Skylights in Older Australian Homes: How Easy Are They to Install?

If you own an older home, you probably know the feeling: beautiful character, solid bones, and a few rooms that are just too dark. Hallways, bathrooms, kitchens and internal rooms often rely on artificial light all day. A skylight is one of the most effective ways to fix that, but a common question is: how easy is it to install a skylight in an older house?

The honest answer is that it is very achievable, but it is rarely as simple as in a new build. Older roofs have quirks that need to be understood before anyone picks up a saw. This guide explains what to expect, the problems older houses can throw up, and why modern skylight designs make the job far better than it was a generation ago.

The Short Answer

Installing a skylight in an older home is usually moderately difficult rather than easy. A straightforward installation in a sound roof can often be completed in a day by an experienced roofer or skylight installer. But older homes can add complications such as hidden structural issues, ageing roofing materials, asbestos, heritage restrictions and poor insulation, any of which can add time, cost and planning.

The good news is that every one of these issues is manageable when you know about it upfront. Most problems come from rushed or poorly planned installations, not from the age of the house itself.

Why Skylights Are Worth Considering

Before getting into the challenges, it helps to remember why so many Australian homeowners add skylights in the first place.

• Natural light. A skylight can deliver significantly more daylight than a wall window of the same size, because it faces the open sky.
• Lower lighting costs. Brighter rooms mean less reliance on electric lights during the day.
• Ventilation. Opening skylights allow warm, humid air to escape, which is especially useful in bathrooms, kitchens and laundries.
• Health and comfort. Daylight is linked to better mood and a more pleasant living space.
• Value and appeal. Bright, airy interiors are consistently attractive to buyers.

In older homes, which often have smaller windows, deep floor plans or rooms added over the years, the benefits can be even more noticeable.

Problems Faced with Older Houses

1. Asbestos in Roofing Materials

This is the most important safety issue. Many Australian homes built before the late 1980s used asbestos-cement sheeting in roofs, eaves and ceilings. Cutting, drilling or disturbing this material can release dangerous fibres.

If your home was built before roughly 1990 and you are unsure about its roof materials, do not cut into the roof until the material has been identified. A licensed assessor can test it, and any removal or work involving asbestos must be carried out by appropriately licensed professionals following your state or territory regulations. This is not a DIY situation.

2. Older Roof Framing and Structure

Modern homes typically use prefabricated roof trusses, which are engineered with specific load paths. Many older homes use traditional cut-and-pitch framing, where rafters, purlins and ceiling joists were assembled on site. Every house is slightly different, and the timber may have moved, sagged or been modified over decades.

Installing a skylight usually means interrupting one or more roof members, and that load has to be redirected with properly sized trimmers or headers. In older framing this requires careful assessment, and in some cases input from a structural engineer. Cutting a rafter without proper support can compromise the roof.

3. Ageing or Fragile Roofing Materials

Older roofs may be made from materials that need special handling:

• Terracotta and concrete tiles can become brittle over time, and many individual tiles may need to be lifted and relaid around the opening.
• Slate is beautiful and durable but fragile to walk on, and specialist skills are required.
• Corrugated iron is relatively forgiving, but old fixings and rust around the opening need to be dealt with.
• Old flashings and sarking may be deteriorated, and the installer may need to repair or replace surrounding areas to achieve a watertight result.

Sometimes the skylight project reveals that the surrounding roof needs maintenance anyway. It is often sensible to bundle that work together.

4. Leaks and Poor Flashing Workmanship

Skylights have an unfair reputation for leaking, and in most cases the cause is the installation, not the skylight. Poorly fitted flashings, incorrect pitch for the product chosen, or inadequate sealing can all let water in. Older houses make this harder because the roof surface is rarely perfectly flat or square, so installers must adapt the flashing to suit.

5. Ceiling Construction and Light Shafts

A skylight on the roof is only half the job. The light has to travel down through the roof space and into the room. In older homes the ceiling might be lath and plaster, thick plaster, timber lining boards or ornate cornices, each of which adds complexity. A light shaft or lined tunnel has to be built through the ceiling cavity, and it should be insulated and finished neatly to prevent condensation and heat loss.

6. Heat Gain, Heat Loss and Insulation

Older houses were often built with little or no insulation. Adding an uninsulated or poorly specified skylight to such a home can make a room hotter in summer and colder in winter. Choosing the right glazing is vital, particularly in Australia’s strong sun. Low-E coatings, double glazing and appropriate shading or blinds all help.

7. Heritage Overlays and Council Approval

If your home is heritage listed, or sits within a heritage overlay or conservation area, skylights visible from the street may be restricted or prohibited. Even outside heritage areas, requirements vary between states, territories and councils. Some skylights are exempt from approval, while others require a building permit or planning approval. Check with your local council or a registered building surveyor early.

In bushfire-prone areas, skylights may also need to comply with bushfire attack level (BAL) requirements under AS 3959, which affects the type of glazing and framing allowed.

Why Modern Skylight Designs Are Better

The skylights of the past, often basic acrylic domes or single-glazed units, earned a reputation for overheating rooms, leaking and yellowing over time. Newer designs have improved dramatically.

Better Thermal Performance

Modern skylights commonly use double-glazed, low-emissivity (Low-E) glass, sometimes with argon gas fills. These reduce heat transfer, block a large share of UV and help keep rooms comfortable year-round. Many are rated through the Window Energy Rating Scheme (WERS) in Australia, which makes comparing products easier.

Improved Waterproofing

Purpose-designed flashing kits are now available for different roof profiles, including tile, corrugated metal and flat sheeting. These kits are engineered to work with specific roofing materials, which dramatically reduces leak risk compared with improvised flashing.

Opening and Smart Features

You can now choose fixed, manually opening or electrically operated skylights. Some models are solar powered, so there is no need to run electrical wiring through an older ceiling. Many include rain sensors that close the unit automatically if a shower arrives, and they can be controlled by remote or smart home systems.

Integrated Blinds and Shading

Purpose-made blinds, including solar-reflective and blockout options, are designed to fit specific models. This gives you control over glare and heat in summer.

Tubular Daylighting Options

For homes where a full-size skylight is difficult, tubular skylights use a small roof dome and a reflective tube to carry daylight into the room. They need a much smaller opening, often avoid cutting through major structural members, and are well suited to hallways, walk-in robes and small bathrooms.

Skylight Brands Available in Australia

Several reputable brands supply products in Australia. Availability and models change, so it is worth confirming current ranges with a local supplier or installer.

• VELUX. One of the best-known names, offering fixed, manual and electric opening skylights, including solar-powered models with rain sensors, along with matching flashing kits and blinds.
• FAKRO. A European manufacturer offering a range of roof windows and skylights, including opening and electric options.
• Solatube. A leading name in tubular daylighting systems, ideal for rooms where a standard skylight is impractical.
• Natural Light. An Australian company known for skylights and daylighting products designed for local conditions.

Whichever brand you choose, make sure the product is suitable for your roof type, pitch and climate zone, and that it is installed according to the manufacturer’s specifications. A warranty is only as good as the installation behind it.

What the Installation Process Looks Like

While every job differs, the general process in an older home looks like this:

1. Assessment. The installer inspects the roof, roof space and ceiling, and checks for asbestos, structural issues and the condition of roofing materials.
2. Approvals. Heritage, council and bushfire requirements are checked, and permits are obtained if needed.
3. Product selection. The right size, glazing, opening style and flashing kit are chosen to suit the roof and room.
4. Opening the roof. Roofing material is carefully lifted or cut, and framing is modified and reinforced as required.
5. Fitting and flashing. The skylight is installed and flashed to the manufacturer’s specifications, so it is watertight.
6. Light shaft and ceiling work. The shaft is built, insulated and lined, and the ceiling opening is finished and painted.
7. Final checks. The installer tests operation, checks for leaks and cleans up.

DIY or Professional?

Skylight installation involves working at height, cutting into structural members and creating a waterproof seal on the part of the house that protects everything below it. In older homes, with the added risks of asbestos, fragile materials and unpredictable framing, this is generally a job for a licensed professional. A poor DIY installation can lead to leaks, structural damage, voided warranties and safety risks.

Tips for a Smooth Installation

• Get more than one quote and ask each installer what they will check before starting.
• Ask about experience with your roof type. Tile and slate roofs need specific skills.
• Confirm licensing and insurance. Requirements vary by state and territory.
• Choose the right glazing for your climate and the room’s orientation.
• Plan the light shaft. A well-designed shaft makes a huge difference to both light quality and energy performance.
• Allow for contingencies. Older roofs can reveal surprises once opened up.

Final Thoughts

Installing a skylight in an older house is not necessarily difficult, but it does demand planning, the right product and an experienced installer. Understanding the potential challenges, from asbestos and ageing framing to heritage rules and insulation, puts you in a strong position to avoid costly mistakes.

With modern double-glazed, solar-powered and tubular options now available from brands like VELUX, FAKRO, Solatube and Natural Light, bringing daylight into a dark older home has never been more practical. Done well, a skylight can transform how a room looks, feels and performs for decades.

If you are considering a skylight, start by finding a qualified local roofing professional who can inspect your roof and advise on the best solution for your home. You can browse local roof trades through Roof Trades Australia to get started.

This article is general information only. Building, heritage, asbestos and safety requirements vary by state, territory and council, so always seek advice from licensed professionals before starting work.