Calculating Minimum Room Sizes

Design your room layouts to Calculate the Area for each room

In order to design a house that functions sensibly and has rooms that are appropriate in size, you need to start by estimating the minimum area that you need for each of these rooms.

Using the measurements for the furniture that you think is essential for each room (You should have completed this for homework by now), create ‘birds eye’, top down views of each piece of furniture for each room.

Choose either a 1:25 or 1:50 scale and stick with it. Your final model will be a 1:50 scale but you may find this scale difficult to work with as you complete this activity, especially if you have lots of small furniture items. (See my Whiteboard with information for how to convert your measurements to your chosen scale).

  1. Once you have all of the furniture for each of the rooms drawn and cut out from the grid paper, you need to take a fresh sheet of Grid paper.
  2. Position the ‘furniture’ onto the grid paper into places where you feel would be ideal for that room type.
    1. Make sure to include space for people to walk between furniture and move about the room freely. Comfortable space is usually greater than 1meter between items if you intend for user to walk in this area.
    2. Make sure to leave a 1 meter square space for the door to be able to swing open into the area.
  3. Once all of the furniture and the door space opening is positioned into appropriate places for the room to function appropriately, draw linear lines around the area to define the shape and size of the room.
  4. Once the area is defined, count the number of squares and use the following to calculate the area:
    1. If you are using the 1:25 scale then divide the number of grid paper squares by 16. This number will be the number of Meters square used for that room.
    2. If you are using the 1:50 scale then divide the number of grid paper squares by 4. This number will be the number of Meters square used for that room.
  5. Complete steps 2 to 4 for each of the rooms (Master Bedroom, 2nd Bedroom, Ensuite bathroom, separate guest bathroom/washroom, kitchen, living room, storage area, utility room).
  6. Calculate how much space you have remaining from the 150 meter square that you are allocated for the internal floor space.
  7. Use the remaining space to either increase room sizes OR allocate some of this space for corridors/other rooms

Move on to the next stage where you will develop a range of ideas for a floor plan.