Doors & Windows
Doors that latch, windows that seal.
Doors & Windows proves you can diagnose why a door binds or a window leaks, and correct it — hinge and strike adjustment, slab and prehung replacement, hardware, screens, and weather sealing. Everything below is free — no login, no paywall. Work through the skill areas, drill them in Study Mode, and when you're ready, prove it with the certification exam.
Your readiness to certify
Drill all 0 concepts in Study Mode. Mark each one “Got it” once you know it cold. When every concept is cleared, you're ready for the DWN exam.
What you'll be able to do
- Door anatomy: slab, prehung, jamb, casing, and swing direction
- Diagnosing sticking, dragging, and doors that swing open on their own
- Hinge shimming, strike plate adjustment, and latch alignment
- Slab replacement: mortising hinges and boring for hardware
- Prehung door installation, plumb, level, and shimming
- Lockset, deadbolt, and smart-lock installation
- Interior door types: bifold, bypass, pocket, and barn door hardware
- Storm doors, thresholds, and door sweeps
- Window types, sash repair, balance replacement, and screen rebuilding
- Weatherstripping, caulking, and stopping air and water infiltration
Skill areas
Jump to any area — each lesson teaches the system from the ground up, then recaps the key takeaways you'll drill in Study Mode.
Studied the material? Get DWN certified.
The Doors & Windows exam turns what you just learned into a verifiable credential drivers and shops can look up. 45 questions · 60 minutes · 75% to pass · $19.99.
Studying here is free forever. There's no obligation to take the exam.
Real-world cost guides for this system.
See what customers pay for the jobs this track teaches — parts, labor hours, and state-by-state ranges from our repair cost estimator.