Semi-gloss paint typically costs $30-$80 per gallon, with many midrange interior products near $50. A professional painting job can run from a few hundred dollars for trim to more than $1,500 for a room, depending on surface area, prep, paint quality, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Interior semi-gloss paint | $30/gal | $50/gal | $80/gal | Brand, finish line, and washability affect price |
| DIY paint for one room | $60 | $120 | $240 | Two gallons, before tools and primer |
| Professional trim painting | $1/linear ft | $2.50/linear ft | $5/linear ft | Prep and trim condition change the rate |
| Professional room painting | $400 | $900 | $1,800 | Typical bedroom-size project, including labor |
Semi-gloss paint price by gallon and room size
For a standard interior product, buyers commonly pay $30-$55 per gallon at the lower and midrange, while premium washable formulas can reach $60-$80. One gallon often covers about 350-400 square feet for a single coat on a smooth, primed surface. Two coats, textured walls, or a color change can increase the quantity needed.
A 12-by-12-foot room with 8-foot ceilings has roughly 380 square feet of wall area before subtracting doors and windows. Two coats may take 2-3 gallons, or about $60-$240 in paint. A professional room quote commonly totals $400-$1,800 when it includes wall preparation, labor, and standard supplies.
Paint purchase price is only one part of the installed total. Assumptions: U.S. interior work, standard 8-foot ceilings, ordinary access, and no major repairs.
What labor and materials appear in a semi-gloss quote
A painting estimate may separate the coating from prep, application, and cleanup, or present one combined project price. Semi-gloss can highlight dents and brush marks, so surface preparation often matters more than it does with flatter finishes.
| Quote item | Typical price | What changes the charge |
|---|---|---|
| Semi-gloss paint | $30-$80 per gallon | Brand, quality, and stain resistance |
| Labor | $35-$75 per hour | Region, crew experience, and detail work |
| Light sanding and patching | $0.50-$2 per sq ft | Number and depth of surface defects |
| Primer | $20-$50 per gallon | Stains, bare wood, or a strong color change |
| Masking and cleanup supplies | $25-$100 per job | Room count and protection needs |
Trim painting may be priced by linear foot because doors, baseboards, and window casings require careful cutting and brushwork. Ask whether the quote includes sanding, caulking, primer, and a second coat.
How sheen, coverage, and surface prep change the price
Higher sheen does not automatically mean a higher price, but premium semi-gloss lines with better scrubbability or stain resistance often cost more. A difference of $10-$25 per gallon between product tiers is common. On a small room, that may add only $20-$75; across a whole home, the upgrade can add several hundred dollars.
Coverage also depends on the surface. Smooth, previously painted walls may approach 350-400 square feet per gallon per coat, while porous or heavily textured surfaces can use 250-300 square feet. If a project exceeds 500 square feet of wall area, one extra coat or a second color can require another gallon or more.
Prep is a major variable. Minor scuffing may add $50-$150 to a room quote, while extensive patching, glossy old paint, or peeling areas can add $200-$600 or more. On older trim, test adhesion and budget for sanding or bonding primer before counting on one-coat coverage.
How long does professional semi-gloss application take
A painter may spend 6-10 labor hours on a straightforward bedroom, including masking, basic prep, two coats, and cleanup. A two-person crew can finish much of the active work in one day, but drying time between coats can extend the schedule. Trim-heavy rooms, occupied spaces, and detailed doors take longer.
At $35-$75 per labor hour, 6-10 hours represents $210-$750 in labor before materials, overhead, and any minimum charge. Contractors may charge a $150-$300 minimum for a small job rather than bill only for a few hours. Get the estimated labor hours and included coat count in writing for small projects.
When trim, primer, and repairs add to the bill
Adding baseboards, doors, and window trim can cost roughly $1-$5 per linear foot, with elaborate profiles or damaged wood toward the high end. A typical room with 150-200 linear feet of trim could add $150-$1,000. Door painting may instead be quoted at $40-$100 per side, depending on condition and detail.
Primer is more likely to be needed on bare wood, patched areas, stains, or a major color transition. Replacing damaged trim, removing old caulk, or repairing water stains is generally outside a basic paint quote. Request separate line items for repairs and trim so optional work does not blur the base price.
Three semi-gloss painting quotes for common jobs
| Job example | Scope | Estimated total |
|---|---|---|
| DIY bedroom | 380 sq ft of walls, two coats, 2-3 gallons, basic supplies | $100-$300 |
| Professional bedroom | 380 sq ft of walls, light patching, two coats, 8 labor hours | $600-$1,200 |
| Trim refresh | 180 linear ft, light sanding, primer as needed, two coats | $450-$1,100 |
These examples assume ordinary access and surfaces in serviceable condition. A contractor may charge more in high-cost metros or where furniture moving, extensive masking, or repairs are included. Compare the same measured area, coat count, and prep scope when reviewing quotes.
Where to save on semi-gloss without sacrificing coverage
Measure wall or trim area before buying paint, and ask the store or painter to calculate gallons using the product’s stated coverage. Buying too little can create a color mismatch between batches, while buying excess leaves unused material. Keep a small labeled amount for touch-ups rather than purchasing extra gallons without a plan.
For sound, previously painted surfaces, cleaning and spot-priming may avoid a full primer coat. Choose a standard midrange paint if the room does not need premium stain resistance, but do not skip primer on bare wood or stains. Combining several rooms into one visit may also reduce separate trip or minimum charges.
Get two or three written estimates that identify paint brand or grade, number of coats, surface preparation, and disposal. The lowest quote is not comparable if it excludes sanding, primer, or trim protection.