The term "bespoke" is commonly used throughout the United Kingdom to denote an item that has been custom or handmade. Choosing a bespoke bookcase, therefore, starts with determining what your needs and desires are for the final design. You will need to research different furniture makers or carpenters in your area to find one that you will be satisfied working with; be sure to look at that furniture maker's other work, whether the piece is a bespoke bookcase or a custom dresser, and so on, to ensure that carpenter is capable of building the unit you want and need.
Once you have found a furniture maker, begin to think about what type of wood or other materials you want for your bespoke bookcase. The choice of materials will have a significant impact both on the overall price of the bespoke bookcase and on the appearance and durability. Hardwoods will be more resistant to damage, while softwoods tend to be less expensive; metals can be used as well, though some furniture makers will not be able to work with metals when building the unit. Be sure to communicate your desires to the furniture maker to ensure he or she is capable of working with the materials you want.
Before the construction of the bespoke bookcase begins, you will need to consider where in your home or office the unit is going to be placed. Take accurate measurements of the space and be sure to give those measurements to the furniture maker. This will ensure you get a finished product that is an appropriate size and shape for the space. Think, too, about what will be stored on the bespoke bookcase once it is finished; try to get an idea of how many books will be on the shelves, as well as what other items will be placed on the shelves, so the builder can make shelving and other features appropriate for your needs.
In some cases, it may be appropriate to hire a carpenter who can come to your home and build permanent bookcases integrated into walls, alcoves, or other features. This option is likely to cost more, but you will end up with an attractive and functional bespoke bookcase to suit your needs. If you choose this option, be sure to find a builder who will be willing to take on the job for a reasonable price; don't be afraid to get more than one price quote from various builders.