You want something that is comfortable for working in, without being distracting, and you want something that is well organized to be functional and intuitive. There is no point in using a lot of complex organization if you wont be able to remember where everything is or are not comfortable using it.
One of the first steps in putting together the perfect office is choosing the right furnishings. You will want a solid desk, a sturdy chair and adequate shelving or cabinets. Depending on what sort of work you will use it for, you may need a full filing cabinet as well as additional storage space, beyond your desk. If you will entertain others, sometimes a minibar and additional chairs may be in order.
Your budgeting and plans for how to use the office will determine the amount of furnishings, but at minimal, a good desk set is required for an office. If you are strapped for space, using multi-purpose furnishing or designs that incorporate storage will help a lot. If you are renovating or planning from scratch, you can take real advantage of in the wall storage and hidden compartments behind panels to maximize floor space.
The décor of your office space can say a lot about how you are in regards to business dealings and your personality. If you are uncertain how to decorate the walls and floor to best convey the message you desire to send, you can either look on-line for style guides or consult an interior decorator. It is actually not as an expensive endeavour as you may think to work with one. If nothing else, a general consultation with one can give you ideas of what direction to work towards.
A lot of times people may make the mistake of letting someone else choose the décor entirely. Even if that other person is an interior designer it can be a big mistake. One of the most important elements to the perfect office is being perfectly comfortable inside it. If the colours happen to be your least favourite in the world then it benefits you nothing to be distracted by them. The same goes for the furnishing, if your set-up is trendy and clean but uncomfortable you will find yourself being distracted from work.
No one wants to work in a dark space with no natural light. If you are converting a small interior space that does not have close access to a window it might be an idea to:
Fit a Sun Lite Light Tube System. These not only save energy, Light tubes transforms dark or windowless rooms. Ideal for a new home office. Click here for instructions for fitting. (as a video for DIYers.)
Fit roof lights. The price of roof lights has been falling in recent years and they can now be bought online cheaply. Simply measure the opening you want and then choose the right size to fit. Roof lights come in round or square shapes and can make a real difference in general ambiance.
Enlarge current windows (if budget allows). Just be aware that adding bay windows and sometimes changing window sizes can be subject to planning permissions. See the Guardian for help and advice with local planning.
Design tips & tricks to brighten a dark room. Install mirrors or choose lighter wall coverings or paints. See examples.