DIY vs Hire Door Installation: Compare the Real Cost

Is $660.00 the right DIY cost for installing 2 doors?

On the defaults — 2 doors at $220.00 of materials each, $45.00 of supplies and 5 hours of your time at $35.00 an hour — installing the doors costs $660.00 to do yourself, against a $800.00 pro cost, so DIY wins by $140.00. The DIY cost is the doors times the materials per door plus the supplies plus your hours valued at your hourly rate; the pro cost is the doors times the pro price per door. A typical pro door installation runs $150–$500 or more per door installed, depending on the door — a pre-hung interior door is usually $150–$350 fitted, an exterior door $500–$1,000 or more because it needs weatherproofing, and custom sizes or second-storey work add labour. Common DIY materials: the pre-hung door itself $150–$400, shims, screws, caulk, trim and insulation foam $30–$60 a door.

Four things about the model are worth stating plainly. First, the materials are $220.00 a door — 2 doors is $440.00 of doors. Second, the DIY cost is $660.00 — $440.00 of doors + $45.00 of supplies + 5 × $35.00 of your time. Third, the pro cost is $800.00 — 2 × $400.00 a door. And fourth, DIY wins by $140.00 — but the answer turns on your hourly value: at $64.00 an hour hiring wins; all listed in Accuracy & limitations.

The worked example, line by line

Setup: 2 doors at $220.00 of materials each, $45.00 of supplies, 5 hours at $35.00 an hour, pro price $400.00 a door.

Line 1 — the DIY cost. The DIY cost is 2 × $220.00 + $45.00 + 5 × $35.00 = $660.00.

Line 2 — the pro cost. The pro cost is 2 × $400.00 = $800.00.

Line 3 — the winner. $800.00 − $660.00 = $140.00 — DIY wins by $140.00.

Line 4 — the check. $440.00 + $45.00 + $175.00 = $660.00, the DIY cost; and $660.00 + $140.00 = $800.00, the pro cost.

Every branch, checked

Hours 10: DIY $835.00; pro $800.00 — Hiring wins by $35.00 — With 10 hours the DIY cost is $835.00 — pro wins by $35.00.

Materials $300 per door: DIY $820.00; pro $800.00 — Hiring wins by $20.00 — With $300.00 of materials a door the DIY cost is $820.00 — pro wins by $20.00.

Hourly value $60: DIY $785.00; pro $800.00 — DIY wins by $15.00 — With your time at $60.00 an hour the DIY cost is $785.00 — DIY wins by $15.00.

Pro price $300 per door: DIY $660.00; pro $600.00 — Hiring wins by $60.00 — With a $300.00 pro price the pro total is $600.00 — pro wins by $60.00.

Doors 4: DIY $1,100.00; pro $1,600.00 — DIY wins by $500.00 — With 4 doors the DIY cost is $1,100.00 and the pro cost is $1,600.00 — DIY wins by $500.00.

Materials $400 per door: DIY $1,020.00; pro $800.00 — Hiring wins by $220.00 — With $400.00 of materials a door the DIY cost is $1,020.00 — pro wins by $220.00.

Supplies $0, hours 3, hourly value $25: DIY $515.00; pro $800.00 — DIY wins by $285.00 — With no supplies and 3 hours at $25.00 an hour the DIY cost is $515.00 — DIY wins by $285.00.

The reverses, worked backwards

Smallest whole-dollar hourly value where hiring WINS: At the displayed $64.00 the figures are DIY $805.00; pro $800.00 — Hiring wins by $5.00. At the displayed $64.00 the DIY cost is $805.00 and hiring wins by $5.00. At $63.00 the DIY cost is $800.00 — a dead heat, a TIE, not a hiring win — so $64.00 is the smallest whole-dollar hourly value where hiring wins.

Largest whole-dollar hourly value where DIY still wins by at least $100.00: At the displayed $43.00 the figures are DIY $700.00; pro $800.00 — DIY wins by $100.00. At the displayed $43.00 the DIY cost is $700.00 and DIY wins by $100.00. At $44.00 the DIY cost is $705.00 and DIY wins by only $95.00 — below $100 — so $43.00 is the largest whole-dollar hourly value where DIY still wins by at least $100.00.

Smallest whole-dollar pro price per door where DIY wins by at least $100.00: At the displayed $380.00 the figures are DIY $660.00; pro $760.00 — DIY wins by $100.00. At the displayed $380.00 DIY wins by $100.00 exactly. At a $379.00 pro price DIY wins by only $98.00 — below $100 — so $380.00 is the smallest whole-dollar pro price per door where DIY wins by at least $100.00.

Smallest whole-dollar materials per door where hiring WINS: At the displayed $291.00 the figures are DIY $802.00; pro $800.00 — Hiring wins by $2.00. At the displayed $291.00 the DIY cost is $802.00 and hiring wins by $2.00. At $290.00 the DIY cost is $800.00 — a dead heat, a TIE, not a hiring win — so $291.00 is the smallest whole-dollar materials per door where hiring wins.

Smallest whole-dollar supplies where hiring WINS: At the displayed $186.00 the figures are DIY $801.00; pro $800.00 — Hiring wins by $1.00. At the displayed $186.00 the DIY cost is $801.00 and hiring wins by $1.00. At $185.00 the DIY cost is $800.00 — a dead heat, a TIE, not a hiring win — so $186.00 is the smallest whole-dollar supplies where hiring wins.

Smallest whole-hours value where hiring WINS: At the displayed 10 hours the figures are DIY $835.00; pro $800.00 — Hiring wins by $35.00. At the displayed 10 hours the DIY cost is $835.00 and hiring wins by $35.00. At 9 hours the DIY cost is $800.00 — a dead heat, a TIE, not a hiring win — so 10 hours is the smallest whole-hours value where hiring wins.

A note on the ties: at $290.00 of materials a door the DIY cost is $800.00 — exactly the pro cost — so it is a dead heat, not a hiring win; hiring only wins at $291.00. The same holds for supplies: at $185.00 the DIY cost is $800.00, a dead heat, and hiring only wins at $186.00. The same holds for hours: at 9 hours the DIY cost is $800.00, a dead heat, and hiring only wins at 10 hours. And at a $330.00 pro price the DIY cost is $660.00 — a dead heat, a TIE. One more edge: with 3 doors, materials of $187.45, supplies of $62.38, 7.5 hours at $48.25 an hour and a $425.00 pro price, the DIY cost is $986.605 unrounded — shown as $986.61 after rounding — and DIY wins by $288.395 unrounded — shown as $288.40 after rounding. With your time at $110.00 an hour and 8 hours, the DIY cost is $1,365.00 — pro wins by $565.00.

What the defaults assume

The defaults are 2 doors at $220.00 of materials each, $45.00 of supplies, 5 hours at $35.00 an hour and a $400.00 pro price per door — DIY $660.00; pro $800.00 — DIY wins by $140.00. With Hours 10, DIY $835.00; pro $800.00 — Hiring wins by $35.00. With Materials $300 per door, DIY $820.00; pro $800.00 — Hiring wins by $20.00. With Hourly value $60, DIY $785.00; pro $800.00 — DIY wins by $15.00. With Pro price $300 per door, DIY $660.00; pro $600.00 — Hiring wins by $60.00. With Doors 4, DIY $1,100.00; pro $1,600.00 — DIY wins by $500.00. With Materials $400 per door, DIY $1,020.00; pro $800.00 — Hiring wins by $220.00. With Supplies $0, hours 3, hourly value $25, DIY $515.00; pro $800.00 — DIY wins by $285.00. With Doors 1, everything $0, DIY $0.00; pro $400.00 — DIY wins by $400.00. With Hours 0, hourly value $0, DIY $485.00; pro $800.00 — DIY wins by $315.00. With Doors 3, materials $187.45, supplies $62.38, hours 7.5, hourly value $48.25, pro $425, DIY $986.61; pro $1,275.00 — DIY wins by $288.40. With Pro price $330 per door, DIY $660.00; pro $660.00 — exact tie. With Hourly value $110, hours 8, DIY $1,365.00; pro $800.00 — Hiring wins by $565.00. With Pro price $550 per door, DIY $660.00; pro $1,100.00 — DIY wins by $440.00. With Win-by bars — DIY $660.00, pro price per door for a $100.00 DIY win $380.00; for a $300.00 DIY win $480.00; materials per door for a $100.00 DIY win $240.00.

Output · formula · meaning

Who uses this

• The homeowner with 2 standard doors: they learn installing them costs $660.00 to do themselves against a $800.00 pro cost — and they check the $64.00 reverse to see where hiring takes over.
• The homeowner whose time is pricey: they learn at $60.00 an hour DIY still wins by $15.00 — and they check the $380.00 reverse to see how high the pro price must be before DIY wins by $100.00.
• The homeowner facing a $291 materials bill: they learn hiring wins by $2.00 at that materials cost — and they check the $290.00 tie to see that one dollar less is a dead heat, not a hiring win.
• The homeowner with a 10-hour job: they learn at 10 hours hiring wins by $35.00 — and they check the $186.00 reverse to see how much supplies must cost before hiring wins.

Accuracy & limitations

The math is first-principles: the DIY cost is the doors times the materials per door plus the supplies plus the hours times the hourly value; the pro cost is the doors times the pro price per door; the winner is the lower total. The reverses are judged on the UNROUNDED totals: at $290.00 of materials a door the DIY cost is $800.00, exactly the pro cost, so it ties; at $291.00 the DIY cost is $802.00, so hiring wins by $2.00. The same rounding shows in the fractional edge: the DIY cost is $986.605 unrounded, shown as $986.61 after rounding, and the win is $288.395 unrounded, shown as $288.40 after rounding. What the model cannot do is price your doors: the $150–$500 pro range and the $150–$400 door range are typical figures, not quotes; a badly hung door sticks, drafts and voids the manufacturer’s warranty, and a badly sealed exterior door leaks water 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 exterior doors can cut heating and cooling bills, but the payback takes years — the saving is not a reason to replace sound doors early. Use it to see which side wins on your numbers — then get a real quote before you book.

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