Every mark-up tool you need
Stamps, notes, dimensions, shapes, freehand, measurements, connectors and area take-offs. Point at exactly what you mean, exactly where it matters.
StampsNotesDimensionsShapesFreehandMeasureConnectorsAreas
New: request trade quotes straight from a plan
Mark up plans. Share a link.
Mark up plans. Share a link.
Get sign-off.
CoBuild is the fast, browser-based way for builders and tradies to annotate construction plans, share them with a link, and get formal sign-off. No app to download.
Free to start. No credit card. Works on any device.
CoBuild · Ground-Floor.pdf
No app to downloadOpens in any browser
Any deviceDesk, phone or on site
Sign-off in minutesNot another email chain
Free to startNo credit card needed
How it works
Three steps from PDF to signed off.
01
Upload your plan
Drag in any PDF. It is ready to mark up in seconds, on any device.
02
Mark it up and share
Add stamps, notes, dimensions and layers, then send one link. No login for them.
03
Get sign-off
They approve in the browser. You get a timestamped, tamper-evident record.
Everything on one plan
A full mark-up studio that opens in a browser.
Layers
Organise mark-ups by trade or stage. Share only the layers that matter to each recipient.
Share by link
No app, no login. Clients and trades open the plan in any browser, on any device.
Quotes & trade requests
Turn mark-ups into priced quotes and fire off trade requests without leaving the plan.
Tamper-evident sign-off
A timestamped record of who approved what. The paper trail that protects your margin.
Layers
Keep every trade in its own lane.
Organise mark-ups by trade or stage, then share only the layers each person needs to see. No noise, no confusion about what applies to who.
- Toggle layers on and off as you work
- Share a subset of layers per recipient
- Colour-coded so nothing gets missed
Layers
Architectural
Electrical
Plumbing
Structural
Sign-off
A record you can stand behind.
When a client or trade approves, CoBuild captures a timestamped, tamper-evident record of exactly what they agreed to. The paper trail that protects your margin at handover.
- Timestamped and attributed to a person
- Locked to the exact plan version signed
- Ends the "I never approved that" argument
Approved Ground-Floor.pdf · v3
For builders
Run the job, not the email chain.
- Keep every plan revision in one place, always current
- Hold clients accountable with recorded sign-off
- Protect your margin with a variation paper trail
- Send trade requests and collect quotes off the plan
For tradies
The right plan, in your pocket.
- Get the exact plan on your phone, on site
- See only the layer that applies to your trade
- Mark up precisely what you priced
- Quote straight off the drawing, no callback needed
Pricing
Priced for the trade, not the enterprise.
Solo
For getting your first plan signed off.
$0forever
Start Free - 1 active project
- Core mark-up tools
- Share by link
- Sign-off record
Pro
For the builder or tradie running real jobs.
$29per month
Start Pro - Unlimited projects
- Layers & revisions
- Quotes & trade requests
- Tamper-evident sign-off
- Priority email support
Team
For a crew that shares plans all day.
$79per month
Talk to us - Everything in Pro
- Multiple seats
- Shared contacts
- Roles & permissions
Prices in AUD. No credit card to start. Cancel anytime.
FAQ
Answers, fast.
Everything you need to know before you upload your first plan.
Do my clients or trades need an account?
No. You share a link and they open the plan straight in their browser. No app, no login, nothing to install.
What can I upload?
PDF plans. Drag one in and it is ready to annotate in seconds. You can upload revised versions later and keep all your mark-ups.
Does it work on a phone?
Yes. CoBuild runs in any modern browser, so it works on your desk, your phone on site, or a tablet in the ute.
What does sign-off actually give me?
A timestamped, tamper-evident record of who approved which version of the plan. It is the paper trail that settles disputes and protects your margin at handover.
Can I control who sees what?
Yes. You can share specific pages and specific layers with each recipient, so every trade only sees what applies to them.
How much does it cost?
It is free to start with no credit card. Paid plans begin at $29/month for unlimited projects. See the pricing section above for details.
Get your first plan
signed off today.
Upload a plan, mark it up, and send it for sign-off in the next five minutes. Free to start.