Fire Block Plans in Sydney: What They Are, When You Need One, and What Goes On It

Fire Block Plans in Sydney: What They Are, When You Need One, and What Goes On It

A fire block plan is the diagram mounted at your fire indicator panel that shows arriving Fire and Rescue NSW crews the layout of the building and which alarm zone has activated. If your building has a fire indicator panel or a monitored alarm system, you need one, it has to be oriented the way the brigade approaches the building, and it has to match what is actually on site today rather than what was built ten years ago.

Most people search for this for one of three reasons: a fire safety practitioner or the brigade has pinged the plan as out of date, a new fit-out has changed the zones, or the building is being handed over and the plan was never made in the first place. All three end in the same place, which is a site measure and a new plan.

What a block plan actually does

When a monitored alarm goes off, a truck arrives and someone walks straight to the fire indicator panel. In the minute or two they are standing there, they need to work out where they are in the building, which zone has triggered, and where the water and the isolation points are. The block plan is the only thing at that panel that tells them.

That is why the orientation rule matters so much. The plan is drawn to match the direction the brigade walks in from, not the direction of true north on an architect's drawing. A technically accurate plan that is rotated the wrong way costs time at the worst possible moment.

What has to be on it

Block plans in Australia are prepared to AS 1670.1, the standard covering fire detection, warning, control and intercom system design and installation. The detail varies with the building, but a compliant plan generally shows:

  • The outline of the building and its footprint on the site, including street frontages and access points
  • A north point, with the drawing oriented to the brigade's approach
  • Alarm zone boundaries, numbered to match the alarm zone facility at the panel
  • The location of the fire indicator panel itself and any sub-panels
  • Fire hydrants, the booster assembly and hose reels
  • Sprinkler valves and isolation valves where fitted
  • Gas and electrical isolation points
  • Stairs, lifts, basements and any areas with restricted access
  • Legend and building address

It is printed on rigid, durable material and fixed at the panel where it can be read without moving anything. A curling A4 printout stuck to the wall with tape is not a block plan.

Block plan, evacuation diagram or site plan?

These three get confused constantly, and people often order the wrong one. They are different documents, prepared to different standards, for different readers.

Fire block plan Emergency evacuation diagram Site or zone plan
Who reads it Attending fire brigade Building occupants and visitors Brigade and building staff
Standard AS 1670.1 AS 3745 Varies with the system
Where it goes At the fire indicator panel Throughout the building, at decision points At the panel or booster
Shows Zones, hydrants, boosters, isolation points Your location, exit routes, assembly area Overall site layout, building numbering
When it changes New zones, fit-out, new equipment Layout, exit or occupancy changes Site changes, new buildings

If your building has a fire indicator panel, you almost certainly need both a block plan and emergency evacuation diagrams. One does not substitute for the other.

When a Sydney building needs a new one

The trigger is change. A block plan does not expire on a date, but it stops being compliant the moment it no longer represents the building. Common triggers:

  • A fit-out that splits, merges or renumbers alarm zones
  • New detection added to a previously uncovered area
  • A new booster, hydrant or sprinkler valve installed or relocated
  • The panel itself replaced or moved
  • Walls, tenancies or car park access changed
  • The existing plan has faded, been damaged, or was never drawn to the standard

In NSW, block plans usually come up around the annual fire safety statement. The statement is the yearly certification that each essential fire safety measure in the building still performs to the standard it was installed to. A competent fire safety practitioner inspecting the alarm system will look at the panel, and a plan that does not match the zones is the sort of thing that holds the whole statement up.

How a block plan gets made

There is no shortcut that works. The plan has to reflect the building, so someone has to look at the building.

  1. Site attendance. A measure and walk-through of the site, panel, booster, hydrants and zone coverage. Existing drawings help but are checked against reality, not trusted.
  2. Zone confirmation. The zone numbering and descriptions are taken from the alarm zone facility at the panel so the plan and the panel agree word for word.
  3. Drafting. The plan is drawn to AS 1670.1 and oriented to the brigade approach.
  4. Proof and check. You review it before it goes to print. This is the stage to catch a wrong tenancy name or a booster on the wrong side of the driveway.
  5. Print and install. Printed on rigid stock and mounted at the panel.

For a small, simple building this can be quick. For a multi-level site with a basement, multiple boosters and dozens of zones, the site work is the bulk of the job. Anyone quoting a firm price without knowing how many zones you have and how many levels the building has is guessing. Cost realistically depends on building size, number of zones, how many plans are needed, whether existing drawings are usable, and site access.

What to ask before you engage anyone

  • Will someone attend site, or are they drafting from old plans?
  • Will the plan be drawn to AS 1670.1 and oriented to the brigade approach?
  • Does the zone text on the plan match the alarm zone facility exactly?
  • What material is it printed on, and who mounts it?
  • Do I get a digital copy for my records and for the next update?

That last one matters more than people expect. Holding the source file means the next fit-out costs an amendment rather than a full redraw.

If you are working through the panel documentation, it is worth looking at the rest of the building at the same time. Fire extinguishers and equipment, evacuation diagrams and emergency plans and response procedure manuals all tend to fall due around the same time, and doing them in one site visit is cheaper than three.

FAQ

Does every Sydney building need a block plan?
No. It is tied to having a fire detection and alarm system with a fire indicator panel, typically a monitored system. A small tenancy with extinguishers and exit signs but no panel does not have a block plan. If you are unsure, look for a fire indicator panel near the main entrance or in a dedicated cupboard.

Can I just update the old plan myself?
Not sensibly. The plan has to be to standard, legible, durable and consistent with the panel. Marking up an existing plan by hand creates a document that a fire safety practitioner will not accept and that could mislead a crew arriving at 2am.

Our zones changed but the plan looks close enough. Is that a problem?
Yes. A zone number that points at the wrong part of the building is worse than no plan, because the crew acts on it. Renumbered or resplit zones are the single most common reason a block plan needs replacing after a fit-out.

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