Nothing transforms a room faster than a new floor but before you decide what material or pattern you want, consider how you're going to join the new floor to the existing ones in the house. If you're dealing with a new home and a smooth subfloor or same surfaces you can use a standard T-molding threshold. But the situation requires more thought when you have uneven floor surfaces due to previous remodeling.
A multi-floor transition threshold will bridge two different level floors because it's designed around hidden fasteners or plugs created to flex and accommodate different levels. You tap the threshold into holes drilled into the floor until it is level and bridges the two surfaces. There's also hardwood transition thresholds specifically designed to bridge a gap between a hardwood floor and other surfaces. You'll find them sold at lumberyards, flooring centers and online.
A carpenter will charge about $70 to install a multi-floor transition threshold, you can buy the threshold for $12 and do it yourself and save 82 percent. Most likely you'll have to custom cut the threshold to size and do some finagling to get it to fit. Before installing the threshold thoroughly clean the area with a crevice tool from a shop vac or vacuum to remove any dirt or dust in the crevices of the floor joints.
That sums it up. Knowing the average cost to install a transitional threshold lets you compare doing it yourself with what you can expect to pay a contractor. To customize the cost to where you live add your ZIP Code in the cost box.