Window and door installation cost comes down to two lines: the unit and the labour, and every quote should show both. The unit itself runs $150 to $1,200 for windows and $400 to $2,000 for doors, with labour on top at $100 to $300 per window and $150 to $400 per door. That arithmetic is the whole job. It prices a quote quickly.
What window and door installation cost actually includes
Installation cost covers the unit, the labour, flashing, sealant, interior trim and disposal of the old unit. The standard unit is one window or one door.
Excluded is structural repair, framing modification and paint or finish work, unless the quote says otherwise.
Flashing and sealant run $20 to $50 per opening. Trim runs $30 to $100, and disposal runs $10 to $30.
A typical four-window, one-door project installs five units. Five is a manageable test job.
Per-unit pricing normalizes for size. A five-unit job and a twenty-unit job compare honestly.
Where does glass sit on that list? Replacing the glass in a window prices as its own job, and a sound frame keeps it far below a full replacement.
The performance spec moves the unit price before anything else. Window energy ratings decide which grade you are buying, so read them before comparing quotes.
A single window lands around $310 to $1,680 installed. A single door lands around $610 to $2,580.
Unit and labour, priced separately by window and door type
Window pricing splits two ways. One is swapping the glass inside a sound frame. The other is replacing the whole window.
Choosing between double-hung and casement changes the hardware and the price, because the operation is part of the unit.
A standard vinyl double-hung window runs about $310 to $1,000 installed. A casement with its crank hardware runs about $350 to $1,200.
A single-hung window runs about $280 to $800 installed. A sliding glass door runs about $800 to $2,500.
Entry doors price by skin. Steel runs about $600 to $1,500 installed, fiberglass about $800 to $2,200, and wood about $1,000 to $3,000.
Interior doors are a different trade. The labour is mostly carpentry, because there is no flashing and no weatherstrip to install.
A prehung interior door runs $235 to $1,110 for a DIY install and $385 to $1,610 professionally. A slab is cheaper, because the frame stays.
Installing a prehung interior door and installing a door slab both show exactly what that labour line buys.
Hourly rates run $50 to $75. One unit takes roughly two hours to install.
Why Bob Vila, This Old House and HomeAdvisor all disagree
The published estimates genuinely conflict. Here is the spread, source by source, because the conflict is the useful part.
Bob Vila puts replacing glass in a window at $180 to $411 typically, with a national average of $281, and individual replacements as little as $100 or as much as $700.
This Old House puts the same job at $300 to $880 per window installed, with a $375 average, and puts reglazing at $250 to $500 per window.
Fixr matches that band, $300 to $880 including labour, with most homeowners spending about $375 on clear glass in a standard 30 by 36 inch double-pane window.
HomeAdvisor instead puts professional replacement at $181 to $414 per window, averaging $285, with float glass at $150 to $400 and tempered at $200 to $600.
A frame swap adds $180 to $600. That is where the two bands split.
Why the gap? Scope is defined differently. Some sources price a glass swap in a sound frame. Others price a full window.
Glass type, thickness, size, access and local labour rates do the rest. No source publishes its sample, so treat each figure as a band, not a price list.
HomeAdvisor puts a new window installation project at an average of $7,348, with most jobs between $3,436 and $11,839.
Fixr places most installed windows between $300 and $2,200, averaging $1,047 for one replacement window, and puts a ten to fifteen window project at $6,500 to $18,650.
This Old House reports $517 per installed window and $7,183 per project, from a survey of 1,000 window customers.
Which number is right? None, and all of them. Five scopes, five answers. Read the scope first.
Per-window figures cover one opening at a time. Project figures bundle many openings, plus whatever the house threw at the crew.
Modernize reports a $1,047 national average per window across more than a million homeowner projects. A single replacement window is the cheapest test of how a contractor prices.
What moves a quote: rough opening rot, second-story access and trim
Before the unit, the opening gets inspected. That inspection is where quotes diverge.
Rough opening condition moves the quote first. Rot, frame damage or an out-of-square opening needs repair before the new unit goes in, and that adds $200 to $600 per opening.
Then floor level. First-story installations are standard. Second-story access needs a lift and adds $100 to $300 per unit.
Then trim. Basic paint-grade casing is usually included. Custom millwork adds $100 to $400 per opening. Stained trim lands in the same band.
None of those show up in a per-unit price. A quote that omits them is quoting the easy version of your house.
For a door, labour buys the fit. Hinge placement, the reveal, the latch meeting the strike. Get one wrong, and the door never closes right.
For a window it buys flashing and drainage. Those are the two things that fail later, not the glass.
Five numbers to check before you sign a window or door quote
A buyable quote lists the unit, the size, the material, the grade, the labour per unit, the flashing and sealant, the interior trim, the disposal and the warranty.
Walk away from any quote that says replace all windows and doors with no breakdown. That is not a price, it is a shrug.
Then check the five numbers that decide a quote: how many units, what material and grade, what labour rate, what flashing and trim allowance, and what disposal costs.
Those five numbers explain every figure above.
The wider map lives in the windows and doors guide, and DIY versus professional door installation is where the skill question gets decided honestly.
Next step: get the unit and the labour priced separately, then compare two quotes line by line. That is how to choose a fair installer before you commit.
