Certified audits and tilt sensors for large billboards in Mumbai
TL;DR Mastwise sells outdoor-advertising companies a yearly package for their biggest hoardings - a structural audit signed by a registered engineer, plus tilt and wind sensors that warn before a storm. Mumbai's 2025 hoarding rules make the audit compulsory. The sensors give owners evidence between audits.
On 13 May 2024 a hoarding in Ghatkopar, Mumbai, fell in a dust storm, killing 14 people and injuring more than 74[1]. Mumbai's limit was 40 by 40 feet, and the structure was much bigger than that. Pune's Pimpri Chinchwad had lost five people the year before when an iron hoarding came down in wind[1].
The checking system was weak. A 2017 Bombay High Court judgment on illegal hoardings said nothing about whether structures could withstand wind or bear load, and a lawyer in the case called this a vacuum[1]. After Ghatkopar, neighbouring cities rushed out audit notices, and Navi Mumbai recovered ₹42 lakh from one advertiser who failed to submit a stability certificate[2].
What it does, in regulatory terms: a structural audit service under municipal hoarding rules, plus monitoring that supports, not replaces, the engineer's certificate. The certifying engineer must be registered with the BMC[3].
The seed proposed AI to predict failures across all city infrastructure. That has no single buyer, and nobody can reliably forecast a collapse. So we took one asset class where a new rule creates a repeat purchase - large hoardings.
The engineer inspects foundations, welds and corrosion, checks the design against wind loads and issues the report the BMC asks for. On structures above a size or risk threshold, Mastwise fits wireless tilt sensors and a small wind gauge. If the frame leans past a set limit or a gust crosses a threshold then the owner and Mastwise's engineer get an alert, and the engineer decides whether to take the flex down. Owners see a dashboard per site and a pre-monsoon report.
Outdoor-advertising firms that own or lease hoarding sites pay, and the property owners who host them sometimes share the cost. The new rule makes them carry insurance of ₹5 lakh to ₹1 crore per hoarding[3], so insurers are a second channel. Audit fees today are set privately and aren't published. My assumption on pricing is a per-site annual fee, with a higher tier for sensor sites.
The BMC announced its outdoor advertising policy in November 2025, replacing rules from 2008. It requires a structural stability report for hoardings above 300 sq ft[3], and one trade report says audits are annual[4]. Owners face blacklisting and penalties of twice the fee for violations[4]. Wireless tilt nodes are now sold off the shelf for bridges and rail[5].
I couldn't find a public count of large hoardings in Mumbai, or any figure for audit spending. The narrow anchors are Kalyan-Dombivli with 182 permitted hoardings and Mira-Bhayandar with 166 leased ones plus 57 large private ones[2]. As an adjacent signal, Mumbai took down 32,481 illegal hoardings in one drive reported in 2024[1], which shows the scale of the stock outside the rules.
Private structural engineers do paper audits today. The Ghatkopar hoarding reportedly held such a certificate, which is exactly why a one-off visit is a weak product. A UK sensor maker sells wireless tilt sensors for bridges, slopes and rail[5], so the hardware exists. I found no Indian firm that pairs certified hoarding audits with continuous monitoring, and that's the gap.
| Difficulty | Moderate (46/100) |
| Starting capital | ₹45–85 L |
| Time to launch | 4–6 months |
The engineering is standard. The hard part is trust - your signature carries legal risk, so audits have to be thorough even when clients want a quick stamp. Selling to a fragmented trade, some of it operating on the edge of the rules, also means choosing clients with care.
Yes, this one runs on a municipal rule, and the engineer's registration matters most.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
AI must never sign off a structure as safe. The certificate carries legal risk, and only the registered engineer can give it.
Want to work out the AI layer for Mastwise? Talk to Yash →
This fits a structural engineering firm, or a founder with a licensed engineer as partner, in Mumbai first. Without engineering credentials I wouldn't touch it. Prove first that ten hoarding owners will pay for the sensor tier on top of the audit they have to buy anyway.
Plan for roughly ₹45–85 L, mostly on engineers, sensors and insurance in the first year.
Your certifying engineer must be on the BMC's register to sign stability reports, and radio sensors need WPC approval.
Yes, but only where a rule makes audits compulsory. Check local hoarding and building laws first, because the rule is what creates the repeat purchase.
The free Mastwise validation kit has the line-by-line capital breakdown, the effort scoring, the municipal and engineering checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for hoarding owners and insurers, and 5 assumptions to test. Download the kit →
Thinking about building Mastwise or something close to it? The make-or-break work is pricing liability into each audit and getting owners to pay for monitoring, and I'm happy to help you work that out. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.