Atomic Projects facade remediation on a Sydney strata building
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Window Replacement · Sydney

Windows leaking or failing? Replace the system, not just the glass.

Window, glazing and curtain-wall replacement for Sydney strata and commercial buildings — sealed into the facade properly, compliant with current standards, and staged around residents.

✓ Class 2 DBP Registered✓ Licence 360636C✓ Rope & scaffold access★ 4.7 Google rating
100 +
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$20M +
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15 +
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What is window replacement?

A window is a system: the frame, the glazing, the seals and gaskets, and the flashings that tie it into the facade. When windows leak or fail, the problem is usually in that system — not just the glass. Window replacement is renewing the whole opening — frame, glazing, seals and flashings — so it keeps water out for decades.

Proper replacement starts with knowing why the old one failed — corroded frames, perished seals, missing flashings or movement in the surround. The new system is then specified to current standards and sealed into the facade as one waterproof assembly.

Re-glaze vs replace — the distinction that decides the result: re-glazing swaps the glass and leaves the failed frame, seals and flashings in place. Replacement renews the system and its junction with the facade — which is where the leaks actually are.
Know the symptoms

6 signs your windows are failing.

Windows tell you they're failing long before the water shows inside. If you can see any of these, the system needs diagnosing.

1
Water on sills after rainWater pooling on internal sills means the seals or flashings around the opening have failed.
4
Damp or staining below windowsMoisture marks under an opening are the classic sign water is tracking through the perimeter.
3
Perished or split window sealsCracked, hard or missing sealant and gaskets stop sealing and start funnelling water in.
4
Corroding or pitted framesAluminium and steel frames that are pitting or bleeding rust are past protecting the opening.
5
Fogging between glass panesCondensation inside double glazing means the unit's seal has failed — it can't be repaired, only replaced.
6
Draughts, noise or sticking sashesWindows that whistle, rattle or jam have lost their fit — comfort problem now, water problem later.
⚡ Water coming in around a window? We can assess within days.
Why it matters now

A failed window is a water path into the whole wall.

Window leaks don't stay at the window. Once the perimeter is breached, water reaches the substrate, the interiors and the units below.

01

Compliance & safety

Failing glazing and loose panels above walkways are a safety and compliance risk the owners corporation carries — replacement glazing must meet current Australian Standards.

02

Water spreads behind the wall

A leaking window perimeter lets water into the substrate and the interiors. Caught early it's a seal-and-flashing job; caught late it's internal make-good and facade repair.

03

First impression & asset value

Streaked frames, fogged units and stained sills show up in every inspection — and drag on valuations until they're fixed.

Our approach

Replace the system, not just the glass.

We don't swap glass and hope. We find why the window failed, replace the system, and seal it into the facade — accessed and staged around residents.

1

Diagnose why the window failed

A window leak investigation identifies whether it's seals, flashings, frame corrosion or movement in the surround — before a replacement unit is specified.

2

Specify to current standards

Replacement units specified to current Australian Standards — with acoustic and thermal upgrades where they pay for themselves. Integrated with facade remediation where the surround needs repair.

3

Seal it into the facade

Sills, heads and flashings rebuilt so the opening sheds water as part of the envelope — detailed into cladding and render junctions properly.

4

Stage it around residents

Openings replaced in stages with same-day weather seal, residents in place — closed out with the documentation a defect rectification record should have.

What's covered

The types of window work we do.

Targeted repairs through to full window and curtain-wall replacement — each scoped on its own or as part of a facade program.

Window Leak Investigation & SealingWater-test and trace the real entry point, then seal the failed joints so leaks stop for good — not until the next storm.Read more →
Window & Curtain Wall ReplacementReplace corroded, non-compliant or failed units and curtain-wall sections with modern framing that meets AS 2047.Read more →
Sill, Head & Flashing RepairRebuild leaking sills, heads and perimeter flashings so water is shed away from the opening instead of into it.Read more →
Window Sealant & Gasket RenewalStrip perished perimeter sealant and glazing gaskets and reinstate them to restore the weather seal around every window.Read more →
Curtain Wall RemediationDiagnose and remediate leaking, drummy or failing curtain-wall systems across the facade envelope.Read more →
Acoustic & Thermal Window UpgradesUpgrade to acoustic and thermally broken glazing to cut noise, condensation and energy loss for residents.Read more →
Why Atomic

Why our windows don't leak again.

The cheap quote swaps the glass and leaves. Here's what replacing the system properly means for your building.

What matters
Atomic Projects
Typical contractor
Diagnosis
✓ Cause confirmed before scope
 Swaps the glass over the symptoms
The repair
 Frame, seals and flashings renewed
 Re-glazes into a failed frame
Access
✓ Rope or scaffold, staged over occupants
× Wants the building cleared
Junctions
✓ Windows, cladding & roof detailed in
× Ignores the junctions
Sign-off
✓ Documented and certifiable
× No QA trail
Get a free assessment →
Risk reversal

Sealed to spec. Verify everything.

Most window jobs come back because the last contractor re-sealed over failed flashings. We replace the system — and document it.

✓
Replaced to specificationThe envelope is restored to spec — not sprayed over and hoped to hold.
✓
Class 2 DBP — Licence 360636CVerify us on the NSW Fair Trading register before you call. We'd rather you check.
✓
Rope & scaffold access in-houseWe access at height safely over occupied space — often without a full scaffold or street closure.
✓
Documented and certifiableA QA paper trail your committee, engineer and certifier can audit at any stage.
We'd rather you check than take our word for it.
What happens after you enquire

From first call to fixed quote — no mystery.

1
You enquire

Send the reports you have, or describe the cracking, staining and leaks.

Within 24 hrs
2
Window assessment

We attend — often off ropes — to confirm why the windows are failing.

Days, not weeks
3
Fixed-price scope

A documented, engineer-checkable scope your committee can approve.

Ready for AGM
4
Staged works

Openings replaced in stages, residents in place, sealed the same day.

On your schedule
Is this you?

We're a fit for some buildings, not all.

We'd rather tell you upfront than waste your committee's time.

This is for you if…

  • You manage or own a strata or commercial building with failing windows across multiple units.
  • You have an engineer's report or visible failure that needs proper diagnosis, not a re-seal.
  • The building is occupied and works need to be accessed and staged around residents.
  • You need DBP-compliant documentation your committee and certifier can rely on.
  • Your project is from around $50K and up.

Probably not us if…

  • You want one domestic window swapped — a local glazier is a better fit.
  • You're after the cheapest re-silicone to get through the next inspection.
  • It's a single cracked pane with no leak history — quick glazing repair, not system replacement.
  • You need it done this week without an investigation — we diagnose before we price.
Get a free assessment →
“
They combined three scopes — facade, waterproofing and glazing — into one program and dealt with council directly. We expected twelve months of chaos. It was done in eight, with people living there the whole time.
SL
Strata ManagerMixed-use building, St Leonards
Atomic Projects founder on a Sydney remedial building site
Who you're dealing with

You'll deal with the builder, not a call centre.

Windows are the easiest thing on a building to re-silicone and the hardest to fix once water's inside the wall. We find why they failed, then replace the system properly. Every project, I'm across it personally.

— The Atomic Projects founderClass 2 DBP registered builder · Licence 360636C
Straight answers on price

What window replacement costs in Sydney.

These are realistic ranges — your fixed price is confirmed after a building investigation, before any work starts.

Localised
$50k–$200k

Targeted seal, flashing and hardware renewal to defined openings.

Mid-scale
$200k–$800k

Whole-elevation window replacement across a building.

Large complexes
$1m–$5m+

Full high-rise window and curtain-wall replacement programmes.

All scopes are transparent — the window scope is confirmed by investigation before you commit.

Start with a conversation

Get your building assessed.

Tell us about your building. We'll respond within 24 hours with a site assessment plan and a clear next step.

Get a quote

Tell us about your building. We respond within 24 hours.

Book your free assessment →
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or call 0410 515 509 · No obligation
Common questions

What your committee will want to know.

What does window replacement involve?
It depends what's failed, but typically: removing the old unit, repairing the surround — including any concrete or brickwork — rebuilding sills, heads and flashings, then installing and sealing the new window or curtain-wall section as one waterproof assembly.
Do you need a full scaffold?+
Not always. We access windows off ropes (industrial rope access) and swing stages as well as scaffold, choosing the method that suits the elevation and keeps residents in place.
How long does window replacement take?
Individual openings are typically replaced and weather-sealed the same day; whole-elevation programs run weeks to months depending on access. The investigation confirms scope and programme before works start.
Why not just re-seal or re-glaze?
Because sealant can't fix what's underneath it. If the frame is corroded, the flashings are missing or the surround is moving, new silicone or glass just resets the clock on the same failure.
Can you handle curtain walls as part of the work?
Yes. Windows and curtain walls are part of the envelope, and we scope them with the rest of the facade — including cladding replacement where panels and glazing meet.
What causes window leaks and failures?
The usual causes are perished perimeter sealant and gaskets, missing or failed sill and head flashings, corroded frames, and movement in the surrounding structure. The visible drip is usually downstream of the actual entry point.
Will the work disrupt residents or tenants?+
Window replacement is staged unit-by-unit with same-day weather seal, so residents stay in place. We coordinate access with building management and keep noisy work inside agreed hours.
Are you registered for regulated window work?
Yes — Class 2 DBP registered, Licence 360636C, verifiable on the NSW Fair Trading register. Window and curtain-wall work affecting waterproofing or structure on Class 2 buildings is delivered under declared designs.
How much does window replacement cost in a strata building?+
The main drivers are the number of openings, the window system specified, facade access and how much surrounding remediation the openings need once frames come out. Building-wide window programs commonly sit within the $200K to $2M+ remedial range, while smaller scopes cost less. The online estimator gives a starting range before an inspection defines the real scope.
Are windows common property in NSW strata buildings?+
Generally, yes. External windows and doors in the boundary wall are usually common property, which makes them the owners corporation's responsibility to repair or replace rather than the individual lot owner's. There are exceptions depending on your strata plan and by-laws, so check both before budgeting. It is one reason window failures should go to the strata manager early.
How long is the opening exposed while a window is replaced?+
Openings are never left open overnight. If a window comes out and the new unit is not going straight in, a solid, lockable, weatherproof hoarding is fitted the same day, keeping the unit secure and dry while fabrication or surrounding works finish. You get specific dates in advance so you know exactly when your opening is affected.
Do replacement windows have to meet current standards?+
Yes. New windows are installed to the current National Construction Code and relevant Australian Standards requirements, including safety glazing and weatherproofing details, even where the originals predated them. Flashings and sealant junctions are detailed so the new unit ties into the facade correctly, because most window leaks start at the perimeter rather than through the frame itself.
What warranty do new windows come with?+
The installation is covered by the contractor's defects liability period, typically 12 months, plus NSW statutory warranties, and the window units themselves carry the manufacturer's product warranty. All of it is documented in the handover pack along with inspection records for the flashing and sealing details, which is what matters if a leak is ever alleged later.

Your windows keep the weather out — or they don't.

Diagnosed to the cause, replaced to current standards, sealed into the facade and documented. Book a free assessment or a 15-min call.

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