Curved plaster walls and ceilings are built by shaping the frame first, then lining it with plasterboard that's bent to fit, either thin flexible board for tight curves or standard board for gentle ones. They look seamless when done well, but they take more time, more framing and more finishing skill than flat walls, so they cost more per square metre.
Straight lines and square corners have been the default in Australian homes for decades. But curves are having a moment. Arched doorways, rounded feature walls and soft-edged ceilings can make a space feel calmer, more custom and more architectural. The good news is that plasterboard can create these shapes without the cost of solid render or custom joinery.
Popular ways to use curves
- Arched openings and doorways between living areas, hallways and kitchens
- Curved feature walls, such as a rounded wall wrapping a staircase or entry
- Rounded wall ends and corners for a softer look in hallways and living spaces
- Barrel-vaulted and curved ceilings in hallways, dining rooms and alfresco areas
- Curved bulkheads that soften a kitchen or hide services with a flowing line
- Column encasements in commercial lobbies and open-plan homes
- Reception desks and feature walls in office fitouts
How curved plaster walls are built
1. Framing the curve
The shape starts with the frame. Steel framing is often used because the top and bottom track can be cut and bent to follow the curve, then studs are set closer together than on a flat wall so the board is supported along the arc. Timber framing can be curved too, using shaped plates. For curved ceilings, a framework of curved battens or a suspended grid creates the profile.
Getting the frame right is the most important step. Any flat spots or kinks in the framing will show through the finished plaster.
2. Choosing and bending the board
There are two main approaches:
- Flexible plasterboard. This is a thin board (6.5 mm in the case of Gyprock Flexible) with a reinforced core and heavy-duty liner paper. It's usually installed in two layers for a total of about 13 mm, matching a standard wall. Gyprock states this can achieve a convex curve with a radius as small as 250 mm and a concave curve as small as 450 mm.
- Standard plasterboard. For gentle, large-radius curves, standard board can be bent, sometimes after lightly dampening the back so it flexes without cracking. This needs care and patience, and there's a limit to how tight it can go.
3. Fixing and finishing
Boards are fixed along the curve with closer screw spacing than a flat wall. Joints are then set, taped and sanded just like a normal wall, but the finisher has to follow the curve rather than a flat plane. Smooth, even curves rely on skilled hands and good lighting during sanding.
Curved corners and arches can also use flexible corner beads to keep a crisp, consistent edge.
Curved walls in new builds vs renovations
In a new build, curves are easiest to add during framing, before the walls are lined.
In a renovation, many curves can still be retrofitted. For example, an existing square doorway can be reframed into an arch, or a square wall end can be rounded off. Larger changes, like a curved wall replacing a straight one, may involve removing existing linings and reframing. If a wall is loadbearing, you'll need a builder or engineer involved before anything is changed.
What affects the cost
Curved work costs more than flat plastering, and it's worth understanding why:
- Radius: tighter curves need flexible board, more framing and more time.
- Size and complexity: a single arch is very different from a full curved ceiling or a compound curve.
- Framing: extra studs, curved track and careful setting out add labour.
- Finish level: curves are very visible under light, so a high-quality finish takes extra coats and sanding.
- Access: curved ceilings and stairwells may need scaffolding.
Ask for a quote based on drawings or clear measurements, and check whether framing, board, finishing and painting are all included.
Tips for a great result
- Plan lighting early. Uplights and grazing light show every ripple, so tell your plasterer if the curve will be lit from the side.
- Keep it consistent. Repeating the same radius in arches, corners and joinery makes a space feel designed rather than random.
- Think about furniture. Curved walls can be harder to furnish against, so curves often work best in hallways, entries and feature zones.
- Choose the right paint. A low-sheen or matte finish is more forgiving on curved surfaces than gloss.
Bring your curves to life in plaster
Sydney Wide Plastering builds curved plaster walls, arches, curved bulkheads and ceilings for homes and commercial spaces across Sydney. Whether you have architect's drawings or just a photo you love, we can help you work out what's achievable and how to build it.
Get in touch to talk about your project, and take a look at our gallery for inspiration.