Mighty Buildings New Detached ADU Nationwide

Mighty Buildings New Detached ADU: The San Bernardino Owner’s Guide

We stock and install Mighty Buildings-compatible components for new detached ADUs in San Bernardino, with most replacement parts available same-day and installed pricing typically running $2,400-$8,500 depending on the system. Most owners discover a problem when the unit’s climate control cycles unevenly, the smart-home hub throws a connectivity error, or the panelized envelope shows a seal gap after a Santa Ana wind event. Nadia Ellery still uses a finished Mighty Buildings unit three blocks from Seccombe Lake as her reference photo when clients ask what proper assembly looks like.

Call (909) 359-6463

Which Mighty Buildings Models This Applies To

Mighty Buildings produces 3D-printed polymer composite units in the Mighty Mod series (350 sq ft studio, 700 sq ft one-bedroom, and 1,200 sq ft two-bedroom configurations) and the larger Mighty House line. The parts we handle for San Bernardino clients break down into three categories: the proprietary MEP (mechanical, electrical, plumbing) chase modules, the fiber-reinforced thermoplastic wall panels with integrated insulation, and the smart-home control hub that manages HVAC, lighting, and moisture sensing.

To identify your exact part, check the data plate inside the electrical panel door for the serial prefix: MOD-22 and MOD-23 units use the first-generation chase module with 3/4-inch PEX manifolds, while MOD-24 and later ship with the updated 1-inch manifold and revised gasket geometry. The wall panels carry a laser-etched batch code on the interior face near the floor track - we need that code to match thermal expansion coefficients, since San Bernardino’s 110°F summer peaks and 40°F winter lows stress the polymer differently than coastal installs. We are an independent service provider, not affiliated with Mighty Buildings.

OEM parts come direct from Mighty Buildings with a 12-month warranty but 10-14 day lead times. We also source aftermarket equivalents from approved fabricators for the chase modules and gaskets, which cut lead time to 24-48 hours and carry the same 12-month coverage under our install warranty. The smart hub is proprietary - no aftermarket equivalent exists yet.

Signs Your Mighty Buildings New Detached ADU Is Failing

• Uneven heating or cooling between rooms. The zoned mini-split runs but one room stays 8-12 degrees off target. Usually the chase module’s PEX manifold has developed a partial blockage from mineral buildup - San Bernardino’s hard water runs 300-400 ppm calcium, and the narrow passages in early MOD units clog faster than spec.
• Smart hub displays “Panel Comm Error” or drops offline weekly. The moisture sensors embedded in the wall panels lose connection to the hub. The cause is often gasket compression set after thermal cycling; the panel edge deforms enough to break the sensor’s low-voltage contact.
• Visible gap or light leak at wall-to-floor joint. The polymer panel has shrunk or the floor track sealant has aged out. Santa Ana winds pressurize the envelope and accelerate this - we’ve tracked failures to 18-24 months on south-facing walls in San Bernardino’s Devore and Verdemont heights, versus 4+ years in shaded lots.
• Water stain on interior wall with no roof leak above. The chase module’s condensate drain line has cracked at a stress riser. First-generation MOD units used a rigid PVC tee that fails at the glue joint; the updated part switched to flexible couplings.
• HVAC compressor short-cycling (starts, runs 30 seconds, stops). The hub’s temperature averaging algorithm is reading a failed sensor as valid data, causing the system to hunt. Swapping the sensor pair usually fixes it - but the hub firmware must be checked, since early versions didn’t flag sensor drift.

Replacement Cost & What’s Included

Installed pricing in San Bernardino runs as follows, with parts and labor itemized on the written quote before any work starts:

These ranges include removal, disposal, installation, and testing. Under Haven Standard Clause 1, the written price you receive before work starts is the price you pay - no change orders for access complications we could have seen. Our 365-Day Done Right Promise covers both parts and labor; if the chase module leaks at month eight, we return and fix it. Every visit generates a documented photo record, which you receive by email before we leave the site.

DIY or Call Us?

There’s a clear line. An owner can safely power-cycle the smart hub, check the breaker panel, and photograph any error codes or visible gaps - that information saves us 20 minutes on arrival and gets your quote closer to final.

What you should not do: open the chase module cover (240V electrical and pressurized water lines inside), attempt to detach a wall panel (the panel is structural and the seal is part of the thermal envelope - break it and you’ve compromised the unit’s Title 24 compliance), or cut into the condensate line without knowing where the shutoff is. The polymer panels are lightweight but the attachment sequence matters; we’ve seen two San Bernardino owners crack a panel corner by removing screws out of order. If you’re unsure, call (909) 359-6463 and we’ll walk through what you’re seeing. Tell me the lot dimensions and I can give you a real number - not a range so wide it’s useless.

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