Mobile Home Window Replacement: What Is Different

A mobile home window is usually not a house window. Manufactured homes are built in a factory to a federal standard, the HUD code in 24 CFR Part 3280, and their windows are rated for the home's wind zone, sized to the factory's openings and often fastened with a flange over the siding ^{1 7}. A standard replacement window from a house-window line may not fit the opening or the wall depth without changes to the framing.

So mobile home window replacement starts with identifying how the existing window is mounted and measuring the opening and depth, then ordering a window built for manufactured housing or a made-to-size insert. Bedroom windows also have exit-size rules in the HUD code (24 CFR 3280.404), set out below ².

Why manufactured-home windows differ

Three things set them apart:

• How they mount. Many mobile home windows attach from the outside, with a flange that overlaps the siding ⁷. Others are inserts, measured from inside, jamb to jamb ⁷. Tell the supplier which kind you have.
• Depth. The window frame's depth has to suit the opening and wall. Mobile Home Parts Store, a parts retailer, says most replacement mobile home windows need about 3¼ inches of depth ⁷.
• Sizes. Openings were cut to the home builder's sizes, not to a house-window maker's chart. The same retailer mentions 30 by 60 and 36 by 54 inches as common sizes but calls them guidelines and says your own opening is the only size that matters ⁷. Our standard window sizes article explains why size codes vary even among house-window makers.

The wind rating can differ too. The HUD code requires primary windows in a manufactured home to meet the AAMA 1701.2 or AAMA/WDMA/CSA 101/I.S.2/A440 standard at the design wind loads for the home's wind zone, and to carry a quality label from an accredited product certification body (24 CFR 3280.403) ¹.

Where the HUD code applies

The HUD code governs how the home is built at the factory. HUD says all manufactured homes built in the U.S. after June 15, 1976 must carry a red certification label (the "HUD tag") on each transportable section, the manufacturer's statement that the section was built to HUD's standards (HUD homeowner resources) ⁵. HUD also says owners should be able to make repairs, and suggests checking with the retailer or manufacturer first if a repair could affect the home's warranty ⁵.

The rules that most affect a window choice are these, from 24 CFR 3280:

• Window performance. Primary windows must meet the standards named above at the wind loads in § 3280.305, and sealed insulating glass must meet a durability class and carry the glass maker's name (§ 3280.403) ¹.
• Bedroom exit windows. Every room built for sleeping must have an exit door or at least one outside window or approved exit device that meets § 3280.404, with the bottom of the opening no more than 36 inches above the floor and the latches and handles needed to open it no higher than 54 inches (§ 3280.106) ³. Integral rolled-in screens are not allowed in an egress window unless the window is hinged ³.
• Exit opening size. An egress window must open to at least 20 inches of clear width and 24 inches of clear height, with a clear opening of at least 5 square feet, by normal operation and without tools; a window that has to have its sash removed to reach that size is not allowed (§ 3280.404) ². Each egress window carries operating instructions marked "Do Not Remove" ².

How these factory rules apply to a window replaced years after the home was sited may depend on your state. Many states have a State Administrative Agency that works with HUD on manufactured housing, and HUD's State Administrative Agencies page lists the contacts; HUD itself handles 17 states that have none ⁶. That office, or your local building department, is the place to ask.

Find the data plate first

Every manufactured home must have a data plate near the main electrical panel or another easy-to-see spot, listing the plant, the serial number and model, the date of manufacture, and the wind zone the home was designed for (24 CFR 3280.5) ⁴. The plate also says whether the home was equipped with storm shutters or other protective coverings for windows ⁴. The wind zone matters when choosing a replacement, since the window's rating was set for it ¹. A photo of the plate is useful to give the window supplier or installer.

What to measure before ordering

Mobile Home Parts Store's sequence ⁷:

1. Width. Measure at the top, middle and bottom; keep the smallest.
2. Height. Measure at the left, center and right; keep the smallest.
3. Depth. For an insert, measure from the inside stop to the outside stop.
4. Square. Measure both diagonals; if they differ by more than ¼ inch the opening is out of square. Check the sill and jambs with a level.

Also note:

• the mounting style (flange over the siding, or an insert);
• the wall thickness at the opening, measured with the trim off if possible;
• the window type (single-hung, slider, awning or picture) and which rooms are bedrooms;
• the frame color and whether there is a storm window or exterior trim.

Mobile Home Parts Store notes that frames in older mobile homes can shift slightly, which is another reason to measure in several places ⁷.

Choosing who does it

Some window installers work on manufactured homes and some do not, so ask early. Useful questions: Do you install windows in manufactured homes, and how often? Will the replacement be a manufactured-housing window or a custom insert? Does it keep the bedroom exit size? Who orders the window, and what happens if it does not fit? Is the installer licensed for this work in your state? State pages such as Florida and Oregon link the board's lookup, and how to choose a window installer covers the rest. For costs, window replacement cost sets out what the national surveys report for house windows, and vinyl window replacement cost covers the most common frame. When you are ready, you can compare quotes from window installers.

About these figures

• ¹ Official record: 24 CFR 3280.403, window standards, wind loads, sealed glass and the quality label requirement, eCFR up to date as of October 23, 2026, checked October 26, 2026.
• ² Official record: 24 CFR 3280.404, egress window clear width of 20 inches, height of 24 inches and opening of 5 square feet, operation and instructions, checked October 26, 2026.
• ³ Official record: 24 CFR 3280.106, egress windows in sleeping rooms, 36-inch sill height, 54-inch hardware height and the rolled-in screen rule, checked October 26, 2026.
• ⁴ Official record: 24 CFR 3280.5, data plate location and contents, checked October 26, 2026.
• ⁵ Official record: HUD's manufactured housing homeowner resources (June 15, 1976 certification, HUD tag, repairs), checked October 26, 2026.
• ⁶ Official record: HUD's State Administrative Agencies page (contacts, and the 17 states handled by HUD), checked October 26, 2026.
• ⁷ Reported: Mobile Home Parts Store's mounting types, measuring steps, 3¼-inch depth, common sizes and note on older frames, posted August 15, 2025, checked October 26, 2026.