How to Replace a Camper Window | Step-By-Step Window Swap

To replace a camper window, remove the interior trim ring, push out the old window, clean the opening, and install the new unit with bulb seal tape.

A fogged, cracked, or leaking camper window is a common repair. Standard clamp-in RV windows — sliding, egress, or fixed — all follow the same swap process. With a helper, basic hand tools, and a replacement window sized to your rough opening, the job runs about two hours plus overnight cure time for the cap seal.

Measuring and Preparing the Window Opening

The most critical measurement is the rough opening — the hole in the wall, not the old window. Measure height and width at the interior frame edge, then check wall thickness from inside to outside.

The new window’s flange must overlap the opening by at least 3/8 inch. If uneven, use shims to center it. For replacement options, our roundup of the best camper door window options covers sizes, pane types, and pricing.

Removing and Installing the Camper Window

Start by removing the interior valance, blinds, or shades. Unscrew the interior trim ring from the inside, working from the bottom up. Remove the screen, slide the window open for a handhold, and prepare to release the old unit.

Removing the Old Window

For clamp-in windows, run a thin putty knife around the exterior to break the sealant bond, then push the old window out from inside. For bonded windows, insert a hook tool at the bottom right corner, thread braided steel wire through the adhesive, attach T-handle grips, and saw through the adhesive along the bottom, top, and sides. Once free, clean every trace of residual sealant from the exterior wall flange using a razor blade or plastic scraper — a clean surface is the difference between a seal that holds and one that leaks.

Installing the New Window

Dry fit the new window without seal tape first. Confirm the flange overlaps by 3/8 inch or more and that the window sits level. Remove the window and lay it face down on a soft surface. Apply bulb seal tape around the entire flange, starting at the bottom center and overlapping the ends by ½ inch. Trim the overlap flush — a gap here is a leak path.

Insert the window from outside while a second person aligns the interior trim ring from inside. Fasten the trim ring screws at the four corners first, then gradually tighten the rest. Use only the screws provided; longer screws can crack the frame or damage the wall. Install the screen by inserting it into the top track, pushing up, and pivoting it into place. Per Lippert’s RV window installation guide, using the correct screws and overlapping the seal tape ends properly are critical for a watertight result.

Let it cure overnight before reinstalling interior coverings or driving the camper — moving the RV before the seal cures can break the bond and cause leaks.

Common Camper Window Mistakes to Avoid

Measuring the old window instead of the rough opening guarantees a poor fit. Using screws longer than provided can crack the frame or punch through the wall. Skipping the dry fit leads to misalignment that sealant cannot correct. Never push directly on the glass during removal or installation — always apply pressure to the frame. For bonded windows, failing to position drain holes at the bottom traps water inside the wall cavity.

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