DIY vs Hire Faucet Installation: Which Is Cheaper?

Is fitting a faucet yourself worth it?

On the defaults — a $120 faucet, $45 of supplies and 2 hours at $35 an hour — the DIY cost is $235.00 against a pro cost of $350.00, so DIY wins by $115.00. Labour is often half the pro price or more, which is why doing it yourself saves so much — but a pro fits a faucet in an hour or two while a first-timer working under a sink, on their back, with a basin wrench, can take a whole afternoon, and a kitchen out of action means eating out. A $120 faucet with $45 of supplies is a typical mid-range DIY kit, and a typical single-faucet job commonly lands between $200 and $400 for labour, with the faucet itself on top.

Three things about the model are worth stating plainly.

First, the DIY cost is $120 + $45 + 2 × $35 = $235.00. Second, the pro cost is the flat pro price, $350.00. And third, DIY wins when the DIY cost is below the pro cost, hiring wins when it is above, and equal costs are a dead heat; all listed in Accuracy & limitations.

The worked example, line by line

Setup: faucet price $120, supplies $45, hours 2, hourly value $35, pro price $350.

Line 1 — the DIY cost. The DIY cost is $120 + $45 + 2 × $35 = $235.00.

Line 2 — the pro cost. The pro cost is the flat pro price, $350.00.

Line 3 — the gap. The gap is $350.00 − $235.00 = $115.00.

Line 4 — the verdict. The DIY cost is below the pro cost, so DIY wins by $115.00.

Line 5 — the check. At an hourly value of $93 the DIY cost is $351.00 and hiring wins by $1.00; and at $92 it is $349.00 and DIY wins by $1.00.

Every branch, checked

Hours 1: DIY $200.00; pro $350.00 — DIY wins by $150.00 — With 1 hour the DIY cost is $200.00 and DIY wins by $150.00.

Hours 4: DIY $305.00; pro $350.00 — DIY wins by $45.00 — With 4 hours the DIY cost is $305.00 and DIY wins by $45.00.

Faucet $250: DIY $365.00; pro $350.00 — Hiring wins by $15.00 — With a $250 faucet the DIY cost is $365.00 and the pro wins by $15.00.

Faucet $80: DIY $195.00; pro $350.00 — DIY wins by $155.00 — With an $80 faucet the DIY cost is $195.00 and DIY wins by $155.00.

Supplies $90: DIY $280.00; pro $350.00 — DIY wins by $70.00 — With $90 of supplies the DIY cost is $280.00 and DIY wins by $70.00.

Hours 3: DIY $270.00; pro $350.00 — DIY wins by $80.00 — With 3 hours the DIY cost is $270.00 and DIY wins by $80.00.

Hourly $50: DIY $265.00; pro $350.00 — DIY wins by $85.00 — With an hourly value of $50 the DIY cost is $265.00 and DIY wins by $85.00.

The reverses, worked backwards

Smallest whole-dollar hourly value where hiring WINS: At the displayed $93 the figures are DIY $351.00; pro $350.00 — Hiring wins by $1.00. At $93 the DIY cost is $351.00 and hiring wins by $1.00. At $92 the DIY cost is $349.00 and DIY wins by $1.00 — there is NO tie here, because $92.50 an hour is not a whole dollar — so $93 is the smallest whole-dollar hourly value where hiring wins.

Largest whole-dollar hourly value where DIY still wins by at least $50.00: At the displayed $67 the figures are DIY $299.00; pro $350.00 — DIY wins by $51.00. At $67 the DIY cost is $299.00 and DIY wins by $51.00. At $68 the DIY cost is $301.00 and DIY wins by only $49.00 — so $67 is the largest whole-dollar hourly value where DIY still wins by at least $50.00.

Smallest whole-dollar faucet price where hiring WINS: At the displayed $236 the figures are DIY $351.00; pro $350.00 — Hiring wins by $1.00. At $236 the DIY cost is $351.00 and hiring wins by $1.00. At $235 the DIY cost is $350.00 — a dead heat, a TIE, not a hiring win — so $236 is the smallest whole-dollar faucet price where hiring wins.

Smallest whole-hour hours where hiring WINS: At the displayed 6 hours the figures are DIY $375.00; pro $350.00 — Hiring wins by $25.00. At 6 hours the DIY cost is $375.00 and hiring wins by $25.00. At 5 hours the DIY cost is $340.00 and DIY wins by $10.00 — so 6 hours is the smallest whole-hour hours where hiring wins.

Smallest whole-dollar supplies where hiring WINS: At the displayed $161 the figures are DIY $351.00; pro $350.00 — Hiring wins by $1.00. At $161 the DIY cost is $351.00 and hiring wins by $1.00. At $160 the DIY cost is $350.00 — a dead heat, a TIE, not a hiring win — so $161 is the smallest whole-dollar supplies where hiring wins.

Smallest whole-dollar pro price where DIY wins at all: At the displayed $236 the figures are DIY $235.00; pro $236.00 — DIY wins by $1.00. At $236 the pro cost is $236.00 and DIY wins by $1.00. At $235 the pro cost is $235.00 — a dead heat, a TIE, not a DIY win — so $236 is the smallest whole-dollar pro price where DIY wins at all.

A warning about the neighbours: every neighbour above sits one dollar from the star, and the DIY cost is linear in every input, so every reverse has an exact closed form: the hourly value where hiring wins is the pro price minus the faucet and supplies, divided by the hours; the faucet price where hiring wins is the pro price minus the supplies and the hours times the hourly value; the supplies where hiring wins is the pro price minus the faucet and the hours times the hourly value; and the pro price where DIY wins at all is the DIY cost plus one dollar.

What the defaults assume

The defaults are a $120 faucet, $45 of supplies, 2 hours at $35 an hour and a $350 pro price — DIY $235.00; pro $350.00 — DIY wins by $115.00. With Hours 1, DIY $200.00; pro $350.00 — DIY wins by $150.00. With Hours 4, DIY $305.00; pro $350.00 — DIY wins by $45.00. With Faucet $250, DIY $365.00; pro $350.00 — Hiring wins by $15.00 — the pro wins by $15.00. With Faucet $80, DIY $195.00; pro $350.00 — DIY wins by $155.00. With Supplies $90, DIY $280.00; pro $350.00 — DIY wins by $70.00. With Hours 3, DIY $270.00; pro $350.00 — DIY wins by $80.00. With Hourly $50, DIY $265.00; pro $350.00 — DIY wins by $85.00. With All zero, DIY $0.00; pro $0.00 — exact tie — a dead heat, a TIE. With Faucet $90, supplies $30, hours 1.5, hourly $30, pro $300, DIY $165.00; pro $300.00 — DIY wins by $135.00. With Faucet $112.45, supplies $38.30, hours 2.5, hourly $32.75, pro $289.60, DIY $232.63 (unrounded 232.625); pro $289.60 — DIY wins by $56.98 (unrounded 56.975) (unrounded DIY 232.625, unrounded win 56.975) — the DIY cost is 232.625 unrounded, displayed $232.63 after half-up rounding, and the win is 56.975 unrounded, displayed $56.98. With Faucet $400, supplies $120, hours 5, hourly $60, pro $500, DIY $820.00; pro $500.00 — Hiring wins by $320.00 — the pro wins by $320.00. With Hours 0, DIY $165.00; pro $350.00 — DIY wins by $185.00. With Hours 2.5, DIY $252.50; pro $350.00 — DIY wins by $97.50. With Win-by bars, supplies for a $100.00 DIY win $60; faucet price for a $150.00 DIY win $85; hours for a $10.00 DIY win 5.

A note on the rounding: the DIY cost and the win are displayed to two decimals, half-up. At a $112.45 faucet, $38.30 of supplies, 2.5 hours and $32.75 an hour the unrounded DIY cost is 232.625 — it displays as $232.63 — and the unrounded win is 56.975 — it displays as $56.98. The page prints the unrounded values so the rounding does not mislead you.

Output · formula · meaning

Who uses this

• The homeowner with a dripping tap: they learn a $120 faucet fitted themselves costs $235.00 against a $350.00 pro quote — and they check the $93 reverse to see the hourly value where hiring wins.
• The renter replacing a dated faucet: they learn the supply list is short — supply lines, tape, a basin wrench, sealant and putty — and they check the $236 reverse to see the faucet price where hiring wins.
• The first-timer under the sink: they learn to shut the supply valves off and check the sink’s holes before buying — and they check the 6-hour reverse to see the hours where hiring wins.
• The budgeter weighing the afternoon: they learn 2 hours at $35 an hour is $70 of their own time — and they check the $67 reverse to see the hourly value where DIY still wins by at least $50.00.

Accuracy & limitations

The math is first-principles: the DIY cost is the faucet price plus the supplies plus the hours times your hourly value; the pro cost is the flat pro price; DIY wins when the DIY cost is below the pro cost, hiring wins when it is above, and equal costs are a dead heat — all in dollars, displayed to two decimals half-up. At $0 faucet, $0 supplies, 0 hours and $0 hourly value the DIY cost is $0.00 and the pro cost is $0.00 — a dead heat, a TIE. At a $235 faucet the DIY cost is $350.00 — a dead heat, a TIE, not a hiring win — and at $236 it is $351.00 and hiring wins by $1.00. At $160 of supplies the DIY cost is $350.00 — a dead heat, a TIE, not a hiring win — and at $161 it is $351.00 and hiring wins by $1.00. At a $235 pro price the pro cost is $235.00 — a dead heat, a TIE, not a DIY win — and at $236 it is $236.00 and DIY wins by $1.00. At $92 an hour the DIY cost is $349.00 and DIY wins by $1.00, and at $93 it is $351.00 and hiring wins by $1.00 — there is NO tie here, because $92.50 an hour is not a whole dollar. What the model cannot do is judge the job: it says nothing about whether the supply valves shut off cleanly, whether the faucet matches the sink’s holes, or whether the sink is stone — a 1-hole faucet does not fit a 3-hole sink without a cover plate, and a 4-inch spread does not fit an 8-inch spread. Water off is the one rule that overrides everything: shut the supply valves off under the sink and open the taps to drain the lines before touching anything. Do not overtighten: supply-line nuts and mounting nuts need to be snug, not crushed — overtightening cracks the fitting and strips the thread, and the leak shows up the next morning. The risks of doing it yourself: a cross-threaded supply line, a leaking connection under the sink, a faucet that does not match the sink’s holes, and a mounting nut you cannot reach without the right wrench. Fitting a faucet is worth doing yourself when the supply valves shut off cleanly, the faucet matches the sink’s holes, and you are comfortable on your back under a sink with a basin wrench. A pro is worth it when the shut-off valves are seized or corroded, the supply lines need replacing, the sink is stone, or there is already water damage under the cabinet — most pro jobs carry a labour warranty the DIY route does not. Use it to compare the two prices — then check the valves and the holes before you buy.

Frequently asked questions