Keep doors, primer and wallpaper out of the wall-paint total

Room paint is a useful starting estimate, but doors, preparation coats and wallpaper do not belong in one undifferentiated total. Each has a different scope or purchasing constraint that needs to remain visible.

Measure door faces explicitly

One illustrative 2.4 × 0.82 m door has 1.968 m² per flat face, or 3.936 m² for two faces. Two finish coats at an example 10 m²/L require 0.7872 L before allowance. This excludes edges, mouldings and frames. A profiled door can need a more detailed surface estimate.

Give primer its own rate

Do not assume primer uses the finish-paint rate or the same coat count. Some surfaces need a different preparation system, while others need only local treatment. Record the selected product, coverage and measured primed area; if they are unresolved, leave the primer quantity pending.

Check wallpaper by strips and pattern

An illustrative 10 m roll cut into 2.6 m drops yields three full drops before any pattern matching, trimming or defects. At 0.53 m width, three drops span 1.59 m of wall. A simple area ratio can miss this length constraint, and a pattern repeat can reduce the usable drop count further.

Use the project evidence appropriately

The Trevanion worksheet calculates scheduled door-face area and keeps unresolved coating items separate. Its dimensions are a traceable project example, not a default for other doors. Use your actual schedule, product data and cutting layout to complete the order.

Found a measurement or calculation issue? Send the example and your correction.