There is no one design, style or size that embodies a luxury home

It could be a sprawling 15,000-square-foot French manor set on several rolling acres, or it could be a 4,000-square-foot contemporary home nestled into the side of a mountain. Although it's difficult to quantify exactly what luxury means, most buyers think they know it when they see it.

Across the United States, sales of luxury homes have been hitting records. The number of California homes selling for $2 million or more, for example, reached an all-time high in 2013, as the state rebounded from the foreclosure crisis. The U.S. is not the only place seeing bitg sales of luxury homes. Vancouver, Canada's priciest real estate market, saw a record 36% increase in 2013 over the previous year on sales of homes priced over $2 million.

Prices for luxury real estate have also seen significant increases over the last couple of years. According to Knight Frank's Prime Global Cities Index, which tracks luxury real estate in 30 metropolitan markets around the world, the hottest luxury market now is Jakarta, which saw price increases of nearly 38% at the end of 2013 over the previous year. Knight Frank defines luxury real estate as homes that were sold in the top five percentile in terms of value. Other double-digit price increases in the last quarter of 2013 over the same quarter 2012 include Dublin (17.5%), Beijing (17.1%), Dubai (17%), Los Angeles (14%), Tel Aviv (12.7%), Bangkok (12.3%), San Francisco (10.4%) and New York (10.4%).

Why the Growth?

It may seem incongruous that luxury markets are heating up, given that much of the world is still recovering from the 2008 financial crisis. Like the financial markets, the real estate market operates under the law of supply and demand. And by nature, there are a limited number of luxury homes for sale at any given time in a particular market. That limited inventory alone can help drive up prices as multiple buyers bid on a single luxury property.

International Buyers

In the U.S., international buyers represent a growing percentage of the real estate market, including the luxury market. From April 2012 - March 2013, international transactions were at $68.2 billion, which made up more than 6% of total U.S. existing home sales (in dollars), and more than 4% of transactions, according to the National Association of Realtors (NAR). Florida, California, Texas and Arizona were the leading destinations during that period, with the majority of international buyers coming from Canada, China, India, Mexico and the U.K. These numbers represent a small decrease from 2012's $82.5 billion in sales to international buyers, but NAR believes this is related to the slow growth in some major European economies and that the issue "should dissipate over time."

Buying a Luxury Home

According to the 2013 Profile of Home Buyers and Sellers published by the National Association of Realtors, nine out of 10 buyers used the Internet at some point when looking for a home, and 43% of recent buyers first found the home they purchased online.

Find a Qualified Real Estate Agent

If you are in the market for a luxury home, a qualified real estate agent who knows the luxury market may be your best bet for finding properties that are for sale but that are not necessarily easy to find because of privacy concerns. An agent familiar with the luxury market may have inside information about listings before they hit the open market. And, an experienced agent will be able to help you determine the market value of a luxury property. Most residential real estate is valued using comparables - similar properties in the area that have recently sold. Valuing luxury properties can be a challenge since often there are no similar properties in the area.