That grinding noise when you open your sliding door is the roller assembly. Once the wheel is worn through to its axle, the door rides on metal, and no amount of lubrication fixes that. But what comes next depends entirely on what your door is made of.
In over 15 years of sliding door repairs across Sydney, from harbourside apartments in Balmain to brick veneer homes in the Hills District, the most common misconception we encounter is that a failing door needs replacing. It almost never does. The door is almost always fine. The hardware has worn out. And timber and aluminium doors wear in completely different ways.
Timber and aluminium sliding doors share the same basic mechanism: rollers, track, lock, and weatherseal. But they fail for completely different reasons and need different repairs as a result. Most homeowners don’t know what material their door is made from until someone asks. If yours is a warm-looking frame with visible timber grain and was installed before 2000, it’s almost certainly timber, likely western red cedar or Australian hardwood. If the frame is slim, metallic, and powder-coated white, grey, or bronze, it’s aluminium.
That distinction matters because the fault your door develops, the parts that fail, and the repair process are not the same for both. This guide covers both. By the end, you’ll know what your door is likely doing wrong, why, and what fixing it actually involves.
What aluminium sliding doors are made of, and what fails
Aluminium sliding doors dominate Sydney’s residential building stock from the 1970s onward. The frame is extruded aluminium: lightweight, dimensionally stable, and resistant to the kind of moisture damage that affects timber. The glass panel is usually tempered or laminated safety glass, and the rollers are nylon or steel wheel assemblies housed in a carrier that clips into the bottom rail of the door.
Aluminium doesn’t swell, warp, or rot. That’s its advantage. But it oxidises, the hardware corrodes, and the rollers compress. In coastal suburbs including Manly, Bondi, Cronulla, and Balmain, salt air accelerates every one of those processes. A nylon roller that might last twelve years in Parramatta may need replacing in five years in a ground-floor apartment on Campbell Parade.
What fails on an aluminium door
Rollers. The nylon wheel inside the roller carrier wears down through use and UV exposure. In coastal conditions, salt grit works into the bearing and acts as an abrasive. The wheel compresses, then flattens, then eventually collapses. At that point the aluminium bottom rail drops onto the track channel and the door stops moving freely. You’ll hear it as a grinding or dragging sound, and you’ll feel it as resistance that gets worse the longer it’s left.
Track channel. When a door runs on worn rollers long enough, the bottom rail scores the aluminium track. The track develops a groove where the rail has been grinding. Fitting new rollers in a scored track causes the new rollers to bed into the same groove and fail prematurely. This is the most common reason a roller replacement doesn’t solve the problem: the track was damaged before the new rollers went in. Our door track repair service addresses both the scored surface and the capping that protects it before new rollers are fitted.
Weatherseals and mohair. The pile seal running along the edges of the door sash compresses and mats from years of contact. The bottom blade seal cracks. The result is draughts, dust infiltration, and water ingress around the door, often mistaken for a frame problem but almost always a seal problem.
Locks and latch alignment. When rollers wear and the door drops, the latch bolt no longer meets the lock keep squarely. The door won’t lock without lifting it. The lock itself is usually fine. The alignment problem is caused entirely by the roller wear dropping the sash height.
Frame oxidisation. The powder coat on aluminium frames chalks and flakes in harsh UV and coastal exposure, and the bare aluminium beneath begins to pit. This is cosmetic until it reaches the extrusion joint at the corner of the frame, where it can cause the fasteners holding the frame around the glass to corrode and the frame to open at the corners.
What timber sliding doors are made of, and what fails
Timber sliding doors were the default in Sydney from the 1960s through the late 1990s. The most common species is western red cedar, a naturally rot-resistant softwood with good dimensional stability for its weight. Australian hardwoods appear in higher-specification doors. Radiata pine appears in some doors from the 1980s and 1990s, and unlike cedar, it has no natural rot resistance and relies entirely on its paint system.
Timber doors are heavier than aluminium doors of the same size. A standard single timber and glass sliding door can weigh 60 to 100 kilograms or more. That weight is the defining fact of timber sliding door repair. Everything about how timber doors fail and how they’re repaired flows from that number.
What fails on a timber door
Rollers, faster and harder. Because timber doors are heavier than aluminium doors, they impose far greater loads on the roller assembly. The standard roller fitted to a timber door from the factory is often undersized for the actual panel weight, particularly on cedar doors where glass spans have grown larger over the decades. The rollers don’t just wear. They disintegrate. When a timber door roller collapses, the bottom timber rail drops directly onto the brass or aluminium track. The rail is soft enough that it bruises. The timber beneath the rail can crush and deform, which changes the geometry of the repair.
Timber rot at the threshold. The bottom section of the door frame, the threshold, sits horizontally at sill level and collects water. Western red cedar has reasonable rot resistance, but when the paint system fails at the threshold joint, water infiltrates the end grain of the timber and rot begins. Radiata pine thresholds rot much faster and more extensively. A rotted threshold doesn’t just affect the door’s appearance. It compromises the structural support for the track and the door’s ability to travel level.
Swelling and frame distortion. Timber expands in wet weather and contracts in dry weather. Sydney’s climate, with humid wet seasons and dry summers, puts this cycle through its range every year. A door that was perfectly adjusted in winter may bind in summer as the frame swells, or develop gaps in winter as it dries back. Aluminium doors don’t do this. For a timber door, seasonal maintenance is a feature of ownership, not an exception.
Paint system failure. When the external paint on a timber door fails by blistering, peeling, or cracking at joints, the timber beneath is exposed. Moisture enters at the face and at end grain joints. The window between first paint failure and timber rot in Sydney’s climate is shorter than most homeowners expect. A door that looks cosmetically rough may have structurally sound timber beneath; a door that looks sound but hasn’t been repainted in a decade may have rot advancing at the joints.
Track wear, compounded by weight. The track beneath a timber door carries the same weight as the door itself, substantially more than an aluminium door. When rollers wear and the timber rail drops onto the track, the track wears faster and more deeply than it would under an aluminium door. Track capping, fitting a stainless steel liner over the damaged extrusion, is almost always necessary as part of a timber door repair. New rollers in a scored timber door track fail within months.
How the repair process differs
This is where the two door types diverge most sharply, not just in the parts used but in the sequence of the work. All repairs on both door types are conducted in compliance with AS 2047, the Australian Standard for windows and external glazed doors, which governs performance requirements for sliding door systems.
Aluminium door repair: the standard process
Remove the security screen if present. Remove the fixed panel. Remove the sliding door by lifting the sash out of the bottom track and tilting it inward. Lay the door on its edge and extract the bottom rail from the frame. Remove the worn roller carriers from the rail extrusion, fit matched replacement carriers with nylon or twin bogie roller wheels, and refit the rail. Inspect the track channel, clean debris, and if the track is scored, cap it with a new stainless steel liner. Rehang the door, adjust the roller height to centre the sash correctly in the frame, and align the lock. Inspect and replace weatherseals if required. Test the door against the one-finger glide standard. If it doesn’t close easily with one finger, the job isn’t done.
An aluminium sliding door repair in reasonable condition is typically a two to three-hour job. Most technicians carry the common roller assemblies for Sydney’s aluminium door brands, including Stegbar, Trend, Airlite, and Bradnams, on every van.
Timber door repair: the additional steps
The timber door process includes everything in the aluminium repair, plus additional work that aluminium never needs.
The bottom rail of the door is inspected for bruising and deformation where it has been dropping onto the track. If the timber is bruised or compressed, the rail needs to be planed or trimmed before the new roller recesses can be cut. A standard router is used to cut new housing pockets in the underside of the rail for the twin bogie roller carriers. The reason twin bogie rollers are specified for timber doors, rather than the standard two-roller carriers used on lighter aluminium doors, is load distribution. A twin bogie roller has four contact points rather than two, spreading the panel weight across a wider bearing area and extending the service life significantly.
Once the new roller recesses are cut, the exposed timber surfaces are sealed with a penetrating primer. 4-in-1 paint is commonly used to protect the fresh wood against moisture ingress at the cut face. Without this step, the exposed timber at the routed pocket will absorb water and begin to deteriorate within a season.
The threshold is inspected for rot. If rot is present at the end grain or in the horizontal face, it needs to be cut out, the extent of the rot confirmed, and either treated or replaced with new hardwood timber. A threshold replaced in hardwood rather than the original cedar or pine will outlast the door.
The track is almost always replaced rather than simply cleaned. A new aluminium or stainless steel track is fitted to the repaired threshold, and the door is rehung on its new roller system. The roller height is adjusted, the lock is aligned, and the door is tested.
Weather seals on timber doors, typically EPDM rubber rather than the pile seal used on aluminium, are inspected and replaced where they’ve compressed or cracked. EPDM seals on timber doors are critical not just for draught exclusion but for preventing water tracking into the timber frame at the seal contact point.
A full timber sliding door repair typically runs three to four hours. Doors with threshold rot requiring carpentry work will run longer.
If you’ve identified your door type and fault from the sections above, most repairs are completed same-day. Call 1800 203 377 or request a quote online.
What does sliding door repair cost in Sydney?
Repair almost always costs significantly less than replacement. New sliding doors run into the thousands. Repairs are measured in hundreds.
For aluminium sliding doors, most repairs in Sydney fall between $180 and $450 depending on whether the track needs capping alongside the roller replacement. A standard two-roller sash with a clean track sits at the lower end. A door that has been running on failed rollers long enough to score the track sits at the higher end.
For timber sliding doors, repairs run $280 to $550 for a standard service. Doors with threshold rot requiring hardwood carpentry work sit at the higher end and sometimes beyond, depending on the extent of the rot. Even so, a threshold replacement and full roller service on a cedar door is substantially cheaper than a new door supply and installation.
The decision point is simple. If the fault is in the hardware, repair is the right call regardless of the door’s age. If the frame itself has failed structurally, the conversation shifts.
When is repair worth it vs replacement?
For aluminium doors, repair is almost always the right answer. The frame extrudate is dimensionally stable, the glass is typically sound, and new hardware is available for the vast majority of door profiles manufactured in the last fifty years. The only exception is a frame that has corroded at the extrusion joints to the point where the glass is no longer secure, or a frame that has been impact-damaged and is structurally bent.
For timber doors, the repair decision hinges on the threshold. If the timber frame is structurally sound, with sound rails, sound stiles, and intact glass, repair and fresh rollers will restore the door to better-than-new performance. If the threshold has rotted significantly or the frame joints have opened and timber has deformed beyond dressing, the cost of proper carpentry repair approaches the cost of replacement, and the conversation shifts.
There’s also a practical consideration for strata properties. Through our strata door repair and maintenance service, we handle the documentation and coordination that strata repairs require. Replacing a door in a strata building typically requires owners corporation approval, which takes time. Repairing the existing door usually doesn’t. For strata residents with a deteriorating timber door, repair is often the faster and cheaper path, even when the frame is in moderate condition.
The best repair advice is this. Don’t replace a door because the hardware has failed. Replace it because the frame has failed. Hardware is replaceable. The frame is the door.
Sydney-specific factors that affect both door types
Salt air. Within approximately five kilometres of the coast, covering most of the Eastern Suburbs, Northern Beaches, harbourside Inner West, and North Shore suburbs, salt air accelerates every form of hardware corrosion. On aluminium doors, it attacks the roller bearings and the frame’s powder coat. On timber doors, it works into paint film failures faster than in inland suburbs. In our experience servicing doors in Manly and Cronulla, rollers that would last a decade in Penrith are often worn through in four or five years. Coastal properties need their sliding door hardware serviced more frequently. For aluminium doors in coastal locations, stainless steel roller assemblies are the correct specification, not standard nylon.
Building movement. Sydney’s clay-heavy soils cause seasonal frame movement in suburban homes, particularly in the Hills District, Western Sydney, and parts of the North Shore. Timber doors on older properties in areas like Kellyville and Castle Hill are especially prone. The slab shifts under wet weather, and the door that latched perfectly in winter develops a bind by the following summer. Aluminium frames shift as a rigid unit and may need the roller height adjusted; timber frames can twist slightly with the building, creating a diagonal bind that planing alone won’t fix without also adjusting the frame geometry.
Building age. The largest cohort of timber sliding doors in Sydney was installed between the late 1960s and the mid-1990s. Those doors are now thirty to fifty years old. Most have had one roller replacement; some have had none. The rollers fitted from the factory were not twin bogie rated and are failing across the board. The threshold condition varies. Cedar thresholds in houses that have been regularly repainted are often still sound; pine thresholds in houses that haven’t been maintained are often rotted through. If your home was built in this era and the door has never been serviced, it needs attention now. The longer it runs on failed rollers, the more threshold damage accumulates beneath it.
What to tell your technician before they arrive
Knowing your door type saves time on the day. Before you call, check these four things:
Frame material. Look at the edge of the frame where it meets the glass. Aluminium frames have a metallic section, usually powder-coated in a solid colour. Timber frames have a visible wood grain, often painted but showing timber texture at cut edges.
Age and brand. The most common timber door brands in Sydney are Stegbar and Trend, both of which have been manufacturing timber sliding doors since the 1970s. If you can see a brand name on the frame or threshold hardware, note it. If not, the decade of installation is helpful.
Symptom. Is the door grinding (likely rollers)? Binding in the frame (could be seasonal swelling or track damage)? Not locking without lifting (roller wear causing sash drop)? Letting in water along the bottom (seal or threshold issue)? The more specific the symptom, the faster the diagnosis.
Threshold condition. If you can see the threshold, the bottom horizontal section of the door frame, check whether the paint is lifting, the timber is soft or discoloured, or water is sitting in the track channel after rain. These are the signs of threshold rot that affect the repair scope.
Frequently Asked Questions
How much does sliding door repair cost in Sydney?
Most aluminium sliding door repairs in Sydney fall between $180 and $450, depending on whether the track needs capping alongside the roller replacement. Timber sliding door repairs run $280 to $550, depending on the extent of carpentry work required. Doors with threshold rot needing hardwood replacement sit at the higher end. In both cases, repairs cost significantly less than replacement, with new sliding doors running into the thousands.
How do I know if my sliding door is timber or aluminium?
Look at the frame edge where it meets the glass. Aluminium frames are metallic with a powder-coated surface, typically in white, grey, bronze, or silver. Timber frames show wood grain texture and are usually painted white or a heritage colour. If the frame was installed before the late 1990s and the house is an older brick veneer or weatherboard property, it’s very likely timber. Post-2000 installations are almost universally aluminium.
Why does my sliding door grind only in summer?
For aluminium doors, the track channel accumulates more fine grit in dry summer conditions, and the lubricant in the roller bearing dries out faster. For timber doors, the frame swells slightly in humidity. If the swelling is minor, the door binds in the frame without the rollers being the primary fault. Both are worth having looked at before the cycle completes another season of damage.
Can I replace timber sliding door rollers myself?
Technically possible, but not recommended. Timber door roller replacement requires routing new housing pockets in the bottom rail to accept twin bogie carriers, sealing the fresh timber against moisture, inspecting and potentially replacing the threshold, and fitting new track. Using standard two-roller carriers on a heavy timber door, the most common DIY error, results in roller failure within months. The weight of the door means the roller specification matters more than it does for lighter aluminium systems.
Is it better to repair or replace an old timber sliding door?
If the frame is structurally sound, repair is almost always a better value. A properly executed repair with twin bogie rollers, fresh track, and sealed carpentry will outlast many new replacement doors and avoid the cost, lead time, and strata approval process that replacements involves. Replace when the frame itself has failed structurally, not when the hardware has worn out.
How long does a sliding door repair take?
Aluminium sliding doors: two to three hours for a standard roller and track service. Timber sliding doors: three to four hours for a standard service, and longer if carpentry work on the threshold is required.
Getting your door repaired
Whether your door is timber or aluminium, the process starts the same way. A technician arrives, removes the door, assesses the actual fault rather than the surface symptom, and gives you a fixed price before any work begins. Most jobs are completed in a single visit.
For aluminium sliding door repair across Sydney, including roller replacement, track capping, lock realignment, and weather seal service, Lock & Roll carries parts for the most common aluminium door profiles on every van. For timber sliding door repair, we carry twin bogie roller assemblies, replacement track, and sealing materials for cedar, hardwood, and pine frame doors.
The broader sliding door repair Sydney service covers both door types, all brands, and all Sydney suburbs: same-day in most cases, fixed price before we start, backed by our workmanship guarantee.
Call 1800 203 377 or request a quote online.
