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Crenshaw Lock

Deadbolt Installation in Monrovia · 24/7 mobile

Deadbolt Installation in Monrovia, California

Crenshaw Lock Company installs and replaces single- and double-cylinder deadbolts in Monrovia, California, 24/7, and we come to you in a fully mobile service. Whether it's an Old Town Craftsman or a hillside home, call (323) 997-8867 to talk through your door and get a stronger lock fitted.

  • Mobile to your Monrovia location
  • Available 24/7
  • Price quoted before we start
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Deadbolt bolt extended into a reinforced strike plate
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A deadbolt is the single most useful upgrade you can make to an exterior door, but only if it is fitted properly. In Monrovia, that is rarely a simple swap. The city has a deep stock of 1900s to 1930s Craftsman bungalows and Victorians, many with original mortise and rim hardware, doors that have been painted and re-hung many times, and frames that have settled with age. A deadbolt that would drop into a modern prehung door in minutes can need careful, hand-fitted work on a century-old one.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar has spent decades working on exactly this kind of mixed-age housing. We are fully mobile, so there is no storefront to visit. We bring the hardware and tools to your door, whether that is a bungalow near Library Park, a hillside house above Foothill Boulevard, or a shop on Myrtle Avenue.

This page explains how a deadbolt installation works, what changes the cost, how to choose between single- and double-cylinder, and what is specific to doing it in Monrovia. If you would rather talk it through, call (323) 997-8867 any time, day or night.

How it works in Monrovia

  1. 1

    Look at the door and the goal

    We start by understanding what you want: a first deadbolt on a door that only has a knob latch, a replacement for a worn or failing bolt, or a stronger lock after a move or a break-in attempt. We check the door material, thickness, condition, and whether it is original to the house.

  2. 2

    Choose single or double cylinder

    A single-cylinder deadbolt turns with a key outside and a thumbturn inside, which is easiest and safest in an emergency. A double-cylinder needs a key on both sides and is sometimes considered for doors with glass nearby. We explain the tradeoffs, including egress and fire-safety concerns, so you can decide with the facts in hand.

  3. 3

    Prepare the door carefully

    If the door already has bored holes, we work with them. If not, we mark and drill the face and edge bores cleanly with proper guides. On older or vintage wood doors we take extra care to avoid splitting, and where possible we avoid unnecessary damage to period character.

  4. 4

    Install and align the bolt and strike

    We fit the deadbolt, then set the strike plate in the frame. On settled Craftsman frames, the bolt and strike often need fine adjustment so the bolt throws smoothly and fully. We recommend longer strike screws that reach the framing stud, which makes a real difference when someone leans on the door.

  5. 5

    Test, key, and walk you through it

    We operate the lock many times with the door open and closed, confirm it throws smoothly, and hand over keys. If you want several locks keyed alike, such as a front door, a side door, and a gate lock, we can discuss that at the same visit.

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What affects the price

  • Whether the door is already bored for a deadbolt or needs new holes drilled, which changes the amount of labor involved.
  • The grade and brand of the deadbolt you choose, from standard residential hardware up to higher-security options with pick- and drill-resistant features.
  • Door material and age, since solid wood vintage doors and metal or fiberglass doors each call for different techniques.
  • Single- versus double-cylinder, and how many locks you want installed or keyed alike in one visit.
  • Any frame or strike reinforcement needed, such as repairing a worn jamb or adding a stronger plate.
  • Time of day, since after-hours and weekend calls differ from scheduled daytime work.

Why Monrovia chooses us

  • Fully mobile service: we come to your Monrovia door with hardware on hand, and there is no shop to drive to.
  • Available 24/7, including evenings and weekends when a door has been compromised and cannot wait.
  • Experience with older homes: Craftsman bungalows and Victorians with original mortise and rim hardware are familiar territory, and we try to keep period doors intact.
  • In business since 1987 under owner and lead tech David Shar, so the person guiding your job has seen a lot of doors.
  • Honest recommendations: if your existing lock can simply be rekeyed or the frame is the real weak point, we will say so rather than sell you more than you need.

Deadbolt Installation across Monrovia

Monrovia's housing varies enough that no two deadbolt jobs are quite alike. In and around Old Town Monrovia, in ZIP code 91016, many homes date from the early 1900s through the 1930s. Their solid wood doors, deep frames, and original hardware often call for hand-fitted work. Mayflower Village, with its own mix of older homes and neighborhood streets, presents similar questions about adding security without spoiling the look of the door.

North of Foothill Boulevard, the city climbs toward Monrovia Canyon Park, and North Monrovia in the foothills brings hillside custom and mid-century homes, many in ZIP code 91016 and 91017. Larger lots there often have long driveways and side-yard gates, so a deadbolt upgrade at the front door can be paired with attention to gate locks and secondary entries. Homeowners who have just bought a house often ask us to install new deadbolts and rekey everything at the same visit.

Downtown, Myrtle Avenue's Old Town strip is a walkable mix of small shops and restaurants with locks of many ages, and business owners sometimes want a stronger deadbolt on a back or side door. We reach customers across the city from I-210, Huntington Drive, Mountain Avenue, and Foothill Boulevard, whether you are near the Aztec Hotel, Library Park, or the Metro A Line station.

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Other Monrovia locksmith services

See all of our Monrovia services, or our citywide deadbolt installation page.

Deadbolt Installation in Monrovia — FAQs

Can you install a deadbolt on an old Craftsman door in Monrovia?
Usually yes. Older solid wood doors take careful drilling and sometimes a different hardware choice, but we work to keep the door intact. Call (323) 997-8867 and describe the door, and we can talk through the options.
What is the difference between single- and double-cylinder deadbolts?
A single-cylinder uses a key outside and a thumbturn inside. A double-cylinder needs a key on both sides. Single-cylinder is easier to exit in an emergency, while double-cylinder is sometimes used near glass. We will explain the tradeoffs for your door.
Do you offer deadbolt installation at night or on weekends?
Yes. Crenshaw Lock Company is available 24/7 and fully mobile, so you can call (323) 997-8867 at any hour, including weekends and holidays.
Can I get a new deadbolt keyed to match my other locks?
In many cases, yes. We can key a new deadbolt to match compatible existing locks or key several new ones alike, so a front door, side door, and gate lock can share one key.
Will a deadbolt installation damage my door?
A properly done installation should not. If the door is already bored, we use the existing holes where possible. On vintage doors we take extra care, and we will tell you in advance if there is a risk.
I just bought a house near Foothill Boulevard. Should I replace the locks?
It is a good idea. You do not know who has keys to the previous owner's locks. We can replace deadbolts or rekey existing ones, and also handle gate and side-yard locks on larger lots.
Do you install deadbolts for businesses on Myrtle Avenue?
Yes. We handle commercial doors as well, including back and side entrances for shops and restaurants. Call (323) 997-8867 to discuss your door and your needs.
Do I need to come to your shop?
No. We are fully mobile with no storefront. We come to your home or business in Monrovia with the hardware and tools needed.
DS

Reviewed by David Shar — Owner & Lead Technician

Crenshaw Lock Company has served Greater Los Angeles & Ventura County since 1987.

Last updated 2026-10-12.

Call (323) 997-8867 · Open 24/7