Window Replacement Cost Guide for Contractors
Window replacement costs $300–$1,200 per window for insert (pocket) installation and $500–$2,000+ per window for full-frame replacement. Vinyl windows cost $200–$600, fiberglass $400–$900, wood $500–$1,200, and aluminum-clad wood $600–$1,500 per unit. A 15-window whole-house project runs $6,000–$25,000 installed. Target 35–45% gross margin with volume discounts from suppliers.
Window replacement is a core service for remodeling contractors, generating strong revenue with predictable scopes and installation timelines. Whether as part of a whole-house renovation or a standalone project, accurate window estimating requires understanding the difference between insert and full-frame installation, material options, energy efficiency ratings, and how to leverage supplier relationships for better margins. This guide covers pricing for every major window type and installation method.
Insert vs. Full-Frame Replacement
The installation method determines both cost and scope. Insert (pocket) replacement keeps the existing window frame and installs a new sash unit inside it. This is faster (1–2 hours per window), less expensive ($150–$400 labor per window), and causes minimal disruption to interior and exterior trim. However, the new window is slightly smaller than the original opening, reducing glass area by 10–15%. Full-frame replacement removes the entire window including the frame down to the rough opening. Labor runs $300–$600 per window and the project involves exterior siding repair, interior trim replacement, and potentially new flashing. Full-frame is required when the existing frame is rotted, out of square, or when upgrading to a different window size. It also provides the best energy performance because new insulation fills the gaps between the frame and rough opening. For a 15-window project: insert replacement runs $6,000–$15,000 total (materials plus labor), while full-frame runs $12,000–$30,000. Always inspect existing frames during your site assessment — discovering rot or water damage after ordering insert windows wastes time and money.
Window Frame Materials and Pricing
Vinyl windows from brands like Simonton, Ply Gem, and Harvey dominate the replacement market at $200–$600 per unit. They offer excellent energy performance, zero maintenance, and the best value for most homeowners. Mid-range vinyl (Simonton Reflections, Harvey Tribute) runs $300–$500 per unit with better hardware and glass packages. Fiberglass windows from Marvin Ultrex, Pella Impervia, and Integrity (by Marvin) cost $400–$900 per unit. They are stronger than vinyl, do not expand and contract as much with temperature swings, and can be painted. Fiberglass is excellent for large or specialty-shaped openings. Wood windows from Andersen, Pella, and Marvin cost $500–$1,200+ per unit. They offer the best aesthetics and are often required for historic homes. Interior wood with aluminum or fiberglass cladding on the exterior provides the beauty of wood inside with a maintenance-free exterior. Andersen 400 Series ($400–$800) and Pella Lifestyle ($500–$1,000) are the most popular clad options. Aluminum windows ($300–$700) are used primarily in commercial and coastal applications. When recommending windows to clients, match the material to the home style, budget, and maintenance expectations.
Energy Efficiency Ratings and Upselling
Energy-efficient windows are both a selling point and a margin opportunity. Key ratings: U-Factor measures heat transfer (lower is better) — Energy Star requires 0.30 or below in northern climates and 0.40 or below in southern. Solar Heat Gain Coefficient (SHGC) measures how much solar heat enters — lower is better in cooling-dominated climates, higher in heating-dominated climates. Visible Transmittance (VT) measures how much light enters — higher is better for naturally lit rooms. Double-pane low-E glass with argon fill is the minimum standard for replacement windows. Triple-pane windows from Andersen, Marvin, or Alpen add $50–$150 per unit and provide U-Factors of 0.15–0.22 — excellent for cold climates and noise reduction. Energy Star-certified windows qualify for federal tax credits of up to $600 per year (30% of project cost, capped at $600). This tax credit is a powerful sales tool — present the after-tax-credit cost in your proposals. Upgrade pricing: going from standard double-pane to triple-pane on a 15-window project adds $750–$2,250 to the material cost but provides measurably better comfort and energy savings. Low-E coatings, argon or krypton gas fills, and warm-edge spacers are standard on quality replacement windows.
Specialty Windows and Custom Sizes
Specialty windows command premium pricing and higher margins. Bay windows cost $1,200–$3,500 per unit installed including the structural support, roof, and interior finishing. Bow windows (4–6 individual units in a curved configuration) run $1,500–$5,000 installed. Picture windows (fixed, non-operable) are less expensive than operable windows at $200–$800 per unit since they have no operating hardware. Sliding windows cost the same as double-hung in most brands. Casement windows (crank-operated) cost 10–20% more than double-hung and offer better air sealing. Egress windows for basement bedrooms cost $1,500–$4,000 per unit installed including the window well, excavation, and foundation cutting. Custom-sized windows (non-standard dimensions) typically add a 15–30% premium over standard sizes and have longer lead times (4–8 weeks versus 2–4 weeks for stock sizes). Architectural shapes (arched, round, octagonal) from Marvin, Pella, or Andersen cost $500–$2,500+ per unit depending on size and complexity. Historic window replication for preservation projects runs $800–$3,000+ per window — these require matching original profiles, muntin patterns, and sometimes glass types.
Installation Process and Labor
A skilled two-person crew can install 6–10 insert windows per day or 3–5 full-frame windows per day. Labor cost per window: insert installation $150–$400, full-frame $300–$600. These rates include window installation, shimming, insulating, interior and exterior trim, and cleanup. For insert installations: remove the old sash and hardware, clean the existing frame, apply sealant, set the new insert window, shim and level, insulate the gap with low-expansion foam (Great Stuff or DAP), reinstall interior stops, and apply exterior caulk. For full-frame installations: remove the entire window and frame, inspect the rough opening for rot or damage, repair as needed, install new flashing (Vycor Plus or Protecto Wrap) per window manufacturer specifications, set the new window, shim and level, insulate, install interior casing and trim, and install exterior casing, brick mold, and siding patches. Critical installation details: never use high-expansion foam around windows (it bows the frame and voids the warranty), always flash the rough opening per manufacturer specs, and ensure proper sill slope for water drainage. Installation quality determines long-term performance — a premium window installed poorly will leak and fail.
Pricing Strategy and Volume Discounts
Window replacement projects should target 35–45% gross margin. Establish relationships with window distributors (not big-box stores) for contractor pricing — distributor costs are typically 30–50% below retail. Volume purchases of 10+ windows earn additional discounts of 5–15% from most manufacturers. Buy windows direct from the manufacturer or through a distributor, not from the home center — your cost on a $400 retail window should be $200–$280 through proper channels. Present window replacement as a whole-house project whenever possible. A single window replacement at $500–$1,200 generates minimal revenue. A 15-window project at $400–$1,500 per window generates $6,000–$22,500 with much better efficiency. Your proposal should include: window specifications (brand, model, glass package), installation method, trim details, warranty terms, and estimated energy savings. Avoid presenting a per-window price that invites the client to cherry-pick which windows to replace — quote the whole-house price with a note that partial projects are available at a higher per-unit cost. Payment: 50% deposit (to cover material procurement), 50% at completion. Windows typically have 2–4 week lead times.
Frequently Asked Questions
Window replacement costs $300–$1,200 per window for insert installation and $500–$2,000+ for full-frame replacement. Vinyl windows are $200–$600 per unit, fiberglass $400–$900, and wood or clad $500–$1,500. A whole-house project (15 windows) runs $6,000–$25,000 installed. Bay and bow windows cost $1,200–$5,000 each. Custom and specialty shapes add 15–30% premiums.
Create Professional Estimates in Minutes
Stop spending hours on estimates. QuotrPro uses AI to help remodelers create accurate, professional proposals that win more jobs.
Try Free for 3 DaysNo credit card required · 30-day money-back guarantee
Related Articles
Siding Replacement Estimating Guide for Contractors
How to estimate siding replacement including vinyl, fiber cement, wood, and engineered wood. Material costs, labor rates, and profit margins for remodeling contractors.
Insulation Upgrade Cost Guide for Contractors
How to estimate insulation upgrades including spray foam, blown-in, batt, and rigid foam. R-values, costs per square foot, and profit margins for remodeling contractors.
Whole-House Renovation Estimating Guide for Contractors
How to estimate whole-house renovations including phasing, subcontractor coordination, budget allocation, and risk management. Pricing strategies for remodeling contractors.
Home Addition Estimating Guide for Contractors
How to estimate home additions including foundation, framing, roofing, and tying into existing systems. Cost breakdowns and margin strategies for remodeling contractors.
Outdoor Living Space Cost Guide for Contractors
How to estimate outdoor living spaces including decks, patios, pergolas, outdoor kitchens, and screened porches. Pricing and margins for remodeling contractors.
More Remodelers Estimating Guides
No credit card required