As your new accessory dwelling or home addition are being built, you can expect visits from city inspectors. They may ask to see the calculations used to size the interior gas and water lines.
Your plumber and contractor will decide what types of pipes and wiring you need based on projected demand (that is, how much gas and electricity your appliances will use). If the utilities are coming through an existing home on your property, they’ll need to take the existing connections, wiring, and plumbing into account.
The City of San Jose provides its homeowners with a worksheet that can help determine the electrical load of a new structure. While your city will have its own requirements and forms, this is a good resource for calculating your projected electrical load.
Your contractor can use this information to determine the best way to handle electricity in your addition or accessory dwelling. The city may ask for these calculations as part of the permitting process.
To help with planning for gas lines (and anything else that comes up in a construction project), San Jose publishes a guide for homeowners, architects, and contractors called “Construction Guidelines for Residential Construction.” These guidelines are specific to San Jose, but the document provides useful information to anyone building a residence in California. (Ask your city planner’s office for your city’s guidelines.)
In this set of guidelines, pages 85 through 88 provide guidance in choosing the right size of gas piping.
A Reminder: It Won’t Be Easy
In construction, nothing is ever easy.
Requirements vary from city to city (and even from inspector to inspector). While the documents here give you a good idea of what to expect, it’s important to check with your city planner’s office to make sure you have the most up-to-date, local information.
There’s a lot to keep track of when you’re building an addition or accessory dwelling. If you’re not a professional architect or contractor, it helps to have someone on your side who knows the ropes.
Schedule your free consultation with a project manager today and learn how to avoid costly mistakes in planning and construction.