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Deciding whether to buy a prebuilt fireplace kit or build one from scratch comes down to aesthetics, available space, and budget. Many homeowners like the convenience and lower cost of prebuilt options—around $1,500—versus the involved planning and construction of a larger fireplace. Another bonus: you can usually move prebuilt units. Custom projects are more common when homeowners have access to a larger budget and more area in the yard to place the fireplace.

Installing a fireplace insert can get you more heat without replacing the whole fireplace and chimney. Other benefits include their convenience (you can turn them on and off with a simple flip of a switch), safety (most models have built-in sensors that will turn off the fireplace if they detect carbon monoxide), a modern aesthetic, and superior energy efficiency.

The answer can vary widely based on a home's age and design. As with any type of remodeling project, assume that every structure is load-bearing until confirming otherwise with a structural engineer. Almost all modern homes have chimneys that are fully independent from the rest of the home's framing. As a result, they don't bear any load beyond their own weight. However, many historic homes built prior to the 1900s contain load-bearing chimneys that tie into the surrounding roof and floor joists. If possible, use a home's blueprints or look for chimney connections that indicate load-bearing qualities to get your answer.

You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.