Modular Home Cost Calculator

In 2026, a modular (prefab) home typically costs $100 to $250 per square foot all-in (turnkey), so a 1,800-square-foot modular home commonly runs roughly $180,000 to $450,000 including the home, delivery, set, foundation, and finishing — though the base modules alone (before site work and foundation) can be considerably less. The cost depends on the home's size, the module class (single-section is cheapest, multi-section is standard, custom modular is premium), the finish level, the site conditions, and the substantial 'site costs' beyond the factory price: the foundation, utility connections (water, sewer, electric), transport and crane set, design and permits, and any garage or porch/deck. It's important to understand that the manufacturer's base price for the modules is just part of the total — the land, foundation, utilities, delivery/set, and finishing add significantly to reach the turnkey cost. Modular homes are often comparable to or somewhat less expensive than equivalent stick-built homes, with savings from efficient, weather-protected factory construction and faster build times, but they're not always dramatically cheaper once all site costs are included. This calculator estimates the modular home cost including site work; it lets you adjust the size, class, finish, and conditions, with major site costs as add-ons to build a more complete budget.

These are different home construction methods that are often confused. A stick-built (site-built) home is constructed entirely on-site, piece by piece, by a crew — the traditional method. A modular home is built in sections ('modules') in a factory, then transported to the site and assembled/joined on a permanent foundation; crucially, modular homes are built to the same state/local building codes as site-built homes (the same codes that apply to stick-built), so once installed on a foundation they're essentially indistinguishable from and treated like site-built homes for financing, appraisal, and resale, and they're considered real property. A manufactured home (formerly 'mobile home') is also factory-built but is constructed to the federal HUD code (a different, national standard) rather than local building codes, is built on a permanent steel chassis/frame, and is often placed on a non-permanent foundation — it's a distinct category with different financing and is sometimes considered personal property. The key distinctions: modular = factory-built to local building codes, set on a permanent foundation, treated like a regular house; manufactured = factory-built to HUD code on a chassis, a different category; stick-built = built on-site to local codes. Modular homes bridge the gap — the factory efficiency of prefab with the code compliance and permanence of site-built. This calculator focuses on modular/prefab homes (including single and multi-section). Understanding which type you're considering matters for cost, financing, and value.

Modular homes are often somewhat cheaper than equivalent stick-built homes, but not always dramatically so, and the savings depend on the project. Where modular saves money: the factory construction is efficient — building indoors in a controlled environment avoids weather delays, allows bulk material purchasing and assembly-line efficiency, reduces material waste, and uses streamlined labor, which can lower the construction cost of the home structure itself; and the much faster build time (modules are built in the factory while site work happens in parallel, and the home is assembled quickly on site) saves on financing/interest carrying costs and gets you in sooner. Where the savings shrink: the 'site costs' — land, foundation, utility connections, delivery and crane set, permits, and finishing — are largely the same as for a stick-built home and don't benefit from the factory efficiency, so once these are added, the total turnkey cost gap narrows; transportation and crane costs are an added expense unique to modular; and high-end custom modular can cost as much as custom stick-built. So modular typically offers modest cost savings (often 10-20% on the structure) plus significant time savings and predictability, but it's not always a huge discount once everything is included. The faster timeline, predictable factory pricing, and quality control are often as valuable as the cost savings. For budget-conscious buyers wanting a faster, efficient build, modular is attractive. This calculator estimates the all-in modular cost so you can compare.

A common mistake when budgeting a modular home is focusing only on the manufacturer's base module price and underestimating the substantial 'site costs' needed to make it a finished, livable home — these can add 30-50% or more on top of the module price. The major site costs include: Land — buying the lot (not included in construction estimates). Site preparation — clearing, grading, and preparing the site for the home and access for delivery trucks and a crane. Foundation — building a permanent foundation (slab, crawl space, or basement) for the modules to sit on, which is a significant cost (this calculator offers a foundation add-on). Delivery and set — transporting the modules to the site (sometimes long distances) and using a crane to set them on the foundation (this calculator offers a transport-and-crane add-on). Utility connections — connecting water, sewer or septic, electricity, and gas, which can be expensive especially in rural areas (this calculator offers a utility-connection add-on). 'Button-up' / finishing — completing the on-site work where modules join (sealing seams, finishing the roof line, connecting systems, interior touch-ups). Design and permits — architectural/engineering and permitting fees (offered as an add-on). Plus extras like a garage, porch/deck, driveway, and landscaping. So the turnkey cost is the module price plus all these site costs. When budgeting, always account for the full picture, not just the factory quote. This calculator includes these major site costs as add-ons so you can build a realistic total.

One of the biggest advantages of modular homes is speed — they're typically much faster to complete than stick-built homes because the factory construction and site work happen in parallel. The factory build of the modules usually takes about 1 to 3 months (often 4 to 12 weeks) once the design is finalized and ordered, during which the modules are constructed indoors regardless of weather. Meanwhile, the site work — preparing the lot, building the foundation, and running utilities — happens concurrently. Once the modules are complete and the foundation is ready, delivery and setting the modules with a crane takes just a day or a few days. Then the on-site 'button-up' and finishing work — joining the modules, completing the roof, connecting systems, and final interior/exterior finishing — typically takes a few weeks to a couple of months. So from order to move-in, a modular home often takes about 3 to 6 months total, compared to 6 to 12+ months for a comparable stick-built home. This faster timeline is a major benefit: it reduces construction-loan interest, gets you into the home sooner, and the factory construction avoids the weather delays that plague site-built homes. That said, the design/planning phase and permitting beforehand, plus site-specific challenges, can add time, and popular manufacturers may have a queue. Overall, modular homes are prized for their speed and predictability. This calculator estimates the cost; your modular home builder can provide a project-specific timeline based on the home, site, and their schedule.

Yes, modern modular homes can be quite customizable, dispelling the myth that they're all cookie-cutter — though the degree of customization depends on the manufacturer and the class of home. Most modular home companies offer a range of floor plans/models that can be modified, and many allow you to customize layouts (combining or adjusting rooms), exterior styles and finishes (siding, roofing, porches), interior finishes (cabinets, countertops, flooring, fixtures, paint), and features (fireplaces, kitchen islands, bathroom configurations). Multi-section and especially custom modular homes (this calculator's custom-modular class) offer extensive design flexibility — you can work with the manufacturer or a designer to create a custom home built modularly, achieving looks comparable to custom stick-built homes. Higher-end modular builders produce architecturally striking, fully custom homes. The constraints come from the modular construction method: modules must be sized to be transported on trucks (width and height limits for road transport) and craned into place, which influences room dimensions and how the home is divided into modules, and very complex or unusual geometries may be harder to achieve modularly. But within those practical constraints, there's substantial room to personalize. So while there are some design parameters dictated by the factory/transport process, modular homes today offer far more customization than many people expect, ranging from modifying standard plans to fully custom designs. This calculator's module-class and finish-level options reflect the range from economical standard homes to premium custom modular. Discuss customization options with your chosen manufacturer.

Yes, modular homes generally hold their value comparably to stick-built homes and qualify for standard home financing, which is an important distinction from manufactured (mobile) homes. Value/appreciation: because modular homes are built to the same local building codes as site-built homes, set on permanent foundations, and are essentially indistinguishable from stick-built homes once installed, they're appraised and treated as real property like any conventional house, and they appreciate (or depreciate) based on the same market factors — location, condition, size, and local real estate trends — rather than depreciating like a vehicle. A quality modular home in a good location holds its value well. This is different from manufactured/mobile homes, which can depreciate, especially if on leased land or a non-permanent foundation. Financing: modular homes qualify for conventional mortgages (and FHA, VA, etc.) just like site-built homes, since they're real property on a permanent foundation — you typically use a construction loan during the build that converts to a standard mortgage, similar to building a stick-built home. (Manufactured homes, by contrast, may require different, sometimes costlier financing like chattel loans.) Appraisers and lenders treat code-compliant modular homes on permanent foundations as conventional homes. So modular homes offer the financing accessibility and value retention of traditional homes, combined with the cost and time efficiencies of factory construction. This makes them a sound choice. This calculator estimates the construction cost; consult lenders for financing specifics. The key is that modular (built to local code on a permanent foundation) is treated like a regular house, unlike manufactured homes.

Modular homes are placed on permanent foundations (a key feature distinguishing them from mobile/manufactured homes on temporary supports), and the foundation type depends on your preferences, site, and climate — the main options are similar to those for stick-built homes. A slab foundation (a concrete slab poured on the ground) is the most economical and common in warm climates without freezing concerns; the home sits directly on the slab. A crawl space foundation raises the home on short foundation walls with a crawl space underneath, providing access to utilities/plumbing and some protection from ground moisture, common in many regions. A full basement foundation provides a basement level below the home — the most expensive option but adds significant usable or storage space and is common in colder climates (where foundations must extend below the frost line anyway, making a basement cost-effective to add). The foundation is a substantial separate cost from the modules (this calculator offers a foundation/basement add-on), and it must be built to support the modular home and meet local codes, including proper depth for the climate (below frost line where applicable). The modules are then craned onto and secured to this permanent foundation. The foundation choice affects cost (slab cheapest, basement priciest), the home's relationship to the ground, and available space. Your modular home builder and local codes will guide the appropriate foundation. This calculator includes a foundation add-on so you can account for this essential, significant cost beyond the modules.