How long does it take to build a prefab home?
Last updated November 2, 2026 · Prices from 1,645 Structofy listings
Factory construction of a prefab or modular home often takes weeks rather than months, but the full project from contract to move-in commonly runs several months to a year once design, permits and site work are included. Permits and site preparation, not the factory, are usually what decide your timeline.
A typical timeline, step by step
Every builder and site is different, so treat these stages as a general guide rather than a promise. Ask each builder for their current factory schedule, because production backlogs change over time.
| Stage | What happens | What drives the time |
|---|---|---|
| Choose a plan and builder | Compare models, get quotes, sign a contract | How many options you change |
| Design and engineering | Final drawings, site plan, engineering for your lot | Customization and site complexity |
| Permits and approvals | Local building permit; state approval of plans in many areas | Your local building department |
| Factory production | Home is built indoors while site work proceeds | Factory backlog and home size |
| Site preparation | Clearing, foundation, utilities, driveway | Weather, soil, access, contractor availability |
| Delivery and set | Modules trucked in and craned onto the foundation | Route permits and crane scheduling |
| Finish work | Joining sections, utility hookups, decks, final inspection | Scope of on-site work |
Why prefab can be faster
The biggest time saving comes from doing two things at once: the factory builds the home while your contractor prepares the site. With a site-built home those steps happen one after the other.
Factory crews also work indoors, so rain, snow and heat cause fewer delays, and repeatable processes make each stage more predictable. Once modules arrive, a modular home is often set on its foundation in a matter of days.
What usually slows things down
- Permits. Review times vary a lot between towns, and plans may need state approval too.
- Financing. Construction loans take time to close, and factories may wait for the deposit.
- Site surprises. Rock, poor soil, wells, septic systems and long utility runs add weeks.
- Changes. Late design changes can push a home back in the factory queue.
- Weather on site. Foundations and crane days still depend on the weather.
Does home size or type change the timeline?
Smaller homes are generally quicker to build and deliver. Tiny houses on Structofy have a median size of around 400 square feet, while modular listings have a median size of around 1,577 square feet, and larger multi-section homes need more factory time and more on-site finishing.
Here is how listings break down by size on Structofy, which gives a sense of the scale of homes being built.
| Group | Listings | With a price | Lowest | Median | Highest | Median $/sq ft | Median size |
|---|---|---|---|---|---|---|---|
| Under 400 sq ft | 34 | 25 | $17,702 | $85,000 | $234,800 | $290 | 304 sq ft |
| 400–799 sq ft | 113 | 45 | $21,908 | $136,000 | $310,000 | $242 | 600 sq ft |
| 800–1,199 sq ft | 316 | 36 | $79,900 | $185,000 | $405,900 | $204 | 1,053 sq ft |
| 1,200–1,799 sq ft | 556 | 39 | $100,595 | $345,000 | $500,000 | $261 | 1,493 sq ft |
| 1,800–2,499 sq ft | 386 | 66 | $121,754 | $273,000 | $657,800 | $132 | 2,058 sq ft |
| 2,500+ sq ft | 142 | 69 | $156,788 | $375,000 | $990,000 | $130 | 3,000 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.
How to keep your project on schedule
- Talk to your building department before you sign, and ask what they need for a factory-built home.
- Line up financing early, including how the factory deposit will be paid.
- Lock in your design before production starts.
- Hire a site contractor who has worked with modular or prefab homes.
- Confirm delivery access: road widths, turns, overhead wires and a crane pad.
Planning to compare costs as well? Read how much a prefab home costs and the hidden costs to budget for.
Frequently asked questions
How long does it take to build a modular home in the factory?
Factory build time is often measured in weeks, depending on home size and the factory's backlog. Ask the builder for a current production estimate.
How long does it take to set a modular home on site?
Setting the modules on the foundation is commonly done within a few days, followed by on-site finishing that can take several more weeks.
Is prefab faster than site-built construction?
Often, because the home is built while the site is prepared. Overall savings depend mainly on permits and site work.
What is the longest part of building a prefab home?
For many projects it is design approval and permitting, followed by site preparation, rather than the factory build itself.
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.