Your plan reviewers deserve every advantage.
Finish plan review 40% faster on residential plans. Mason marks up plans, cites the building codes, and helps you write your response letter.
Trusted & validated
Trusted by plan review professionals.
Validated by experts.
faster architectural review of Residential projects
AI comments drafted per letter, on average
expert agreement with Mason
CRC, CPC, CEC, CMC, CalGreen & Energy Codes coverage
Prefer to try it yourself first? No card, no sales call.
Free plan reviewThe Problem
Plan review teams lose money when reviews take longer.
Volume is up. Headcount isn't. You get paid the same regardless of how long the review takes.
56% of plan reviewers intend to retire in the next ten years
Codes are getting more complex, right as the industry is losing its most seasoned professionals.
It's harder than ever to recruit new college grads
With fewer students studying civil engineering, ICC certifications are down.
Have questions about how Mason fits your workflow?
Talk to a HumanWhat Mason Does
Catch every fire and life safety issue faster —
by empowering your reviewer with Mason
Finish architectural review 40% faster. Mason marks up plans to flag fire and life safety violations, cites the building codes, and writes comments you can add to your response letter.
- Drafts the first-pass comment letter so reviewers refine instead of starting from a blank page.
- Prioritizes failed checks in the UI, with passed and non-applicable checks one click away.
- Keeps the code inside the product via embedded code books linked to every check.
Want to see the full product?
Watch a Product VideoWhat Mason Changes for Your Team
What changes when your team uses Mason.
Review more plans each week
Sixteen AI-drafted comments per letter, on average — before your reviewer reads the cover sheet.
Free your best people from busy-work.
Senior reviewers get back to judgment work — gray-area violations, local preferences, edge cases, and alternative means and methods.
Always current on the latest codes.
Mason updates with every new CRC, CPC, CEC, CMC, CalGreen, CWUIC, and Energy Codes cycle. Your team never reviews against a stale mental model of the 2022 codes.
Entry-level reviewers get an additional round of QA.
Junior staff backed by Mason catch more, miss less, and get a second pair of eyes on fire and life safety.
More consistency between reviewers.
Ensure response letters are consistent in style, tone, and code citations, and cover all code sections thoroughly.
Want to see this in action on your own plans?
Free plan reviewHow It Works
From upload to comment letter in minutes.
Three steps. No new software stack. No rip-and-replace. Mason fits into your existing review workflow as an AI-powered first pass.
01 · Upload the Plan Set
Drop in the applicant's permit set. Mason's computer-vision model reads the floorplans — walls, doors, windows, fixtures — at 97% accuracy before a human reviewer touches the file.
02 · AI Drafts the First-Pass Comments
Mason checks the full plan against the CRC, CPC, CEC, CMC, CalGreen, CWUIC, and Energy Codes and pre-populates a draft comment letter — every flagged item linked to a clickable code citation.
03 · Your Reviewer Refines and Signs Off
The reviewer reads the draft, applies professional judgment, edits language, adds anything missing, exports a word doc, and sends it to the jurisdiction.
Questions about integrating Mason into your process?
Talk to a HumanAccuracy & Trust
How we earn the right to be in your workflow.
We built Mason knowing that reviewers' reputations depend on what they sign off on.
96% expert agreement
Practicing plan check professionals agree with Mason's code checks 96% of the time.
Continuous evaluation
Half our engineering time goes to tests and synthetic edge cases. We track even a one-inch drift in segmenting a fixture. Accuracy is our core product.
Designed for human oversight
Not a single comment gets added to your response letter without a professional reviewing Mason's reasoning and clicking 'Add to letter'
Ready to put Mason to work for your team?
Get a DemoReviews
Hear from our champions
“Mason is a game-changing tool that's transforming the permit review process by automating some of the most time-consuming tasks.”
“Mason is an excellent tool for design teams to review documents to discover where they may inadvertently be incorporating a code violation.”
“I know with the help of Mason, plan check is going to catch more issues in a fraction of the time, resulting in better, faster, and lower-cost buildings.”
Want to watch the full product overview?
Full VideoStill reviewing every note for 2025 CRC compliance?
There are fifty more notes to check. Or you could just upload the plans.