How Much Paint for Shutters?
Louvred shutters have roughly twice the surface of their flat footprint. That is the whole story.
A typical house with 12 louvred shutters needs about 1 gallon of paint for two coats. The catch: a louvred shutter has roughly double the surface area of its flat outline, because of the angled slats. Measure the flat size, then double it.
Estimates only. Textured walls, high ceilings, sprayers and major colour changes can all increase the amount you need. Always buy slightly more than the calculation suggests.
Paint needed by number of shutters
| Room / surface | Surface | Coats | Paint | Paint cost |
|---|---|---|---|---|
| 4 shutters, one coat | 40 sq ft | 1 | 1 gal | $45 |
| 4 shutters, two coats | 40 sq ft | 2 | 1 gal | $45 |
| 12 shutters, one coat | 120 sq ft | 1 | 1 gal | $45 |
| 12 shutters, two coats | 120 sq ft | 2 | 1 gal | $45 |
| 12 shutters, both sides, two coats | 240 sq ft | 2 | 2 gal | $90 |
| 20 shutters, both sides, two coats | 400 sq ft | 2 | 3 gal | $135 |
Louvred shutters at roughly 10 sq ft of real surface each, one side, at 350 sq ft per gallon.
The louvre multiplier
A louvred shutter looks like a rectangle, but its surface is a series of angled slats — and you have to paint the top of each one and most of the underside.
The practical rule: take the flat width times height, then double it. A 15-inch by 59-inch shutter is about 6.1 square feet flat, but roughly 10 square feet of real surface once the louvres are counted.
Panel shutters are closer to flat and need much less. Raised-panel shutters sit between the two. If yours are louvred — which most exterior shutters are — use the doubling rule.
Preparation decides whether the job lasts
Shutters are the most exposed surface on a house: full sun, driven rain, and no protection. Preparation matters more here than almost anywhere else.
- Take them off the wall. Painting shutters in place is possible but you will miss edges, and the hardware gets covered. It is usually four screws per shutter.
- Clean and sand. Wash off dirt and mildew, let them dry completely, then scuff-sand the surface so the new paint has something to grip.
- Prime bare or weathered areas. Any spot where the old finish has failed needs primer, not just topcoat.
- Paint the edges. The top and bottom edges of a shutter take the most water. Most people skip them, and that is where rot starts.
- Let them cure before refitting. Handle them gently — fresh paint on edges marks easily.
Frequently asked questions
How much paint do I need for shutters?
About 1 gallon for 12 louvred shutters with two coats on one side. Double it if you are painting both sides.
How do I calculate paint for louvred shutters?
Measure the flat width times height, then double it to account for the angled slats. A 15x59 inch shutter is about 10 square feet of real surface.
Should I remove shutters to paint them?
Yes if you can. It is usually four screws each, and it lets you paint the edges properly — which is where shutters rot first if they are missed.
What finish should exterior shutters have?
Satin or semi-gloss exterior acrylic. Glossier finishes shed water better and clean more easily, but show surface imperfections more.