Mortise Locksmith Service for High-Security Doors

A mortise lock is a rectangular lock case set into a pocket, or mortise, cut into the door edge, rather than dropped into two round holes bored straight through like a standard deadbolt. A mortise locksmith installs, repairs, rekeys, and replaces these lock sets on older solid-wood doors and modern commercial entries alike. If yours sticks, rattles, or won't retract cleanly, a licensed locksmith can usually diagnose and fix it on the same visit.

Call a licensed local pro now for a fast quote.

What a Mortise Lock Is and How It Differs From a Cylindrical Lock

The case is a solid metal box holding the latch, deadbolt, and often the lever mechanism in one unit. A cylindrical, or bored, lock instead uses two round holes, one through the face and one through the edge, joined by a thin connecting bar. The mortise case runs through more of the door's thickness, so it resists prying better, which is why it shows up on solid-core residential doors and heavy-use commercial entries.

Mortise lock work is one of the more specialized calls a locksmith service handles. Chiseling a new pocket, or matching the exact backset of an existing case, takes more precision than boring a standard deadbolt hole.

How to Tell If Your Door Has a Mortise Lock

• The faceplate on the door edge is a long rectangle, roughly 1 by 6 to 8 inches, not a small round one.
• The door is solid-core or commercial-grade, often 1 and 3/4 inches thick or more.
• One lever or knob operates the latch and deadbolt together through a single mechanism.
• The building predates the 1960s, or it's an older commercial storefront. Both commonly shipped with mortise hardware.
• If you're not sure, send a locksmith a photo of the door edge faceplate; most can confirm the lock type by phone.

Signs You Need a Mortise Locksmith

• The latch or bolt doesn't fully retract when you turn the lever or key.
• The door won't close flush, or you have to lift or shove it to get the latch to catch.
• The escutcheon plate around the knob or lever is loose or rattling.
• The key turns but nothing happens inside the case, usually a broken spring or worn tumbler.
• You want to convert an old mortise-prepped door to cylindrical hardware, or the reverse.
• Several doors at a business need to operate on one master key.

Mortise Locksmith Services and What Drives the Cost

Pricing swings on job type, door material, lock grade, and whether the mortise pocket can be reused. Here's how the jobs compare:

Service	What's Involved	Relative Cost	Typical Timeframe
Rekey	Swap the pins or wafers inside the existing cylinder	Lowest	15 to 30 minutes
Repair	Replace a worn spring, latch, or cylinder inside the existing case	Low to mid	30 to 60 minutes
Full case replacement	Swap the mortise lock body, reuse the original pocket	Mid	1 to 2 hours
New install or conversion	Cut a fresh mortise pocket, or convert cylindrical prep to mortise (or the reverse)	Mid to high	2 to 4 hours
Commercial master key system	Key several mortise locksets to one master, set the keying schedule	High	Scales with door count
Antique or historic restoration	Source or hand-fit parts for a discontinued case	Highest	Often more than one visit

Cost also moves with door hardness (hardwood versus hollow-core), lock grade, and whether parts must be special-ordered for an older case. A high security locksmith for master key systems keying several mortise locksets to one schedule should scale the estimate with door count, not a flat per-lock rate. If you're weighing a mortise upgrade against simpler hardware, compare pricing across locksmith services or check how a standard deadbolt installation is priced.

DIY vs. Professional Mortise Lock Work

Swapping a worn lever on a modern lockset is realistic to do yourself if the replacement matches the existing backset and function exactly. Call a locksmith when:

• The door doesn't latch correctly even after checking the strike plate alignment.
• You need a new mortise pocket cut, or aren't sure the door prep matches a standard size.
• The case is from a brand no longer in production and parts aren't sold at hardware stores.
• You're rekeying or master-keying more than one or two doors.
• The door is antique or part of a historic property, where the wrong fix can damage trim that's hard to replace.

A mismatched backset isn't cosmetic. If the new case doesn't match the pocket dimensions, it won't seat, and forcing it usually means recutting the mortise from scratch.

Mortise Locks in Commercial and Historic Buildings

Multi-tenant buildings, storefronts, and pre-war homes lean on mortise hardware because it handles heavy daily use and lets a property standardize dozens of doors on one master key. The same technician typically covers general door lock repair and broken key extraction on any bored hardware in the same building, so one call handles both. Discontinued cases sometimes need parts sourced from a salvage supplier, or hand-fit to the existing pocket.

FAQ

What is a mortise lock?

A rectangular lock case set into a pocket cut into the door edge, holding the latch, deadbolt, and often the lever mechanism in one unit, unlike a cylindrical lock's two bored holes.

Are mortise locks more secure than cylindrical locks?

Generally yes, since one case anchors latch and bolt through more of the door's thickness. Actual security still depends on the lock grade, strike plate, and door itself.

Can I install a mortise lock myself?

Swapping a lever on an existing case with a matching backset is doable. Cutting a new pocket or matching an obsolete case's dimensions is a job for a locksmith, since wrong measurements mean the case won't seat.

How much does it cost to install or repair a mortise lock?

It depends on the job type, door material, and lock grade. Rekeying runs lowest; cutting a new pocket or restoring an antique case runs highest. Confirm the quote before work starts.

Do locksmiths repair mortise locks, or only replace them?

Most issues get repaired inside the existing case. Full replacement makes sense when the case is cracked, the grade is outdated, or parts for a discontinued model aren't available.

Can an antique or historic mortise lock be repaired instead of replaced?

Often. Many antique cases can be cleaned, re-sprung, and rekeyed rather than removed. When parts are missing, a locksmith can source a period-correct case or hand-fit a modern one to the pocket.

---

Stuck lever, loose escutcheon, or a mortise lock that won't retract: call a licensed local pro now for a fast quote, and ask whether the fix is a same-visit repair or a full case replacement. A pro who offers full residential locksmith services for your home can cover rekeying and deadbolts in the same visit.