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Retrofit double glazing installed in Melbourne home timber window frames
Retrofit Specialists

Upgrade Your WindowsNot Your Frames

From $495/m² — Keep your existing timber or aluminium. Double the performance.

  • Melbourne Owned
  • From $495/m²
  • 4.9★ Reviews
  • Free Measure & Quote
  • 24/7 Emergency Glass

Why Retrofit

6 Reasons toRetrofit

Keep Your Existing Frames

Retrofit installs into your current timber or aluminium — no structural work, no demolition, no mess.

Installed in One Day

Most Melbourne homes are completed in a single visit. You're back to normal by sundown.

From $495/m²

Half the cost of full window replacement with equivalent thermal and acoustic performance.

Up to 40% Energy Saving

Cut heating and cooling bills year-round. The glass upgrade that actually pays for itself.

10-Year Warranty

Glass and workmanship guaranteed in writing — not just a verbal promise.

Melbourne-Wide Coverage

We service all suburbs from the CBD to the Mornington Peninsula. No travel surcharges.

Choose Your Glass

Four performance tiers. Every budget. Transparent pricing — no surprises at invoice.

Standard Clear Double Glazing

Reliable thermal and acoustic baseline for most Melbourne homes.

U-Value
2.7W/m²K
Rw Rating
35dB
Heat Reduction
50%
From
$495/m²

Best for: Most homes, balanced performance

Learn more

Tinted Low-E

Maximum thermal control for west-facing or solar-heavy rooms.

U-Value
1.8W/m²K
Rw Rating
36dB
Heat Reduction
78%
From
$595/m²

Best for: Hot rooms, energy bill reduction

Learn more

Acoustic Laminated

Specialist glass for traffic, planes, and neighbour noise.

U-Value
2.4W/m²K
Rw Rating
42dB
Heat Reduction
45%
From
$645/m²

Best for: Busy roads, flight paths, party walls

Learn more

Triple Glazed

Premium thermal and acoustic performance for full home comfort.

U-Value
1W/m²K
Rw Rating
40dB
Heat Reduction
85%
From
$795/m²

Best for: Maximum energy efficiency, cold climates

Learn more

How It Works

Four steps from enquiry to a warmer, quieter home.

Get Instant Estimate
  1. Hands using a laser tape measure on an existing window frame

    Measure Online

    Enter your window dimensions into our Instant Estimate Tool. Get a transparent price in 60 seconds — no site visit required.

  2. Glazier carefully lifting a double-glazed unit into a window frame

    Confirm Your Quote

    A King technician reviews your submission. You receive an itemised quote within 24 hours. No vague estimates, no pressure.

  3. Glazier peeling protective film from a finished double-glazed window

    We Install

    Our crew fits new double-glazed units directly into your existing frames. One day. No structural work. No mess.

  4. Homeowner opening a new double-glazed window in a Melbourne home

    You Save

    Lower energy bills from day one. Quieter rooms. Government rebate paperwork handled by us.

Retrofit vs The Alternatives

How We Compare

Retrofit delivers full-replacement performance at half the cost and none of the mess.

FeatureKingRetrofitFull
Replacement
Secondary
Glazing
Typical costFrom $495/m²From $1,200/m²From $350/m²
Installation time1 day3–7 days1–2 days
Frame disruptionNoneFull demolitionNone
Heritage / period windows
Thermal performance (U-value)1.1–2.0 W/m²K1.1–2.0 W/m²K2.5+ W/m²K
Acoustic performance (Rw)30–52 dB30–52 dB20–28 dB
VEU rebate eligible
Warranty10 years5–10 years2–5 years
Council approval usually required

* Prices are indicative and market-dependent. King Retrofit prices guaranteed at time of quote.

Real Results

The Difference Is Real

Measured results from Melbourne homes. Not marketing copy.

Before
Single-pane window covered in condensation before double glazing retrofit
After
Crystal clear double-glazed window with zero condensation after King retrofit
Before
Old, rotting single-glaze window frame before double glazing upgrade
After
Sleek retrofitted double-glazed window in restored heritage timber frame
Measurement
Before
After King Retrofit

Bedroom temp at 11 pm (summer)

−7° without extra air con

29°C
22°C

Quarterly energy bill

−41% average saving

$430
$255

Street noise (Rw measurement)

Halved perceived loudness

62dB
34dB

Window condensation

Warm inner pane eliminates dew point

Daily
Zero

Results vary by home size, orientation, and glass type selected. Data from King customer surveys 2024–2025.

Customer Reviews

Melbourne Homes.Real Feedback.

Every review is from a verified retrofit customer.

5.0 · 18 Reviews · Google

Heating bill dropped noticeably in the first month. Our Victorian terrace was a nightmare to heat — now the lounge actually holds temperature overnight. The retrofit took one day and the crew left the place spotless.

Sarah M.

Sarah M.

Fitzroy North · Google

We live 40 metres from a tram stop. The acoustic difference after the laminated glass went in was honestly shocking. I didn't expect it to be that dramatic. Wish we'd done it ten years ago.

David K.

David K.

Richmond · Google

Got three quotes. King came in $2,100 less than the next cheapest and finished the job in a single day. No upselling, no vague pricing — the final invoice matched the online estimate exactly.

Jen & Tom R.

Balwyn · Google

Was sceptical about retrofit vs full replacement. A friend told me to just do the full windows. Glad I ignored him. You cannot tell the difference visually, and the performance specs are identical.

Michael A.

St Kilda · Google

West-facing bedroom was genuinely unusable in summer — 34°C at 9pm. Tinted Low-E glass has fixed it completely. Air con barely runs now. The estimate tool online gave me the exact price before anyone even came out.

Anna P.

Camberwell · Google

Used the instant estimate tool to budget before committing. No sales call, no pressure. The price they quoted was the price I paid. That kind of transparency is rare in the trades.

Chris L.

Brighton · Google

Our bedroom faces Sydney Road. Friday and Saturday nights were unusable — we were wearing earplugs to sleep. The acoustic laminated glass has completely changed the situation. The tram noise that used to wake us at 6 am is now barely audible. I genuinely did not think glass could make that much difference.

Marcus & Priya N.

Brunswick · Google

Flight path noise was the main reason we almost moved. A friend suggested acoustic glazing as a last resort before we listed the house. We're not moving. The difference in the front rooms is night and day — my daughter actually sleeps through now. Worth every cent.

Helen C.

Port Melbourne · Google

Our gas bills were brutal every winter — the old single-pane windows were just radiating cold into the rooms. We went with Low-E double glazing throughout. First winter after: $380 less on gas over the quarter. The house holds heat in a way it never did before. We wished we'd done it when we bought the place.

Rob & Diane F.

Glen Waverley · Google

I was skeptical about the energy saving claims — they always sound too good. But the condensation alone proved the point: zero condensation on the inner pane since installation, where before it was streaming every winter morning. The heating runs half as often. The numbers are real.

Yasmin T.

Northcote · Google

We were told by two other glaziers that we'd need council approval and a heritage consultant before touching the windows. King told us that a glass-only retrofit is permit-exempt — kept the frames, just replaced the glass. They were right. No permit, no consultant, done in one day. The house looks exactly the same from the street, and the draughts are completely gone.

Oliver & Kate B.

Carlton · Google

Our Victorian terrace is on the Heritage Overlay and I was nervous about any window work. King assessed the frames, confirmed the retrofit was permit-free, and did the whole house in a day. The original sash windows still look original — you'd never know the glass had changed. Warmer, quieter, no heritage headache.

Fiona M.

Fitzroy · Google

Woke up to a burglary at 3am — back door glass completely smashed. Called King at 6am, glazier was here by 7:45am, property secured before we left for work. Didn't expect anyone to show up that fast. They boarded it properly, not just cardboard, and came back two days later with the permanent glass. Exactly what you need when you're in shock.

Paul & Sandra O.

Hawthorn · Google

Tenant called me at 7pm on a Friday — kitchen window smashed. King had a glazier there by 9pm and replaced the glass permanently on the same visit. No board-up, no return trip, no landlord nightmare over the weekend. I've used them for three emergency jobs now and the response is always the same.

Rental Manager — South Yarra

South Yarra · Google

Storm took out my lounge window at 11pm on a Wednesday. I expected to be told someone would come in the morning. King had a glazier here within the hour. He cleaned up the glass, boarded the frame properly, and the permanent replacement was fitted two days later. Professional job, not a handyman with a piece of wood.

Diane K.

Footscray · Google

We manage 14 strata buildings across Melbourne. King handles all our glazing — routine replacements, double glazing retrofits on older blocks, and emergency call-outs. The invoicing is clean, the pricing is consistent, and they show up when they say they will. That last part is rarer than it should be.

James R. — Strata Manager

South Melbourne · Google

Needed a full shopfront glass installation done over a weekend so we could open Monday. King confirmed the timeline, showed up Saturday morning, and were done by Sunday afternoon. The glass is immaculate — not a mark on it. Every trade we brought in for the fitout delivered late except these guys.

Natalie W. — Retail Fitout

Collingwood · Google

Used King on a 12-unit apartment project — double glazing throughout plus frameless balustrades on the upper levels. Scope was substantial and they handled it without the project management headaches I've had with other glaziers. Itemised quotes, predictable scheduling, zero defects at handover. We're using them on the next project.

Tom B. — Property Developer

Richmond · Google

FAQ

Common Questions

Everything Melbourne homeowners ask before booking.

What exactly is retrofit double glazing?

Retrofit double glazing replaces only the glass unit inside your existing window frame — the timber or aluminium surround stays in place. A glazier removes the original single-pane glass and installs a sealed, factory-made double-glazed unit (two panes of glass separated by an inert gas cavity) in its place. You get the full thermal and acoustic benefit of double glazing without touching the frame, architraves, or surrounding wall.

Can any window be retrofitted?

Most standard timber and aluminium frames in Melbourne homes are suitable, provided the rebate (the groove the glass sits in) is deep enough to accept a double-glazed unit — typically 28–36 mm. Casement, awning, sliding, and fixed windows are all compatible. Very thin heritage sashes may need a slightly thinner unit; our technician confirms suitability at measure-up.

How long does installation take?

A standard Melbourne home with 8–14 windows is typically completed in one day. We remove the old glass, install the new double-glazed units, re-seal, and clean up before we leave. There is no structural work and no plaster damage.

Will the windows look different from the outside?

No. The frame stays identical. From street level — and from inside — retrofitted windows are visually indistinguishable from the originals. The only change visible if you look closely is a small aluminium or warm-edge spacer bar around the glass perimeter, which is recessed into the rebate.

Is retrofit double glazing eligible for Victorian government rebates?

Yes. Retrofit double glazing qualifies for the Victorian Energy Upgrades (VEU) program. Depending on your home's heating zone and the glass specification chosen, the rebate can offset $300–$900 per typical home. We handle the paperwork — you just sign.

How does the thermal performance compare to full window replacement?

Identically, glass for glass. Both retrofit and full-replacement windows use the same factory-sealed double-glazed units. The U-value and SHGC of the glass — which determine thermal performance — are set by the glass specification, not by the frame type. You get the same Low-E coating, the same gas fill, the same spacer, and the same performance at roughly half the price.

What U-value and acoustic rating can I expect?

U-value depends on the glass tier you choose: standard clear double glazing achieves around 2.0 W/m²K; Low-E double glazing reaches 1.1–1.4 W/m²K; triple glazing can reach 0.8 W/m²K. Acoustic Rw ratings range from 32 dB (clear double) to 52 dB (laminated acoustic). Our glass options page shows the full specs for each tier.

Can I retrofit heritage or period windows?

Yes — this is one of retrofit's main advantages over full replacement. Because the original frame is preserved, most heritage overlay overlays and council requirements are unaffected. We regularly work on Victorian and Edwardian timber sashes across inner Melbourne suburbs. If your property is on the Heritage Overlay we recommend confirming with your council first, but in almost all cases retrofit glazing is permitted without a planning permit.

How much noise reduction will I actually notice?

Objectively: our standard laminated acoustic unit achieves Rw 38, cutting perceived loudness by roughly half compared to a single-pane window (Rw 26). In practice, customers near tram lines or arterial roads describe the difference as "dramatic" — the low-frequency rumble that travels through single glazing is the first thing to disappear. Acoustic laminated glass performs significantly better than standard double glazing for noise.

What warranty do you provide?

King provides a 10-year written warranty covering the sealed glass unit (against seal failure and fogging), the installation workmanship, and all associated hardware. The warranty is transferable to a new owner if you sell your home. Glass breakage is not covered — that is covered under your building insurance.

Get YourInstant Estimate

Enter your window dimensions and get a transparent, itemised price in 60 seconds. No sales calls. No site visit required.

No site visit required

Price locked at quote

10-year warranty

Melbourne-wide