How to Price Interior Painting: Stop Bidding by the Square Foot

Bidding interior painting strictly by the floor square footage guarantees you will lose money on prep-heavy jobs with tall ceilings or complex trim. You must learn how to price interior painting by calculating total wall surface area, estimating labor hours for drywall repair and masking, and multiplying by your hourly shop rate of at least $65/hour. Throw away your $2-per-square-foot rule of thumb and use this exact production-rate formula.

If you are throwing out bids based on the floor plan of a house, you are playing Russian Roulette with your profit margins. A 2,000-square-foot open-concept home with 8-foot ceilings and zero crown molding is a completely different job than a 2,000-square-foot 1920s Craftsman chopped into eight rooms with 10-foot ceilings, heavy wainscoting, and twelve French doors.

If you charge $5,000 for both, you'll make great money on the first and pay out of pocket to finish the second.

Here is exactly how to stop guessing and start estimating like a professional contractor.

The "Most Contractors Get This Wrong" Insight: The Sundries and Prep Bleed

Most contractors get this wrong: They meticulously calculate the cost of the actual paint, but they completely ignore the cost of sundries and the labor time to apply them.

I call this the "Prep Bleed." You look at a master bedroom and think, "That's two gallons of Sherwin-Williams Emerald at $70 a gallon, plus a day of labor. I'll charge $600."

You just forgot that your guy is going to use two rolls of green FrogTape ($20), half a roll of 3M hand masker film ($15), a tube of elastomeric caulk for the baseboards ($6), a fresh Purdy roller cover ($8), and a drop cloth that eventually needs replacing. That's $49 in materials you just ate out of your own profit margin.

Furthermore, masking that room, removing switch plates, dropping the ceiling fan canopy, and caulking the baseboards takes two hours before a single drop of paint hits the wall. At a $65 hourly shop rate, that's $130 in labor you didn't bill for. You didn't just miscalculate; you subsidized the homeowner's bedroom makeover.

Step-by-Step: How to Price Interior Painting

To build bulletproof estimates, you need to transition to a production-rate estimating system. This means you figure out exactly how long a specific task takes, and you multiply it by your shop rate.

Step 1: Calculate Total Wall Surface Area

Stop measuring the floor. You aren't painting the floor. You are painting the walls. You need to calculate the actual square footage of the drywall you are covering.

The Formula: (Linear Perimeter of the Room x Ceiling Height) - Openings.

Grab your laser measure. Shoot the length and width of the room.

• Example: A 15x20 room has a perimeter of 70 linear feet.
• Multiply by the ceiling height: 70 x 9-foot ceilings = 630 square feet of wall space.
• Subtract the openings: Standard doors are roughly 21 square feet. Standard windows are roughly 15 square feet. If this room has two doors and two windows, subtract 72 square feet.
• Net Wall Area: 558 square feet.

Step 2: Count the Cut-Ins and Obstacles

Rolling a wall is fast. Cutting in around trim, ceilings, and obstacles is what eats your labor budget. You need to measure the linear footage of your cut-in lines.

In that same 15x20 room:

• Ceiling line: 70 linear feet
• Baseboard line: 70 linear feet (minus the doors)
• Window and door casing: Roughly 17 linear feet per door, 15 per window.

You need to know exactly how many linear feet your brush has to trace.

Step 3: Estimate Prep and Drywall Repair Time

Walk the walls with a raking light (a flashlight held parallel to the wall). Count the nail pops, the anchor holes, and the corner bead cracks.

Do not throw in patching for free. If a room requires skim coating or multiple patches that require mud to dry before sanding, you must charge for that time. If you don't know how to price this phase, read our guide on How Much to Charge for Drywall Repair: Why Your $150 Patch is Bleeding You Dry.

Assign a hard hour count to prep. "This room requires 1.5 hours of masking and 1 hour of drywall patching."

Step 4: Calculate Material Coverage and Costs

Now that you have your Net Wall Area, calculate your paint.

A standard gallon of premium interior acrylic latex (like Sherwin-Williams SuperPaint or Benjamin Moore Regal Select) covers roughly 350 to 400 square feet per coat over a primed or previously painted surface.

• Net Wall Area: 558 sq ft.
• Two coats required: 1,116 sq ft of coverage needed.
• 1,116 / 350 sq ft per gallon = 3.18 gallons.

You must buy 4 gallons. If your contractor pricing is $45 per gallon, your paint cost is $180.

Crucial Step: Add 15% to your total material cost for sundries (tape, plastic, roller covers, caulk).

• $180 x 1.15 = $207 Total Material Cost.

Step 5: Apply Your Production Rates and Hourly Shop Rate

You need to know how fast your crew works. If you don't know, use these industry-standard production rates as a baseline until you track your own:

• Rolling walls: 150 square feet per hour (per coat)
• Cutting in (brush work): 25 linear feet per hour
• Painting doors (brush and roll): 45 minutes per side
• Painting baseboards: 30 linear feet per hour

Once you have your total hours, multiply by your hourly shop rate.

Your shop rate is NOT what you pay your painter. If you pay a painter $25/hour, their labor burden (taxes, workers comp) makes them cost $32/hour. Add your business overhead (van, insurance, tools, marketing) and you are at $45/hour. To achieve a healthy 30% to 50% gross profit margin, your minimum hourly shop rate to the customer must be between $65 and $85 per hour.

What This Looks Like on a Job: The Master Bedroom Breakdown

Let's put the entire system together to show you exactly how to price interior painting in the real world. We will use the 15x20 master bedroom with 9-foot ceilings from our previous steps.

The Specs:

• Floor Area: 300 sq ft
• Net Wall Area: 558 sq ft
• Cut-in linear footage: 210 linear feet
• 2 doors, 2 windows, standard baseboards.
• Empty room (no furniture to move).

The Labor Math:

• Masking and Prep: 1.5 hours
• Drywall minor patching/sanding: 0.5 hours
• Rolling walls (2 coats = 1,116 sq ft): 1,116 / 150 sq ft per hour = 7.4 hours
• Cutting in (2 coats = 420 linear ft): 420 / 25 linear ft per hour = 16.8 hours
• Wait, 16.8 hours just for cutting in? Yes. This is why painters lose money. Cutting in two coats around ceilings, baseboards, and four openings takes immense time. (Note: Highly skilled painters can cut in at 40 lf/hr, which drops this to 10.5 hours. We will use 10.5 hours for a skilled mechanic).
• Total Labor Hours: 19.9 hours

The Pricing Math:

• Labor: 19.9 hours x $65/hr shop rate = $1,293.50
• Materials (Paint + Sundries): $207.00
• Total Price to Customer: $1,500.50

If you had used the amateur "$2.50 per square foot of floor space" rule, you would have charged $750 for this room. You would have spent $207 on materials, leaving $543 for 20 hours of work. That's $27 an hour—meaning after overhead and taxes, your business actually lost money on the job.

This exact estimating discipline is what separates the guys driving 15-year-old rusted vans from the guys running profitable fleets. It's the same math you must apply to exterior work, as detailed in our breakdown of The $5,000 Exterior Paint Job: Material and Labor Breakdown.

Variables That Increase Your Price

Not all square footage is created equal. When estimating how to price interior painting, you must apply multipliers for conditions that slow down your production rates.

1. Occupied Rooms (The Furniture Tax)

If a homeowner is living in the house and the room is full of furniture, your production rate plummets. You have to move the bed, drape the dressers in plastic, carefully navigate around heirlooms, and move everything back at the end of the day. The Fix: Add a 15% to 20% labor markup to any occupied room. Explicitly state on the quote: "Includes heavy furniture manipulation and protective covering."

2. Drastic Color Changes

Painting a stark white wall over a dark crimson red wall will not cover in two coats of standard paint. You will either need a high-hiding stain-blocking primer (like Kilz Premium or Zinsser Bulls Eye 1-2-3) followed by two topcoats, or three coats of premium paint. The Fix: Calculate the square footage for THREE coats of application, not two.

3. Vaulted Ceilings and Stairwells

Any time a painter's feet leave the ground, production slows down by at least 30%. Moving ladders, setting up Baker scaffolds, or using extension poles requires more physical energy and time. The Fix: Measure the wall area above 10 feet. Apply a 1.5x multiplier to the labor hours required for those specific high square footages. Also, add the daily rental cost of any specialty scaffolding directly to the material estimate.

4. Nicotine, Water Damage, or Heavy Greases

Standard acrylic paint will not block nicotine stains or water rings; they will bleed right through the fresh paint as it dries. These walls require a full coat of solvent-based primer (oil or shellac, like BIN). Oil primers are harder to apply, ruin roller covers, require mineral spirits for cleanup, and require respirators. The Fix: Price the primer application at a slower production rate (100 sq ft/hr), double your sundries budget for ruined applicators, and charge a premium for hazardous material handling.

How to Price Interior Trim and Doors

Walls are priced by the square foot of surface area. Trim is priced by the linear foot or by the unit. Do not lump trim into your wall square footage price.

Here are baseline targets for pricing trim at a $65/hr shop rate (assuming one coat of prep/caulk and two coats of semi-gloss enamel):

• Standard Baseboards (up to 4 inches): $1.50 to $2.25 per linear foot.
• Crown Molding: $2.50 to $3.50 per linear foot (requires ladder work).
• Standard 6-Panel Doors (Faces and Jambs): $85 to $120 per door.
• French Doors (multi-pane): $150 to $200 per door (masking 15 individual panes of glass takes an hour per door alone).

If a client wants you to paint their 90s honey-oak kitchen cabinets white, that is a completely different trade specialty involving deglossing, bonding primers, and HVLP sprayers. Do not price cabinets by the square foot. Price them by the door/drawer front (typically $120-$150 per opening).

The Next Step

Stop guessing your prices in the driveway. Tomorrow morning, open a blank spreadsheet. In column A, list your standard tasks (Masking, Drywall Prep, Rolling Walls, Cutting In, Painting Trim). In column B, input the production rates provided in this article. In column C, lock in your hourly shop rate of at least $65/hour.

On your next estimate, bring a laser measure, calculate the exact wall surface area, plug the numbers into your new spreadsheet, and send the bid. It will be higher than your old bids. You will lose the cheap clients, win the professional clients, and finally start making a 40% profit margin on your interior painting jobs.