DIY vs Hire Window Replacement: Which Is Cheaper in 2026?

Is $1,060.00 the right DIY cost for replacing 4 windows?

On the defaults — 4 windows at $180.00 of materials each, $60.00 of supplies and 8 hours of your time at $35.00 an hour — replacing the windows costs $1,060.00 to do yourself, against a $1,800.00 pro cost, so DIY wins by $740.00. The DIY cost is the windows times the materials per window plus the supplies plus your hours valued at your hourly rate; the pro cost is the windows times the pro price per window. A typical pro window replacement runs $300–$1,000 or more per window installed, depending on the frame material — vinyl is usually cheapest at $450–$600 fitted, wood and fibreglass cost more, and custom sizes or second-storey work add labour. Common DIY materials: the window itself $150–$400, flashing tape, caulk, shims, insulation foam and trim $40–$80 a window.

Four things about the model are worth stating plainly. First, the materials are $180.00 a window — 4 windows is $720.00 of windows. Second, the DIY cost is $1,060.00 — $720.00 of windows + $60.00 of supplies + 8 × $35.00 of your time. Third, the pro cost is $1,800.00 — 4 × $450.00 a window. And fourth, DIY wins by $740.00 — but the answer turns on your hourly value: at $128.00 an hour hiring wins; all listed in Accuracy & limitations.

The worked example, line by line

Setup: 4 windows at $180.00 of materials each, $60.00 of supplies, 8 hours at $35.00 an hour, pro price $450.00 a window.

Line 1 — the DIY cost. The DIY cost is 4 × $180.00 + $60.00 + 8 × $35.00 = $1,060.00.

Line 2 — the pro cost. The pro cost is 4 × $450.00 = $1,800.00.

Line 3 — the winner. $1,800.00 − $1,060.00 = $740.00 — DIY wins by $740.00.

Line 4 — the check. $720.00 + $60.00 + $280.00 = $1,060.00, the DIY cost; and $1,060.00 + $740.00 = $1,800.00, the pro cost.

Every branch, checked

Hours 12: DIY $1,200.00; pro $1,800.00 — DIY wins by $600.00 — With 12 hours the DIY cost is $1,200.00 — DIY wins by $600.00.

Materials $250 per window: DIY $1,340.00; pro $1,800.00 — DIY wins by $460.00 — With $250.00 of materials a window the DIY cost is $1,340.00 — DIY wins by $460.00.

Hourly value $60: DIY $1,260.00; pro $1,800.00 — DIY wins by $540.00 — With your time at $60.00 an hour the DIY cost is $1,260.00 — DIY wins by $540.00.

Pro price $350 per window: DIY $1,060.00; pro $1,400.00 — DIY wins by $340.00 — With a $350.00 pro price the pro total is $1,400.00 — DIY wins by $340.00.

Windows 2: DIY $700.00; pro $900.00 — DIY wins by $200.00 — With 2 windows the DIY cost is $700.00 and the pro cost is $900.00 — DIY wins by $200.00.

Materials $400 per window: DIY $1,940.00; pro $1,800.00 — Hiring wins by $140.00 — With $400.00 of materials a window the DIY cost is $1,940.00 — pro wins by $140.00.

Supplies $0, hours 4, hourly value $25: DIY $820.00; pro $1,800.00 — DIY wins by $980.00 — With no supplies and 4 hours at $25.00 an hour the DIY cost is $820.00 — DIY wins by $980.00.

The reverses, worked backwards

Smallest whole-dollar hourly value where hiring WINS: At the displayed $128.00 the figures are DIY $1,804.00; pro $1,800.00 — Hiring wins by $4.00. At the displayed $128.00 the DIY cost is $1,804.00 and hiring wins by $4.00. At $127.00 the DIY cost is $1,796.00 and DIY still wins by $4.00 — so $128.00 is the smallest whole-dollar hourly value where hiring wins.

Largest whole-dollar hourly value where DIY still wins by at least $500.00: At the displayed $65.00 the figures are DIY $1,300.00; pro $1,800.00 — DIY wins by $500.00. At the displayed $65.00 the DIY cost is $1,300.00 and DIY wins by $500.00. At $66.00 the DIY cost is $1,308.00 and DIY wins by only $492.00 — below $500 — so $65.00 is the largest whole-dollar hourly value where DIY still wins by at least $500.00.

Smallest whole-dollar pro price per window where DIY wins by at least $500.00: At the displayed $390.00 the figures are DIY $1,060.00; pro $1,560.00 — DIY wins by $500.00. At the displayed $390.00 DIY wins by $500.00 exactly. At a $389.00 pro price DIY wins by only $496.00 — below $500 — so $390.00 is the smallest whole-dollar pro price per window where DIY wins by at least $500.00.

Smallest whole-dollar materials per window where hiring WINS: At the displayed $366.00 the figures are DIY $1,804.00; pro $1,800.00 — Hiring wins by $4.00. At the displayed $366.00 the DIY cost is $1,804.00 and hiring wins by $4.00. At $365.00 the DIY cost is $1,800.00 — a dead heat, a TIE, not a hiring win — so $366.00 is the smallest whole-dollar materials per window where hiring wins.

Smallest whole-dollar supplies where hiring WINS: At the displayed $801.00 the figures are DIY $1,801.00; pro $1,800.00 — Hiring wins by $1.00. At the displayed $801.00 the DIY cost is $1,801.00 and hiring wins by $1.00. At $800.00 the DIY cost is $1,800.00 — a dead heat, a TIE, not a hiring win — so $801.00 is the smallest whole-dollar supplies where hiring wins.

Smallest whole-hours value where hiring WINS: At the displayed 30 hours the figures are DIY $1,830.00; pro $1,800.00 — Hiring wins by $30.00. At the displayed 30 hours the DIY cost is $1,830.00 and hiring wins by $30.00. At 29 hours the DIY cost is $1,795.00 and DIY still wins by $5.00 — so 30 hours is the smallest whole-hours value where hiring wins.

A note on the ties: at $365.00 of materials a window the DIY cost is $1,800.00 — exactly the pro cost — so it is a dead heat, not a hiring win; hiring only wins at $366.00. The same holds for supplies: at $800.00 the DIY cost is $1,800.00, a dead heat, and hiring only wins at $801.00. And at a $265.00 pro price the DIY cost is $1,060.00 — a dead heat, a TIE. One more edge: with 3 windows, materials of $212.37, supplies of $47.82, 6.5 hours at $42.75 an hour and a $475.00 pro price, the DIY cost is $962.805 unrounded — shown as $962.81 after rounding — and DIY wins by $462.195 unrounded — shown as $462.20 after rounding. With your time at $120.00 an hour and 10 hours, the DIY cost is $1,980.00 — pro wins by $180.00.

What the defaults assume

The defaults are 4 windows at $180.00 of materials each, $60.00 of supplies, 8 hours at $35.00 an hour and a $450.00 pro price per window — DIY $1,060.00; pro $1,800.00 — DIY wins by $740.00. With Hours 12, DIY $1,200.00; pro $1,800.00 — DIY wins by $600.00. With Materials $250 per window, DIY $1,340.00; pro $1,800.00 — DIY wins by $460.00. With Hourly value $60, DIY $1,260.00; pro $1,800.00 — DIY wins by $540.00. With Pro price $350 per window, DIY $1,060.00; pro $1,400.00 — DIY wins by $340.00. With Windows 2, DIY $700.00; pro $900.00 — DIY wins by $200.00. With Materials $400 per window, DIY $1,940.00; pro $1,800.00 — Hiring wins by $140.00. With Supplies $0, hours 4, hourly value $25, DIY $820.00; pro $1,800.00 — DIY wins by $980.00. With Windows 1, everything $0, DIY $0.00; pro $450.00 — DIY wins by $450.00. With Hours 0, hourly value $0, DIY $780.00; pro $1,800.00 — DIY wins by $1,020.00. With Windows 3, materials $212.37, supplies $47.82, hours 6.5, hourly value $42.75, pro $475, DIY $962.81; pro $1,425.00 — DIY wins by $462.20. With Pro price $265 per window, DIY $1,060.00; pro $1,060.00 — exact tie. With Hourly value $120, hours 10, DIY $1,980.00; pro $1,800.00 — Hiring wins by $180.00. With Pro price $600 per window, DIY $1,060.00; pro $2,400.00 — DIY wins by $1,340.00. With Win-by bars — DIY $1,060.00, pro price per window for a $500.00 DIY win $390.00; for a $1,000.00 DIY win $515.00; materials per window for a $500.00 DIY win $240.00.

Output · formula · meaning

Who uses this

• The homeowner with 4 standard windows: they learn replacing them costs $1,060.00 to do themselves against a $1,800.00 pro cost — and they check the $128.00 reverse to see where hiring takes over.
• The homeowner whose time is pricey: they learn at $60.00 an hour DIY still wins by $540.00 — and they check the $390.00 reverse to see how high the pro price must be before DIY wins by $500.00.
• The homeowner facing a $366 materials bill: they learn hiring wins by $4.00 at that materials cost — and they check the $365.00 tie to see that one dollar less is a dead heat, not a hiring win.
• The homeowner with a 30-hour job: they learn at 30 hours hiring wins by $30.00 — and they check the $801.00 reverse to see how much supplies must cost before hiring wins.

Accuracy & limitations

The math is first-principles: the DIY cost is the windows times the materials per window plus the supplies plus the hours times the hourly value; the pro cost is the windows times the pro price per window; the winner is the lower total. The reverses are judged on the UNROUNDED totals: at $365.00 of materials a window the DIY cost is $1,800.00, exactly the pro cost, so it ties; at $366.00 the DIY cost is $1,804.00, so hiring wins by $4.00. The same rounding shows in the fractional edge: the DIY cost is $962.805 unrounded, shown as $962.81 after rounding, and the win is $462.195 unrounded, shown as $462.20 after rounding. What the model cannot do is price your windows: the $300–$1,000 pro range and the $150–$400 window range are typical figures, not quotes; a badly sealed window leaks air and water, voids the manufacturer’s warranty, and can rot the frame over time; and the hourly value is yours to set — an hour of a Saturday is not worth the same to everyone. Energy-efficient windows can cut heating and cooling bills, but the payback takes years — the saving is not a reason to replace sound windows early. Use it to see which side wins on your numbers — then get a real quote before you book.

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