Surry Hills Locksmith

Some of the best front doors in Sydney are in Surry Hills, Paddington and Darlinghurst. Solid timber, panelled, often with a fanlight overhead and original brass or iron hardware, many have been opening and closing for well over a century.

They were not designed for modern security. Many still rely on a single old rim lock or a nightlatch fitted decades ago. Bringing them up to a sensible standard without damaging them is careful work, because a hole cut in the wrong place in a period door cannot be undone.

This guide explains how heritage doors are built, what locks suit them, when to repair rather than replace, and how to add security while keeping the door intact.

How period doors are built

Understanding the construction helps explain why lock placement matters so much.

Most Victorian and Edwardian terrace doors are framed and panelled. A frame of thick vertical pieces (stiles) and horizontal pieces (rails) holds thinner panels. The stiles and rails are joined with mortise and tenon joints, often glued and wedged.

That construction has consequences for locks:

The lock stile, the vertical piece on the handle side, is where locks go. It is usually solid and strong, but its width varies.
The joints where rails meet the lock stile are weak points. Cutting a lock into a joint can loosen it and eventually split the door.
The panels are thin. A lock should never be fixed into a panel.
Glass panels and fanlights are common, and a lock near glass may be reachable from outside if the glass is broken.

A good heritage locksmith looks at the door before choosing a lock, not the other way around.

Common original hardware

Period terrace doors often carry one or more of these.

Rim locks

A rim lock is a box lock mounted on the inside face of the door, with a matching keeper on the frame. Many old rim locks are large, attractive and still work. Their security is usually limited by today's standards.

Mortice locks

A mortice lock sits inside a pocket cut into the edge of the door. Many terraces have old mortice locks with large keys. Some are very well made. Others are worn after decades of use.

Nightlatches

Many terraces had a nightlatch fitted at some point in the twentieth century. It locks automatically when the door closes. It is convenient, but on its own it is often the weakest point on the house.

Repair first

With heritage doors, our first question is always whether the existing hardware can be kept.

Old locks often stop working well for reasons that have nothing to do with the lock itself:

The door has dropped. Old hinges wear and timber settles, so the bolt no longer meets the keeper cleanly.
The timber has moved. Doors swell in wet weather and shrink in dry weather.
The lock needs servicing. Old grease and dust build up inside, and springs weaken.

Adjusting the hinges, easing the door, cleaning the lock and replacing worn springs can bring an original lock back into good working order. It keeps the door looking right and usually costs less than replacement. See lock repair.

If an original lock cannot be repaired, it may still be worth keeping for its appearance, with a modern lock added to do the real security work.

Adding a deadlock to a heritage door

The most useful upgrade for most terrace front doors is a good deadlock alongside the existing latch. Done well, it adds real strength and can be almost invisible from the street.

Where to put it

Placement is the most important decision. A new lock should:

Sit in solid timber on the lock stile.
Stay well away from the rail joints.
Stay away from glass panels, or use a keyed inside cylinder so it cannot be opened by reaching through broken glass.
Line up with solid timber in the frame for the strike plate.

We mark the position, check it with you, and only then start cutting.

Rim or mortice?

A rim-style deadlock mounts on the inside face of the door, needs only a small hole through for the cylinder, and removes less timber. It can be a good choice for thinner or more fragile doors.
A mortice deadlock sits inside the door and is very strong, but needs a pocket cut into the edge. It suits thick, sound doors with a wide lock stile.

The right choice depends on the door. Neither is automatically better.

The strike and frame

Old terrace frames are often softer and more worn than the door. A deadlock is only as strong as the strike it locks into. Fixing the strike with long screws into the solid frame, and reinforcing it where needed, matters as much as the lock.

Finishes and appearance

Heritage doors look best when new hardware is matched to the old. Options include:

Finishes such as polished brass, aged brass, satin nickel or black, chosen to match existing hardware.
Cylinders and escutcheons that are small and discreet from the street.
Keeping original knobs and knockers even if the lock behind them changes.

Ask to see the finish before the lock is fitted. It is the part people notice every day.

Council and heritage rules

Much of Paddington, and parts of Surry Hills and Darlinghurst, are within heritage conservation areas. Some individual properties are heritage listed.

In general, changes inside the thickness of a door, such as fitting or replacing a lock, are minor. Changes to the visible street facade, such as replacing an original door, can need approval. The rules vary between councils and properties.

If you are unsure, check with the City of Sydney or Woollahra Council before making significant changes, especially if you are thinking of replacing an original door rather than upgrading its locks. A locksmith can advise on the lock work, but cannot give you planning approval.

Back doors and laneways

Many terraces back onto laneways. The back door is out of sight from the street, which makes it attractive to intruders. Back doors are often less special than the front door, so there is more freedom to fit a strong modern deadlock and a reinforced strike. If you are improving security on a terrace, the back door is often where to start.

Windows on terraces

Ground-floor front windows on terraces sit right on the footpath. Original sash windows usually have a simple catch. Keyed sash locks, fitted discreetly, make a real difference without changing how the window looks from the street. They should always let you open the window quickly from inside in an emergency.

Mistakes we see on heritage doors

These are the most common problems we are asked to fix.

A new lock cut through a rail joint, causing the door to loosen or split.
Several old holes from previous locks, leaving the lock stile weak.
Short screws into the old frame, so the strike pulls out under force.
Oversized modern hardware that looks out of place on a period door.
Locks fitted on a dropped door, so they drag and wear quickly.
A deadlock next to a glass panel with a snib on the inside, which can be opened by breaking the glass and reaching through.

Most of these can be repaired, but it is better to avoid them in the first place.

Rekeying old locks

If you have just bought or moved into a terrace, you will want to know that old keys no longer work. Many old mortice locks and rim locks can be serviced and rekeyed, or have their keys changed, depending on the design and the availability of parts. Where that is not possible, the original lock can be kept for appearance and a modern lock added for security. See lock rekeying.

Looking after a period door between visits

A heritage door that is looked after needs far less lock work. A few simple habits help.

Watch the gap. If the gap between the door and frame starts to look uneven, the door is dropping. Tightening or replacing hinge screws early stops it getting worse.
Mind the weather. Doors facing west or onto the street swell in wet weather. If a lock binds every winter, the door may need easing rather than the lock replacing.
Keep paint off the hardware. Paint on a bolt, keeper or strike makes locks stick. Ask painters to mask or remove hardware.
Service the lock once a year. A little dry lubricant in the cylinder and on the bolt keeps old mechanisms moving freely.
Do not slam the door. Old joints and glass panels take the shock every time.
Keep spare keys for original locks. Blanks for some old locks are hard to find. A spare cut while the original key is in good shape saves trouble later.

These habits cost nothing and keep the original hardware working for years.

Questions to ask before anyone cuts your door

Before any new lock is fitted to a period door, ask:

Where exactly will the lock go, and is that solid timber?
Will the lock be clear of the rail joints and any glass?
Is a rim or mortice lock better for this particular door, and why?
What will the outside look like when it is finished?
How will the strike be fixed into the frame?

A careful locksmith will answer all five before picking up a drill.

What a heritage door job usually involves

A typical visit for a terrace front door looks like this.

We look at the door. Construction, condition, hinges, frame, existing hardware.
We discuss options. Repair, rekey, add a deadlock, or replace a worn lock.
We agree placement and finish with you before cutting anything.
We adjust the door if it has dropped, so the locks work smoothly.
We fit and test the hardware, and fix the strike into solid timber.
We tidy up, including any old holes we can sensibly fill.

See door lock installation and residential locksmith.

The bottom line

Heritage doors deserve careful work. Repair original locks where you can. When adding security, place new locks in solid timber away from joints and glass, fix the strike into a sound frame, and choose finishes that suit the door. Check with council before replacing an original door rather than upgrading its hardware.

For advice on your terrace door, call Surry Hills Locksmith Service on 02 3820 5414, open 7 days, 7:00am to 12:00am, or request a quote.

Heritage Door Locksmith: Securing Period Terrace Doors