Adding Wallpaper to Existing Walls: What You Need to Know

What wallpaper additions mean and when to use them

Wallpaper additions are decorative elements—borders, panels, murals, or accent strips—applied over existing wallpaper or painted walls to refresh a room without removing what's already there. Unlike full wallpapering, which covers an entire wall or room, additions let you add visual interest to specific areas: a border along the top of a wall, a mural behind furniture, a patterned panel flanking a doorway, or a contrasting strip down a corner.

This approach works best when your existing wall covering is in good condition—clean, smooth, and firmly adhered. If your current wallpaper is peeling, bubbling, or loose, those problems will worsen once you layer something new on top. Additions also work well on painted walls as long as the paint is not glossy; a matte or eggshell finish gives the new wallpaper something to grip.

Homeowners choose additions for several reasons: they cost less than full wallpapering, they take less time to install, and they let you experiment with bold patterns or colors in a smaller commitment. A border can define a room's proportions, a mural can become a focal point, and accent panels can break up large blank walls without overwhelming the space.

Key Takeaways

• Wallpaper additions work best over clean, smooth, firmly adhered existing walls—either painted or already wallpapered.
• Borders, murals, and accent panels each require different measuring and installation techniques, so plan your design before you buy materials.
• Prep work—cleaning, smoothing, and sometimes priming—takes as long as installation and determines whether the addition stays put.
• Removal of additions is usually easier than removing full wallpaper, but adhesive residue can damage paint if not handled carefully.

Types of wallpaper additions and where to place them

Borders are the most common addition. They run horizontally along the top of a wall, around a doorway, or at chair-rail height (roughly 36 inches from the floor). A border can frame a room, separate two paint colors, or add a decorative line without committing to pattern everywhere. Borders come pre-pasted or unpasted, in widths from 2 to 12 inches, and in thousands of patterns.

Murals and large-scale panels cover a defined section of wall—often behind a bed, sofa, or dining table—and serve as a room's visual anchor. These are typically sold as a set of strips that fit together like a puzzle. A mural might be 4 feet wide and 6 feet tall, or larger. They work well in bedrooms, dining rooms, and living rooms where you want a statement without covering all four walls.

Accent panels are smaller, framed sections of wallpaper applied to a single wall. You might install a 3-foot-wide panel of pattern flanking a window, or a vertical strip down the center of a wall between two doors. Panels let you combine wallpaper with paint—for example, a solid paint color with a patterned panel as contrast.

Corner strips and wainscoting-style applications run vertically down corners or horizontally across the lower third of a wall, mimicking the look of traditional wainscoting without the carpentry. These work in hallways, bathrooms, and bedrooms to add texture and visual weight to the lower half of the room.

Measuring and planning your addition

Accurate measurement is the first step. For a border, measure the perimeter of the wall or the specific section where the border will go. If you are running a border around the top of a room, measure each wall's length and add them together. For a mural or panel, measure the width and height of the space where it will hang, then check the product's dimensions to see how many strips you need and whether they will fit.

Write down your measurements in inches and take a photo of the wall. Note any obstacles—outlets, light switches, windows, or architectural details—that the addition will need to fit around. Bring these measurements to the store or use them to order online, because wallpaper is often sold in specific roll sizes and you need to know how many rolls to buy.

Plan the placement on paper before you start. Sketch your wall to scale, mark where the addition will go, and note how it relates to furniture, windows, and other features. For a border, decide whether it will run at the ceiling, at chair-rail height, or at a custom height. For a mural, decide whether it will be centered on the wall or positioned to one side. This planning step prevents mistakes that are hard to fix once wallpaper is on the wall.

Preparing the wall for installation

Clean the wall thoroughly with a damp cloth or sponge and mild soap. Remove dust, cobwebs, and any sticky residue. If the wall is painted, lightly sand any glossy areas with fine-grit sandpaper (220-grit or higher) so the wallpaper adhesive can grip the surface. If the wall is already wallpapered, make sure all edges are firmly adhered; if you find loose spots, seal them down with wallpaper paste before adding the new layer.

Fill any holes, dents, or gouges with spackling compound, let it dry, and sand it smooth. If the wall is uneven or has visible imperfections, consider applying a primer or sizing solution designed for wallpaper. Sizing creates a uniform surface that helps adhesive stick evenly and makes removal easier later. Many wallpaper installers apply sizing even to painted walls before adding borders or panels.

Let the wall dry completely before you begin. If you have just cleaned it, wait at least a few hours. If you have applied sizing or primer, follow the product's drying time—usually 2 to 4 hours, but check the label. A damp wall will cause wallpaper to bubble, wrinkle, or fail to stick.

Installing borders, murals, and panels

For a border, start by marking a light pencil line where the border will run. Use a level to make sure the line is straight, especially if the ceiling or chair rail is not perfectly level. If the border is pre-pasted, soak it in lukewarm water according to the package instructions—usually 15 to 30 seconds per strip. If it is unpasted, apply adhesive to the back using a paste brush or roller.

Position the first strip at a corner or the most visible starting point, align it with your pencil line, and smooth it onto the wall with a plastic smoother or soft cloth, working from the center outward to push out air bubbles. Overlap the next strip slightly, match the pattern, and smooth it down. Continue around the room, cutting the final strip to fit if needed. Wipe away excess paste with a damp cloth before it dries.

For a mural or large panel, start by finding the center of the wall and mark a vertical line with a level. Murals are usually designed to be centered, so this line helps you position the first strip correctly. Soak or paste the first strip, align it with your center line, and smooth it down. Apply the next strip directly beside it, matching the pattern exactly at the seam. Continue until all strips are in place. Large murals take longer because you have more seams to match and more area to smooth.

For an accent panel, measure and mark the panel's boundaries with a light pencil line. If the panel has a frame or border, you might apply that first, then fill in the center. Apply paste or soak the strips, position them within your marked area, and smooth them down. Trim any excess at the edges with a sharp utility knife.

Dealing with obstacles and seams

Outlets, light switches, and other fixtures require careful cutting. Before you apply wallpaper over an outlet, turn off the power at the breaker. Apply the wallpaper over the outlet, then use a utility knife to cut an X from corner to corner of the outlet opening. Fold the flaps back, trim them close to the outlet box, and smooth the wallpaper down. Reinstall the outlet cover plate, which will overlap the wallpaper edges and hold them in place.

Seams—the edges where two strips meet—are the most visible part of any wallpaper addition. Match the pattern carefully before you paste, and use a seam roller (a small handheld tool with a rounded wheel) to press the seam flat once both strips are in place. Roll gently; too much pressure can squeeze out adhesive and create a gap. Wipe away any paste that oozes from the seam with a damp cloth.

If a seam is stubborn or the pattern does not match perfectly, you can overlap the strips slightly and cut through both layers with a sharp utility knife, then remove the waste and re-smooth. This technique, called a double-cut seam, creates an invisible join but requires a steady hand and a very sharp blade.

Finishing and protecting your addition

Once all strips are in place and smoothed, let the adhesive dry completely. This usually takes 24 hours, though some products dry faster. Do not wash the walls or expose the wallpaper to moisture during this time. Keep the room at a normal temperature and humidity; extreme heat or cold can cause the wallpaper to shrink or expand unevenly.

After the adhesive has dried, inspect the addition for bubbles, wrinkles, or loose edges. Small bubbles can sometimes be smoothed out by gently pressing with your hand. Larger bubbles may need to be slit with a utility knife and re-pasted. Loose edges can be re-glued with a small amount of wallpaper paste applied under the edge with a thin brush.

In high-moisture areas like bathrooms or kitchens, consider applying a clear protective coating over the wallpaper addition. These coatings protect against moisture and make the wallpaper easier to clean. Follow the product instructions for application and drying time.

Removing wallpaper additions later

One advantage of additions over full wallpapering is that they are usually easier to remove. To remove a border or panel, gently lift a corner or edge with a plastic scraper or old credit card. If it comes up easily, peel it slowly and steadily. If it resists, spray the edge with a mixture of equal parts white vinegar and warm water, wait a few minutes, and try again.

Once the wallpaper is off, you may have adhesive residue on the wall. Spray the residue with vinegar solution or use a commercial wallpaper remover, wait, and gently rub it away with a soft cloth. Do not scrub hard, especially on painted walls, as you can damage the paint. If the paint is damaged, you may need to touch it up or repaint the area.

If the wallpaper addition was applied over existing wallpaper, removal is usually cleaner because the adhesive bonds to the wallpaper rather than the paint underneath. If it was applied directly to paint, take extra care during removal to avoid peeling the paint.

Frequently Asked Questions

Can I put wallpaper additions over textured or popcorn walls?

Textured walls are challenging because wallpaper adhesive does not grip the uneven surface evenly. You can try applying a primer or sizing solution first to create a smoother base, but results are unpredictable. Popcorn ceilings are not recommended for wallpaper because the texture is too loose and can shed. Smooth or lightly textured drywall works best.

What if my existing wallpaper has a seam where I want to place a border?

Position the border so it does not run directly over the seam if possible. If you cannot avoid it, make sure the existing seam is firmly glued down before you apply the border on top. The border's adhesive may re-activate the old seam, so press it down extra firmly and check it after 24 hours.

How much does wallpaper addition material cost?

Borders typically cost between $5 and $20 per roll, depending on the pattern and brand. Murals and large panels cost more—usually $30 to $100 or higher for a complete set. Pricing varies widely, so check with local home improvement stores or online retailers for current prices on the specific products you want.

Do I need to hire a professional to install wallpaper additions?

Borders and small panels are straightforward enough for a confident DIYer, especially if you take time with measuring and prep work. Large murals with many seams are more forgiving of mistakes than full-room wallpaper, but they still require patience and attention to pattern matching. If you are unsure, a professional installer can complete the job quickly and may provide the result.

Can I apply wallpaper additions over glossy or semi-gloss paint?

Glossy paint is slippery and does not hold wallpaper adhesive well. Sand the area lightly with fine-grit sandpaper to dull the finish, or apply a primer designed for glossy surfaces. This extra step ensures the wallpaper will stick and stay put.