How to estimate carpentry work by the opening and the foot
Finish carpentry is estimated in two units: openings (doors and windows, priced each) and linear feet (baseboard, casing, crown, priced per foot), with materials taken off at about 10 percent waste, labor figured from install rates like 20 feet of base per hour, and the total cost divided by one minus your target margin. A three door trim-out package priced this way commonly quotes $4,500 to $6,500. The material grade decision, MDF versus pine versus poplar, moves the number more than most carpenters expect.
Step by step
- Count the openings first. Every door and window is an opening with its own package: a prehung interior door runs about $148 in materials, a solid core about $245, plus a lockset ($24 passage, $29 privacy) and casing both sides. Count them room by room and note swing, size, and hardware finish. Openings are the anchor lines; the linear feet hang off them.
- Measure trim in linear feet, by profile. Run the perimeter of each room for baseboard, each opening for casing, and each ceiling for crown, keeping profiles separate because MDF base at $1.38 a foot and poplar crown at $4.35 a foot are different lines. Subtract door widths from base runs but do not get greedy; closets and returns eat footage back. Write footage per room so the estimate survives a scope change.
- Pick the material grade with the customer, in writing. MDF is the paint-grade value play, pine takes stain but costs half again more, and poplar or oak crown doubles the line. Show the grade on the estimate: 264 feet of base in MDF is $364, and the same run in pine at $2.15 is $568. Locking the grade at signing kills the most common finish carpentry dispute before it starts.
- Add 10 percent waste and round to stock lengths. Miters, copes, bad corners, and short offcuts consume about 10 percent of trim stock, more in rooms with many corners. Trim sells in fixed lengths, so 250 needed feet becomes 264 ordered feet becomes seventeen 16 foot sticks. Waste is a line in the price, not a surprise in the truck.
- Figure labor from install rates you actually hit. Working rates for a solo finish carpenter: hang and case a prehung door in about 2 hours, run 20 to 30 feet of base per hour, 10 to 15 feet of crown per hour since crown is slower and often two-person. Multiply by a loaded rate, wages plus burden plus the trailer of tools, often $70 to $85 an hour. Out-of-square old houses drop every rate by a third.
- Price the consumables kit. Finish nails at $4.60 a pound, wood filler and caulk at $4.60 each, glue, and shims typically add $40 to $80 to a trim package. Put them on the estimate as a materials line so they stop leaking out of profit. If you also paint or the painter is separate, say which, because caulked-and-puttied versus paint-ready are different amounts of your time.
- Divide by your margin, then gut-check per unit. Materials plus labor is cost; the quote is cost divided by (1 minus margin), so 35 percent margin means dividing by 0.65. Then check the units: if a hung, cased, hardware-fitted door lands under $350 installed or base under $6 a foot installed, something got skipped. The divide-not-multiply rule matters here because finish carpentry is labor-heavy and markup errors compound on labor.
- State exclusions and send the estimate that day. Exclude painting, drywall repair behind removed trim, and correcting badly out-of-plumb framing unless priced. Note lead-safe RRP rules if you are disturbing painted surfaces in pre-1978 homes. Then send a line-item estimate the customer can e-sign from a text, because the carpenter with the clear same-day number gets the job over the one with the better miter and the slower quote.
The finish carpentry pricing formula
(Linear feet times price per foot times 1.10 waste) plus (openings times the per-opening package) plus the consumables kit equals materials; install hours times your loaded rate equals labor; the quote equals (materials plus labor) divided by (1 minus target margin). At a 35 percent margin you divide by 0.65, and that is not the same as multiplying by 1.35: the multiplied version prices $3,510 of cost at $4,739 instead of $5,400 and hands the difference to the customer. Margin lives on the selling price; markup lives on cost.
A trim-out package: three prehung interior doors at $148 is $444 plus $72 in passage levers, 264 feet of MDF baseboard (240 needed plus 10 percent waste) at $1.38 is $364.32, 120 feet of MDF casing at $1.28 is $153.60, 240 feet of shoe molding at $0.77 is $184.80, and nails, filler, and caulk add about $41. Materials come to roughly $1,260. Hanging doors at two hours each and running trim at about 20 feet an hour puts labor at 30 hours, which at a $75 loaded rate is $2,250. Job cost is $3,510. Divide by 0.65 for a 35 percent margin and the quote is exactly $5,400.
Cost factors carpenters price for
Material grade
MDF, pine, poplar, and hardwood span a fourfold price range on the same profile, and stain-grade work also raises labor because filler and caulk stop being options. Get the grade chosen and signed before ordering. A grade upgrade after signing is a change order, not a favor.
House squareness and age
Old houses with wavy plaster, out-of-level floors, and racked openings turn every cope and miter into a fitting exercise. Scribing base to a dipping floor can halve your feet-per-hour. Walk the worst room before you commit to production rates.
Crown and ceiling work
Crown is the slowest trim: compound miters, two-person holds on long runs, and staging on tall ceilings. Vaulted transitions and stacked build-ups multiply hours again. Price crown at its own labor rate, never blended with base.
Stairs and railings
Stair parts are premium units: oak treads at $43 each, balusters near $9.60, newel posts around $96, and handrail at $8.60 a foot, with code dictating baluster spacing (a 4 inch sphere must not pass) and rail height. The layout and code compliance hours exceed the install hours. Bid stair work as its own scope with its own margin.
Occupied home protection
Working in a furnished house adds floor protection, dust control, and daily cleanup, and a miter station in the garage instead of the room adds walking miles. Add 10 to 15 percent to labor in occupied homes. Dust complaints are the top review-killer for finish carpenters.
Frequently asked questions
What should I charge to hang an interior door?
For a prehung door supplied, hung, cased both sides, and fitted with hardware, most finish carpenters charge $350 to $550 all-in, driven by a $148 to $245 material package and about two hours of skilled labor plus margin. Slab-only swaps into existing jambs price lower but take longer than people think when hinge mortises need work. Price doors as complete packages, not as an hourly mystery.
How much margin should carpentry work carry?
Finish carpentry is labor-dominant, and the overhead behind that labor (insurance, the trailer of tools, blades, unpaid punch visits) typically runs 15 to 25 percent of revenue before profit. Aim for a 35 to 40 percent gross margin, dividing cost by 0.60 to 0.65. Thin 10 percent pricing on labor-heavy work is the fastest route to earning less than the helper.
MDF or wood trim, and how much does it change the price?
MDF base at about $1.38 a foot against pine at $2.15 means a 250 foot house differs by roughly $200 in material alone, and stain-grade poplar or oak widens the gap further while also raising labor. MDF paints beautifully and stays stable indoors but hates moisture and dents. Pick by room use and finish plan, and put the chosen grade on the signed estimate.
How much waste should I figure on trim?
Ten percent covers miters, copes, and offcuts in normal rooms; go 15 percent in rooms with many corners, angled walls, or long runs that force joints at specific spots. Trim also sells in fixed stick lengths, so round your order up to full lengths. Bidding trim at exact measured footage guarantees the shortfall comes out of your pocket and your schedule.
What is the fastest way to get a carpentry estimate out?
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