11 Things to Know Before Installing a Skylight
A successful skylight project starts long before the roof is opened. Understand the room, roof, product, flashing, shaft, trades and final scope before approving the installation.
- ✓Roof and room suitability
- ✓Fixed, opening and sun tunnel options
- ✓Installation-day preparation
What to confirm before installation begins
These decisions affect the light, comfort, appearance, weatherproofing and final installed cost.
Start with the room—not the product
Define the real objective. A dark hallway may need a sun tunnel, while a kitchen may benefit from a full opening skylight. The room’s use, dimensions, ceiling height and furniture layout should guide the product.
Confirm the roof system
Roof pitch, tile or metal profile, framing, drainage and access determine which skylight and flashing method can be installed. Flat and low-pitch roofs can accept purpose-designed skylights when the correct system is used.
Choose light, ventilation—or both
A fixed skylight provides daylight and a sky view. Manual, solar and electric models can also release warm or humid air. Do not pay for an opening model unless the room will benefit from it.
Do not choose size in isolation
A larger unit may create more light, but it can also increase glare or concentrate light in one area. Room proportion, orientation, shaft shape and spacing should be considered together.
Understand orientation and shade
Morning and afternoon sun behave differently. Nearby trees, neighbouring buildings and roof direction affect light, heat and seasonal performance. There is no single orientation that is automatically best for every room.
Plan the light shaft
Where the ceiling sits below the roof, a shaft connects the skylight to the room. Its depth, width, angle and finish strongly affect how daylight spreads and how the completed installation looks.
Allow for roof-space obstructions
Trusses, rafters, ducts, pipes, wiring, insulation and air-conditioning equipment can limit the location. Some services may need to be relocated before the shaft is closed and plastered.
Compare glazing and light control
Low-E glazing, argon gas and laminated inner panes support comfort and safety. Bedrooms, media rooms and exposed positions may also benefit from a compatible blind.
Check exactly what the quote includes
Confirm product, flashing, roof labour, framing, shaft, plastering, sanding, electrical work, service relocation, rubbish removal and painting. A low price may simply exclude important work.
Prepare the home for installation day
Clear furniture and valuables, protect access paths, provide safe parking and keep children and pets away from the work area. The homeowner should be available to confirm final room positions before cutting begins.
Choose installation experience—not product alone
The skylight, flashing, roof opening and internal shaft operate as one system. Correct installation and roof-specific detailing are as important as the brand printed on the glass.
Use the quote as the project plan
A good quotation should leave very little to guesswork. It should identify the selected solution, included trades, exclusions, payment terms and what the homeowner must complete.
Different rooms need different skylights
Kitchen
Fixed for strong daylight; manual, solar or electric opening when high-level ventilation is also useful.
Bathroom
An opening skylight can add daylight, privacy and natural ventilation. Mechanical exhaust requirements remain separate.
Living and dining
Fixed skylights often provide the best balance of light, visual impact and value. Multiple units can improve distribution.
Bedroom
Consider orientation, early morning light, privacy, ventilation and an optional blind before selecting the size.
Hallway
A sun tunnel is often sufficient for a standard dark hall. A full skylight suits a wide entrance or feature stairwell.
Walk-in robe or pantry
A compact daylight tube can remove daytime darkness without building a full plaster light shaft.
The roof decides the installation system
A skylight should never be selected from internal room measurements alone.
| Roof condition | Typical solution | What must be checked |
|---|---|---|
| Pitched tiled roof | FS, VS, VSS, VSE or roof windows | Roof pitch, tile profile, flashing kit, rafters and shaft location |
| Pitched corrugated metal roof | Pitched-roof VELUX with suitable custom flashing | Sheet profile, back flashing, roof access and drainage path |
| Flat or low-pitch roof | FCM fixed, VCM manual or VCS solar | Minimum pitch, kerb or upstand, custom flashing and water flow |
| Kliplok or concealed-fix roof | Roof-specific custom installation | Sheet layout, clip system, water path and installer experience |
| Cathedral ceiling | Direct-mounted skylight or roof window | Roof pitch, reach, framing and internal lining detail |
| Deep roof cavity | Full shaft or sun tunnel depending on goal | Shaft length, light spread, framing and service obstructions |
What may be included in the complete project?
The opening may need timber framing around rafters or trusses, subject to the roof structure.
The flashing must suit the exact roof material, profile and pitch.
A framed shaft may be required between the roof and ceiling opening.
The internal shaft can be finished ready for the homeowner’s painter.
Electric skylights, switches or nearby services may require a licensed electrician.
Existing services may need to move before the shaft can be closed.
Light-control products should be considered before finishing high or difficult-to-access shafts.
Central Skylights does not include final painting. The plastered shaft is prepared for your painter.
What happens during a typical skylight project?
The exact order depends on the roof, ceiling and number of skylights, but the project commonly follows these stages.
Roof and structural work
Internal finishing
Unsure what is above the ceiling?
A home visit can confirm roof type, framing, likely shaft position, obstructions and suitable VELUX models before installation is booked.
Common mistakes before installing a skylight
The unit may fit the room but not the roof framing, pitch, flashing system or intended shaft.
A lower quote may exclude plastering, structural work, flashing, electrical work or rubbish removal.
Fixed models provide light only. Ventilation requires a suitable manual, solar or electric model.
A bedroom or exposed roof position may need careful sizing, placement or an optional blind.
Flashing is part of the roof weatherproofing system and must match the roof profile and pitch.
The internal shaft can be a major visual feature. Shape, plaster finish and paint affect the final appearance.
Ducts, wiring and plumbing may sit directly above the preferred ceiling position.
Plastering and sanding do not normally mean that final painting is included.
The quote should clearly identify inclusions, exclusions, selected products and homeowner responsibilities.
Ask these before you approve the project
Request the model, size, operating type and roof-specific flashing method.
Confirm whether these trades are included or must be arranged separately.
Ask who coordinates relocation and whether additional costs may apply.
Make sure the finish level and painting responsibility are understood.
This is especially important on corrugated, Trimdek, Kliplok and low-pitch roofs.
Confirm parking, internal clearance, roof access and customer attendance.
Exclusions are often just as important as the listed inclusions.
Ask how the roof opening and internal work will be managed safely.
Homeowner preparation checklist
Clear the room
Move furniture, artwork, electronics and fragile items away from the work area.
Protect access
Keep hallways, driveways and roof-access areas clear for installers and materials.
Plan for dust and noise
Roof cutting, framing and plaster work can create noise and temporary disruption.
Be available
A decision-maker should confirm the final internal position before work begins.
Secure pets and children
Keep them away from ladders, tools and the active work zone.
Confirm service relocations
Arrange electrical, duct or plumbing changes where identified in advance.
Prepare for painting
Plan the final paint colour and painter after the plaster work has been completed.
Review the final scope
Check the model, location, inclusions and exclusions once more before cutting.
Before installing a skylight
Do I need to know which skylight model I want before getting a quote?
No. Room and roof photos can support an initial recommendation, while a home visit can confirm framing, roof profile, suitable locations and product options.
Can skylights be installed on flat or low-pitch roofs?
Yes. Purpose-designed flat and low-pitch models such as VELUX FCM, VCM and VCS can be installed when the roof pitch and flashing or kerb system meet the project requirements.
Should I choose a fixed or opening skylight?
Choose fixed when natural light is the main objective and the room already has suitable ventilation. Choose an opening model when releasing warm or humid air adds useful value.
How large should my skylight be?
The answer depends on room dimensions, roof orientation, ceiling height, shaft depth, glazing and the desired daylight level. Bigger is not always better.
Will the installation damage the ceiling?
A new full skylight usually requires a planned ceiling opening and, where the roof is above a ceiling cavity, a finished light shaft. This is construction work rather than accidental damage.
Does skylight installation include plastering?
It depends on the quotation. Central Skylights can include shaft framing, plastering and sanding. Final painting is not included.
What if there are ducts or pipes above the proposed position?
The location may be adjusted, or the affected service may need relocation before the shaft is closed. Responsibility and possible additional cost should be confirmed in the quote.
Can a skylight be installed in one day?
Some roof installations may be completed quickly, but full projects involving framing, a deep shaft, plastering, service relocation or multiple units can require additional stages. Weather can also affect the schedule.
Do I need a blind?
Not always. Bedrooms, media rooms and roof positions exposed to strong sun are the most likely to benefit from light control.
Is a sun tunnel easier to install than a skylight?
Often, because the openings are smaller and a full plaster shaft is not usually required. However, a long or obstructed tube route can still make the installation more complex.
Should I be home during installation?
Yes, a homeowner or authorised decision-maker should be available at the start to confirm the internal position and answer any unexpected site questions.
What is the most important part of a skylight installation?
The product, roof opening, flashing, drainage, framing and internal shaft must work together. Correct roof-specific installation is just as important as choosing a quality skylight.
Get the room, roof and installation scope right from the beginning
Book a free Melbourne home assessment, send photos for an online quote, or visit the Central Skylights showroom in Noble Park.