These are our typical Sydney prices for standard jobs, in Australian dollars and including GST. Complex jobs can fall outside them, so your written quote confirms the scope, equipment, labour and exclusions before work starts.
Prices and what they cover
| Work | Typical price (inc. GST) | Inclusions and limits |
|---|---|---|
| Hardwired smoke alarm | $165–$275per alarm | Standard alarm and wiring installation; interconnection and access affect the final scope. |
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Tell us about the work, your location and the equipment involved.
A worked example
Replacing older hardwired alarms
List the alarms, their manufacture dates and where they connect to other alarms. The $165–$275 per alarm price is for a standard alarm installation; a different layout or new interconnection may add wiring work. Ask for a quote based on the required layout, not simply a replacement count copied from the old installation.
What changes the cost?
Existing wiring and interconnection
An existing suitable point can simplify replacement. New wiring or interconnection across rooms changes the installation.
Age and compatibility
Record model numbers and manufacture dates. Replacement alarms and interconnection methods must suit the installation rather than just fit the old mounting plate.
Before you arrange the work
NSW homes and rentals
Homes need working smoke alarms under NSW requirements. Rental responsibilities include checks and prompt repair; consult the current NSW guidance linked below for the precise obligations.
Safety switches do a different job
Smoke alarms detect smoke; safety switches protect against certain electrical faults. Installing one does not replace the need to assess the other.
Check the current NSW smoke alarm guidance and rental smoke alarm responsibilities for your property.
How to use these prices
We last checked these prices on 21 October 2026. They include GST and describe typical jobs; they aren’t an upper limit for complex work. When you compare quotes, check that each one covers the same scope, equipment and exclusions.
For the work included in Xcel’s service, see smoke alarm installation.
Common questions
Can the cheapest battery alarm replace a hardwired alarm?
Do not assume it can. The building requirements and existing installation need to be checked before changing alarm type.
Is one alarm enough for a whole home?
The required layout depends on the building. Ask for an assessment and a quote listing the proposed positions and alarm types.
Does the per-alarm range include an annual rental check?
No. Installation and an ongoing inspection arrangement are different scopes. Specify testing, record keeping and any replacement allowances when comparing rental maintenance quotes.
