How to Wallpaper Around Corners | Tips for Neat Edges

Why Corners Are the Trickiest Part of Wallpapering

Corners are where most wallpapering projects go wrong. Whether you are tackling a feature wall that wraps around a corner or papering an entire room, the junction between two walls is rarely perfectly straight or square. Even in new BTO flats, corners can be slightly off-plumb — a deviation of just a few millimetres can cause wallpaper to crease, buckle, or go out of alignment.

The good news is that neat corners are achievable with the right technique. This guide covers both inside corners (where two walls meet to form a concave angle) and outside corners (where walls meet to form a convex angle), along with tips specific to Singapore homes.

Inside Corners: Step-by-Step Method

Inside corners are the most common type in any room. Here is the reliable method professionals use to handle them cleanly.

Step 1: Measure the Gap

Measure from the edge of the last full strip of wallpaper to the corner at three points — top, middle, and bottom. Corners are rarely perfectly plumb, so the distance may vary. Take the widest measurement and add 15mm to 20mm for an overlap onto the adjoining wall.

Step 2: Cut the Strip

Cut the next strip of wallpaper to the width you measured (plus the overlap). Keep the offcut — you will use it to start the adjoining wall.

Step 3: Apply to the Corner

Hang the cut strip so that it covers the remaining gap on the current wall and wraps around the corner with your 15mm to 20mm overlap. Press the wallpaper firmly into the corner with a smoothing brush or a seam roller. If the paper crinkles in the corner, make small relief cuts at the top and bottom to help it sit flat.

Step 4: Establish a New Plumb Line

On the adjoining wall, use a spirit level or plumb line to mark a true vertical line at a distance from the corner equal to the width of the offcut strip minus 10mm. This ensures the offcut overlaps the wrapped portion slightly while hanging perfectly vertical.

Step 5: Hang the Offcut

Apply the offcut strip to the adjoining wall, aligning it with your new plumb line. The edge nearest the corner will overlap the wrapped portion from the previous strip. Smooth it into place.

This overlap technique is the key to professional-looking inside corners. Attempting to wrap a full-width strip around an inside corner almost always results in wrinkles and misalignment.

Outside Corners: Step-by-Step Method

Outside corners — such as those around pillar columns or protruding walls — are more visible and therefore require extra care.

Step 1: Measure and Cut

Measure from the edge of the last strip to the corner, again at three points. Add 25mm to 30mm for the wrap around the outside corner. Cut the strip to this width.

Step 2: Apply and Wrap

Hang the strip so it reaches the corner and wraps around onto the adjoining wall. Smooth the wallpaper around the corner carefully, using a soft cloth or brush to press it against the surface. Outside corners tend to be sharper than inside corners, so the paper usually wraps more cleanly.

Step 3: Establish a New Plumb Line

On the adjoining wall, mark a new plumb line as you did for inside corners. The next full strip should overlap the wrapped portion by approximately 10mm.

Step 4: Double-Cut for a Seamless Join (Optional)

For a completely invisible seam, use the double-cut method. Hang the overlapping strip, then use a sharp craft knife and a straight edge to cut through both layers simultaneously, about 5mm from the corner edge. Remove the cut offcuts from both layers, and the two edges will butt together perfectly.

This technique requires a steady hand and a very sharp blade. It works best with thicker wallpapers; delicate papers may tear.

Common Corner Problems and Solutions

Problem	Cause	Solution
Creasing at inside corners	Too much paper wrapped around the corner	Reduce overlap to 15mm; make relief cuts
Pattern mismatch after corner	Corner is not plumb; strip has shifted	Always re-establish a plumb line after each corner
Wallpaper lifting at outside corners	Insufficient adhesive at the edge	Apply extra paste to the corner before smoothing
Air bubbles near corners	Paper not pressed firmly into the corner	Use a seam roller or damp sponge to work out air
Tearing at the corner edge	Blade too blunt during cutting	Use a fresh blade for every cut at a corner

Tips for Singapore Homes

Singapore’s building styles and climate create specific considerations for wallpapering corners.

HDB corners are often not square. Older HDB flats in particular can have corners that deviate significantly from 90 degrees. Always measure at multiple points and never assume a corner is true. The overlap-and-trim method described above accommodates these variations.

Humidity affects adhesion. In Singapore’s humid conditions, wallpaper paste takes longer to set, and edges at corners may lift as the paste dries. Use a high-quality adhesive suited to the wallpaper type and apply extra paste at corners and seams. Consider running a dehumidifier during installation to speed curing.

Air-conditioned rooms help. Installing wallpaper in an air-conditioned room provides a drier, more controlled environment. This results in more consistent adhesion and reduces the risk of bubbling and lifting. Turn on the air-conditioning at least an hour before starting work.

Textured walls add difficulty. Some Singapore condos and landed homes have textured wall finishes. Wallpaper does not adhere well to heavily textured surfaces, especially at corners where the paper must conform to two planes. Skim-coating the walls before wallpapering creates a smooth, even surface for the best results.

Tools You Will Need

• Spirit level or laser level for plumb lines
• Steel tape measure
• Sharp craft knife with spare blades
• Metal straight edge for cutting
• Wallpaper smoothing brush or plastic smoother
• Seam roller
• Pencil for marking
• Clean, damp sponge for wiping excess paste
• Step ladder for reaching the top of the wall

Quality tools make a noticeable difference. A dull blade or an imprecise level will undermine even the most careful technique.

When to Call a Professional

If your room has multiple outside corners, columns, or irregular angles, professional installation is strongly recommended. The cost is justified by the result — a professionally wallpapered room with clean corners elevates the entire interior.

For patterned wallpapers with large repeats, professional installers can minimise waste and ensure pattern continuity around corners. This is especially important with premium wallpapers where material cost makes wastage significant.

Whether you are tackling the project yourself or engaging a professional, always start with a plan. Map out the room, identify every corner and obstacle, and determine your starting point before opening the first roll.

The starting point matters more than many people realise. Begin hanging wallpaper at the most prominent, visible wall and work towards the least conspicuous corner. This ensures that any slight pattern mismatch at the final junction is in the least noticeable position — usually behind a door or in a corner that is not the focal point of the room.

Request free samples from our Singapore showroom to test how different wallpaper weights and textures handle corners in your specific room. Our team can also recommend experienced installers for your project.