A painted arch wall gives a flat wall a soft focal point, and you can draw a perfect curve with nothing more than a pencil, a string and a nail. The trick is to find the center point, pivot the string, and let the geometry do the work. This guide covers sizing, drawing, taping and painting.
Decide the Size and Placement
A painted arch wall looks best when the arch relates to something in the room. Behind a bed, around a desk, over a console table or framing a mirror are all popular spots. A simple guide is an arch about as wide as the furniture beneath it, with its top landing a little below the ceiling.
Many people paint the arch as a solid shape in an accent color. If you are still choosing a color, our accent wall ideas give you plenty of palettes to start from.
Materials You Will Need
| Item | Use |
|---|---|
| Tape measure and level | Mark the width and a true vertical |
| String (about half the arch width) and thumbtack or nail | Acts as a compass |
| Pencil | Draws the curve |
| Painter’s tape | Masks the edge |
| Small roller, angled brush | Fill and edge work |
| Wall paint, base and arch color | One coat of primer helps with dark colors |
How to Draw a Perfect Painted Arch Wall Curve
- Mark the width. Draw two vertical lines the exact width of your arch, using a level to keep them plumb.
- Find the radius. Half the width is the radius. If the arch is 36 inches wide, the radius is 18 inches.
- Locate the center point. Measure down from the intended arch top by the radius, and mark the center between the two vertical lines. That is where the curve starts.
- Pin the string. Push a thumbtack into the center mark and tie the string to it. Tie a pencil at the radius length.
- Draw the semicircle. Keep the string tight and swing the pencil in an arc from one vertical line to the other across the top.
- Complete the shape. Extend the vertical lines down to the floor, baseboard or a chosen height.
Tape, Seal and Paint
Tape on the outside of the line so the arch stays crisp. On curves, use a flexible tape, or tear short pieces and overlap them. The painter’s tape guide explains which tapes bend best.
Press the edge down, then brush a very thin coat of the wall color along the tape. This seals the edge, so any bleed matches the wall. Once dry, roll the arch color with light pressure and cut in along the curve with an angled brush; our guide on how to cut in paint along edges helps with steady brush control. Apply a second coat after the recoat time on the can.
Removing the tape
Peel at a low angle while the paint is slightly tacky. If it has dried hard, run a utility knife lightly along the edge first.
Style Variations
Try a double arch, with a smaller arch inside a larger one in two tones. Paint a half arch on a corner. Or extend the arch to the floor to read like a doorway. An arch is also a classic architectural form, see the arch overview for more on its shapes.
Safety note: ventilate the room while painting. If your home predates 1978, check for lead paint with a test kit before sanding or scraping, and use EPA-recommended lead-safe work practices if needed.
Choosing Arch Color and Finish
An arch reads best when there is clear contrast with the wall. Warm terracotta on a soft white wall, deep green on cream, or a muted blue on a pale grey all look grounded. If you want the shape to feel quiet, pick a color two shades darker than the wall instead of a sharp contrast.
Think about what will stand in front of the arch. A bed, a plant, or a mirror will cover part of it, so keep the color friendly to your bedding or decor. Paint a sample patch inside the drawn shape and look at it at different times of day before rolling the whole arch.
For a cleaner finish, work in one direction with the roller, and fill the arch in sections. Avoid going back over areas that have started to dry, since that can leave texture or dull spots in the middle of a bold color.
Frequently Asked Questions
How wide should a painted arch wall be?
Match it to the furniture or feature it frames. Roughly the width of a bed, desk or console is a dependable starting point.
Can I make a painted arch wall without a string compass?
Yes. For any painted arch wall, trace a large round object, or cut a cardboard template, though the string method is cheaper and scales to any size.
What paint finish should I pick?
Matte or eggshell for a soft modern look. A slightly higher sheen on the arch than the wall adds subtle contrast.
Will dark color on a white wall need primer?
Often one or two coats of a quality paint cover. Deep colors may need an extra coat, so check the label.
How do I fix a wobbly painted arch wall edge?
Let the paint dry, then touch up the painted arch wall edge with the wall color on a small brush, working along the line.
