Case Study: ADU Atlas — a City-by-City California ADU Permit & Cost Navigator
ADU Atlas was a neutral, city-by-city navigator for California accessory dwelling unit (ADU) rules, published on Alumniyat.com — our former product lab, now part of Webmaster & More. Pick a city and it laid out permit fees, realistic cost ranges, expected timelines, and how the latest state law changes affected what your lot could do.
Why city-by-city
California sets the ADU baseline in state law, but the lived experience — fees, review times, local quirks — varies enormously by city. Every homeowner’s first real question is “what does this mean in my city?” Organizing by city rather than by topic matched the tool to the question, the same local-first lesson we kept re-learning across the lab.
How it was built
A static single-page tool with a compiled `data.js` of per-city information, all rendered client-side — no backend, no framework, blueprint-styled design. The heavy lift was research: normalizing dozens of cities’ fee schedules and processes into one comparable structure, and keeping track of the state-law updates that override local rules.
What we learned
Neutrality is a feature in contractor-adjacent spaces. Most ADU content online is published by builders selling ADUs. A tool with no construction contract to sell could say things marketing pages can’t — including “in your city, this probably isn’t worth it.” That credibility is exactly what makes such a tool valuable to a builder, run as an honest resource.
Regulatory content needs versioning. ADU law changes almost yearly. We learned to date-stamp everything and structure data so a law change is a data update, not a rewrite.
Complex decisions want a navigator pattern. Fees → costs → timeline → law changes is a sequence, and walking users through it beats a wall of accordion FAQs.
For contractors, architects, and local pros
If your customers’ first month is spent confused about permits and costs, a navigator like this on your site makes you the guide before you’re the vendor. We build them custom, and we design the data model so your team can keep it current.
Book a free consultation if a permit or cost navigator fits your trade.
Frequently asked questions
What happened to ADU Atlas?
Alumniyat Tools was consolidated into Webmaster & More in July 2026; ADU Atlas was retired and its URL now points to this case study.
Was it selling ADU construction?
No — it was deliberately neutral, which was the point.
Can you build a version for my city or trade?
Yes — the pattern adapts to any permit-heavy service: ADUs, solar, remodels, food service, and more.