Modular Homes: Factory-Built, But Built to Local Code

The Distinction That Gets Confused Most Often

Modular and manufactured homes are frequently used interchangeably, and they shouldn't be. A modular home is built in one or more finished sections inside a factory, transported to your site, and set by crane onto a permanent foundation -- but it is designed and constructed to meet or exceed the same state or local building code that governs a stick-built home, most commonly a version of the International Residential Code (IRC) adopted by your state. It is not built to a federal standard, and the US Department of Housing and Urban Development (HUD) does not regulate modular construction at all.

That's the opposite of a manufactured home, which is built entirely to the federal HUD Code (24 CFR Part 3280) and arrives on a permanent steel chassis. If your builder, plan, or listing describes a home as "modular," it should be going through the same local plan review and inspection process as any site-built house -- if it isn't, that's worth clarifying before you sign anything. See our companion guide to manufactured homes for the federal side of this distinction.

Because It's Coded Like a Site-Built Home, It's Zoned Like One Too

Because modular construction meets the same code as site-built housing, most local zoning ordinances don't single it out or restrict it separately -- if stick-built single-family homes are a permitted use on your parcel, a modular home generally is too, subject to the same setbacks, minimum square footage, and design requirements everyone else follows. That's a meaningfully different starting position than a manufactured home, which many zoning ordinances and deed restrictions do call out specifically. Still confirm directly with your county: some jurisdictions maintain outdated ordinance language that lumps all factory-built housing together, which can create friction even when the modern code doesn't require it.

Deed restrictions carry the same logic. Courts have generally held that a restriction banning "mobile homes" or "manufactured homes" does not automatically extend to a modular home built to the same code as a site-built house -- restrictions are interpreted strictly, so if modular construction isn't named specifically, it typically isn't prohibited. Read your actual recorded covenants rather than relying on that general pattern, since language varies. See our national guide to deed restrictions.

What Still Has to Happen On-Site

The modules arrive largely finished -- framing, wiring, plumbing rough-ins, and often interior fixtures already installed -- but a permanent foundation, final utility connections, and the crane-set and stitching of sections together still happen on site, and all of it goes through your normal local building department inspections, the same as a stick-built home. This means everything covered in our guide to building on raw land -- site access for a crane and delivery truck, a completed foundation, well or public water, and a passed septic or sewer connection -- has to be in place before the modules can be set.

Financing Follows Standard Mortgage Rules

Because a modular home is real property on a permanent foundation and built to the same code as a site-built house, it's generally eligible for the same conventional, FHA, VA, and USDA mortgage products as any other single-family home, unlike a manufactured home, which sometimes requires chattel (personal property) financing depending on how it's titled. Lenders will still want to see engineered plans and a builder or factory with a track record, and construction-to-permanent financing works the same way it would for a stick-built house. See our national guide to land financing.