Turning a spare bedroom or attached garage into a self-contained living space is one of the most practical investments for a Long Beach lot. Infinity ADU sees conversion projects all the time across neighborhoods like Alamitos Heights and Bixby Knolls, where older homes often have awkward layouts that can be reconfigured. Because you are not pouring a brand-new foundation or framing exterior walls from scratch, a Junior ADU is the most affordable route to adding rental income or family space to your property.
Most homeowners around here land somewhere between $75,000 and $130,000 for a complete JADU build. If you are converting a standard 350-square-foot bedroom suite that already has a decent closet and a connecting door to the main house, you will sit comfortably on the lower end of that range. If you need to gut an attached garage, upgrade an aging electrical panel to 200 amps, and pour a new subfloor to level things out, the cost will be closer to the higher end.
Several clear factors move that needle:
- Kitchen setup: An efficiency kitchen requires a sink, small refrigerator, and a compact cooking appliance, but running new supply and drain lines through existing walls can get tricky.
- Bathroom configuration: JADUs can share a bathroom with the main house under state rules, but building a private en-suite bath adds significant plumbing labor.
- Electrical capacity: Older homes in Craftsman-heavy pockets like Bluff Heights often run on outdated panels that must be replaced before the city signs off.
- Finishes: Opting for custom cabinets versus off-the-shelf boxes makes a major difference in your hardware store totals.
When a contractor hands you a proper quote, it should not just be a mystery lump sum. Infinity ADU breaks down architectural design, engineering, local Long Beach permit fees, rough framing, insulation, drywall, flooring, and all mechanical rough-ins. Make sure your estimate clearly specifies who is buying the appliances and fixtures, because those allowances can hide surprise out-of-pocket expenses later.
To avoid overpaying, always get at least three detailed bids and watch out for lowball numbers that leave out utility tie-ins or city plan-check corrections. Building right here in coastal Southern California means dealing with strict Title 24 energy efficiency rules, so you want a crew that knows how to pass inspections the first time without dragging out the timeline or padding the invoice.