I need some good free software to produce a plan for a home extension?

Nothing fancy,just something that will give me scale drawings of walls and Windows etc,I would also be interested in some free estimating software.Any Ideas ?I need some good free software to produce a plan for a home extension?Timing Tasker is a handy software that help you automatically shutdown, power off, reboot, hibernate, suspend or log off computers at schedule time and execute or prohibit some tasks that you specifies. It gives you different ways to schedule the shutdown event for your needs, such as daily, after a process stops and so on.