Contractors

How to Estimate Wallpaper for a Job: A Contractor's Guide

Estimating wallpaper for a job follows a repeatable method. The inputs are the room dimensions, the roll spec, and the pattern repeat. The output is a roll count per room. The errors come from skipping steps — usually using an assumed roll size rather than the actual one, or forgetting to add the repeat to each strip length. This guide walks through the full method, from measuring the room to placing the order, with the specific details that matter on a trade job.

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Step 1: Measure each wall separately

Measure every wall that will be wallpapered — width and height. Measure separately even if two walls look the same length; in older properties they rarely are. Record the height at the tallest point of each wall; account for sloped sections separately. Subtract door and window widths from the relevant wall measurements, but be conservative: a strip that runs alongside a window is usually only partly usable, so a 30–40% deduction per window is more realistic than the full window width.

Step 2: Get the roll spec from the batch label

The roll width and length determine how many strips you get per roll. Standard UK/EU rolls are 52–53 cm wide and 10 m long, but premium papers, wide-format rolls, and US imports differ significantly. A 90 cm wide roll gives nearly twice the strip coverage per length. An 8.5 m roll gives one fewer strip than a 10 m roll at the same ceiling height. Always check the label — quoting from an assumed spec rather than the actual one is the most common cause of material shortfalls.

Step 3: Add the pattern repeat to each strip

The pattern repeat is printed on the roll label (look for a symbol showing two overlapping rectangles, or the text 'rapport'). Add the full repeat distance to the ceiling height to get the cut length per strip. If the ceiling is 2.6 m and the repeat is 72 cm, each strip needs 3.32 m. A 10 m roll yields three strips (3 × 3.32 = 9.96 m). A plain paper yields four strips per 10 m roll at the same height. The repeat can increase the roll count by 25–50% depending on ceiling height.

Step 4: Calculate strips per room and divide by roll yield

Divide each wall's width by the roll width (subtract 1–2 cm for overlap on joins) to get the strip count for that wall. Sum strips across all walls in the room. Divide total strips by strips per roll. Round up to the nearest whole roll. Add one buffer roll for plain or small-repeat jobs; add two for repeats above 60 cm or for designer papers with limited batch availability.

Step 5: Use a professional calculator to check your working

Running the method manually is reliable for a single rectangular room. For multi-room jobs, rooms with chimney breasts or alcoves, or when you are quoting on a tight margin, use a professional wallpaper calculator to check the figure. The Wallpaper Planner lets you enter wall dimensions, exact roll sizes, and pattern repeat room by room and produces a cutting plan you can share with the client. The paid plan adds strip-by-strip details and a printable order list.

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Common questions

How do I estimate how many rolls of wallpaper I need for a job?

Measure each wall (width and height), get the roll spec from the batch label, add the pattern repeat to your strip cut length, then divide total strips needed by strips per roll. Round up and add one buffer roll. Use a professional wallpaper calculator for multi-room or complex jobs.

Should I deduct doors and windows from my wallpaper estimate?

Yes, but conservatively. Deduct the full door area. For windows, deduct 30–40% of the window area — strips running alongside or above windows are often only partly usable. On most rooms, this saves 1–2 rolls.

How much should I add as a buffer when estimating for a trade job?

Add one roll per room for plain or small-repeat papers. Add two rolls per room if the repeat is above 60 cm, if the paper is a designer or limited print run, or if the room has unusual features such as a chimney breast or bay window.

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