These are planning ranges from published trade sources, not Xcel Electrical prices or a guarantee that every job falls within a range. All amounts are in Australian dollars. Your written quote confirms the scope, equipment, labour, exclusions and GST before work starts.
Prices and what they cover
| Work | Planning range | Inclusions and limits |
|---|---|---|
| Hardwired smoke alarm | $165–$275per alarmGST: included after conversion | Standard alarm and wiring installation; interconnection and access affect the final scope. Hardwired smoke alarm: Price source |
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Tell us about the work, your location and the equipment involved.
A practical example
Replacing older hardwired alarms
List the alarms, their manufacture dates and where they connect to other alarms. The $165–$275 per alarm reference 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.
An example scope for planning, not a completed Xcel job or a quotation.
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.
Sources and how to use these figures
We checked the linked published prices on 21 October 2026. Where a source explicitly excludes GST, the figures here add 10%. Where GST is not stated, the table says so. Some references cover NSW generally or a specific Sydney suburb; their scope is identified below. Any rounding is explained with the source. These are sourced ranges, not a statistically measured market average or a maximum price for complex work.
- New Spark Electrical — Sydney electrical job prices — Published excluding GST; amounts below are multiplied by 1.1. Installation scope varies by job.
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.
