Last updated: January 2026
A well-planned garage conversion can add genuine appeal to your home, particularly when the space is upgraded with high-quality aluminium windows and sliding doors that bring in natural light and improve comfort. Across Brisbane and the Sunshine Coast, buyers often look for extra space, and a garage conversion done properly can help the new room feel like a natural extension of the house.
Gallagher Brothers Aluminium has supplied and installed custom aluminium windows, sliding doors and door frames for countless garage conversions over the years. Below, we share what typically adds value, what to consider during planning, and how the right glazing can lift the final result.
Why Garage Conversions Appeal to Buyers
A garage conversion can turn an underused area into a rumpus room, study, home office, guest room, or other additional space. Real estate agents commonly note that buyers respond well to light-filled rooms that are comfortable, functional, and compliant with QLD building requirements.
Where value usually comes from:
- More usable, habitable space
- A wide sliding glass door replacing the old garage door
- Modern aluminium frames that improve security, insulation and durability
View similar projects in the Garage Conversion Portfolio.
Replacing a Garage Door With a Sliding Door
One of the biggest visual and functional improvements in any garage conversion comes from replacing the roller door with a full-height aluminium sliding door or stacker door. Gallagher Brothers custom-fabricate these doors to suit the opening, ensuring a clean, secure, and weather-resistant finish.
Why sliding doors work so well:
- They introduce significant natural light
- Improve airflow
- Make the new room feel connected to the garden or outdoor area
- Offer strong security and long-term durability
Explore available options on the Aluminium Sliding Doors page.
Creating a Comfortable Open Space
Natural Light & Ventilation
Windows and doors play a major role in how inviting a converted garage feels. Popular choices include:
- Sliding windows
- Louvre windows for controlled airflow
- Large sliding doors as the main light source
We often assist homeowners with selecting the best window and door configuration for their available wall space and the direction the existing garage faces.
Energy Efficiency
A frequent concern from homeowners is that converted garages can feel too warm or too cold. Improved glazing helps manage this by reducing draughts and maintaining a more stable temperature inside the new room.
The key factors include:
- High-quality aluminium frames
- Correctly installed glazing
- Appropriate sealing around new openings
Smart Window & Door Placement for Smaller Spaces
Garage conversions are usually compact (often 12–18m²). The right placement of windows and doors can make the room feel larger and more functional.
Common approaches include:
- Wide sliding doors to increase light and visual space
- Tall or full-height windows on the side elevation
- Louvre windows to encourage ventilation
Gallagher Brothers regularly work alongside builders to ensure openings are positioned for the best balance of light, security and practicality.
Costs & What Affects Them
While overall garage conversion cost varies based on the builder’s work, the window and door component is shaped by:
- The size of the opening
- The chosen sliding door or window configuration
- Structural requirements for installation
- Glazing and frame selection
Sliding door installations often deliver the strongest return because they transform both light and usability.
For an accurate quote, contact us.
Planning a Garage Conversion? We Can Help.
The right windows and doors can make a garage conversion feel like a natural part of your home while improving comfort and usability. Gallagher Brothers have helped homeowners across Brisbane transform garage spaces with custom aluminium windows, sliding doors and frames.
If you’re planning a conversion, get in touch for tailored advice or a quote on the best aluminium window and door options for your project.
Frequently Asked Questions
Does converting my garage into a room add value?
Yes! Buyers often value additional, well-lit space, especially when fitted with quality aluminium windows and sliding doors.
What is the best way to bring natural light into a converted garage?
A wide aluminium sliding door paired with well-placed windows delivers the strongest results.
How much does it cost to replace a garage door with a sliding door?
Costs depend on opening size, glazing choice and installation requirements. Gallagher Brothers can provide a tailored quote.
