How to prepare room dimensions for a design project

Define the area you want to change

If the project concerns one room or kitchen, measure that area. The floor area in a property listing may differ from the internal area being designed. Mark uncertain figures as approximate.

Sketch the room from above

Draw a simple plan showing doors, windows, columns, wall recesses, fixed cupboards and the entrance. Label each wall so dimensions and photographs can refer to it. The sketch does not need to be to scale.

Record dimensions in order

1. Measure accessible walls horizontally with a tape or laser measure. Use one unit consistently, such as centimetres.
2. Record door and window widths, their distances from corners and door swing directions.
3. Note floor-to-ceiling heights and low beams only where measurable safely from ground level.
4. Mark visible radiators, sockets and water connections. Do not open walls or ceilings to investigate.
5. Check important dimensions again and flag discrepancies between partial and overall lengths.

Calculate an approximate floor area

For a rectangle, multiply length by width in metres. A 4 m by 3.5 m room is about 14 m². Split an L-shaped room into two non-overlapping rectangles and add their areas.

For an irregular room, dimensions and photographs of corners are more useful than a falsely precise total. Floor area, paintable surface area and material purchase quantities are different measurements.

When measurements are incomplete

Send photographs, any existing plan and the dimensions you know. Mark unknowns rather than guessing. Do not climb furniture or enter unsafe areas to measure. These notes support an initial conversation; professional site measurements must confirm dimensions before fabrication, ordering or construction.