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How to Measure Walls for Wallpaper: The Complete No-Waste Guide
Golden Era Walls · The Journal
Accurate wall measurement is the single most important practical step in a successful wallpaper installation. An incorrectly measured wall means a mural that is too small, too large, or simply wrong for the space. The measurement process takes fifteen minutes if you do it correctly; the consequences of doing it incorrectly can cost significantly more than the mural itself to resolve.
The fundamental measurements for any wallpaper installation are width and height — the full width of the wall from edge to edge, and the height from floor to ceiling. These two measurements determine the total surface area and the dimensions of the mural to order. The complexity comes from the variables that affect those basic measurements: doors, windows, alcoves, chimney breasts, and other architectural features. Understanding how to handle each variable is the key to an accurate measurement.
Key Principles
Measure Width × Height
Measure every wall individually — don't assume they are the same. Take each dimension at two points and use the larger measurement. Add 10% wastage as a baseline before accounting for pattern repeats.
Account for Pattern Repeats
Straight match vs drop match — the pattern repeat type determines how much additional material you need. A straight match wastes nothing; a drop match can require up to 50% more material than the bare wall area suggests.
Doors & Windows
Subtract door and window areas from your total, but leave a 20% buffer — the material savings from subtracting openings are less than most people expect, and rounding up is always cheaper than ordering again.
Order Extra
Always order one additional roll as insurance — dye lots change between print runs, and a shortage discovered after installation is not recoverable without a visible seam difference between the original batch and a reorder.
Pro Tip
"Always order more than you think you need. Dye lots change between print runs, and a half-roll shortage is not recoverable without a visible seam difference."
Design Directions
The Measurement Process
Metal tape measure, pencil, notepad, step ladder. Measure width at two heights, height at two widths. Use the larger of each pair. Record width first, then height, in centimetres for every wall to be wallpapered.
Pattern Repeat Types
Straight match: every drop aligns directly, no waste. Drop match: every other drop is offset — a 64cm repeat requires each drop to be cut from a point 32cm further along, consuming more material per drop.
Room Planning Tips
Sketch the wall before measuring — note all doors, windows, alcoves, and sockets. Decide whether to continue the pattern across interruptions or treat each section independently. Sketch first, measure second, order third.
Ordering Checklist
Width and height for every wall. Pattern repeat type and size. Number of drops required. Total rolls at the roll width. Plus one extra roll. Dye lot noted for any future reorder. All in writing before placing the order.
Frequently Asked Questions
How do I measure a wall for wallpaper?
Measure the full width from corner to corner at two heights (30cm from floor and 30cm from ceiling) and use the larger measurement. Measure the full height from floor to ceiling at two points (left and right sides of the wall) and use the larger. These are your base dimensions. Add 5cm to each for the trim allowance. For rolls of repeating-pattern wallpaper, divide the wall height by the repeat length, round up to the nearest whole number, and multiply by the repeat length to get the cut length per drop. Divide the wall width by the roll width to get the number of drops.
What is pattern repeat and does it affect how much wallpaper I order?
Pattern repeat is the vertical distance between one point in the pattern and the next identical point below it. For a straight match, every drop aligns at the same point — minimal waste. For a drop match, every alternate drop is offset by half the repeat height, which means each drop must be cut from a point further along the roll. A 64cm drop match repeat typically adds 15–20% to the total material needed. Always check the repeat type and size before calculating how many rolls to order.
How much extra wallpaper should I order?
Add 10% to your calculated quantity as a standard wastage allowance, then order one additional roll beyond that total. The 10% covers pattern matching and trim. The extra roll covers installation errors, future repairs, and the dye lot problem — if you need to reorder later, there is no guarantee the new batch will match exactly. Returning an unused roll is nearly always possible; sourcing a matching roll from a different batch is not.
Can I return unused wallpaper rolls?
GEW's return policy covers unused, unopened rolls in original condition — check the current returns page for exact terms and timeframes. The practical recommendation is to keep one roll after installation regardless of return eligibility, as it provides repair material if a section is ever damaged. The cost of holding one extra roll is always less than the cost of a repair section that doesn't match.
What tools do I need to measure walls accurately?
A rigid metal tape measure (not fabric — fabric stretches and gives inaccurate readings), a pencil, a notepad, and a step ladder for ceiling height. A laser measure is ideal if available — it gives more reliable height measurements than a tape on a ladder and can measure across a room to a distant wall without assistance. A spirit level is useful for checking whether the wall is plumb before starting a paste-the-wall installation.
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