Mighty Buildings Junior ADU & Interior Conversion in Burbank: What to Know First
We provide independent Mighty Buildings junior ADU and interior conversion in Burbank, typically completing feasibility through permit-ready drawings in 8-14 weeks and construction in 4-6 months for interior scopes. Every project carries a written price before any work starts, per Haven Standard Clause 1. The number goes on paper first. Everything else follows from that.
This page is for Burbank homeowners who already own or are considering a Mighty Buildings unit and need it adapted into a Junior ADU or interior conversion, not a generic ADU contractor who will learn the system on your job. Call (747) 322-4648 to schedule your free estimate.
How Mighty Buildings Products Fail - and How We Fix Them
- Mighty Buildings M Series panel delamination at utility chase penetrations. The fiber-reinforced polymer skin separates from the foam core where plumbers and electricians rough in conduits, especially in Burbank’s dry heat cycles. We specify chase reinforcement with marine-grade epoxy and add expansion gaps that the factory detail omits, then document the repair in your photo record.
- Mighty Buildings Quattro window buck thermal bridging. The Quattro’s integrated window bucks transfer heat aggressively in Burbank’s summer interior-to-exterior delta, causing condensation and mold at interior conversion boundaries. We install thermal break shims and specify low-e retrofits that maintain the unit’s structural warranty while solving the moisture issue.
- Mighty Buildings B2 floor system deflection under tile loads. The B2’s 8-inch composite floor span reaches L/360 limits when owners add tile in kitchen or bath conversions, causing grout cracking within 18 months. We sister the joist bays with LVL reinforcement during interior conversion, calculated from the actual dead load, not the catalog spec.
- Mighty Buildings M Series HVAC integration gaps. The M Series ships with a dedicated mini-split rough-in, but Burbank’s Title 24 compliance often requires upsizing or adding ERV for Junior ADU occupancy. We coordinate the mechanical redesign with the original panel layout so we don’t cut into structural cells, which voids the panel warranty.
- Mighty Buildings Quattro roof parapet leak at membrane termination. The factory membrane detail fails where Burbank’s Santa Ana wind-driven rain hits the parapet corner. We install a reglet-and-counterflashing detail that the OEM considers aftermarket but that L.A. County’s current wind uplift standard effectively requires for attached ADU configurations.
Our Mighty Buildings Junior ADU & Interior Conversion Process

- 1
Feasibility and zoning check. We pull your Burbank parcel map, verify R-1 or R-2 zoning, and confirm Junior ADU eligibility under Burbank Municipal Code 10-1-507 before you spend money on drawings.
- 2
Site measure and Mighty Buildings serial verification. We record your unit’s serial number, production batch, and any factory modifications, then cross-check against Mighty Buildings’ known service bulletins. This determines whether OEM parts are available or if we specify quality aftermarket equivalents.
- 3
Permit set as core deliverable. Our architectural drafting team produces the full submittal set, including Title 24 energy calculations, structural attachment details for interior conversions, and fire separation where the Junior ADU shares a wall with the primary residence.
- 4
Written price and scope lock. Under Haven Standard Clause 1, you receive a line-item written price before construction begins. Under Clause 5 (No Surprises), that scope is locked at signing.
- 5
Construction with documented photo record. Every visit produces timestamped photos of existing conditions, work in progress, and final state. You receive the full record, not a summary.
- 6
Final inspection and 365-Day Done Right Promise. We walk the inspector together, address punch items immediately, and leave you with a written warranty backed by Haven Standard Clause 9.
Before
AfterWhat Mighty Buildings Junior ADU & Interior Conversion Costs in Burbank
| Scope | Typical Range | What Moves the Price |
|---|---|---|
| Interior room-to-Junior ADU conversion (existing Mighty Buildings shell) | $85,000-$145,000 | Whether the unit already has kitchen rough-in; fire separation requirements; accessibility upgrades |
| Above-garage Mighty Buildings ADU (new install + interior finish) | $195,000-$310,000 | Garage structural reinforcement; crane access in Burbank’s tight hillside lots; utility trenching distance |
| Basement ADU with Mighty Buildings panel infill | $125,000-$220,000 | Excavation depth for Burbank’s expansive clay soils; moisture barrier retrofit; egress window requirements |
| Attached addition ADU (Mighty Buildings module + site tie-in) | $240,000-$380,000 | Foundation type; utility upsizing from LADWP or Burbank Water and Power; roofline integration complexity |
These are real ranges from Ellery ADU Studio Burbank projects, not teaser numbers. Every project is quoted with a written price before any work begins, per Haven Standard Clause 1. Call (747) 322-4648 for your exact estimate - estimates are free.
Why Burbank Homeowners Call Ellery ADU Studio Burbank for Mighty Buildings Work

We are an independent Mighty Buildings service provider, not an authorized dealer, which means we work for the homeowner’s interest, not the manufacturer’s production schedule. Our crew has pulled permits and framed units in Magnolia Park as often as anywhere else in Burbank, so we know which plan checkers flag Mighty Buildings’ standard foundation details and which pass clean.
The 365-Day Done Right Promise is in writing before your project starts, not a verbal assurance after something goes wrong. If the finished Junior ADU is not built to the permitted drawings, we make it right. Our technicians are background-checked and uniformed; our license number appears on every page. And because we also specify Abodu, Cover, and Dvele systems, we can compare Mighty Buildings against real alternatives in the same contract, not in a sales pitch.
FAQs
No. Mighty Buildings’ structural panel warranty covers manufacturing defects, not who performs the interior conversion. We document all modifications with photos and engineering letters so warranty claims on unrelated components remain valid. Call (747) 322-4648 if you have a specific warranty concern - we’ll review your purchase agreement.
We source OEM panels and hardware when Mighty Buildings’ lead time is under 10 weeks, which it usually is for standard M Series and Quattro components. For discontinued B2 elements or when the factory is backordered, we specify structural equivalents with PE-stamped equivalency letters. You see the parts list and the price difference in writing before we order.
If the shell is structurally sound but the interior is unfinished or outdated, conversion is typically the better asset play in Burbank’s rental market. If the panel system has active delamination or the foundation is out of level beyond 1/4 inch in 10 feet, we recommend a structural assessment first. We offer free second opinions on any written estimate you already have.
Interior conversions run 4-6 months from permit issuance to final inspection, assuming Burbank Building and Safety’s current 6-8 week plan check timeline. Attached additions or above-garage installs add 2-4 weeks for crane scheduling and utility coordination. We do not promise same-day or emergency speed on planned construction work; the permit set is the pacing item, and we treat it that way.
No. Under Haven Standard Clause 5 (No Surprises), the scope and price are locked at contract signing. The only changes are owner-initiated upgrades, documented in writing with a change order you approve before the extra work proceeds. No door-side upsells, no scope creep. Call (747) 322-4648 to schedule your free estimate.
Written by Nadia Ellery, Owner, Ellery ADU Studio Burbank at Ellery ADU Studio Burbank, serving Burbank and nearby areas.