What Burglars Look For Front Door | Read Your Own Door Before They Do

Most burglars don't kick doors in. That's the movies. What actually happens is a slow walk past, a quick look, and a decision made in about four seconds. Your door either passes that test or it doesn't.

I spend a lot of time looking at doors across Richmond, Petersham, Ham, East Sheen, St Margarets and the rest of the TW9 and TW10 patch. After a while you stop seeing doors as doors. You see them as a list of problems, or a list of answers. What follows is that list, written from the outside looking in.

Work through it on your own property. Be honest.

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The Cylinder: The First Thing They Clock

Stand at the pavement and look at your front door lock. If the cylinder protrudes more than a few millimetres proud of the escutcheon plate, you've just told every passer-by that snapping it off is an option.

Snap attacks work by gripping the exposed end of a euro cylinder with mole grips or channel-lock pliers and shearing it. The average attack takes under a minute. The cylinder doesn't need to be cheap for this to work. Even mid-range cylinders snap if enough metal is exposed.

What to check:

• Protrusion. Press a ruler flat against the door face alongside the cylinder. If the cylinder body extends more than about 3 mm beyond the escutcheon, it's exposed. Some older installations have 5 mm to 10 mm sticking out. That's a handhold.
• Star rating. TS007 is the British standard for euro cylinders. Three stars is the target. One star is the cylinder alone. Two stars is the cylinder plus a specific anti-snap escutcheon. Three stars is a cylinder that passes the full anti-snap, anti-bump, anti-pick and anti-drill suite on its own. Brands meeting TS007 3-star include Avocet ABS, Ultion, Mul-T-Lock MT5+, and certain ERA and Yale Platinum lines. Look for the three-star mark on the end of the cylinder.
• SS312 Diamond grade. Sold Secure's Diamond rating goes further than TS007. It includes a manipulation resistance test and a more aggressive snap test. If your cylinder carries SS312 Diamond, you're in good shape.
• The letterbox test. On some older doors the letterbox sits directly opposite or below the cylinder. A bent wire through the letterbox can sometimes reach the thumb-turn on a non-deadlock cylinder. Check the line of sight from your letterbox to the lock. If there's a clear path, fit a letterbox guard or a letter cage on the inside.

Replacing a cylinder that fails these checks costs roughly £60 to £120 fitted, depending on whether you choose a TS007 3-star or go to SS312 Diamond. It's one of the cheapest meaningful security upgrades on the list.

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The Lock Itself: Deadlock or Not?

A cylinder alone doesn't tell you what mechanism it operates. On a uPVC door, it typically drives a multipoint lock, which when locked properly throws hooks, bolts and rollers into the frame simultaneously. On a timber door, it might drive a single nightlatch, which is just a spring latch with no deadbolt. A nightlatch is opened with a credit card in about three seconds.

• BS3621. This is the British Standard for deadlocks and deadlocking nightlatches. Most home insurance policies require a BS3621 lock on the front door. It tests for attack resistance: drilling, picking, forcing. If your lock doesn't carry BS3621, your insurer may not pay out after a break-in.
• BS8621. The keyless-egress variant of BS3621, intended for doors where you need to exit without a key (relevant for houses with kids or older occupants). Same attack resistance, different operation.
• Multipoint lock condition. Walk back inside and lift the handle fully before turning the key. On a well-adjusted uPVC or composite door, all hooks and bolts should engage smoothly and the door should have no play when locked. If the door bows, rattles, or the key feels stiff, the multipoint lock is misaligned. A misaligned multipoint lock is sometimes easier to bypass than a single-point BS3621 deadlock in good condition.

On timber doors in older Richmond Hill and Petersham properties, I regularly find a Yale-type spring latch as the only lock. Sometimes it's the original 1970s fitting. That's a problem. Add a BS3621 mortice deadlock at least 150 mm below or above the latch.

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The Door Frame: The Part Nobody Checks

Kick-ins on solid doors are rare. Kick-ins on the frame the door is hung in are common. The door survives. The frame splinters at the keep or the striker plate.

Stand close to your door and look at the frame where the lock engages:

• Striker plate depth. A standard builder-fit striker plate is held in by two or four 25 mm screws into softwood. They pull out. The fix is a London bar or a 300 mm anti-jemmy plate (sometimes called a door reinforcer) fixed with 75 mm screws that reach the structural frame behind the casing. Mila, Endurance and Brisant all make suitable reinforcers. Cost is typically £15 to £35 for the plate, plus fitting time.
• Hinge side. Hinges fail under attack too. If your door opens outward and the hinge bolts are exposed, check whether the door has hinge bolts on the non-hinge side. If the door opens inward, the hinges are inside but the hinge side of the frame still needs to be structurally sound. Look for rot at the base of the hinge side on older timber frames. Soft wood there means the screws are in nothing.
• The gap at the bottom. A gap of more than about 4 mm between door and frame at the bottom can allow a flat bar to be inserted and levered. Composite doors tend to be better here than old timber ones.

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What the Approach Tells Them

Before they reach the door, they've already read the property. Here's what they're actually looking at.

Lighting

A dark porch is a gift. No passing neighbour is going to notice someone crouching at an unlit door at 10 pm in November. Half the roads off Richmond Road and around North Sheen have deep Victorian or Edwardian porches that swallow available street light.

• Fit a PIR light over the door that triggers from the pavement approach, not just from two feet away.
• Minimum 800 lumens. Enough to illuminate the face, not just the step.
• Check the PIR angle covers the gate or path approach, not just directly in front of the door.

The Side Gate

Burglars prefer rear entry. Quieter. Less observed. The front door is often the decoy check: they look at it to assess overall security, then go round the back.

If your side gate is visible from the front, it's part of the first pass. An unlocked or low gate, a gate with a simple bolt visible at the top, or a gate with wheelie bins immediately beside it, all tell the same story: easy access to the rear.

• Bins next to a gate or fence are steps. Move them or lock them away.
• A gate padlock should be rated to at least Sold Secure Gold, ideally SS312 Diamond. Cheap padlocks are opened with bolt croppers in one move. See the Sold Secure website for rated products.
• If the gate height is under 1.8 m and there's no trellis or anti-climb measure on top, the padlock is mostly decorative.

Bin and Recycling Clutter

We're all used to seeing Richmond Borough Council's green and brown bins on the pavement on collection day. What you don't want is those bins parked beside the property between collections in a position where they form a step over a wall or fence. This is specifically a problem on corner plots in streets like the ones off Sheen Road, where a side boundary is lower.

After collection day, put the bins back inside the boundary, not against it.

Visible Valuables Through the Hallway

A glazed front door or sidelights are common on Richmond semis and terraces. On a bright day you can see straight through into the hallway from the pavement: car keys on a hook, a laptop bag, a bicycle. Keys hanging near the door are particularly useful to a burglar because even a poor-quality letterbox on an older door can allow a hook-and-line retrieval of keys from the inside.

• Move the key hooks. Somewhere not visible and not reachable through the letterbox.
• A key safe bolted to the outside wall is not the answer for your main house keys. They're for coded access by specific people (carers, family). Not a general key storage solution.
• Frosted or obscured glass for sidelights is easy to retrofit with adhesive privacy film. It's cheap and it changes what's visible from outside completely.

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The Door Material: A Quick Read

The type of door sends a signal too.

Composite doors vary enormously. A budget composite on a new-build in a TW10 estate is not the same as a tested PAS24 composite. PAS24 is the standard that tests the whole doorset, not just the lock. It covers the frame, the hinges, the glazing and the lock together. If your door claims PAS24, it should have documentation. If it doesn't, the claim is unverified.

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The Spy Check: Stand Outside and Actually Look

Most homeowners never do this. Go outside at night, stand where a passing pedestrian would stand, and look at your front door for thirty seconds.

What you're asking:

• Can you see the cylinder protrudes?
• Is there a light? Does it trigger before you reach the door?
• Is the letterbox a decent-sized rectangle with no visible lock or thumb-turn behind it?
• Is the side gate visible? Is it obviously easy to get over?
• Can you see anything worth taking through the glazing?
• Is there anything to stand on that isn't supposed to be there?

Then ask one more question: does this door look like it takes thirty seconds to get past, or five minutes? Most opportunist burglars won't spend five minutes on a front approach. They'll move to the next one.

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The Letterbox: Small Opening, Real Vulnerability

Standard letterboxes are 250 mm wide by 38 mm tall, roughly, but cheaper plates can be larger and floppier. Vulnerabilities:

• Hook-and-line attacks to retrieve keys, as above.
• Hand entry on oversize letterboxes with no internal cage. A child-sized hand can reach quite far into an older plate.
• Vision into the hallway. Relevant for assessing occupancy. A house with post visibly piling up behind the door reads as unoccupied.

Fix: a British Standard letterbox (BS EN 13724) with an internal cage or anti-fishing baffle. Screwfix and most locksmiths carry them. A full replacement plate with an integrated brush seal and anti-fish cage costs under £20. It takes about twenty minutes to swap out.

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What Good Looks Like

For a standard Richmond semi or terraced house, a front door that a burglar is likely to skip:

• TS007 3-star or SS312 Diamond cylinder, fitted flush or recessed
• BS3621 mortice deadlock (timber doors) or confirmed PAS24 composite doorset with good-quality multipoint
• 300 mm reinforced striker plate with 75 mm fixings
• No protrusion, no exposed cylinder end
• BS EN 13724 letterbox with anti-fish cage, keys not visible or accessible
• PIR light triggering from 3 m to 4 m away, 800+ lumens
• Side gate padlocked to at least Sold Secure Gold, bins not adjacent
• No obvious valuables visible through glazing

None of this is exotic. Most of it costs under £200 if you start from scratch. The cylinder alone is often the single fix that moves a door from the easy column to the too-much-effort column.

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If you work through these checks and find a cylinder that protrudes, a frame that flexes, or a multipoint that's misaligned, Rapid Response Locksmiths covers Richmond and the full TW postcode area. Average arrival under 30 minutes for most jobs in TW9 and TW10. Pricing is given honestly on the call, before we come out. No obligation to proceed.