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Door lock rough estimate

Replace Door Lock Estimate

Estimate lock cost, screws, strike plate hardware, fit adjustments, tools, rough material cost, security notes, and hands-on DIY time for replacing one existing door lock or lockset.

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Create a full DIY project plan

Turn this rough estimate into a step-by-step plan with a material checklist, tool list, prep notes, shopping categories, and printable planning guidance.

Preview full project plan

Rough estimate only

This tool is for replacing one existing door lock, deadbolt, knob, lever, handle set, or smart lock using the existing door prep only. It may include a new lockset, screws, strike plate, basic shims or small hardware, lubricant, tool allowance, and cleanup supplies. It does not include cutting a new bore hole, moving the lock location, repairing a damaged door, replacing the door, repairing the frame, smart lock wiring, locksmith service, rekeying service, security upgrades, or professional labor. Real costs can change based on local prices, lock type, door type, existing hole condition, strike plate condition, door material, fit adjustment needs, tool needs, and cleanup.

Measurement system

One existing door lock or lockset

Estimate replacing one existing door lock, deadbolt, knob, lever, or handle set using the existing door prep only. This does not include cutting a new bore hole, moving the lock location, repairing a damaged door or frame, locksmith service, rekeying service, security upgrades, or professional labor.

This assumes the new lock fits the existing door holes, latch bore, strike location, and door thickness.

Project planning note

Review the selected options, site condition, material assumptions, and tool needs before buying supplies. This calculator is meant for rough DIY planning, not a professional quote.

Fit/security note

This estimate assumes the new lock fits the existing door prep. Check backset, bore size, latch faceplate, door thickness, strike alignment, and keying needs before buying. Smart locks may also need app setup and batteries.

Recommended materials/tools

  • Knob plus deadbolt set allowance
  • Basic extra keys
  • Screws, strike plate screws, lubricant, small hardware, and cleanup supplies
  • Existing door prep assumed usable
  • Basic hand tool allowance included

Basic DIY checklist

  • Confirm the new lock matches the existing door prep, backset, door thickness, and handing before buying.
  • Remove the existing knob, lever, deadbolt, or handle set and keep screws organized.
  • Install the latch or bolt first, then install exterior and interior lock pieces.
  • Tighten screws evenly and avoid overtightening until the latch or bolt moves smoothly.
  • Check that the latch or deadbolt enters the strike plate cleanly without forcing the door.
  • Test locking and unlocking from both sides before closing the door fully.

When to call a pro

  • Call a pro if the lock binds, the latch does not line up, or the door does not close securely after adjustment.
  • Call a locksmith or door pro for new bore holes, moved lock locations, damaged doors, frame repair, security upgrades, or rekeying service.

This is a rough DIY planning estimate for replacing one existing lock using existing door prep only. It does not include new bore holes, moved lock locations, damaged door or frame repair, smart lock wiring, locksmith service, rekeying service, security upgrades, or professional labor.

Rough estimate

$108 - $415

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Saved project beta

Save this estimate

Save this rough estimate to a DIY project area so you can come back to it later.

We will also email the saved project link. Keep the link shown after saving as a backup.

DIY planning notes

Replace Door Lock planning guide

Use this quick guide with your rough estimate to think through fixtures, fans, locks, rods, racks, holders, shelves, organizers, bathroom and kitchen hardware, door and window items, and quick home installs and whether this is a good DIY project for you.

What affects this estimate

  • Project size and measured area
  • Existing condition and prep needs
  • Material quality and product choices
  • Removal, access, or cleanup needs

Basic materials/tools

Materials

  • • Selected fixture, device, lock, detector, or weatherstrip
  • • Mounting hardware, connectors, batteries, or small parts
  • • Cleanup and testing supplies

Tools

  • • Screwdrivers
  • • Drill or driver
  • • Tester, ladder, or basic hand tools

Before you start

  1. 1Turn off power or water when the project requires it.
  2. 2Verify compatibility with the existing box, wiring, valve, door prep, or mounting surface.
  3. 3Test the finished install carefully before regular use.

Watch out for

  • Working without shutting off power or water when needed.
  • Assuming old wiring, valves, hardware, or mounting boxes are reusable.
  • Forcing parts that do not fit the existing setup.

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