Pureflame makes four models of wall-mounted fireplaces, which range in price from US$649 to $879. Freestanding and tabletop models are also available, the cheapest of which can be purchased for $269.

Jeff’s wall was rather plain, featuring just a TV, plant stand and a lifeless plant. But the idea was to enhance it with an electric fireplace, creating a cozy and stylish focal point in their home.

Building a second wall may seem somewhat extreme, but transforming the appearance of an unloved fireplace can pay big dividends. “The fireplace can help tie the whole house together,” Mr ...