Spend less time working through plans, checking revised drawings and managing certification paperwork.
Spend less time re-checking revised drawings. Building Certifier AI highlights changes between drawing revisions so your team can prepare revised drawings for review faster, and we're building tools to help with the rest of the application pack.
Reports are prepared by our team during early access · AI-assisted preparation — certifier verifies.
The problem
Revised plans shouldn't mean reviewing everything again.
Building certifiers spend valuable time:
Working through architectural plans, engineering drawings and supporting reports
Finding important information across large document packs
Identifying what changed between drawing revisions
Checking whether new information affects previous assessments
Preparing RFIs and chasing outstanding documentation
Repeating administrative work across applications
That time could be spent progressing more certifications.
What it does
What Building Certifier AI does
Drawing revision comparison is available now in early access. The rest is in development.
1. Drawing Revision Comparison
AVAILABLE NOW · EARLY ACCESS
Send us two versions of a drawing and we'll prepare a structured comparison report identifying:
Drawing and revision details
Changed dimensions and annotations
Added or removed notes
Changes requiring closer attention
Side-by-side visual evidence of identified changes
Information that appears unchanged, where it can be reliably established
Coming next: Complete Document Pack Preparation
IN DEVELOPMENT
We're extending the drawing comparison to help certifiers work through complete application packs, including:
Reading architectural, engineering and supporting documents
Organising and summarising the application
Extracting important project information
Identifying potentially missing or inconsistent information
Preparing a job-specific review checklist
Highlighting matters for the certifier to investigate
3. RFIs and Correspondence
IN DEVELOPMENT
A developing workflow capability to assist with preparing requests for additional information, tracking outstanding items and drafting routine project correspondence.
Example
What a comparison looks like
Illustrative sample — invented drawing and invented changes, not a customer project.
Original (Rev A)Revised (Rev B) — changes highlighted
Comparison summaryIllustrative sample · invented data
NEEDS CLOSER ATTENTIONFront setback changed: 1500 mm → 1200 mm. Potentially important change — review against the applicable requirements. Side-by-side crop and difference overlay included in the full report.
NEEDS CLOSER ATTENTIONNew note added, as written on the drawing: “SEWER EASEMENT — AUTHORITY APPROVAL REQUIRED”. Review the revised drawing.
Appears unchanged: lot boundary, building width, Note 3.
AI-assisted preparation — certifier verifies. Prompts for professional review, not compliance conclusions.
Send us two versions of the same drawing — original and revised.
We'll process them and prepare a comparison report.
You'll receive a PDF identifying changes with supporting visual evidence.
Check the findings against your original drawings and tell us whether it saved you time.
Your first two drawing comparisons are free.
Two free reports per business, subject to document suitability. It works best on PDFs exported from CAD; if your set is scanned or image-only, we'll tell you whether it's suitable before we start. We're preparing these by hand during early access, so we'll confirm timing when we reply to your request.
Your drawings remain confidential. They're used only to prepare your comparison report, and we don't publish them or share them with other customers. Please only send drawings you're permitted to share; if in doubt, remove owner names and addresses first.
You email us the PDFs after we reply to your request.
The comparison runs on software we operate. We don't upload your drawings to third-party AI services such as ChatGPT or other hosted AI models.
We use them only to prepare your comparison report.
We keep them for 14 days after we send your report, then delete them.
You can ask us to delete them sooner.
Professional control
Your professional judgement stays in control.
The system assists with document preparation and change identification. It does not issue certification decisions or determine regulatory compliance.
AI-assisted preparation — certifier verifies.
Comparison results may miss changes or include inaccuracies and must be checked against the original documents.
Town planners
Also open to town planning consultancies
If you compare original and amended plans on development applications, you can request the same two free reports — choose “Town planner” in the form below. Results depend on the drawings, and we'll tell you if a set isn't suitable. AI-assisted preparation — planner verifies.
Questions
Common questions
Does it make compliance decisions?
No. It identifies differences between document versions to help you review them. It does not issue certification decisions or determine whether anything complies.
Where does the AI come in?
We used AI to help build the comparison software. The comparison itself is done by that software's own code, not by a chatbot or hosted AI model reading your drawings, so the same two drawings produce the same report every time. It can still miss changes or get things wrong, which is why the certifier verifies.
What do I need to send?
Two PDF versions of the same drawing — the original and the revised one. CAD-exported PDFs work best. We'll confirm whether your set is suitable when we reply.
How long does a report take?
During early access we prepare reports by hand, so we'll confirm timing when we reply to your request. We don't offer instant online processing.
Free reports
Request your 2 free reports
Tell us a little about your business. We'll email you instructions for sending your drawings.