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Carefully measure the size and shape of the bathroom
Use a tape measure to make detailed measurements of your bathroom. Try to be as accurate as you can because even a small error can make all the difference especially when remodeling small bathrooms. Start by measuring the length, width and height of the room then fill in any details such as windows and pipe work etc. When measuring the bathroom always take measurements at both ends because it's surprising how often rooms aren't exactly 'square'. When you have measured the room itself you should also measure the size and shape of the existing equipment. Write down all the measurements ready to draw out the plan.
Draw a plan of the room when it is empty
The first drawing you will need is one of the room bare of all fixtures. This should be quite easy unless the room is an odd shape. Using your measurements for the room carefully draw the outline on square graph paper. Make full use of the squares on the paper to help you draw a true scale drawing that uses as much of the paper as possible. For instance, if your room is 7 foot 6 inches by 12 foot 6 inches and you have some graph paper with 18 squares by 26 squares then a suitable scale might be 2 squares to the foot. This will fit on your paper using a rectangle of 15 squares by 25 squares.
You might want to make several copies of the bare bathroom plan to use later. You can either photocopy one that you have drawn or simply draw out several copies.
Draw a plan of the existing bathroom
Use your measurements to draw a plan of the existing bathroom and it's fixtures. This is where one of your bare room plans will come in handy. You will find that this is good practice for when it comes to drawing out your new design and it will give you something to show contractors when you are explaining how you want the bathroom to be redesigned. It will be clear from this diagram where all the main services are located. Don't forget to mark the position of faucets on the bath so that it's clear where the existing pipe work is situated. It's worth taking your time with this diagram because it might be the last chance you get.