Universal Door Latch Fitting and Adjustment Kit for Homeowners

Published on 06/15/2025Product Idea Validation (Non-SaaS)

The user is dealing with a pesky issue: a door latch that sticks out, making it hard to close the door properly. This usually happens because the backset size is off or, more often, the mortise for the latch plate isn't the right size. While you can find replacement latches, getting the right size or modifying the door can be a real headache for DIYers.

Product Opportunity: Universal Door Latch Fitting Kit

Product Description: This kit would help both renters and homeowners fix misaligned door latches without needing advanced carpentry skills or multiple trips to the hardware store. It’s not about replacing the entire latch mechanism but rather adjusting the fit of an existing or new latch.

The kit would include:

  1. Mortise Adjustment Tool: A specialized, easy-to-use hand tool (like a guided mini-chisel, a specialized scraper, or a compact routing guide) designed to cleanly and precisely deepen the mortise (the recess in the door edge) for a protruding latch. This is the key component for solving the user's specific problem.
  2. Stackable Shims: A set of thin, durable shims (plastic or metal) of varying thicknesses. These can be placed behind the latch plate to correct for a latch that is too recessed, bringing it flush with the door edge.
  3. Backset & Latch Plate Measuring Gauge: A simple, multi-function tool to help users accurately measure the door's backset (distance from door edge to the center of the doorknob hole) and the dimensions of the latch plate. This helps diagnose whether the issue is the mortise depth/size or if a different sized latch is needed.
  4. Clear, Illustrated Instructions/QR Code to Video Guides: Step-by-step guidance for diagnosing common latch fitment issues and using the kit's components for both protruding and recessed latches.

Benefits:

  • Solves a common and frustrating household problem.
  • More cost-effective and less wasteful than replacing an entire functional latch.
  • Empowers DIYers, including renters who may be hesitant to make major modifications.
  • Provides a precise and cleaner solution than common "hack" fixes.
  • Reduces trips to the hardware store by providing a comprehensive fitting solution.

Target Market:

  • Homeowners
  • Renters
  • DIY enthusiasts
  • Handymen

Expected Revenue: $20-$30 per kit. This price point makes it an affordable solution compared to the cost of a new quality latch assembly or hiring a professional.

Origin Reddit Post

r/diy

Door latch assembly extends beyond the doors edge

Posted by u/Aristrudel06/15/2025
Hey all! We just started renting this home and I’ve come to realize my bedroom door latch assembly protrudes beyond the edge of the door itself. As a result of this, the door gets a bit stuc

Top Comments

u/jeff24141
You need to change the backseat in the latch
u/EnoughDog6492
Try using an approximately 3/4 or 7/8 12 point deep well socket to tap it back in place.

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