Most people who brew their own beer do so in small quantities. Whilst there is nothing wrong with this to start with, once you hit upon a magical recipe you will obviously want to brew it on a larger scale so as to share your success with as many people as possible.
Making a large home brew is ideal if you are planning to have a big party or if you have lots of storage space which would be otherwise wasted. If either of these apply to you then you have no excuse for not making a large batch of your favorite home brew beer! Should these circumstances not apply to you then you are probably better off sticking with smaller, more frequent, brews as you may end up with an unacceptable amount of wastage.
As with most other things in life, the bigger you want something to be, the more time and effort it takes. The same principle applies to home brewing. Therefore, make sure that you have the basic processed down to an art before making a large brew to avoid wasting your time and efforts.
Another thing that you are going to want to think about before making a large home brew is the fact of whether you have the space to do it. As with a small home brew, a large home brew can be made in a standard sized kitchen. The difference with a making a large home brew is that you may have to temporarily clear out of the way any none essential items.
Assess the amount of space that you have available on the countertops, in the sink and in the fridge. Spend a few minutes maximizing the space available for your large home brew as moving things out of the way whilst you are in the process of brewing could cause you to lose your concentration and make a mistake.
If you do not have sufficient space in your kitchen, then there are basically two options that you have; either you make a series of smaller brews one after the other, or you give a fellow beer lover a percentage of the finished product in return for them giving you the use of their kitchen.
In terms of the actual brewing process, it is exactly the same to make a large brew as it is to make a small one. Just make sure that you increase the quantities of the ingredients in equal measures.