Stop losing money through drafty, failing windows. McDermott Construction installs energy-efficient replacement windows for homes and businesses across the Quad Cities — with the same honest craftsmanship we've built our name on since 1978.
McDERMOTT CONST. · STANDARD INSTALLATION
In a Quad Cities winter, a drafty window isn't just uncomfortable — it's a monthly expense. Older single-pane or degraded double-pane windows can account for 25–30% of a home's heat loss, showing up directly on your energy bill, month after month.
Modern energy-efficient windows — properly installed with tight sealing and quality trim work — can cut that loss dramatically. And beyond the energy savings, new windows improve security, reduce outside noise, eliminate condensation, and add measurable resale value to your home.
Quality replacement windows often pay for themselves within 5–8 years through energy savings alone — and in a Quad Cities winter, sometimes faster. We've had customers tell us their heating bill dropped noticeably the very first season. The comfort improvement is immediate. The savings keep coming.
We work with all major window configurations for both residential and commercial projects across the Quad Cities.
The most common window in Quad Cities homes. Both sashes open and tilt in for easy cleaning — ideal for bedrooms, living rooms, and any standard opening.
Hinged at the side and cranked open outward, casements seal extremely tight and offer excellent ventilation. Great for kitchens, bathrooms, and hard-to-reach spots.
Panels slide horizontally along a track — a clean, low-maintenance option that works well in contemporary homes and in spaces where the window swings outward.
Fixed-pane windows that don't open — designed to maximize natural light and frame a view. Common in living rooms and as accent windows alongside operable units.
Extend outward from your home's exterior to create a built-in alcove and add significant visual interest. A popular upgrade in living rooms and dining areas.
Store fronts, office buildings, and commercial structures have different requirements than residential. We size and install commercial glazing units that meet code and hold up to heavy use.
We make the window replacement process smooth, clean, and hassle-free from your first call to the final caulk line.
Call (309) 314-4847 or fill out our form. We schedule a site visit, measure every opening, and give you a clear, no-pressure quote.
We help you choose the right style, frame material, and glass package for your home's needs, budget, and climate performance goals.
Our crew arrives on time, removes and disposes of old windows, installs new units with proper flashing and insulation, and completes all interior and exterior trim work.
We clean up completely before we leave. Every window is inspected, every seal is checked, and we don't consider the job done until you do.
We'll come to you, measure your openings, and give you a straight number — no sales pitch, no upsell. If you have another quote already, bring that too.
In the Quad Cities area, window replacement typically costs $300–$800 per window installed, depending on window size, style, and material. Whole-home projects (10–20 windows) often range from $6,000–$20,000+. Energy-efficient upgrades, specialty shapes, or commercial units can cost more. McDermott Construction provides free on-site estimates — call (309) 314-4847.
A single window replacement typically takes 1–2 hours per window. A whole-home project with 10–20 windows can usually be completed in 1–3 days depending on scope. We schedule around your availability and leave your home clean when we're done.
Yes — particularly in our climate. Replacing single-pane or older windows with low-E, argon-filled double or triple-pane units can reduce heating and cooling costs by 15–25% in Illinois and Iowa homes. The Quad Cities sees both cold winters and humid summers, making energy-efficient windows one of the smartest improvements a homeowner can make.
Yes. We handle commercial window replacement for office buildings, retail storefronts, restaurants, and specialty commercial structures throughout the Quad Cities. Commercial projects are quoted individually — call (309) 314-4847 to discuss your needs.
We work with reputable window manufacturers whose products perform well in the Midwest climate. We'll recommend options based on your budget, performance goals, and the specific openings in your home — and we'll help you compare options honestly rather than pushing any particular brand.
Renewal by Andersen makes a quality product, but their pricing includes significant marketing overhead and a franchise model that drives up installed cost — often substantially. Many homeowners find that comparable window performance can be achieved at meaningfully lower cost through a local contractor using equivalent or better products. Before committing to any national installer, it's worth getting a second opinion. We're happy to review their quote at no charge.
Low-E (low-emissivity) glass has a microscopically thin metallic coating that reflects heat rather than absorbing and transmitting it. In winter, it keeps heat inside your home. In summer, it reflects solar heat away. Combined with argon gas fill between panes, Low-E windows dramatically reduce the amount of energy lost through your windows — which is the primary driver of energy savings. Any quality window replacement should include Low-E glass as a standard feature.
Quality vinyl replacement windows typically last 20–40 years with minimal maintenance. The window unit itself rarely fails — what degrades over time is usually the seal between panes (causing fogging) or the weatherstripping. Proper installation is critical to longevity: a window installed with poor flashing or inadequate insulation will fail prematurely regardless of its quality. This is one area where using an experienced local installer pays off over the long term.
Make sure every quote specifies the same things: window brand and product line, glass package (Low-E, argon fill, U-factor rating), frame material, warranty terms, and what's included in installation (flashing, insulation, interior and exterior trim). Many low quotes leave out trim work or use inferior glass packages. Also verify the installer is licensed and insured in Illinois — not just a subcontractor hired by a national franchise. When in doubt, call us and we'll walk you through what to compare.
Tell us about your windows — how many, what style, any special requirements — and we'll come out, take measurements, and give you a real number. No obligation, no pressure.
Call us today or request a free estimate online. We'll come to you, measure your openings, and give you straight answers — no pressure, no runaround.