Whole-Home Window Replacement in Wilmington, DE
Trolley Square: wood double-hung windows with rotted sash cords; Highlands Victorians under Historic District Commission review; Brandywine Hundred: 1990s vinyl replacements at the end of the factory warranty — Wilmington windows are the strongest market we serve and the most varied scope per opening.
Wilmington's older housing stock makes it our anchor market for whole-home window jobs. The work varies more here per opening than anywhere else in our service area: original wood sashes that need restoration rather than replacement, HDC-overlay homes where vinyl replacement gets flagged, mid-century homes ready for first-time replacement, and 1990s-2000s subdivisions on the Brandywine Hundred edge where the IGU has lost seal but the frame is still sound.
Why Wilmington Window Work Is Different
HDC overlay homes get a diagnostic before a quote
Highlands Historic District Commission and the West End overlay both apply primarily to exterior changes — and window replacement is the most common exterior change a homeowner asks for. A blanket vinyl-on-vinyl replacement quote in an HDC home is a quote on work that may not get approved. The patterns we've seen across multiple Highlands projects: in-kind wood double-hung restoration is almost always approved; wood replacement with historically appropriate profiles is usually approved with documentation; vinyl-on-vinyl replacement is usually flagged unless the home already has approved vinyl from a prior application; modern aluminum-clad units typically get flagged. Before we quote your Highlands or West End window project, we confirm the overlay status of your address and recommend the scope likely to fly. That diagnostic step is the difference between a quote you can act on and a quote that needs revision after HDC review.
Sash cord restoration on pre-1930 wood double-hungs
Most pre-1930 Wilmington row homes still have their original wood double-hung windows. The wood itself is usually sound — old-growth heart-pine and oak that doesn't get manufactured anymore — but the sash cords have rotted, the counterweights are stuck in the pulley pockets, the glazing putty has failed at the muntins, and the sashes either rattle in the frame or refuse to open. The honest call for most of these homes isn't replacement — it's restoration. New cords through the existing pulleys, fresh glazing, weather-stripping retrofit, and a careful repaint preserve the historic profile and cost less than full unit replacement. About one in five Wilmington window estimates ends with a repair-or-restore recommendation rather than a full replacement quote. We tell you which one your home calls for at the estimate, not after we've quoted you on the more expensive option.
Mid-1990s and early-2000s vinyl IGU diagnostic in Brandywine Hundred
Brandywine Hundred homes from the 1990s and early 2000s typically had vinyl replacement windows installed during the original construction or in a mid-life refresh. Those units are now reaching the 20-25 year seal-failure mark: condensation between the panes, desiccant saturated, sash function degrading. Some need full-unit replacement; others need only the IGU (the insulated glass unit itself) swapped within the existing frame. The diagnostic happens at the estimate — frame and sash condition determine whether you're paying for new windows or for new glass, and the cost difference is significant. The parent Whole-Home Windows page covers full brand-tier pricing for full-window scope; this page covers the Wilmington-specific decision tree on whether full or partial is right for your home.
Sentinel Storage staging for premium-brand deliveries
Premium-tier window brands (Andersen 400 Series, Pella Architect, Marvin, custom millwork wood replacement) often arrive on shipping schedules that don't line up with installation windows. Storing a full whole-home order of 10-12 windows at a Wilmington row home with no garage isn't practical. We coordinate window deliveries through Sentinel Storage in Wilmington as the staging point, which keeps the units protected and dry until install day and removes the on-property logistics from the homeowner's plate. This is logistics that the bigger national window installers don't always handle — they ship to the address regardless of whether the homeowner has a place to store the boxes.
Wilmington Window Scope by Housing Era
Pre-1930 row homes (Trolley Square, Highlands, Forty Acres, Hedgeville, Wawaset Park)
Typical scope: original wood double-hung restoration where the wood is sound (new cords, glazing, weather-stripping, careful repaint), in-kind wood replacement where the originals can't be saved, HDC coordination on overlay homes, lead-safe protocols on virtually every project, sash counterweight pulley repair, and original hardware preservation where possible.
Typical range: $1,500–$3,500 per opening for restoration; $1,800–$3,500 per opening for in-kind wood replacement. Whole-home pricing depends on opening count and brand tier.
1930s-1950s singles (Westover Hills, parts of Highlands)
Typical scope: original wood window assessment, restoration where possible, mid-tier or premium replacement where the originals are past the point of restoration. Less common HDC overlay involvement than pre-1930 row homes, but still possible in pockets of Highlands.
Typical range: $1,200–$2,800 per opening for in-kind wood replacement; premium-tier vinyl or aluminum-clad runs $900–$1,600 per opening for typical units.
1990s-2000s newer construction (Brandywine Hundred edges, scattered infill)
Typical scope: IGU-only replacement when the frame and sash are sound (the most cost-effective scope when applicable), full-unit replacement when frame condition warrants. Diagnostic at estimate determines which.
Typical range: $300–$700 per IGU for partial scope; $900–$1,600 per opening for full-unit replacement at mid-tier brand specifications.
1950s-1980s mid-century ranches and colonials (most of Brandywine Hundred)
Typical scope: first-generation aluminum or wood-frame window replacement; mid-tier vinyl as the most common selection; predictable behind-the-wall conditions; straight whole-home replacement without restoration considerations.
Typical range: $900–$1,400 per opening for mid-tier vinyl whole-home; whole-home 10-12 window jobs typically run $14,000–$22,000 inclusive of installation.
Our Reviews
What We Don't Quote Without an In-Home Visit
Window scope is the service category where photo-only or phone-only quotes go wrong the most often. Honest scope-limit framing:
Window count from a phone call — we measure rough openings during the estimate, not from the homeowner's count, because what gets quoted as "10 windows" sometimes turns out to be 14 once we count the basement and stairwell openings.
HDC-coordination timeline without confirming overlay status — some Highlands addresses are in the overlay, and some adjacent addresses are not. We check before we quote.
Brand-tier pricing without seeing the home — premium-tier specifications works best on certain housing eras; mid-tier specifications work better on others. The estimate visit determines fit before the quote.
Restoration-or-replacement decision without inspecting the wood — pre-1930 wood sash condition varies window by window in the same home. Some are restorable, some aren't.
Outside of frozen-pipe triage, our normal scheduling applies: estimate within a few business days, written quote within a few days after, work scheduled accordingly. We don't market ourselves as a 24-hour emergency plumber for Wilmington — that's not the operating model. Frozen pipes are the specific exception we keep open for the housing-era reality of pre-1930 row homes during a cold snap.
What to Expect — Wilmington Window Project Process
Free In-Home Estimate Visit
Free in-home estimate visit. We measure rough openings, assess frame and sash condition unit by unit, confirm HDC overlay status, if applicable, and walk through restoration-versus-replacement decisions for each window.
Written Quote
Written quote within a few days. Per-opening pricing is visible separately, so you can see which units are driving cost.
Brand & Tier Selection
Brand and tier selection coordination with links to the manufacturer's product details.
HDC Application Coordination
HDC application coordination, if applicable (timeline adds 4-12 weeks depending on commission schedule).
Order Placement & Lead Time
Order placement: manufacturer lead time is typically 4-10 weeks for premium brands and 2-6 weeks for mid-tier vinyl.
Sentinel Storage Staging
Delivery coordinated through Sentinel Storage staging for larger orders.
Installation
Installation typically runs 2-4 days for a whole-home 10-12 window job; lead-safe protocols on pre-1978 paint disturbance add to the timeline.
Final Walk-Through & Warranty
Final walk-through and 1-year workmanship warranty in writing. Manufacturer warranty passes through separately.
FAQs
Depends on whether your address sits inside the Highlands HDC overlay (some blocks are in, adjacent blocks may be exempt). We confirm overlay status before quoting and tell you what's likely to fly. In-kind wood restoration is almost always; vinyl-on-vinyl is usually flagged unless the home already has approved vinyl from a prior application.
Often yes, when the wood is sound. About one in five Wilmington window estimates ends with a restoration recommendation rather than a full replacement quote. Restoration preserves the historic profile, the original glass, and the period-appropriate hardware — usually for less money than full replacement.
In newer Brandywine Hundred construction where the frame and sash are sound but the IGU has lost seal, glass-only (IGU) replacement is often the right answer at a fraction of full-window cost. The diagnostic at the estimate determines which scope applies to your home.
Order to install typically runs 4-10 weeks depending on brand and tier. Installation itself runs 2-4 days for a typical 10-12 window job. HDC review adds 4-12 weeks if your project requires it.
We coordinate with you on the paperwork — assembling photos, specifications, and documentation the commission needs. The application itself goes through the homeowner; the actual approval comes from the HDC review committee. We'll tell you at the estimate what's likely to fly before you spend money on plans that won't get approved.
Get a Free Wilmington Window Estimate
Related Wilmington services: Kitchen Remodel × Wilmington · Bathroom Remodel × Wilmington · Whole-Home Windows × Wilmington · Plumbing & Water Heaters × Wilmington · or back to the full Wilmington Service Area.
Monday – Sunday, 7 AM – 8 PM
221 New York Ave, Claymont, DE 19703
