For an 1,800-square-foot modular home, it typically costs between $180,000 and $360,000, a relatively stable price range. In contrast, if you choose to build a fully custom home, the cost can be higher, ranging from approximately $350,000 to more than $1 million, and possibly even higher, depending on the type of individual custom details and finishes.

The cost of modular housing is more controllable and stable to a certain extent. This type of home makes costs relatively low and more predictable because of the way it is manufactured and modular assembled. The cost of custom homes is more variable because they require more customization details and special requirements, which can lead to higher labor and material costs.

When considering costs, it is important to note that custom homes may be more valuable and satisfying because of an individual's specific needs. Modular homes, on the other hand, offer a relatively economical and efficient option, especially for buyers who are less demanding about customization.

Overall, whether you choose a modular home or a custom home, you need to make a choice based on your personal budget, preferences and needs. Modular homes may be more stable in terms of cost, while custom homes offer more freedom and opportunities for personalized customization, but also come with higher costs.