DIY Window Frame Replacement — Step-by-Step for Beginners (No Pro Needed!)

Replace your old or rotten window frame with this clear, step-by-step DIY guide. I walk you through tools, demoing the old frame out, prepping the opening, installing a new frame, flashing & insulation, and finishing trim — no pro experience needed. Follow along and save on replacement costs!

🔧 Tools & Materials (quick): pry bar, reciprocating saw, drill + bits, level, tape measure, shims, exterior screws, construction adhesive, flashing tape, low-expansion spray foam or backer rod, exterior caulk, replacement window/frame or jamb kit, safety glasses & gloves.

Timestamps
0:00 — Intro & what we’re replacing
0:40 — Tools & safety
1:20 — Remove old window & frame (demo)
3:50 — Clean & prep opening (rot repair)
5:30 — Fit new frame / test fit
7:15 — Fastening, shims & leveling
9:00 — Flashing & waterproofing
10:30 — Insulation & sealing
11:30 — Trim, finish & caulk
12:30 — Final reveal + maintenance tips

What you’ll learn
• How to remove an old/rotten window frame safely
• How to check/repair the rough opening and flashing
• Best ways to level, shim, and secure a new frame
• Weatherproofing and finishing that prevents future rot

Pro tips
• Always measure twice before buying the replacement frame.
• Keep shims only at screw locations — over-shimming causes distortion.
• Flashing tape + properly tucked house wrap beats caulk alone.

Common mistakes to avoid
• Ignoring rot under the sill (replace it).
• Over-torquing fasteners and warping the frame.
• Skipping a final water test.

Like this video? Hit 👍, SUBSCRIBE and ring the bell for more DIY home repair videos.
Got questions or a tricky window? Drop a comment — I reply.