Older homes across New Zealand are full of charm, but their windows often let them down. Draughts, rattles and condensation are common problems that make living less comfortable. Haydon Rogers, product specifications manager at Altus, sees it every day. He says renovation is now a major part of their work because so many villas, bungalows and early state houses are reaching the point where windows need upgrading. The challenge for homeowners is finding a way to improve comfort without losing the character that makes these houses special.

How insert windows work

Haydon explains that insert windows were designed to solve this very problem. Rather than pulling out the whole frame, the insert system removes the sash and glass but leaves the outer timber surround intact. The new unit then fits neatly inside, so the cladding and trims remain as they were. From the street, the home looks unchanged, but inside it feels warmer, quieter and easier to live in.

There is also scope to modernise interiors without affecting the exterior. Haydon points to dual-colour options as a popular choice. Homeowners might keep a traditional white frame on the outside but select a darker tone indoors to match a contemporary renovation. “Little do they know and then they walk inside they’re presented with an ultra-modern interior which the windows are playing a significant part in.” Thermal inserts add another layer of comfort, reducing cold spots and helping control condensation in winter.

When a full replacement is the better option

Insert windows are not suitable in every case. If the existing timber is badly damaged by rot or warping, Haydon says a full replacement may be required. That means removing the frame completely and installing a new one directly into the wall cavity. In those situations, the process is more involved, but it ensures durability and long-term performance when the original frame can’t be saved.

Haydon advises homeowners to get advice early so they know what to expect. Having windows assessed up front helps avoid surprises and allows fabricators to plan the work in stages. Some rooms can be done quickly with inserts, while others may need more time if full replacements are required. “Engaging with a fabricator early on just so you can fully understand the process and the product selection is a really important part,” he says.

Bringing character homes up to date

For Haydon, the goal is balance. “We’ve got a huge amount of housing stock which is coming to the end of its sort of usable life in certain regards, windows being one of them.” Insert windows give homeowners a practical way to deal with that reality without stripping away the details that make older houses distinctive. They offer better energy efficiency, fewer draughts and less condensation, while preserving trims, proportions and street appeal.

As he puts it, education is key. The more homeowners understand about their options, the better prepared they are to plan timelines, manage expectations and make confident decisions. And when it comes to character homes, insert windows show that you don’t have to choose between comfort and charm. With the right approach, you can have both.

Disclaimer: This article is based on a podcast featuring insights from experienced professionals and is intended for general information and inspiration only. While we aim to share valuable guidance, please seek personalised advice from qualified professionals before making decisions about your property, finances, or renovation plans.