DIY vs Hire Light Fixture Installation: Save or Hire?

What does a $135.00 DIY win mean?

On the defaults — a $120 fixture, $25 of supplies, 2 hours at $60 an hour and a $400 pro quote — the DIY cost is $265.00 and DIY wins by $135.00. The DIY cost is the fixture price plus the supplies plus your hours at your hourly value: $120 + $25 + 2 × $60 = $265.00. The win is the pro cost minus the DIY cost — if the win is positive, DIY wins by that much; if the win is negative, hiring wins by that much; if the win is zero, it is an exact tie. A $135.00 saving is real money, but it is not the whole story: a pro carries insurance, guarantees the fixture is level and the wiring is safe, and takes the risk of a ceiling box that will not hold the fixture and a fixture that will not sit straight. DIY wins on price; hiring wins on risk. This calculator prices the money — you price the risk.

Three things about the model are worth stating plainly.

First, there is no division here — this is addition and multiplication, not a ratio: $120 + $25 + 2 × $60 = $265.00. Second, the meaning is one hundred and thirty-five dollars saved by fitting the light fixture yourself — the price of your time, not the price of the fixture. And third, the DIY cost is displayed to two decimals, half-up, and a DIY cost that displays as $287.48 can sit a hair below the displayed figure: a $119.95 fixture, $24.40 of supplies and 2.5 hours at $57.25 an hour gives 287.475, which displays as $287.48 — all listed in Accuracy & limitations.

The worked example, line by line

Setup: fixture $120, supplies $25, 2 hours, $60 an hour, pro $400.

Line 1 — the DIY cost. $120 + $25 + 2 × $60 = $265.00.

Line 2 — the win. $400.00 − $265.00 = $135.00.

Line 3 — the check. At $128 an hour the DIY cost is $401.00 and hiring wins by $1.00; and at $127 an hour it is $399.00 — DIY wins by $1.00, so there is no tie.

Every branch, checked

Hours 1: DIY $205.00; pro $400.00 — DIY wins by $195.00 — With 1 hour the DIY cost falls to $205.00 and DIY wins by $195.00.

Hours 3: DIY $325.00; pro $400.00 — DIY wins by $75.00 — With 3 hours the DIY cost rises to $325.00 and DIY wins by $75.00.

Hours 4: DIY $385.00; pro $400.00 — DIY wins by $15.00 — With 4 hours the DIY cost rises to $385.00 and DIY wins by $15.00.

Hours 5: DIY $445.00; pro $400.00 — Hiring wins by $45.00 — With 5 hours the DIY cost rises to $445.00 and hiring wins by $45.00.

Fixture $200: DIY $345.00; pro $400.00 — DIY wins by $55.00 — With a $200 fixture the DIY cost rises to $345.00 and DIY wins by $55.00.

Fixture $60: DIY $205.00; pro $400.00 — DIY wins by $195.00 — With a $60 fixture the DIY cost falls to $205.00 and DIY wins by $195.00.

Supplies $50: DIY $290.00; pro $400.00 — DIY wins by $110.00 — With $50 of supplies the DIY cost rises to $290.00 and DIY wins by $110.00.

Hourly $80: DIY $305.00; pro $400.00 — DIY wins by $95.00 — At $80 an hour the DIY cost rises to $305.00 and DIY wins by $95.00.

Pro $300: DIY $265.00; pro $300.00 — DIY wins by $35.00 — Against a $300 pro quote the DIY cost is $265.00 and DIY wins by $35.00.

The reverses, worked backwards

Smallest hourly value where hiring WINS: At the displayed $128 the figures are DIY $401.00; pro $400.00 — Hiring wins by $1.00. At $127 an hour the figures are DIY $399.00; pro $400.00 — DIY wins by $1.00 — no tie — so $128 an hour is the smallest hourly value where hiring wins.

Largest hourly value where DIY still wins by at least $100.00: At the displayed $77 the figures are DIY $299.00; pro $400.00 — DIY wins by $101.00. At $78 an hour the figures are DIY $301.00; pro $400.00 — DIY wins by $99.00 — DIY wins by $99.00 — below the $100.00 target — so $77 an hour is the largest hourly value where DIY still wins by at least $100.00.

Smallest fixture price where hiring WINS: At the displayed $256 the figures are DIY $401.00; pro $400.00 — Hiring wins by $1.00. At $255 the figures are DIY $400.00; pro $400.00 — exact tie — a dead heat, a TIE — so $256 is the smallest fixture price where hiring wins.

Smallest hours where hiring WINS: At the displayed 5 hours the figures are DIY $445.00; pro $400.00 — Hiring wins by $45.00. At 4 hours the figures are DIY $385.00; pro $400.00 — DIY wins by $15.00 — DIY wins by $15.00 — no tie — so 5 hours is the smallest hours where hiring wins.

Smallest supplies where hiring WINS: At the displayed $161 the figures are DIY $401.00; pro $400.00 — Hiring wins by $1.00. At $160 of supplies the figures are DIY $400.00; pro $400.00 — exact tie — a dead heat, a TIE — so $161 is the smallest supplies where hiring wins.

Smallest pro price where DIY WINS at all: At the displayed $266 the figures are DIY $265.00; pro $266.00 — DIY wins by $1.00. At $265 the figures are DIY $265.00; pro $265.00 — exact tie — a dead heat, a TIE — so $266 is the smallest pro price where DIY wins at all.

A warning about the ties: at $255 of fixture price the DIY cost is $400.00 — a dead heat, a TIE, not a hiring win — and at $256 it is $401.00 and hiring wins by $1.00. At $160 of supplies the DIY cost is $400.00 — a dead heat, a TIE — and at $161 it is $401.00 and hiring wins by $1.00. At $265 of pro price the pro cost is $265.00 — a dead heat, a TIE, not a DIY win — and at $266 it is $266.00 and DIY wins by $1.00. There is no tie at $127 an hour, $77 an hour or 4 hours: at $127 DIY wins by $1.00 and at $128 hiring wins by $1.00; at $77 DIY wins by $101.00 and at $78 DIY wins by $99.00; at 4 hours DIY wins by $15.00 and at 5 hours hiring wins by $45.00.

What the defaults assume

The defaults are a $120 fixture, $25 of supplies, 2 hours at $60 an hour and a $400 pro quote — DIY $265.00; pro $400.00 — DIY wins by $135.00. With Hours 1, DIY $205.00; pro $400.00 — DIY wins by $195.00. With Hours 3, DIY $325.00; pro $400.00 — DIY wins by $75.00. With Hours 4, DIY $385.00; pro $400.00 — DIY wins by $15.00. With Hours 5, DIY $445.00; pro $400.00 — Hiring wins by $45.00. With Fixture $200, DIY $345.00; pro $400.00 — DIY wins by $55.00. With Fixture $60, DIY $205.00; pro $400.00 — DIY wins by $195.00. With Supplies $50, DIY $290.00; pro $400.00 — DIY wins by $110.00. With Hourly $80, DIY $305.00; pro $400.00 — DIY wins by $95.00. With Pro $300, DIY $265.00; pro $300.00 — DIY wins by $35.00. With All zero, DIY $0.00; pro $0.00 — exact tie — no fixture, no supplies, no hours, no pro quote — a dead heat. With Fixture $85, supplies $15, 1.5 hours, $55 an hour, pro $250, DIY $182.50; pro $250.00 — DIY wins by $67.50 — a small job with a cheap fixture and a low pro quote. With Fractional inputs (DIY unrounded 287.475, win unrounded 62.125), DIY $287.48 (unrounded 287.475); pro $349.60 — DIY wins by $62.13 (unrounded 62.125) — the DIY cost displays as $287.48. With Fixture $350, supplies $80, 4 hours, $85 an hour, pro $1,200, DIY $770.00; pro $1,200.00 — DIY wins by $430.00 — a big job with an expensive fixture and a high pro quote. With Pro $265, DIY $265.00; pro $265.00 — exact tie — a dead heat, a TIE. With Fixture $0, supplies $10, 1 hour, $50 an hour, pro $150, DIY $60.00; pro $150.00 — DIY wins by $90.00 — a fixture you already own, so the DIY cost is mostly your time.

A note on the rounding: the DIY cost is displayed to two decimals, half-up. With the fractional inputs the unrounded DIY cost is 287.475 and the unrounded win is 62.125 — they display as $287.48 and $62.13. The page prints the unrounded values so the rounding does not mislead you.

Output · formula · meaning

Who uses this

• The homeowner replacing a light fixture: they learn a $120 fixture, $25 of supplies and 2 hours at $60 an hour costs $265.00 DIY against a $400.00 pro quote — and they check the $128 reverse to see the hourly value where hiring takes the lead.
• The renter fitting a new fixture: they learn the supplies are the wire connectors, the mounting bracket, the screws and the sealant, not the fixture alone — and they check the $256 reverse to see the fixture price where hiring wins.
• The weekend DIYer pricing their time: they learn 2 hours at $60 an hour is $120 of their own time — and they check the 5-hour reverse to see the hours where hiring wins.
• The landlord comparing quotes: they learn a $265.00 DIY cost against a $400.00 pro quote is a $135.00 win — and they check the $266 reverse to see the pro price where DIY wins at all.

Accuracy & limitations

The math is first-principles: the DIY cost is the fixture price plus the supplies plus the hours times your hourly value, and the win is the pro cost minus the DIY cost — all in dollars, displayed to two decimals half-up. There is no division in this calculator — nothing is ever undefined. At a $255 fixture price the DIY cost is $400.00 — a dead heat, a TIE, not a hiring win — and at $160 of supplies the DIY cost is $400.00 — a dead heat, a TIE — and at a $265 pro price the pro cost is $265.00 — a dead heat, a TIE. With the fractional inputs the unrounded DIY cost is 287.475 and the unrounded win is 62.125 — they display as $287.48 and $62.13. What the model cannot do is price the risk: it says nothing about a ceiling box that will not hold the fixture, a fixture that will not sit level, or a pro who guarantees the work. It also says nothing about whether the pro quote includes the fixture — check that before you compare, or the comparison is wrong before it starts. Use it to see whether fitting the light fixture yourself saves money — then check the electrician and ceiling-fan comparisons before you decide the whole room is a DIY job.

Frequently asked questions