How to Hang Wallpaper: Preparation, Paste, Pattern Matching and Finishing

Summary

Wallpapering is one of those trades where technique separates a craftsman's result from a DIY attempt, and the difference shows most clearly at the pattern match and at seams. A decorator who hangs paper plumb, butts seams cleanly, matches patterns within 2 mm, and trims neatly at coving and architraves will have work that lasts 10 years and looks impeccable throughout. Sloppy preparation — walls not properly sealed, paste too thin, paper stretched — results in lifting seams within months.

The majority of wallpapering callbacks relate to three root causes: inadequate preparation (unsized walls soaking paste from the paper too quickly); incorrect paste consistency (too thin means the paper slips; too thick makes it hard to slide and correct); and starting against a wall or corner instead of a true plumb vertical. This article covers the process systematically and addresses the common failure points.

For homeowners reading this: labour for decorators to hang wallpaper is typically £80–£160 per day, with an average room taking 1–2 days depending on wallpaper type, pattern repeat, and ceiling height.

Key Facts

• Sizing — applying dilute paste (10:1 water to paste) or dilute PVA (5:1) to the wall before papering; prevents the wall from absorbing paste from the back of the paper too quickly; essential on new plaster or bare plasterboard
• Plumb line — always establish a true vertical reference line before the first drop; walls are never perfectly square; use a spirit level or plumb bob
• First drop position — typically 600 mm from a corner or centred on the main feature wall to balance any cutting at each side
• Pattern repeat — the vertical distance between identical pattern elements; straight match (patterns align horizontally across seams); drop match (alternate drops offset by half a repeat)
• Waste allowance for pattern repeat — add one full pattern repeat per drop to allow pattern matching; for a 900 mm ceiling repeat on a 2.4 m room height, each drop costs approximately 3.3 m of wallpaper
• Paste board — a clean, flat surface for pasting; standard size 1800 × 560 mm; paper overhangs the edge, paste applied with a wide brush from centre outward
• Booking — folding the pasted paper on itself (paste to paste) while it soaks; allows time for the paper to relax and become pliable; soaking time varies by paper type (standard 5–10 min, heavy embossed 10–15 min, some paste-the-wall papers 0 min)
• Paste-the-wall papers — some modern wallpapers (non-woven / fibre-backed) are designed for adhesive application to the wall, not the paper; eliminates pasting table mess; paper can be hung dry and positioned on a wet wall
• Seam types — butt seam (edges meet neatly without overlap); overlap seam (one edge overlaps 10–20 mm, then a double cut removes both layers for a perfect butt); overlap only for vinyl-on-vinyl (requires overlap adhesive)
• Trimming at ceiling/coving — use a broad knife (papering knife) as a guide, crease paper into the junction, pull back slightly, trim with sharp scissors or snap-off blade, then brush back into position
• Soaking time variation — always check the manufacturer's instructions; over-soaking causes the paper to become difficult to handle and can cause stretch marks

Quick Reference Table

Detailed Guidance

Preparation: The Part That Determines Everything

Surface preparation: Walls must be clean, dust-free, and in good repair. Fill all holes and cracks with ready-mixed filler, sand flush when dry. Remove any flaking paint; sand any glossy areas to provide a mechanical key. Wipe down with a damp cloth.

Stripping old wallpaper: All old wallpaper must be completely removed. Steamer hire makes this faster on multi-layered walls; score the existing paper with a scoring tool before steaming to aid penetration. Leave walls to dry completely after stripping (minimum 48 hours) before applying size or hanging new paper.

Sizing: Apply dilute size (wallpaper paste diluted 10:1) or dilute PVA (5:1) to the entire wall area with a brush or roller. Allow to dry. This creates an even absorbency across the wall surface and prevents the paste being pulled out of the paper too quickly when hung. On new plaster, sizing is mandatory — new plaster is extremely absorbent and will dry the paste before the paper is positioned, causing it to peel.

Lining: For high-quality wallpapered finishes, cross-lining (hanging lining paper horizontally at 90° to the finished wallpaper) provides a flat, even surface that eliminates any surface texture showing through and strengthens seams. Cross-lining is standard practice for silk or metallic papers and on walls with minor imperfections. Use a butt seam on lining paper and let it dry thoroughly (minimum 24 hours) before wallpapering.

Setting Out

Never start at a corner — corners are never perfectly plumb, and starting there means the first drop is immediately out of vertical. The correct approach:

1. Identify the most prominent feature in the room (chimney breast, main wall facing the door, or window wall on a feature wall).
2. If centring the pattern on the feature wall, measure the wall width, find the centre, and mark it. Measure half a wallpaper width to one side — this is where the first drop edge sits.
3. Use a spirit level or plumb bob to draw a perfectly vertical line at this position.
4. For a room-perimeter application (all four walls), start 600 mm from a corner on the main wall, mark a plumb line, and work around the room returning to the corner last.

Pattern centring on chimney breasts: A chimney breast looks best with a full pattern centred on it. Measure the breast width, find the centre, and align the pattern centre on the first drop. Cut the drops for each side symmetrically — the same amount of pattern should appear at each side of the breast.

Pasting and Hanging

Paste consistency: Mix paste per manufacturer instructions. Standard overlap paste should coat the brush with a smooth, even layer and not run off the paper edge like water. Too thin means the paper won't stick long enough to be positioned; too thick means it's hard to smooth.

Pasting technique: Lay the paper on the table. Brush paste from the centre of the paper to the near edge, then from the centre to the far edge. Work down the length. Fold the pasted section back on itself (booking) before drawing the paper down the table and pasting the second half.

Hanging the first drop:

1. Carry the booked paper to the wall
2. Unfold the top fold and position the paper against the plumb line, leaving approximately 50 mm overlap at the ceiling for trimming
3. Smooth from the centre outward with a paperhanger's brush or seam roller
4. Unfold the lower fold and smooth into position
5. Run a paperhanger's brush down the seam edge firmly to ensure adhesion

Pattern matching subsequent drops: Lay the second drop of paper alongside the first (off the wall) and align the pattern before cutting to length. Most paper is forgiving of 1–2 mm pattern misalignment; perfectionist hanging on a large repeat will consume more paper.

Seams and Finishing

Seam technique: Butt seams on most papers. Position the second drop so the edge meets the previous drop cleanly without gap or overlap. Slide the paper horizontally before smoothing it down to achieve the precise alignment. Once positioned, run a seam roller firmly down the join.

Concave (inside) corners: At an inside corner, measure from the last hung edge to the corner at top, middle, and bottom. Add 10–15 mm wrap. Cut the paper to this width, hang it, wrapping 10–15 mm around the corner. Mark a new plumb line on the adjacent wall 10–15 mm from the corner and start the next drop on this line — this compensates for any out-of-plumb at the corner.

Convex (outside) corners: Cut the paper to overlap the corner by 20 mm. Wrap this edge around the corner. Draw a new plumb line 5 mm from the corner on the adjacent face and continue.

Above doors and windows: Fill above doors and windows with short drops, matching the pattern to the hanging side. These short drops use much less paper per drop but still require accurate pattern alignment.

Frequently Asked Questions

My client wants to wallpaper over existing wallpaper to save time — is that acceptable?

It is tempting, but rarely advisable. The weight of new paper plus paste can cause old paper to lift, pulling both layers off. The joins in old paper show through new paper (double seam ridges). If the existing paper has any bubbles or loose sections, they will telegraph through. Standard practice is to strip all old paper. The only exception is lining paper in perfect condition: it can sometimes be left if fully sound, but hanging over it creates a risk of failure.

How much wallpaper do I need to order?

Calculate room height, add one full pattern repeat per drop (for matching). Divide the wall perimeter by the wallpaper width to get the number of drops. Multiply drops by the adjusted drop length to get total linear metres. Divide by the roll length. Add 10–15% for waste on patterns under 500 mm repeat; 20–25% for large repeats (over 500 mm). Always order from the same batch — different batches often have slight colour variations even in identical colourways.

When should I use paste-the-wall wallpaper?

Paste-the-wall non-woven papers are excellent for feature wall applications, ceilings, and situations where space is limited and a paste table is awkward. The paper can be trimmed and corrected easily while on the wet wall. They are less forgiving of very humid conditions (paste dries faster in warm rooms). For whole-room conventional papering with a paste table and help available, traditional paste-the-paper method remains standard.

Regulations & Standards

• No specific British Standard for residential wallpaper hanging; professional practice follows CSCS-endorsed decorator training standards and manufacturer installation requirements

• BS EN 233:1999 — wallcoverings: specification for finished decorative wallcoverings; applies to wallpaper products

• Building Regulations Part C — moisture resistance requirements; relevant where wallpapering in bathrooms (use moisture-resistant wallpaper and adhesive)

• Painter and Decorator Association (PDA) — Technical Guidance — professional guidance on wallpaper specification and installation

• Dulux Academy — Wallpaper Hanging Guide — practical illustrated guides from major UK paint brand

• Cole & Son Technical Advice — Hanging Instructions — premium wallpaper manufacturer installation guidance

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