There are a few aspects that you must finalize in your mind, before looking at the different online designs. You need to visualize the structure of the house with respect to whether there should be a basement, how many storeys you would like to have, the number of garages that you want, whether you wish to have any outside water pond, the size of the house, the sizes of the different bedrooms, kitchen, living area, etc., and the amenities that you want like bathroom tubs, sinks, and fireplace.
Streets and topography may be the main determinates of a house's orientation, but it's also a good idea to consider sun exposures when possible. A homeowner might reorganize a floor plan to take advantage of morning and afternoon light. Martin says that covered porches that face a southern exposure can help block out heat and sunlight.
Every set of custom house plans includes several items which need to be blown up and detailed for further clarification. If a set of plans does not provide additional close-up drawings (for things such as beam connections, deck railings, stairway construction, etc.), then it is not a complete set. It is very easy to cut corners during the planning process. But the end result will be higher costs for the home owner - and lots of frustration for the building contractor.
The field of drawing custom house plans is a crowded and competitive one. There are many architectural and design firms out there vying for a "piece of the pie." However, if you look closely at examples of their finished product, you will find huge differences among them. The better ones offer quality designs and highly detailed plans.