delaware Sussex County coastal jurisdictions separately require ASTM E1996 large-missile impact resistance on every coastal residential window installation to address Atlantic hurricane exposure with 130 mph ASCE 7-22 design wind speed.

Cities in Delaware

Compare window replacement pricing for 2 cities across Delaware.

Dover, DE

Compare local window replacement pricing in Dover.

Wilmington, DE

Compare local window replacement pricing in Wilmington.

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More state guides

Pricing ranges reflect Delaware market labor (BLS OEWS carpenter (window installers) mean $23.34/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.