Douglas fir, red oak and quality recycled timbers are more expensive that eastern white pine. Complex trusses, such as hammer beams, octagonal frames, hips and valleys will add to the cost of the timber frame. Details such as chamfering, curved knee braces and gun stock posts will all increase costs. The cost of kitchens and baths can greatly affect the completed costs. Within the same space one kitchen can easily be double or triple the cost of another manufacturer's cabinets.
Appliances also vary greatly in cost.
Whirlpool tubs and steam showers add significant costs. Floor finishes can add greatly to the cost when stone, tile and hardwood are used. Heating and cooling systems can increase costs. The type and grade of wood finishes can vary greatly. Stone finishes will add cost over simple wood trim.