The terraces of Paddington and Woollahra, and the Federation homes of Waverley and Queens Park, are some of the most beautiful houses in Sydney. Many still have their original front doors: heavy, solid timber, often with fanlights, leadlight panels and brass hardware. Those doors deserve care. A lock change done in a hurry can split century-old timber, leave visible scars on a heritage façade, or simply look wrong.
This guide explains how we approach locks on heritage and period doors, what can be saved, how to add security sensitively, and what to think about for back doors, lane gates and windows.
What you will typically find
Original mortice locks
A mortice lock sits inside a pocket cut into the edge of the door, rather than on its surface. Many terraces still have original or early mortice locks with a large keyhole and a lever mechanism. Some work beautifully after a hundred years. Others are worn, missing keys, or offer little real security by modern standards.
Rim locks and latches
Some period doors have a rim lock — a box mounted on the inside face of the door — or a later rim night latch. These are easy to recognise and often original to the house.
Later additions
Over the decades many heritage doors have collected extra locks: a deadlock added in the 1970s, a newer latch in the 1990s, old holes filled with putty. Part of our job is often working out which hardware is doing anything useful.
Can the original lock be saved?
Often, yes. A worn mortice lock can usually be removed, cleaned, adjusted and fitted with new springs or levers. Missing keys can sometimes be made to suit. Servicing keeps the original hardware in place, avoids new cuts to the door and preserves the character of the entry. See lock repair.
The honest limit is security. Many older lever locks were not designed to resist modern attack methods. Keeping the original lock for character, and adding a discreet modern lock for security, is often the best of both worlds.
Adding security without spoiling the door
A discreet deadlock
A quality deadlock fitted above or below the original lock gives the door a second strong locking point. Choosing a finish that matches existing brass or bronze, and positioning it carefully, keeps it unobtrusive from the street.
Reusing existing cut-outs
Where an old lock has already been removed, its pocket or holes can often be reused for the new lock. That avoids fresh cuts and reduces the risk of splitting dry timber.
Reinforcing the strike
On old doors the weak point is often the frame, not the lock. A reinforced strike plate fixed with long screws into the frame behind the jamb can do more for security than an extra lock. See security locksmith.
Glass panels and fanlights
Many period front doors have glass in or near them. A thumb-turn inside can be reached through broken glass. Options include a key-operated deadlock (with the key kept nearby for fire safety, never in the lock), or laminated glass fitted by a glazier. We will talk through the trade-off with you; see deadlock vs deadlatch.
Working with old timber
Century-old doors are often dry, have been painted many times, and may have been repaired before. We:
- Measure carefully before any cut.
- Use sharp tools and work slowly.
- Avoid oversized holes.
- Support the door properly while working.
- Recommend a joiner where timber repair is needed rather than covering damage with hardware.
If a door has dropped on its hinges — common on steep Paddington streets where terraces have settled — we adjust it so the lock works without force. Many "broken" period locks are simply out of line.
Heritage conservation areas
Much of Paddington and Woollahra, and parts of Waverley, sit within heritage conservation areas. Changes visible from the street may need to respect the character of the building, and some changes may need approval from the council. Like-for-like repairs and discreet security hardware are usually straightforward, but if you are planning a visible change, such as replacing a front door or adding a security screen to the street façade, check with Woollahra or Waverley Council first.
Back doors and rear lanes
Paddington's rear lanes are part of its charm, but they give quiet access to back gates, garages and courtyard doors. On many terraces, the back is the real weak point:
- Back doors often have only a simple latch. A deadlock and a reinforced strike make a big difference.
- Lane gates need a lock suited to the gate and a strong post.
- Garage and studio doors opening onto lanes need their own locks.
See our Paddington page for more local detail.
Sash windows
Timber double-hung sash windows are a feature of many period homes, and they are often unlocked or held only by an old catch. Sash window locks can be fitted carefully to soft or painted frames, and some allow the window to be locked slightly open for ventilation. On upper floors, restrictors help with child safety. See window locks.
French doors and verandahs
Federation homes often have French doors opening to verandahs or gardens. These pairs of doors need locks on both leaves — usually a lock on the active door and bolts top and bottom on the other. Old bolts often no longer reach their keepers because the doors have moved. Realigning them is a simple, effective improvement.
Maintenance for period hardware
- Lubricate mortice locks with a dry or lock-specific lubricant once or twice a year.
- Do not paint over hardware or keepers.
- If the key starts to stick, have the door checked before forcing it.
- Keep a spare key for an original lock — finding blanks for old locks can take time.
When replacement is the right answer
Sometimes an original lock is beyond saving: cracked, missing parts, or simply too insecure to be the only lock. In that case we look for a replacement that suits the door's period and fits the existing pocket where possible. You keep the look of the entry while gaining reliable function. See lock replacement and door lock installation.
A typical heritage door visit
- Look at the door, frame, hinges and existing hardware.
- Discuss what to keep, what to service and what to add.
- Agree a price before starting.
- Service the original lock and adjust the door.
- Fit discreet additional security where agreed.
- Test everything and hand over the keys.
Questions we are often asked
Can you make a key for my original lock? Often, depending on the lock. Bring the lock or let us look at it.
Will a deadlock damage my heritage door? Not if it is fitted carefully, reusing cut-outs where possible.
Do I need council approval? For like-for-like repairs, usually not. For visible changes in a heritage conservation area, check with your council.
Security screens on period homes
Security screen doors are popular because they let air in while keeping the main door open. On a heritage façade, though, a screen can look out of place. Options that work well on terraces include screens with a slim frame painted to match the door, or fitting the screen to the rear courtyard door rather than the street door. Screen locks need the same care as main door locks: a good cylinder, a strike fixed into solid timber, and correct alignment so the lock engages without force. We repair and replace locks on existing security screens; for a new screen, a specialist screen manufacturer will measure and supply it.
Keys for old locks
Original lever locks often use keys that cannot be cut at an ordinary key kiosk. If you have only one key for an old lock, get a spare made before it is lost. Losing the only key to an original lock can mean removing the lock to make a new key, which takes longer than cutting a copy from a working key. Keep spare keys for period hardware somewhere safe inside the house, and label them in a way that does not reveal the address.
Combining work on one visit
Heritage jobs often involve several small tasks: servicing the front door lock, adjusting a dropped back door, fixing French door bolts and adding sash locks. Doing them together saves time and travel, and means the whole house is looked at as one system rather than door by door.
Respecting the finish
Brass, bronze and painted finishes on period doors are part of their character. Where we add hardware, we match the finish as closely as possible, protect surrounding paint while working, and avoid leaving visible screw heads or filler on the street side of the door.
Talk to a locksmith who respects old doors
Call Lizzy Locksmith Bondi Junction on 02 6423 0404, open 7 days, 8:00am – 7:00pm, or send a quote request with a photo of your door. We work on terraces and period homes across Paddington, Woollahra, Waverley and Queens Park.
- Heritage homes
- Terraces
- Mortice locks