In addition to beefing up your home’s physical defenses, following some good-security rules will help deter thieves.

Keep Valuables Out of Sight

Place articles of ostensible value out of the view of anyone at your front door or easy-to-see-into windows. Stash cash and expensive jewelry in unlikely places—for example, in a large envelope or among many paper files. Select containers no one will accidentally discard.

Make Them Think Someone Is Home

Most burglars strike when no one is home, so make sure your house appears occupied. Leave music or a TV on, and keep your garage door closed. Plug a light or two into timers or use a smart-home hub to turn them on at dusk and off at bedtime.

When You’re on Vacation, Keep Up Appearances

So that mail and packages don’t pile up, place a mail hold at the post office, or ask a friend or neighbor to collect them. Arrange for your lawn to be mowed or your sidewalk shoveled, if needed. Leave a car parked in the driveway.

Keep Track of Keys

Intruders also invade homes with keys “hidden” under your doormat, kept by a contractor, or copied from a key lent to a plumber or parking-lot attendant, or…you get the idea.

When you move into a house or apartment, consider having all the lock cylinders replaced or re-keyed.

If you often need to provide access to anyone you don’t fully trust, consider installing an electronic lock on one or more doors, which will allow you to easily change entry codes.

Secure Tools

Crowbars, hand tools, or yard tools lying outside the house or in open garages invite trouble. Lock up any implements that could be used for prying or bashing, and secure ladders.

Work with Your Neighbors

Neighborhood watch groups can cover a single block of 10 or 12 houses or dozens of blocks with 1,000 houses. Most get training from police officers on security measures, ways to spot suspicious activity, and how to keep in contact with the police. Some neighborhoods even form citizen patrols of volunteers who look for suspicious activity that they report to the police.

Get Insurance

Maintain adequate homeowners or renters insurance to cover property losses due to burglaries; our section on homeowners insurance will help you find the best companies. Certain items (jewelry, cash, electronics and computers, and guns) usually are covered at low limits; consider buying extra coverage for them.

Insurance companies typically offer the option of covering the full replacement cost (with no deduction for depreciation) for 10 to 20 percent more than the standard policy. If burglars clean out your home, coverage for full replacement cost could save you thousands. Without a replacement cost provision, homeowners insurance policies cover only the “market value” of personal property, not “replacement value.” Market value is defined as the replacement cost minus depreciation.

Take an Inventory

Making a list of your belongings will help you get compensated if you suffer a major loss from burglary or fire. List expensive possessions, including purchase dates and prices; then move through your home and record a video of the rest. Update your inventory every few years.

If you own antiques, expensive jewelry, original paintings, or other items of substantial value, get written appraisals—but make sure your appraiser is acceptable to your insurance company. Tell the appraiser that you want the evaluation for insurance purposes. Many are dealers, and if they think you want to sell the items, they might lowball the estimates.

Participate in Operation Identification

This involves engraving an ID number on your valuables and putting a decal in your window. This will deter some burglars because clearly marked items are harder to sell. Although only about 10 percent of burglarized homes recover any stolen stuff, positive identification improves your chances.

There are also various ways to “fingerprint” fine art, jewelry, and other items without damaging them. Ask an appraiser or jeweler for help.

Lock Up Guns

Burglaries are major sources of guns for criminals, although estimates of the percentage of crimes involving stolen guns vary widely. Each year more than 200,000 guns are stolen, but no one knows how many more gun thefts are unreported (some studies estimate over 60 percent). Trigger locks can prevent accidental shootings but not thefts. If you have guns, store them in locked gun boxes or racks that cannot be easily removed. Another option is a Simplex lock, a small gun safe ($150 and up) opened by pressing five buttons in a specific order.

Get a Watchdog…

Dogs can offer added security in multiple ways. First and least is the family pet with no particular training in sounding an alert. Performance varies tremendously, depending on its breed and genealogy, gender, individual idiosyncrasies, and life experiences. Dobermans and German shepherds get a lot of respect from intruders. A concern, of course, is that your untrained dog will attack innocent strangers, your neighbors, or their children.

The second level is to train your dog to bark at—but not attack—strangers. This usually requires hiring a professional trainer.

The third level is a personal protection dog professionally trained to attack on command or when he or she thinks a family member is being assaulted. Unfortunately, even most watchdogs have trouble distinguishing between a friendly slap on the back and a real assault. Many are unreliable except when handled by their family.

…Or Bluff That Your Dog Is a Menace

You can post a “Beware of Dog” sign at the front entrance of your house—even if you have no dog or the dog you do have is afraid of strangers, loud noises, all creatures large and small, the wind, and pretty much any moving object.

Install a Safe or Rent a Deposit Box at Your Bank

Small fire-resistant home safe models with about one cubic foot of storage cost $100 to $200; many models can be bolted to the floor. Safecrackers can open them, but other burglars usually can’t. Highly secure—but much more expensive—safes are also available.

A safe deposit box rented at a nearby bank is less convenient but provides a level of security against theft and fire that cannot be duplicated at home for less than several thousand dollars.

Consider Getting a Lock for Your Bedroom Door

Since you spend much of your time at home in your bedroom, you may also want to install a solid-core door with a heavy lock on it. If you don’t have kids, you can then sleep with your bedroom door locked. If you have kids, sleeping behind a solid and locked door probably sounds like a fantastic arrangement for more rest, quiet, and privacy, but it’s a bad move in terms of safety. On the other hand, if you have a bedroom door that locks, you can retrieve your kids and lock out home invaders.