BS 5839-1 · Zone charts · System design
Draw it once.
Zone it. Design it.
Trace a floor plan, then turn it into a finished zone chart or lay out a full fire alarm system. Zonex checks detector spacing, call point distances and sounder cover against BS 5839-1 while you work. No CAD needed.
First chart free · then £8.99 a month, everything included
One plan. Every drawing.
- 01
Add the site
Name the site, the address, the system category and the panel type.
- 02
Draw the plan
Upload a plan, snap a photo of a sketch, or draw rooms and doors. Mark it complete to lock it.
- 03
Zone or design
Use the same plan for a zone chart, a system design, or both.
- 04
Print it
Download print-ready SVG, PNG or multi-page PDF with your title block and logo.
New · System designer
Design the whole system.
Checked as you go.
Pick the category (L1 to L5, P1, P2 or M), drop devices onto the plan and watch coverage fill each room. Every issue shows the BS 5839-1 clause next to it.
- Every point within 7.5 m of a smoke detectorCl. 21.2.1
- Heat detectors within 5.3 mCl. 21.2.1
- Detector 300 mm from wall — move to 500 mmCl. 21.2.8
- Call point within 45 m travelCl. 20.2
- Detector on every stair landingCl. 21.1.2
- Zones under 2000 m²Cl. 13.2.2
Device schedule
Counts of every device, floor by floor, ready for quoting and ordering.
Cause & effect
Fill in what each zone triggers: sounders, door release, lifts and more.
Conventional or addressable
Set the panel type and category once per site. Every design follows it.
Zone charts
Charts that go straight on the wall.
Built for fire alarm engineers, not a general drawing tool.
Photo to plan
Snap a hand sketch and Zonex straightens it into a clean plan.
True to scale
Measure one wall and every room gets its real size and area.
Hatched zone key
Each zone gets its own colour and hatch, shared across floors.
Signs & markers
You Are Here signs, fire exits, escape arrows, assembly points.
Multi-floor sites
Every floor, chart and design kept together under one site.
Print-ready
Crisp SVG, PNG and PDF with your logo in the title block.
Studio-quality charts, without the studio software.
Traditional CAD software
- Costly licences and per-seat subscriptions
- Weeks of training to learn the tools
- Fiddly layers, blocks and coordinate systems
- Overkill for a simple zone plan
Zonex
- Free to try — first chart costs nothing
- Learn it in minutes, not months
- Trace, colour and label — that's it
- Zone charts and system design, built on BS 5839-1
One simple monthly price
Start free, then £8.99 a month for unlimited charts. No per-chart or per-floor fees.
Free trial
- Your first zone chart, completely free
- Full editor — floor plans, zones & symbols
- One export, no card required
Zonex membership
- Unlimited zone charts and floors
- Unlimited downloads — one page or per floor
- SVG, PNG & multi-page PDF exports
- Cancel any time
Ready to draw your first zone chart?
Create a professional, compliant fire alarm zone chart today — the first one is on us.
Start free