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You can build a fireplace on an existing house, but it’s much easier to construct a masonry fireplace when building a new house. To add to an existing house, you’ll need to build a chimney and ensure the foundation can support a true masonry fireplace. Alternatively, you can purchase a gas or electric fireplace insert, which isn’t as complicated to add to an existing structure.

A well-constructed and regularly maintained brick chimney can last 50 to 100 years, potentially spanning multiple generations of homeowners. The exact lifespan depends on the quality of construction, materials, local environment, and maintenance. In contrast, a metal chimney typically lasts 15 to 20 years. While the main structure is durable, individual components have shorter lifespans and require more frequent replacement. For example, mortar may need repointing every 20 to 30 years, chimney crowns last 50 to 75 years, and liners can last anywhere from 15 to 50 years depending on the material (e.g., stainless steel vs. cast-in-place).

The lifespan of a chimney damper depends on several factors, including its material, how often the fireplace is used, and the amount of debris that enters the chimney. With proper maintenance, an average damper can last about 20 years. To ensure it is functioning correctly, it is best to have it professionally inspected. Some experts recommend an annual inspection, while others suggest having a chimney sweep inspect and clean it every two years. A professional can assess the damper's condition and determine if a replacement is necessary.

Running a gas fireplace is potentially cheaper than using central heating if you are heating a single room and don’t need to heat the entire house. That's because gas fireplaces are a better source of direct heat, making them more efficient for warming small spaces. Central heating, while more efficient for whole-home warmth, uses more energy overall. Strategically using a gas fireplace, therefore, can help lower heating bills.