Your permit may not come from the city: the C-47 and the homes California keeps needing more of

You have set homes for somebody else for years. Piers, anchors, foundation systems, connections, skirting, steps and awnings. You can level a unit, close it up and hand the keys over without asking anyone a question. What you have not done is sign for it.

In California that is one decision rather than two, because the license and the business get built inside the same application: certified experience, two exams, a $25,000 bond, workers compensation and the entity choice all land together. What makes the C-47 different is that you work in two approval worlds at once, and only one of them is the world the rest of California contracting lives in.

The home was approved before it reached your site

Every other trade on this list builds to Title 24. You build the site around a dwelling that was not built to Title 24 at all. A manufactured home is constructed to a federal standard on a factory line, inspected there, and it arrives carrying an insignia that says so. Factory-built and modular units run through the state housing department's own approval program and carry its insignia instead. Either way the local building department does not open the shell and re-inspect what happened in the plant.

Everything from the underside of that floor down is yours, and it is inspected the ordinary way. Which agency does the inspecting depends on where the home sits. Inside a mobilehome park the state housing department is the enforcement agency, unless the local jurisdiction has taken that responsibility on for itself. On private land outside a park you are back with the city or county building department like everybody else.

Then there is the piece of paperwork that is worth more than anything else you do on the site. A manufactured home is titled by the state, like a vehicle, until it is installed on a foundation system and the certificate of that installation is recorded with the county recorder. That recording is what converts the home from personal property into real property. It is the difference between a buyer financing at chattel rates and a buyer financing with a mortgage, and it sits inside your scope. A C-47 who understands the recording sequence and drives it is not selling a set day. They are selling the thing that makes the deal fundable.

Title 24 comes back the moment you build anything beside the home, on the edition fixed by the permit application date. Title 24 and CALGreen for contractors covers how the editions turn over.

What the C-47 signs for, and where it stops

The classifications sit in the 16 CCR 832 family, and the rule underneath all of them is short: work outside the classification you hold is not permitted.

The B question is genuinely live in this trade. A general building contractor taking a prime contract needs at least two unrelated building trades or crafts under BPC s.7057(a). If what you want is a finished lot, the home plus the garage, the driveway and the landscape in one contract with one client, that is a B shape, and plenty of C-47 holders add a B and keep the C-47 for the installation work.

The market moves with the price of a house

This is the classification whose demand curve runs against everybody else's. When site-built housing gets more expensive, the factory-built answer gets more attractive, and California keeps needing dwellings that can be delivered in weeks.

Three streams carry that. Accessory dwelling units on existing residential lots, where a factory unit lands on a foundation instead of a crew framing for six months. Park infill, where an old coach comes out and a new home goes in on the same pad. And replacement housing after a fire, where a family wants to be back on their own land this year rather than in three. Defensible space runs to 100 feet with an ember-resistant zone in the first 5 feet of the structure, and a contractor who prices the skirting, the deck and that first five feet as a compliant package is having a different conversation from one quoting a set fee. Building in a wildfire zone covers the envelope rules.

The fourth stream is public and most C-47 holders never look at it. Relocatable classrooms are commercial modulars, they get set and connected exactly the way a home does, and public school work goes to DSA rather than to the city. Public works over $1,000 are prevailing wage work, you and every listed subcontractor must be registered with DIR to bid with registration renewing July 1, and certified payroll goes in electronically at least monthly. DIR registration and certified payroll is what separates the contractors who can bid a district from the ones who cannot.

Small jobs, the city layer and the $500 line

A C-47 book is not all installations. Releveling, skirting repairs, an awning replacement, new steps, a deck rebuild: half your call log is small residential work for people who live in parks.

Under BPC s.7048 a license is required at and above $500 in combined labor and materials on one undertaking, with the material inside the total. Above that line, residential work is a home improvement contract under the BPC s.7159 family: written, with prescribed headings and type sizes, a three business day right to cancel, change orders signed before the extra work starts, and payments that never run ahead of the value delivered. The down payment is capped at the lesser of $1,000 or 10 percent of the contract price, which on a $9,000 awning and deck package means $900 and on a $78,000 installation means $1,000. Bigger jobs give you proportionally less up front, not more, so the progress schedule is where your cash flow lives. The home improvement contract guide has the required structure.

Then the city layer. A city issues a business tax certificate so it can tax the business, and a crew working three cities in a month needs three of them, each with its own renewal date. That is a filter on your competition rather than a burden. The city business license guide covers what to file.

One installation, five dates

Take a home set on private land, first furnishing on Monday 4 May 2026, completion on Friday 26 June 2026. You signed with the owner, so you are the direct contractor.

The last row is the one that catches installers. A recorded Notice of Completion goes in within 15 days of completion and cuts your window by a month without anyone telephoning you about it. Serve the preliminary notice on every job, because a late one still protects the 20 days before service and everything after. The 20 day preliminary notice guide covers who gets served and the California lien deadline calculator dates all of it from your completion date.

Four years, two exams, and the money to open

Four years of journey-level experience inside the last ten (16 CCR 825), with education creditable for up to three of them, and journey-level counting a journeyman, foreman, supervising employee or contractor. For a C-47 the certification reads best when it covers the whole set: foundation systems and anchoring, utility connections and accessory structures, certified by the contractor or installation supervisor whose jobs you ran. The experience requirement guide covers who can sign.

Then two papers, Law and Business at about 115 questions and the C-47 trade exam at about 100, multiple choice, closed book, at PSI test centers, calibrated per version rather than scored against a published fixed percentage. The exams guide covers both. Then the cash: $450 for the original application, $200 to issue as a sole owner or $350 for any other structure, biennial renewal at $450 or $700 with no continuing education, the $25,000 contractor license bond under BPC s.7071.6 and a further $100,000 employee and worker bond on the LLC route under BPC s.7071.6.5. Workers compensation goes in before anyone else is on the crew, because the license is suspended by operation of law on the day cover lapses, with no warning and no grace. Getting your CSLB license, the bond and the qualifier, workers comp and starting a construction business in California run in order.

Find the pads before somebody calls you

Building permits published by Los Angeles, San Francisco, San Diego and Sacramento show accessory dwelling unit permits as they are pulled, weeks before a homeowner starts calling around. CEQAnet filings surface park developments and larger residential projects at environmental review, long before anyone takes bids. Where work is starting in California covers those sources.

On AEC Stack there is no monthly subscription. The platform fee is 2.5 percent of each invoice processed through the platform, so the contract, the progress schedule and the invoicing earn their keep on the jobs that actually pay.

Take the last home you set for somebody else, put the real hours on the foundation, the connections and the accessory work through the markup and margin calculator, then open a working business file and put the next one in with the recording step scheduled rather than remembered.