Custom Home Plans

Welcome to Square One Design, featuring the designs of William Mark Bostic.  Mark has been designing Columbia area homes since 1991, and working with the area's top builders. Custom home building has changed through the years, and Mark has been at the forefront of each new phase of home design from changes in customer preferences, new advances in construction techniques, and changing lifestyle choices.


Over 25 years experience, the best plans start at Square One

Ask about the High Performance Building Program for Super Energy savings and unparalled comfort for your new home!

Square One Design Service

Sometimes the place you live is perfect, except for maybe the house itself.  We've helped to upgrade and remodel countless of Columbia's finest homes, along with the areas finest remodeling craftsmen. From new kitchens, to better bathrooms, and more bedrooms with lots of storage space, call for an onsite visit to discuss the possibilities!

Remodeling plans