A single-section home, often called a single-wide, is a manufactured house built entirely in a factory and delivered to its site as one complete unit on a single steel chassis. These homes typically measure 14 to 18 feet wide and 50 to 80 feet long, giving roughly 700 to 1,440 square feet of living space. Every single-section home built since June 15, 1976, has to meet the federal Manufactured Home Construction and Safety Standards, known as the HUD Code, which sets a single national standard for structural strength, fire safety, plumbing, electrical work, and energy performance.
Size, Weight, and the Width Limit
The 14-to-18-foot width ceiling isn’t a design preference. It exists because the home has to travel down public highways in one piece. The federal standard width for vehicles is 102 inches (8.5 feet), so any manufactured home needs an oversize-load permit for transport, and states cap how wide a load can be even with a permit.
The resulting floor space depends on the width-and-length combination. A 14-by-56-foot model gives about 784 square feet. An 18-by-80-foot layout pushes close to 1,440. Federal rules require a manufactured home to be at least 320 square feet to qualify as a dwelling unit under the HUD program.1HUD.gov. Manufactured Housing Homeowner Resources
The entire structure sits on a permanent steel chassis that stays with the home for life. The frame keeps the home rigid during highway transport and acts as the structural backbone once the home is set on its foundation. Total weight runs between 35,000 and 60,000 pounds depending on size and materials.
How a Single-Section Compares to a Double- or Triple-Wide
The “single” in single-section means one transportable unit. A double-wide arrives as two separate halves, each on its own chassis, and the halves are joined on-site along a center seam called a marriage wall. Triple-section homes use three pieces. For a buyer deciding between them, four differences matter:
- Width. Single-section homes top out around 18 feet. Multi-section homes typically span 20 to 36 feet because each half can be up to 18 feet wide.
- Square footage. A double-wide can reach 2,500 square feet or more, roughly double the ceiling of a single-section.
- Cost. Multi-section homes generally cost close to twice as much because they take roughly double the materials and labor, plus on-site assembly.
- Installation. A single-section home arrives ready to set on its foundation. Multi-section homes need crews to align and permanently join the sections, seal the marriage wall, and finish the interior seam.
The average sale price for a new single-wide was approximately $87,900 as of the most recent Census Bureau data, compared to roughly $126,800 for all manufactured home types combined. That price gap is why single-section homes remain popular with first-time buyers, retirees downsizing, and anyone prioritizing affordability over floor space.
What HUD Code Construction Actually Covers
Every manufactured home sold in the United States must comply with the federal construction and safety standards, codified at 24 CFR Part 3280.2eCFR. 24 CFR Part 3285 – Model Manufactured Home Installation Standards Site-built houses follow state and local building codes that vary by jurisdiction; manufactured homes follow one national standard administered by HUD. That’s what people mean when they call something a “HUD Code home.” Factory inspectors verify compliance before the home is cleared for sale or transport.
Homes built before June 15, 1976 were constructed under older, less rigorous rules, and are sometimes called “mobile homes” to distinguish them from modern manufactured housing. The distinction matters for financing and insurance.
Wind Zones
The HUD Code splits the country into three wind zones, and a home has to be designed for the zone where it will be placed. You cannot install a home in a zone that exceeds its design rating.
- Wind Zone I covers most of the continental U.S. Homes must handle horizontal wind loads of at least 15 pounds per square foot and net roof uplift of at least 9 pounds per square foot.
- Wind Zone II covers high-wind areas and is designed for 100 mph wind speeds.
- Wind Zone III covers the highest-wind coastal areas and is designed for 110 mph wind speeds.
Homes rated for Zone II or Zone III must have their wind-resisting components, including walls, roof trusses, sheathing, and anchoring systems, engineered by a professional engineer or architect to handle those pressures.3eCFR. 24 CFR 3280.305 – Structural Design Requirements Zone II and Zone III homes placed within 1,500 feet of the coastline need additional engineering for a higher wind exposure category.
Energy and Insulation
Manufactured homes also have to meet federal energy performance standards tied to three climate zones. Homes going to colder regions need thicker insulation in the walls, ceiling, and floor, along with better-performing windows and doors. For single-section homes, the overall thermal transmittance (a measure of how much heat escapes through the entire building envelope) ranges from a maximum of 0.110 in the warmest climate zone down to 0.074 in the coldest.4eCFR. 10 CFR Part 460 Subpart B – Building Thermal Envelope The data plate inside every home identifies which climate zone it was built for, so a buyer in a cold region can confirm the home has appropriate insulation before purchasing.
Exits
Each single-section home must have at least two exterior doors positioned at least 12 feet apart, center to center, measured in a straight line.5eCFR. 24 CFR 3280.105 – Exit Facilities; Exterior Doors Neither door can sit inside a room that requires passing through a lockable interior door to reach it. At least one exit must be reachable from each bedroom doorway within 35 feet of walking distance. The main egress door must provide a clear opening of at least 32 inches wide by 74 inches high.
The Certification Label and Data Plate
Two documents separate a HUD Code home from any other kind of housing: the certification label on the outside and the data plate on the inside. Both are required by federal law. Losing either one creates problems when you try to sell, finance, or insure the home.
The certification label (often called the “red label” or “HUD label”) is a small aluminum plate, roughly two by four inches, permanently riveted to the exterior. A single-section home has one label, placed at the tail end about one foot up from the floor and one foot from the road side.6eCFR. 24 CFR Part 3280 – Manufactured Home Construction and Safety Standards – Section 3280.11 The label certifies that the home was inspected and built in conformance with the federal standards in effect on its date of manufacture. Without it, most lenders will not finance the home, and many states will not allow it to be titled.
The data plate is a paper document, standard letter size, affixed inside the home. It records far more detail than the exterior label:7HUD.gov. Manufactured Housing HUD Labels factory name, address, serial number, model, and date of manufacture; the wind zone and roof load zone the home was engineered for, with maps; major factory-installed appliances with their manufacturer and model numbers; whether the home was designed to support an attached structure like a carport or porch; whether it came equipped with storm shutters; and the certification label number linking the interior record to the exterior label.
If you’re buying a used single-section home, checking the data plate is one of the first things to do. It tells you whether the home is rated for your area’s wind and snow loads, what appliances were original, and whether it was designed to accept additions. A missing label or data plate can signal that the home has been altered in ways that void its federal compliance, which can disqualify it from FHA financing, conventional lending, and some insurance coverage.
Interior Layout
The narrow footprint forces a linear floor plan, and that constraint produces some practical advantages. Most layouts put the living room and kitchen in the center, with bedrooms at opposite ends. There are no hallways eating up square footage, and no marriage wall seam running down the middle. Windows on both long walls bring in natural light and cross-ventilation that interior rooms of wider homes often don’t get.
Two- and three-bedroom plans are common, and some single-section models fit a primary suite with a walk-in closet at one end. The trade-off is room width. A 14-foot-wide home gives rooms roughly 13 feet across at most. An 18-foot-wide model buys meaningful breathing room.
Transport and Site Installation
Moving a single-section home from factory to site is more involved than it looks. A heavy-duty truck connects to the home’s integrated chassis, which has temporary axles and wheels attached for the trip. Every state requires a special transport permit because the load exceeds the standard federal width limit of 102 inches.8FHWA. Oversize/Overweight Load Permits The federal government does not issue these permits; you or your transporter has to get one from each state the home passes through.
Transport costs generally run between $1.50 and $15.00 per mile depending on distance, route complexity, and whether escort vehicles are required. Longer multi-state hauls add up quickly, which is why most buyers purchase from a factory or dealer within a few hundred miles of their site.
Once the home reaches its site, crews position it over a prepared foundation. Options include concrete piers, a concrete slab, or a perimeter foundation with a crawl space. The home is leveled and then anchored using a system engineered for the wind zone shown on the data plate.2eCFR. 24 CFR Part 3285 – Model Manufactured Home Installation Standards Homes in Wind Zones II and III cannot be placed within 1,500 feet of the coastline unless they have been specifically designed and anchored for that higher-exposure environment.3eCFR. 24 CFR 3280.305 – Structural Design Requirements
After anchoring, workers remove the temporary wheels and towing hitch, connect plumbing and electrical to site utilities, and a certified installer inspects the final setup. Professional installation typically costs between $2,000 and $20,000 depending on foundation type, local labor rates, and site conditions.
Titling and Financing
How a single-section home is classified legally, as personal property or real property, drives almost everything about how you finance, insure, and pay taxes on it. This is where manufactured housing gets more complicated than most buyers expect.
Personal Property
A manufactured home sitting on rented land, like a lot in a manufactured home community, is usually classified as personal property and titled through the state’s motor vehicle department, similar to a car. Financing typically comes through a chattel loan, which carries higher interest rates and shorter repayment terms than a traditional mortgage. You pay personal property taxes rather than real estate taxes, and the home generally does not appreciate the way real property does.
Real Property
If you own the land underneath the home and permanently affix the home to a qualifying foundation, most states let you convert the classification to real property. The process varies by state but generally involves surrendering the vehicle title, recording a document with the county (often called a certificate of permanent location or affidavit of affixation), and having the foundation verified by a local building official. Once converted, the home is taxed as real estate, can be financed with a conventional mortgage at lower interest rates, and builds equity the same way a site-built home does. Traditional mortgage rates can run several percentage points below chattel rates, and lenders are more willing to offer 20- or 30-year terms on real property. Real estate taxes, assessed on both the home and the land, will typically be higher than the personal property tax alone.
FHA Loans
The Federal Housing Administration will insure loans on manufactured homes, but single-section homes face some restrictions worth knowing. The FHA’s One-Time Close construction-to-permanent loan program does not cover single-section homes. To qualify for other FHA financing, the home must have been built after June 15, 1976, carry a HUD certification label, contain at least 400 square feet of living space, and be classified as real estate on a permanent foundation. Buyers who don’t meet those criteria may still qualify for an FHA Title I loan, which covers manufactured homes classified as personal property, with lower maximum loan amounts and shorter terms.
Zoning and Placement
Where you can put a single-section home comes down to local zoning, and this is where many buyers get surprised. Some municipalities restrict manufactured housing to designated communities or specific zoning districts. Others allow them on any residential lot, sometimes with conditions like minimum roof pitch, exterior finish requirements, or foundation standards.
Federal law gives one important protection. A local government cannot ban HUD Code homes solely because they were built to the federal standard rather than a state or local building code.9GovInfo. Manufactured Housing Statement of Policy 1997-1 – State and Local Zoning Determinations Involving HUD-Code If a locality permits structures built to the local code on a given lot, it cannot exclude an otherwise equivalent manufactured home just because it carries a HUD label. Localities still keep broad authority over general land-use decisions. They can set lot size minimums, setbacks, and aesthetic standards, and they can limit manufactured housing to certain zones as long as those limits don’t single out HUD Code homes.
Check with your local planning or zoning office before purchasing. Discovering after the fact that your lot doesn’t permit manufactured housing is an expensive mistake.
Modifications After Purchase
Once a single-section home leaves the factory, any structural alteration has to clear a higher bar than most owners expect. If an installation or modification requires a design different from what the manufacturer provided, the new design has to be prepared and certified by a professional engineer or registered architect, then approved by both the manufacturer and the original Design Approval Primary Inspection Agency.10Federal Register. Manufactured Home Construction and Safety Standards (Final Rule) The modified design must provide at least the same level of protection as the original federal installation standards.
Cosmetic changes like replacing flooring, updating cabinets, or repainting are generally straightforward. Structural work like adding a room, cutting a new window opening, or modifying the roof triggers the engineering requirement. If the home has a factory-installed fire sprinkler system, even changes to the water supply need to go through the manufacturer or a fire protection technician first. Before starting any significant renovation, check the data plate for whether the home was designed to accept attached structures, and keep records of any professional certifications for the work. Future buyers and lenders will want that documentation.