Understanding how to calculate a painting estimate is one of the most important steps when planning a residential or commercial painting project. Whether you’re a homeowner in Portsmouth, a landlord in Nashua, or managing a storefront in Dover, having a clear and realistic estimate helps prevent surprises, avoid overspending, and ensure the job gets done right.
At Reis Painters, we believe in total transparency—from paint prep to pricing. That’s why we’ve broken down exactly how an estimate is calculated, so you can better understand the process and make informed decisions before your next painting project in New Hampshire.
1. Measure the Area to Be Painted
Every estimate starts with precise measurement.
- Measure the length and height of each wall or surface.
- Multiply length × height to get square footage.
- Subtract any windows, doors, or large openings from your total.
- Add up all areas to get the complete paintable surface.
Example:
A wall that’s 12 ft wide and 8 ft tall = 96 sq. ft.
Four walls = 384 sq. ft. of surface area.
This number is the foundation of the estimate—it directly impacts how much paint, labor, and prep time your project will require.
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2. Calculate Paint Coverage
One gallon of paint typically covers 350–400 sq. ft., depending on the surface type and paint quality.
- Divide total square footage by the paint coverage to determine how many gallons are needed.
- Always round up.
- Add an extra 10% for touch-ups or miscalculations.
Example:
384 sq. ft. ÷ 350 = 1.1 gallons → round up to 2 gallons.
If your walls are textured or absorbing more paint (e.g. raw drywall, masonry), you may need even more.
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3. Determine Number of Coats
Most high-quality jobs require two coats of paint—especially if you’re covering dark colors or painting high-traffic areas.
- Multiply your paint quantity by the number of coats.
- Don’t forget primer if painting over raw surfaces, stains, or bold existing colors.
Rule of Thumb:
Always plan for 2 coats + 1 primer coat when repainting or changing color drastically.
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4. Paint Cost
Your paint type will significantly impact your final price.
- Multiply the number of gallons needed × price per gallon.
- Premium paints cost more (typically $45–$70 per gallon), but they offer better coverage, durability, and finish.
Example:
4 gallons × $45 = $180 in paint.
At Reis Painters, we only work with premium lines from Sherwin-Williams or Benjamin Moore, ensuring your investment lasts longer.
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5. Supplies and Equipment
A professional-grade finish requires more than just paint.
Common Supplies:
- Brushes, rollers, trays, painter’s tape
- Drop cloths and plastic sheeting
- Caulk, sanding tools, patching compound
- Ladder or scaffolding rental (if needed)
Estimated Cost:
$50–$150 depending on the size and complexity of the job.
For two-story homes in Exeter or older properties in Concord, equipment and prep often take more time and resources.
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6. Labor Costs in NH
This is often the largest portion of the estimate.
Local Labor Averages:
- $2–$6 per sq. ft.
- Or $25–$75 per hour
Factors That Influence Labor Rates:
- Surface prep (sanding, patching)
- Furniture moving
- Number of coats
- Ladder work or restricted access
- Travel or staging time
Example:
384 sq. ft × $3 = $1,152 in labor
At Reis Painters, we provide flat-rate pricing whenever possible to eliminate uncertainty—especially for full interiors or exterior jobs.
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7. Overhead & Profit (for Contractors)
If you’re reviewing estimates from contractors or generating your own as a professional:
- Add 10%–20% to cover overhead (insurance, fuel, licensing) and profit margin.
- This ensures the business remains sustainable without hidden upcharges later.
Example:
$1,440 base job → 15% overhead = $216
Total = $1,656
At Reis Painters, this is always built into the estimate transparently—we don’t tack on mystery fees.
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8. Final Estimate Example
Let’s bring it all together:
| Item | Cost |
|---|---|
| Paint | $180 |
| Supplies | $100 |
| Labor | $1,152 |
| Overhead (15%) | $216 |
| Total | $1,648 |
This estimate reflects a moderate-sized interior paint job, with two coats, premium materials, and professional labor. Larger homes, exteriors, or more detailed trim work will naturally cost more.
Pro Tips for New Hampshire Homeowners
- Inspect the surfaces before estimating — peeling paint, water stains, or cracks require extra time and materials.
- Document your estimate — list paint types, number of coats, prep work included.
- Request two packages — standard vs premium, so you can compare cost vs longevity.
- Don’t underbid your project — it’s better to slightly over-estimate than to get caught off guard by hidden costs.
Get a Professional Estimate from Reis Painters
If you’re located in Southern New Hampshire and want a clear, fair, and professional painting estimate—we’ll handle it for you.
Our team serves:
- Residential homes in Portsmouth, Exeter, Dover, Concord, Salem, and Nashua
- Local businesses and commercial properties
- Interior and exterior projects, all year round
