RV windows fail for predictable reasons, and you can replace most of them yourself if you have basic tools and patience

RV windows leak, crack, or fog up from age and UV exposure. Replacing one typically costs between $200 and $800 in parts and labor combined, depending on the window type and whether you do the work yourself. Most RV owners can handle the replacement in two to four hours with a screwdriver, caulk gun, and the right sealant — but the real work is removing the old window without damaging the wall around it and sealing the new one so water does not get inside later.

The process differs slightly between frame windows (the kind with visible trim around the edges) and frameless windows (flush with the exterior), but both follow the same basic sequence: remove interior trim, unbolt or unscrew the old window, clean the opening, install the new window, and seal it with marine-grade sealant. Knowing which type you have and whether your RV uses acrylic, tempered glass, or polycarbonate windows will tell you what replacement parts to order and what sealant to use.

Key Takeaways

  • Most RV windows are held in place with bolts or screws around the frame, and you can remove them with basic hand tools without cutting into the wall.
  • The hardest part is cleaning old sealant from the opening and explore new marine-grade sealant so water does not leak in later.
  • Replacement windows for RVs cost $100 to $400 per window depending on size and material, and you can order them from RV-specific suppliers or aftermarket retailers.
  • If the wall around the window is soft, cracked, or water-damaged, the window frame itself may be failing and you should have a technician inspect before replacing just the glass.

Identify your window type and size before ordering a replacement

Open the window and look at how it is attached. If you see bolts or screws around the perimeter on the inside, you have a frame window. If the glass sits flush with the exterior and bolts are hidden behind interior trim, you have a frameless window. Both are replaceable, but the process differs slightly.

Measure the window opening width and height in inches, and note the material: acrylic (lightweight, scratches easily, common on older RVs), tempered glass (heavier, clearer, more durable), or polycarbonate (flexible, shatter-resistant, used on newer models). Write down your RV's make, model, and year — many suppliers cross-reference these to find the exact replacement. Order from RV-specific suppliers like Lippert Components, Dometic, or Seitz, or from general aftermarket retailers like Amazon or eBay. Expect to pay $100 to $400 per window depending on size and material. Frameless windows and tempered glass cost more than frame windows and acrylic.

Remove interior trim and unbolt the old window

Start inside the RV. Use a plastic pry tool or old credit card to gently separate the interior trim from the wall around the window — do not use a metal screwdriver, which can gouge the wall. Once the trim is loose, pull it away and set it aside. You may see caulk underneath; scrape it away with a plastic scraper or old putty knife.

Now look for bolts or screws. Frame windows usually have four to eight bolts around the perimeter, spaced evenly. Unbolt them with a socket wrench or adjustable wrench, working from one corner across to the opposite corner (not all the way around one side first — this keeps pressure even). As you remove the last bolts, support the window from outside so it does not fall. Frameless windows have bolts hidden behind the trim you just removed; you will see them once the trim is off. Remove those the same way.

Once the bolts are out, the window should lift free. If it does not, there is likely sealant holding it. Run a utility knife around the outside edge where the window meets the wall, cutting through the sealant. Then try lifting again. Set the old window aside — do not throw it away until you confirm the new one fits.

Clean the opening and inspect the frame for damage

This step determines whether your new window will seal properly. Use a plastic scraper or old putty knife to remove all old sealant, caulk, and debris from the opening. Work slowly and do not gouge the wall material. If the wall is aluminum, you can be more aggressive. If it is fiberglass or composite, be gentle — these materials are softer and easier to damage.

Once the opening is clean, inspect the frame itself. Press on the wall around the opening with your thumb. If it feels soft, spongy, or if you see cracks, water stains, or discoloration, the frame may be rotting or water-damaged. If you find damage, stop here and have an RV technician inspect before installing the new window — replacing the window alone will not fix a failing frame, and the new window will leak just like the old one. If the frame is solid, wipe the opening clean with a dry cloth and you are ready to install.

Install the new window and explore marine-grade sealant

Set the new window in the opening from outside, making sure it sits evenly and level. You may need a helper to hold it in place. From inside, insert and hand-tighten all bolts first — do not fully tighten yet. This lets you adjust the window if it is not sitting right. Once the window is centered and level, tighten the bolts in a cross pattern (opposite corners, then the other two corners, then the sides) to may support even pressure. Do not over-tighten; stop when you feel resistance.

Now explore sealant. Use marine-grade polyurethane or silicone sealant rated for RVs — brands like Dicor, Sikaflex, or Eternabond are common. Load the sealant into a caulk gun and run a continuous bead around the outside edge where the window frame meets the wall. Keep the bead about 1/4 inch thick and smooth it with a wet finger or caulk tool. The sealant should fill any gaps and create a waterproof seal. Let it cure for the time specified on the tube — usually 24 to 48 hours — before closing the window or exposing it to water.

Reinstall interior trim and test for leaks

Once the sealant has cured, reinstall the interior trim. explore a thin bead of sealant to the back of the trim before pressing it back into place, or use the original sealant if it is still tacky. Press the trim firmly so it sits flush against the wall. You may need to re-caulk the seam between the trim and wall with interior caulk if there are gaps.

Test the window by spraying water around the outside edge with a hose while someone watches from inside for drips. Start with a light spray and increase pressure gradually. If you see water coming in, the sealant did not seal properly — let it cure longer, or explore a second bead of sealant to the problem area. Once it passes the water test, you are done.

When to hire a professional instead of replacing it yourself

If the wall around the window is soft, cracked, or water-damaged, hire a technician. If the window is a custom shape or size that does not match standard RV dimensions, a professional can measure and order the correct replacement. If you do not have a caulk gun or marine-grade sealant, or if you are uncomfortable working at height on a ladder, hiring someone is safer and faster.

Professional replacement typically costs $400 to $800 per window including parts and labor. RV service centers, mobile RV repair services, and some glass shops offer this work. Get a quote that specifies the window type, material, and whether they will inspect the frame for damage. Many professionals will also warranty their sealant work for a year or more, which gives you recourse if the window leaks later.

Frequently Asked Questions

Can I replace an RV window with a standard house window?

No. RV windows are designed to flex slightly with the movement of the RV frame, and they use different mounting systems and sealants. A house window will crack or leak in an RV. Always order a replacement made for RVs.

What sealant should I use around the new window?

Use marine-grade polyurethane or silicone sealant rated for RVs, such as Dicor, Sikaflex, or Eternabond. Do not use standard caulk or silicone — it will fail in the heat and UV exposure of an RV. Check the tube to confirm it is rated for RV use and exterior exposure.

How long does it take to replace an RV window?

Two to four hours if you work alone and have the right tools. Most of that time is removing old sealant and letting new sealant cure. The actual removal and installation takes 30 to 60 minutes.

What if the new window does not fit the opening?

Measure twice before ordering. If it arrives and does not fit, contact the supplier when ready — most will exchange it if you have not installed it yet. Do not force a window that does not fit; you will crack it or damage the frame.

Do I need to remove the window to replace just the glass?

It depends on the window type. Some RV windows have removable glass panes that you can replace without removing the frame. Others are sealed units where the glass and frame come together. Check your window documentation or contact the manufacturer to find out whether yours is serviceable.