What are the hidden costs of a prefab home?
Last updated November 2, 2026 · Prices from 1,645 Structofy listings
The biggest costs a prefab price usually leaves out are land, the foundation, delivery and crane set, utility connections, permits, and on-site finish work. With the median home listing on Structofy asking $260,000 for the structure, these extras can add a large share again on top, so budget for them from day one.
Why the sticker price is not the final price
Prefab builders price what they control: the home built in their factory. Everything that happens on your land depends on your site, your town and local contractors, so it is usually quoted separately or left to you.
Of the 1,590 home listings on Structofy, 289 publish a price, and those prices describe the home, not the finished project.
| Group | Listings | With a price | Lowest | Median | Highest | Median $/sq ft | Median size |
|---|---|---|---|---|---|---|---|
| All home listings | 1,590 | 289 | $15,555 | $260,000 | $1,033,995 | $171 | 1,499 sq ft |
| Modular | 232 | 46 | $59,905 | $289,000 | $990,000 | $300 | 1,577 sq ft |
| Pre-fab house | 304 | 96 | $17,702 | $216,000 | $1,033,995 | $141 | 1,900 sq ft |
| Tiny house | 59 | 40 | $15,555 | $97,000 | $274,800 | $258 | 400 sq ft |
Source: 1,645 home listings on Structofy, as published by each builder, read when this page loads. Prices are the builder’s listed base price; listings without a price are counted but not used for price figures. Median means half the listings cost less and half cost more. These are listing prices, not finished project costs.
The checklist
| Cost | What it covers | What makes it go up |
|---|---|---|
| Land | Buying a buildable lot | Location, size, lack of utilities |
| Surveys and soil tests | Boundary survey, perc test, geotechnical report | Rural sites, septic needs, slopes |
| Site preparation | Clearing, grading, driveway, crane pad | Trees, rock, slopes, long driveways |
| Foundation | Slab, crawlspace, basement or piers | Basements, poor soil, frost depth |
| Delivery | Trucking modules from the factory | Distance, escorts, route permits |
| Crane and set | Placing modules on the foundation | Crane size, access, number of modules |
| Utilities | Water, sewer or septic, electric, gas | Wells, septic systems, long runs |
| Permits and fees | Building permit, plan review, impact fees | Local fee schedules |
| Button-up and finish | Joining modules, trim, final hookups | Number of sections, builder scope |
| Exterior extras | Decks, porches, garage, landscaping | Your wish list |
Land and site preparation
If you do not already own land, it is often the single largest cost after the home. Even on land you own, expect costs for surveys, clearing and grading, and a driveway strong enough for delivery trucks and a crane.
Rural land may need a well and septic system, and a perc test to show the soil can handle septic, so get those checked before you buy a lot.
Foundation, delivery and set
Modular homes sit on permanent foundations, and the type you choose matters: a basement costs more than a crawlspace or slab but adds usable space. Manufactured homes may use piers or a permanent foundation depending on financing and local rules.
Delivery cost rises with distance from the factory, so a nearby builder can save real money. Ask each builder for their delivery radius and whether their quote includes trucking, the crane and the set crew. You can browse builders by location on our builders directory.
Utilities, permits and finish work
Connecting to public water and sewer is often cheaper than drilling a well or installing septic, but connection fees vary by town. Bringing power to a remote site can also be expensive.
Permits, plan review and impact fees are set locally; your building department can give you a fee estimate. Finally, the "button-up" work of joining modules, plus decks, steps and landscaping, can be included by the builder or left for you to hire out.
How to budget without surprises
- Get the builder quote in writing and mark every item that is excluded.
- Have a local contractor price the site work after a site visit.
- Call your building department for permit and fee estimates.
- Keep a contingency of 10–15% of the total for the unexpected.
- Compare all-in totals, not sticker prices, when choosing between builders.
Next, see what prefab homes cost and how to finance one.
Frequently asked questions
Does the price of a modular home include the foundation?
Usually not. Most builders quote the home itself, and the foundation is built on site by a local contractor or dealer.
Is delivery included in prefab home prices?
Sometimes. Some builders include delivery within a set radius, while others charge separately. Always ask.
How much should I budget for site work?
It varies widely by site. A flat lot with nearby utilities costs far less than a remote, sloped lot needing a well and septic, so get a local site estimate.
What is "button-up" on a modular home?
Button-up is the on-site work of joining modules, finishing seams, trim and final connections after the home is set.
Keep exploring
Structofy is a directory of factory-built homes and does not build, sell or finance homes. General information on this page is not financial, legal or building advice; confirm details with builders, lenders and your local building department.