Will double glazing stop my windows fogging up?

It reduces it a great deal. Condensation forms when warm, moist indoor air meets a cold surface. A double-glazed Low-E unit keeps the inner pane much warmer, so in normal conditions it stays above the point where moisture forms and the streaming stops. Good ventilation and a thermally broken frame help further.

What's Low-E glass, and do I need it?

Low-E (low-emissivity) is a microscopically thin metallic coating on the glass that reflects heat back into the room while still letting light through. It lifts the thermal performance of a double-glazed unit a long way for a small added cost, so we spec it as standard on thermal upgrades.

Can I get double glazing without replacing the whole window?

Often, yes. If your timber frames are sound and square, insert sashes drop new thermally broken, double-glazed sashes straight into the existing timber frames. There's no interior make-good, and it's usually the most affordable way to double glaze. If the frames are past their best, or you're resizing an opening, a full replacement is the better long-term call. We'll talk it through at quote stage.

Can I finance double glazing?

Several NZ banks offer reduced-rate or interest-free energy loans that cover double glazing and thermally broken windows, including ANZ's Good Energy Home Loan, Westpac's Greater Choices Home Loan and BNZ's Better Future top-up. They usually beat a standard personal loan. We itemise the quote so it's easy to take to your bank, and our financing guide has the details.

Double Glazing Christchurch | Lume Windows + Doors

Double glazing

What you'll notice with double glazing.

A double-glazed unit is two panes of glass sealed around a spacer, with a still layer of gas trapped between them. That layer is a poor conductor, so much less heat escapes through the glass than it would through a single pane. Add a near-invisible Low-E coating and a thermally broken aluminium frame and the inner pane stays warm enough to keep clear of condensation in normal conditions. We build and fit the whole thing ourselves, so what you're quoted is what you get.

A Christchurch home with new Low-E double-glazed aluminium windows

Lower power bills

Swapping single glazing for Low-E double glazing in a thermally broken frame can cut heat loss through the window by up to 73%.* Your heater then spends less time running to hold the same room temperature.

Dry windows in the morning

The inner pane stays warm enough that moisture stops settling on it, so you wake up to clear glass and dry sills instead of reaching for a towel.

Quieter rooms

The sealed unit dampens road and neighbourhood noise. On the busier streets around Christchurch that makes a real difference.

No cold zone by the glass

Single glazing leaves a cold pocket near the window. Double glazing evens the temperature across the room, so the whole space stays usable in winter.

Better resale appeal

A warm, dry, efficient home is an easy thing to sell, and double glazing is increasingly what buyers expect to find.

Two ways to get there

Keep your timber surrounds with insert sashes, or replace the window outright. Both give you Low-E double glazing, and we'll point you to whichever works out better value for your home.

*Indicative figures only. They are derived from typical industry U-values rather than testing of a specific Lume unit, and describe heat loss through the window itself, not a total household energy saving. Actual performance depends on window size, glass configuration, frame type, install quality and your home's conditions. Certified performance data for your specified joinery is available on request.

Recent work

See it in real homes.

A slice of what we've fitted lately: villas, new builds, doors and the odd showroom. Filter by project type, tap any to see the detail.

Our suites

Two systems. Specced for your job.

Both share the same frame profile and hardware family: pick by thermal performance and opening size. We'll spec the right one during quote.

300 Series

Standard residential

Our everyday suite for homes and apartments. Solid performance without the premium price tag.

Energy-efficient double glazing

A range of colours and finishes

Low-maintenance aluminium frames

Tested to meet or exceed NZS4211 for Very High Wind Zones

Spec my project →

800 Series Thermal

Thermally broken

Aluminium with a polyamide thermal break. Cuts frame heat loss by up to 60%,* reducing cold spots and condensation risk, and future-proofed for tighter H1 requirements.

Thermal break reduces heat loss

Warmer rooms and lower power bills

Reduces cold spots and condensation risk

Future-proofs your home for tighter H1 rules

Spec my project →

*Indicative figure only, describing heat loss through the frame rather than a total household energy saving. Based on BRANZ testing of thermally broken versus standard aluminium frames, as reported by Level (level.org.nz). Actual performance depends on frame size, glazing specification, install quality and your home's conditions. Certified performance data for your specified joinery is available on request.

Double glazing

The questions we hear most.

Can't find what you're after? Send us a note and we'll come back inside three working days.

For most homes, yes. Going from single glazing to Low-E double glazing in thermally broken frames can cut heat loss through the window by up to 73% compared with single-glazed standard frames. You get a warmer, quieter home with far less condensation and better resale appeal, and the saving keeps adding up over the decades the joinery lasts. (That 73% is an estimate for heat loss through the window; actual performance depends on window size, glazing specification and install quality, and it isn't a total household energy saving.)