Appendix B evidence.
Sorted.
Builders upload site photos. AI grades every junction instantly. Building Control reviews only what passes. Hours of manual checking, gone.
Free trial — 5 plots · No builder fees · Setup in 2 minutes
Insulation hanging loose, obscuring the wall plate and eaves ventilation path. Move closer and show where the wall insulation meets the roof insulation.
Part L evidence is broken
Builders take the wrong photos. BCOs spend hours checking them. Junctions get boarded over before anyone spots the problem. Everyone loses.
Without AppB
- Unlabelled ZIP files arrive by email
- BCO manually checks 15-20 photos per plot
- Wrong junction? Find out weeks later
- Covered up? Rip it open and re-do
With AppB
- AI grades every photo on upload
- BCO reviews pre-verified evidence
- Wrong junction flagged immediately
- Builder fixes it before cover-up
Three steps. Zero hassle.
From project registration to signed-off evidence in one workflow.
BC creates the project
Register your site, set the plot count, and send the builder an invitation link. Takes two minutes. The builder signs up free — no friction, no fees.
Builder uploads evidence
The builder photographs each Appendix B junction and uploads to AppB. AI identifies the junction, grades the photo, and gives a pass, advisory, or retake verdict in 3 seconds flat.
BC reviews and approves
Your dashboard shows every plot's status at a glance. Drill into any plot, review the AI-verified evidence, and approve with one click. The final report generates automatically.
Built for Building Control
Every feature designed around the BC workflow, not bolted on as an afterthought.
AI junction detection
Upload a photo and the AI identifies which Appendix B junction it shows — 4a eaves, 2c lintel, 1b floor edge. Mismatches flagged instantly.
Instant compliance grading
Pass, advisory, or retake in 3 seconds. Plain English feedback tells the builder exactly what to fix and how.
Plot progress tracking
Visual scorecard for every plot — green, amber, red, grey at a glance. Know exactly what's outstanding before the builder leaves site.
Evidence integrity
SHA-256 content hash, timestamp, and GPS on every photo. Tamper-evident and audit-ready. No more 'when was this taken?'
Professional PDF reports
One-click report generation matching the Appendix B structure. Photos, verdicts, observations, and compliance summary — ready for the file.
Builder invitation system
Send a link, builder signs up free. No app install, no training. They upload photos, you review the results.
Reports that Building Control actually want to receive
Every report follows the Appendix B structure. Photos grouped by junction category, each with the AI verdict, specific observations, and SHA-256 evidence hash. No more unlabelled ZIP files. No more guesswork.
Simple pricing. No builder fees.
Building Control pays per plot. Builders upload for free. Everyone benefits.
- AI grading on all junctions
- PDF report generation
- Builder invitation links
- Full Appendix B coverage
- Everything in Trial
- Approval workflow
- Notification system
- Organisation branding on reports
- Priority support
Stop checking photos.
Start approving plots.
Register your Building Control organisation, create your first project, and let AI do the heavy lifting. Five plots free, no card required.
Register as Building Control Already have an access code from your Building Control? Join a project